Laird BL652 User manual

A
User Guide
BL652 Development Kit
Version 1.4

BL652 Development Kit
User Guide
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REVISION HISTORY
Version
Date
Notes
Approver
1.0
12 Aug 2016
Initial Release
Jonathan Kaye
1.1
19 Aug 2016
Updates to J12 and J6 pins
Raj Khatri
1.2
6 Sept 2016
Updates to nAutorun settings
Raj Khatri
1.3
14 Oct 2016
Updates to JTAG Signals and wiring
Raj Khatri
1.4
15 Nov 2016
Fixes to vSP (Virtual Serial Port) Modes and OTA
(Over the Air) smart BASIC Application Download
section.
Raj Khatri

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CONTENTS
1Overview ..............................................................................................................................................................5
2Laird BL652 Development Kit Part Numbers .......................................................................................................5
3Package Contents.................................................................................................................................................5
4BL652 Development Kit –Main Development Board..........................................................................................6
4.1 Key Features............................................................................................................................................6
5Understanding the Development Board..............................................................................................................8
5.1 BL652 Default Configuration and Jumper Settings.............................................................................. 10
6Functional Blocks .............................................................................................................................................. 11
6.1 Power Supply ....................................................................................................................................... 12
6.1.1 Additional Power Option (for BL652 only) –Coin Cell......................................................... 13
6.2 Reset Button ........................................................................................................................................ 14
6.3 SWD (JTAG) Interface........................................................................................................................... 14
6.4 Four-wire UART Serial Interface .......................................................................................................... 15
6.5 UART Mapping ..................................................................................................................................... 16
6.5.1 UART Interface Driven by USB............................................................................................. 16
6.5.2 UART Interface Driven by External Source .......................................................................... 16
6.6 nAutoRUN Pin and Operating Modes .................................................................................................. 18
6.7 vSP (Virtual Serial Port) Modes and OTA (Over the Air) smart BASIC Application Download............. 19
7Software............................................................................................................................................................ 20
8Breakout Connector Pinouts............................................................................................................................. 21
8.1 J40, J44, J29, J41, J1, J5 SIO (Special Input/Output Sockets) Breakout Connectors ............................ 21
8.2 Arduino Connector for Plugging in an Arduino Shields ....................................................................... 24
8.2.1 Analog Input Buffer and Attenuator Circuit (U3) ................................................................ 26
8.3 Additional Peripherals/Sensors ........................................................................................................... 27
8.3.1 Temperature Sensor............................................................................................................ 27
8.3.2 I2C Sensor (RTC Chip) .......................................................................................................... 28
8.3.3 SPI Device EEPROM ............................................................................................................. 29
8.3.4 Push Button and LED Connected to BL652.......................................................................... 30
8.3.5 NFC External Antenna Connector and NFC Antenna RF Matching Circuit .......................... 31
8.3.6 Optional External Serial SPI Flash IC .................................................................................... 32
8.3.7 Optional 32.76 kHz Crystal .................................................................................................. 33
9Other Features.................................................................................................................................................. 34

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9.1 Current Consumption Measurement................................................................................................... 34
10 Appendix ........................................................................................................................................................... 36
10.1 Coin Cell Insertion................................................................................................................................ 36
10.2 Coin Cell Removal ................................................................................................................................ 36
11 Additional Documentation................................................................................................................................ 37

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1OVERVIEW
The Laird DVK-BL652 development kit provides a platform for rapid wireless connectivity prototyping, providing
multiple options for the development of Bluetooth Low Energy (BLE) plus Near Field Communication (NFC)
applications.
The Laird BLE development kit is designed to support the rapid development of applications and software for
the BL652 series of BLE modules featuring Laird’s innovative event driven programming language – smartBASIC.
More information regarding this product series including a detailed module user’s guide and smartBASIC user
guides are available on Laird’s BL652 product page: http://www.lairdtech.com/products/bl652-ble-module
2LAIRD BL652 DEVELOPMENT KIT PART NUMBERS
Part number: DVK-BL652-SA/DVK-BL652-SC
Applicable to the following BL652 module part numbers:
BL652-SA-xx Bluetooth Smart v4.2 + NFC module –integrated antenna featuring smartBASIC
BL652-SC-xx Bluetooth Smart v4.2 + NFC module –external antenna featuring smartBASIC (FCC)
3PACKAGE CONTENTS
All kits contain the following items:
Development Board
The development board has the required BL652 module soldered onto it and
exposes all available hardware interfaces.
Power Options
USB cable –Type A to micro type B.
The cable also provides serial communications via the FTDI USB –RS232
converter chip on the development board.
DC barrel plug with clips for connection to external power supply (7-12Vdc)
3x AAA battery holder fitted on underside of development board
Coin-cell holder (for powering BL652 module only, not the development
board) fitted on underside of development board
Two-pin jumpers
for pin headers (5)
Five jumpers for 2.54 mm pitch headers used on DVK-BL652 development board.
Fly leads (6)
Supplied to allow simple connection of any BL652 module pin (available on Plated
Though Holes on J29, J40, J41, J44, and headers J5, J36 to any Arduino pin
(available on Plated Though Holes on J15, J16, J22, J23)
External BLE
dipole antenna
External dipole antenna, 2 dBi, 2.4-2.5 GHz (Laird part #0600-00057) with integral
RF coaxial cable with 100 mm length and IPEX-4 compatible RF connector.
NFC antenna
Supplied with the DVK-BL652-SC development board only. Laird NFC flexi-PCB
antenna.
Web link card
Provides links to additional information including the BL652 user guide, firmware,
terminal utilities, schematics, quick start guides, firmware release notes and more.
Note: Sample smartBASIC applications are available to download from the Laird
BL652 applications GitHub webpage

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4BL652 DEVELOPMENT KIT –MAIN DEVELOPMENT BOARD
This section describes the BL652 development board hardware. The BL652 development board is delivered with
the BL652 series module loaded with integrated smartBASIC runtime engine firmware. The development board
comes with a preloaded sample smartBASIC application –$autorun$.devkit.sample.app.sb. This app can be
accessed at the Laird GitHub repository at https://github.com/LairdCP/BL652-Applications. Use the BL652 Quick
Start Guide for additional information. The guide is accessible from the following link:
www.lairdtech.com/BL652-Quick-Start
Note: By default, the module starts running the preloaded development board sample application
($autorun$.devkit.sample.app.sb) at power-up.
Applications in smartBASIC are simple and easy to develop for any BLE application. Sample smartBASIC
applications scripts are available to download from the Laird GitHub repository on the BL652 product page at
https://github.com/LairdCP/BL652-Applications.
The BL652 development board is a universal development tool that highlights the capabilities of the BL652
module. The development kit is supplied in a default configuration which should be suitable for multiple
experimentation options. It also offers a number of header connectors that help isolate on-board sensors and
UART from the BL652 module to create different configurations. This allows you to test different operating
scenarios. The development board also has support for plugging in 3rd party Arduino Shield boards.
The development board allows the BL652 series module to physically connect to a PC via the supplied USB cable
for development purposes. The development board provides USB-to-Virtual COM port conversion through a
FTDI chip –part number FT232R. Any Windows PC (XP or later) should auto-install the necessary drivers; if your
PC cannot locate the drivers, you can download them from http://www.ftdichip.com/Drivers/VCP.htm
4.1 Key Features
The BL652 development board has the following features:
BL652 series module soldered onto the development board
The following power supply options for powering the development board:
–USB (micro-USB, type B)
–External DC supply (7-12V)
–AAA batteries (three AAA battery holder fitted on underside of development board)
Regulated 3.3V for powering the BL652 module. Optional regulated 1.8V for powering the BL652 module
via selection switch
Power supply option for coin-cell (CR2032) operation of the BL652 module ONLY (not development board)
USB to UART bridge (FTDI chip)
BL652 UART can be interfaced to:
–USB (PC) using the USB-UART bridge (FTDI chip)
–External UART source (using IO break-out connectors J1 when the development board is powered
from a DC jack or AAA batteries)
–Arduino connector by use of an analog switch to route the BL652 UART
Current measuring options (BL652 module only):
–Pin header (Ammeter)
–Current shunt monitor IC (volt meter or oscilloscope)
–Series resistor for differential measurement (oscilloscope)

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IO break-out 2.54 mm pitch pin header connectors (plated through-holes) that bring out all interfaces of
the BL652 module –UART, SPI, I2C, SIO [DIO or AIN (ADCs)], PWM, FREQ, NFC –and allow for plugging in
external modules/sensors.
Pin headers jumpers that allow the on-board sensors(I2C sensor, LEDs, Arduino SPI interface, etc.; and the
USB UART FTDI bridge) to be disconnected from BL652 module (by removing jumpers).
Three on-board sensors:
–Analog output temperature sensor
–I2C device (RTC chip)
–SPI device (EEPROM)
Two buttons and two LEDs for user interaction
NFC antenna connector on-board development board for use with supplied flexi-PCB NFC antenna
Optional external 32.768 kHz crystal oscillator. Not required for operation of the BL652; is disconnected by
open solder-bridges by default.
Optional external serial (SPI) flash IC. Not required for operation of the BL652; is disconnected by open
solder-bridges by default.
One analog buffer (provides a 3.3:1 attenuation) used when an analog source is at 5 volts into development
board.
Arduino connectors –Allow for plugging of Arduino shield boards.
Note: The DVK-BL652 development board is not an Arduino shield, but is an Arduino base board (similar to
the Arduino UNO).
Arduino connector test points –All Arduino connector signals brought out to plated through-holes (2.54
mm pitch). Allow any Arduino connector signal (D0-D13 or A0-A5) to be connected to any BL652 module
using fly leads for maximum flexibility
Arduino connector signals wired to BL652 via headers or series resistors
Arduino connectors orientation at 90 degrees to the development board long dimension, allowing larger
Arduino shields to hang off the side of development board so not interfering with the mounted external
antenna or the BL652 module (the BLE chip antenna).
Access to BL652 JTAG –also known as Serial Wire Debug (SWD) Interface
On-board SWD (JTAG) programmer circuitry
smartBASIC runtime engine FW upgrade capability:
–Via UART (using the FTDI USB-UART)
–Via SWD (JTAG) using on-board JTAG programmer circuitry on the DVK-BL652
smartBASIC application upgrade capability:
–Via UART (using the FTDI USB-UART)
–Via OTA (Over-the-Air)

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5UNDERSTANDING THE DEVELOPMENT BOARD
Figure 1: Dev board contents and locations
J13 and J14
NFC Antenna
Connector CON2
J36
Optional Serial
SPI flash
DC Jack
7-12V Input
CON1
Arduino
connecters
PTH Test
Points
J23
J16
Arduino
connecters
J33
J31
Arduino
connecters
J32
J30
Arduino
connectors
PTH Test
Points
J22
J14
SPI
EEPROM
device
USB2 connector
USB-SWD interface
On-board SWD
interface and
programmer
circuitry
J3 and J4
I2C device
U16
TP6 Current
Measurement
output of
Current Shunt
Monitor U7
J29 PTH
FTDI-FT232R
DC/USB
Power
Source
Switch
SW4
Header J12
for nAutoRUN
J35
J1 Header Plated
Through Holes
(PTH) for UART
J6
Temperature
Sensor
TP14 GND
Hook
SW3 nReset
Button
LED2 (J37)
LED1 (J26)
J11 Current
Measurement
J5 (VSP)
Optional
32.768 kHz
Crystal
J41 PTH

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Figure 2: Development board DVK- BL652 (fitted with BL652-SA module for example)

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5.1 BL652 Default Configuration and Jumper Settings
Important! To ensure correct out-of-the-box configuration, the BL652 development board must be set
according to Figure 3.
Figure 3: Correct DVK- BL652 development board jumper and switch settings
J12 Fit Jumper on Pins 2 & 3
SW5 Switch to 3v3
SW6 Switch to 3v3
TP14 Black
Test Hook
J37 Fit Jumper
J26 Fit Jumper
J6 Jumper on
Pins 1 & 2
J7 Fit
Jumper
J13 Fit
Jumper on
pins 2 &3
J14 Fit
Jumper on
pins 2 &3
J3 Fit
Jumper on
pins 1 & 2
J4 Fit
Jumper on
pins 1 & 2
SW4
Switch
to USB

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6FUNCTIONAL BLOCKS
The BL652 development board is formed by the major functional blocks shown in Figure 4.
PSU Block and Current Measurement Block
Figure 4: DVK- BL652 block diagram

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6.1 Power Supply
Figure 5 shows the DVK- BL652 development board Power Supply block.
Figure 5: DVK-BL652 power supply
There are three options for powering the development board:
USB type micro-B connector (USB1)
External DC supply (7-12V), into DC jack connector (CON1),
AAA batteries –Three AAA battery holder (J25) fitted on underside of development board
The power source fed into the DC jack (CON1) (which is then regulated by a DCDC to 5V) or three AAA batteries
(J25) is combined together through diodes (diode-OR) and fed to the selection switch SW4. SW4 selects the
power source between either the USB or the DC jack (5V-regulated)/AAA.
The 5V from the USB or the 5V from DCDC output/AAA batteries is regulated down to 3.3 V with an on-board
regulator (U6) on the development board.
The development board also has a 1.8V regulator allowing for the possibility to power the BL652 module from a
1.8V rail.
Switch SW5 selects between the regulated 3.3V and regulated 1.8V. Default position of SW5 is to select
regulated 3.3V.
Table 1: Dev board power source and switch positions
Development Board Power Source
Switch Positions
SW4
SW5
SW6
USB (USB1)
Position USB
Position 3V3 always
Position 3V3/1V8 always
DC jack (CON1) or AAA battery (J7)
Position DC
Position 3V3 always
Position 3V3/1V8 always
USB (USB2) (Note 1)
Position USB
Position 3V3 always
Position 3V3/1V8 always
Note: The development board DVK-BL652 has on-board circuitry to allow access to BL652 SWD interface (via
USB connector USB2). Use USB2 only to power the development board when BL652 SWD interface is
needed. Refer to SWD Interface. When USB2 is used, USB1 does not need to be used for DC power.

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The CR2032 coin cell voltage is not regulated but is fed directly to the BL652 module supply pin. Switch SW6
selects between the regulated 3V3V/1V8 and coin cell. The coin cell powers only the BL652 module directly (on
the development board); this is power domain VCC_Radio and through R46 provides power to power domain
VCC_IO.
The Arduino connector (J33) receives the following:
7-12V from the DC jack (CON1) directly into the Arduino connector J33 pin 8 (Vin_12V_ARD) via protection
diode (D9) and 1A fuse (F1).
5V is generated from the on-board DCDC regulator (U8) on the development board into the Arduino
connector J33 pin 5 (VCC_5V_ARD). The U8 7-12V input is taken from DC jack (CON1).
3.3V generated from a separate regulator (U9) is used to supply the Arduino connector J33 pin 4, 3.3V
domain only (VCC_3V3_ARD).
On the development board, the power circuity is as follows:
VCC_3V3 –Supplies power to the FTDI chip as well as temperature sensor (U1).
VCC_IO_UART –Supplies the FTDI chip IO and all other sensors and circuitry.
VCC_IO –Supplies the I2C RTC chip (U16). The use case for powering this is: The RTC chip can be configured
so that, after the pre-determined time, the RTC chip outputs (via RTC_ALARM pin) a transition level that
can be used to wake up the BL652 module up from deep sleep.
VCC_Radio –Supplies the BL652 series module only. Current measuring block –the current shunt monitor
IC (U7) –on the development board only measures the current into power domain VCC_Radio (that is
current going into header J7 pin1).
VCC_BLE –supplies the BL652 series module only and is to the current that has come out of the current
measuring block on the development board on header connector J7pin2.
VCC_12V_ARD –Supplies the Arduino connector (J33) only.
VCC_5V_ARD –Supplies the Arduino connector (J33) only and the Analog buffer IC (U3) attenuator circuit.
VCC_3V3_ARD –Supplies the Arduino connector (J33) only.
6.1.1 Additional Power Option (for BL652 only) –Coin Cell
The coin cell powers only the BL652 module directly via SW6 (on the development board –power domain
VCC_Radio) and optionally (through 46, fitted by default) provides power to domain VCC_IO. Jumpers J3 and J4
MUST both be fitted between pins 2 and 3 for coin cell operation of the BL652. Leaving J3 and J4 jumpers fitted
between pins 1 and 2 connects the DVK-BL652 on-board SWD (JTAG) circuitry to the BL652, holding the BL652 in
SWD (JTAG) mode and increasing the current drawn by the BL652 by ~20uA.
Refer to the Appendix for the correct method of coin cell insertion and removal.

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6.2 Reset Button
The development board has a reset button (SW3). The Reset is active low (SW3 pushed down). To view its
location on the board itself, refer to Figure 2.
Figure 6: Reset button schematic and location diagram
6.3 SWD (JTAG) Interface
The development board provides access to the BL652 module two-wire SWD interface on JP1. This is REQUIRED
for customer use, since the BL652 module supports smartBASIC runtime engine firmware over JTAG (as well as
over UART)
Laird recommends you use JTAG (2-wire interface) to handle future BL652 module firmware upgrades. You
MUST wire out the JTAG (2-wire interface) on your host design (four lines should be wired out, namely SWDIO,
SWDCLK, GND and VCC). Firmware upgrades can still be performed over the BL652 UART interface, but this is
slower (60 seconds using UART vs. 10 seconds when using JTAG) than using the BL652 JTAG (2-wire interface).
Upgrading smartBASIC runtime engine firmware or loading smartBASIC applications also can be done using the
UART interface.
For those customers (using Nordic SDK) that require access to BL652 SWD (JTAG) interface, the development
board (DVK-BL652) (see Figure 1) has on-board circuitry to allow access to BL652 module SWD interface (via USB
connector USB2).
Figure 7 shows the SWD on board circuitry routing via J3 and J4 header connectors. When connector USB2 is
used for programming over the SWD (JTAG), J3 and J4 (three-pin headers) jumpers MUST be fitted between pins
1 and 2 for both J3 and J4. This is required to connect the two-wire SWD (JTAG) interface from U14 to the BL652
SWD (JTAG) interface.
C63
NOPOP (0.01uF,16V)
GND
NOPOP (PIN HEADER,2.54mm 1X2P)
J42
11
2
2
GND
R34
150R
nRESET_BLE
Reset
SW3
TACT SW,SMD/180d
1
1
2
233
44
nRESET_BLE
GND

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Figure 7: USB to SWD onboard circuitry routing
Table 2 displays the four signals running from Atmel MCU U14 SWD interface (plus SIO_18 and nReset_BLE) to
the BL652 module SWD interface (plus SIO_18 and nReset_BLE).
Table 2: USB U4 USB-SWD to BL652 SWD signal routing connections
U4 (Atmel MCU) Net
SWD Interface
Route SWD Interface
from U4 to BL652 Module (and pin)
Comments
SWDCLK
SWDCLK_BLE (pin 6)
Fit jumper in J4 pin 2-1 (default)
SWDIO
SWDIO_BLE (pin 5)
Fit jumper in J3 pin 2-1 (default)
nRESET_BLE
nRESET_BLE (pin 7)
Via NOT Fitted (default)series resistor R111
SIO.18
SIO_18 (pin 9)
Via Fitted (default) series resistor R121
SIO_18 is a Trace output (called SWO, Serial Wire Output) and is not necessary for programming BL652 over the
SWD interface.
nReset_BLE is not necessary for programming BL652 over the SWD interface.
6.4 Four-wire UART Serial Interface
The development board provides access to the BL652 module four-wire UART interface (TX, RX, CTS, RTS) either
through USB (via UT10 FTDI USB-UART convertor chip) or through a breakout header connector J1.
Note: The BL652 module provides four-wire UART interface on the HW and the other four signals (DTR, DSR,
DCD, RI), which are low bandwidth signals, can be implemented in a smartBASIC application using any
spare digital SIO pins.
SEGGER J-Link Lite Cortex M-9 JTAG/SWD
Emulator 10-pin connector. Top view.
GND
SWDIO
VCC_IO
SWDCLK
JP1
PIN HEADER,1.27mm 2X5P
1 2
3 4
5 6
7 8
910
PIN HEADER,2.54mm 1X3P
J3
11
22
3
3
J3pin2-1 jumper fitted (Default).
J4pin2-1 jumper fitted (Default).
PIN HEADER,2.54mm 1X3P
J4
11
2
2
3
3
SWDCLK_BLE
nRESET_BLE
SIO_18
SWDIO_BLE

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6.5 UART Mapping
The UART connection on the BL652 series module and the FTDI IC are shown in Table 3. Figure 8 explains how
the BL652 series module UART is mapped to the breakout header connector J1. These connections are listed in
Table 3.
Table 3: SIO/UART connections
BL652 SIO
BL652 Default Function
FTDI IC UART
SIO_6
UART_TX (output)
USB_RX
SIO_8
UART_RX (input)
USB_TX
SIO_5
UART_RTS (output)
USB_CTS
SIO_7
UART_CTS (input)
USB_RTS
Note: Additionally, SIO_13 (the nAutoRUN input pin on the module) can be driven by the USB_DTR output
pin of the FTDI chip. This allows testing the $autorun$ application on boot without setting the autorun
jumper on the development board. Autorun can be controlled directly from Laird’s UWTerminal using
the DTR tick box.
6.5.1 UART Interface Driven by USB
USB Connector: The development kit provides a USB Type Micro-B connector (USB1) which allows
connection to any USB host device. The connector optionally supplies power to the development kit and
the USB signals are connected to a USB-to-serial converter device (FT232R) when SW4 is set to the USB
position.
USB –UART: The development kit is fitted with a (U10) FTDI FT232R USB-to-UART converter which provides
USB-to-Virtual COM port on any Windows PC (XP or later). Upon connection, Windows auto-installs the
required drivers. For more details and driver downloads, visit the following website:
http://www.ftdichip.com/Products/FT232R.htm.
UART Interface Driven by USB FTDI Chip: In normal operation, the BL652 UART interface is driven by the
FTDI FT232R USB-to-UART converter.
6.5.2 UART Interface Driven by External Source
UART Interface Driven by External UART Source: The BL652 module UART interface (TX, RX, CTS, RTS) is
presented at a 2.54 mm (0.1”) pitch header (J1). To allow the BL652 UART interface to be driven from the
breakout header connector (J1), the following must be configured:
–The development board must be powered from a DC jack (CON1) or AAA batteries (J25) and with
switch SW4 in DC position.
–The FTDI device must be held in reset. This is achieved automatically by removal of the USB cable
(from connector USB1), placing SW4 in the DC position or fitting a jumper on J27.
–Fit a jumper on J35 (to switch the Analog switch U15 and route BL652 UART to J1) when connecting an
external UART source (for example FTDI USB-UART TTL (3.3V) converter cable) using J1. This isolates
the BL652 UART from the on-board USB-UART FTDI device. By default, the jumper on J35 is not fitted,
so by default BL652 UART is routed to U10 FTDI FT232R USB –UART converter.
Note: The BL652 UART signal levels always need to match the supply voltage, VCC_Radio, of the
BL652.

BL652 Development Kit
User Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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© Copyright 2016 Laird. All Rights Reserved
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Figure 8: USB to UART interface and header to UART interface
J1 pinout is designed to be used with FTDI USB-UART TTL (3.3V) converter cables (found at
http://www.ftdichip.com/Products/Cables/USBTTLSerial.htm). One example is FTDI part TTL-232R-3V3.
If the BL652 on the development board is powered from 1.8V supply, then the 1.8V version of the FTDI USB-
UART cable would need to be used. UART signal levels always need to match the supply voltage, VCC_Radio, of
the BL652.
Figure 9: J1 wiring to match FTDI USB-UART cable (TTL-232R-3V3 cable)
Fit a jumper in J35 (to switch the Analog switch U15 and route BL652 UART to J1) when connecting an external
FTDI USB-UART TTL (3.3V) converter cable using J1.
Fitting a jumper in J35 also allows the BL652 UART to be routed to Arduino connector (J30).
GND
C8
0.1uF,16V
GND
VCC_IO_UART
VCC_IO_UART
USB_CTS
R8
10K
R6 0R
R9 0R
R12 0R
R21 0R
USB_RX
PIN HEADER,2.54mm 1X2P
J35
1
122
R19
10K
VCC_IO_UART
VCC_IO_UART
Module_RX
D1_TX
Module_CTS
TP11NOPOP (TH_TEST_POINT) 1
SIO_8
VCC_IO_UART
SIO_5
SIO_6
SIO_7
R112
10K
GND
S Channel
Low nY0
High nY1
D0_RX
USB_TX
USB_RTS
TP10NOPOP (TH_TEST_POINT) 1
VCC_IO_UART
Module_RTS U15
AnalogSwitch,Four-pole
1Y0
1
S2
1Y1
15
2Y0
5
2Y1
3
3Y0
9
3Y1
7
4Y0
13
4Y1
11
1Z 16
2Z 4
3Z 8
4Z 12
NC 10
GND 6 VCC
14
Module_TX
VCC_IO_UART
R2
10K
GND
R3
10K
R10
10K
R11
10K
SIO_6
R1
NOPOP (0R)
SIO_7
Module pin BL652 UART Data Flow
SIO_6 Module_TX Output
SIO_8 Module_RX Input
SIO_5 Module_RTS Output
SIO_7 Module_CTS Input
VCC_IO_UART
SIO_8
SIO_5
FTDI (USB to TTL 232 Cable)
GND
RTS
VCC
RX
TX
CTS
GND
USB_CTS
VCC
USB_TX
USB_RX
USB_RTS
J1
NOPOP (PIN HEADER,2.54mm 1X6P)
1
1
2
2
3
3
4
4
5
5
6
6
GND
USB-UART
bridge chip
FTDI
FT232RQ
BL652
module
UART

BL652 Development Kit
User Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
6.6 nAutoRUN Pin and Operating Modes
On the development board, the USB_DTR output (FTDI chip U10) from the PC is wired to BL652 module pin
SIO_13 (pin 28) which is the nAutoRUN pin.
Note: smartBASIC runtime engine FW checks for the status of nAutoRUN during power-up or reset. The
nAutoRUN pin detects if the BL652 module should power up into Interactive/Development Mode (3.3
V) or Self-contained Run mode (0V). The module enters Self-contained Run mode if the nAutoRUN pin
is at 0V and an application called $autorun$ exists in the module’s file system, then the smartBASIC
runtime engine FW executes the smartBASIC application script automatically; hence the name Self-
contained Run mode.
Tying nAutoRUN to 3.3V inhibits the $autorun$ application from running. As an alternative to using USB_DTR,
the J12 three-pin header allows a jumper to be fitted to select between the two operating modes.
Table 4: BL652 nAutoRUN header
nAutoRUN
Pin
BL652 Operating Mode (pin28, nAutoRUN Mode/SIO_13)
Interactive/
Development Mode
(SIO_13 set High Externally)
Self-contained Run Mode
(nAutoRUN mode)
(SIO_13 Low Internally)
Circuit
J12
Jumper
Position
Develop
Jumper on J12 pins 2-1
nAutoRUN (default)
Jumper on J12 pins 2-3
BL652 has internal pull-
down enabled, jumper in
J12 in 2-3 can also be left
off
The J12 header connector allows the USB_DTR signal from the FTDI chip to be disconnected from the BL652.
To connect the BL652 nAutoRUN pin SIO_13 (pin 28) to PC FTDI USB_DTR line via the J12 header connector, do
the following:
Fit the jumper into the J12 (pin 2-1) header connector to allow the PC (using UwTerminal) to control
nAutoRUN pin (SIO_13).
To disconnect the BL652 nAutoRUN SIO_13 (pin 28) from the PC FTDI USB_DTR line, do the following:
Remove the jumper on header connector J12 pin 2-1. Then nAutoRUN can be controlled by inserting the
jumper onto J12 (pin 2-3) as shown in Table 4 (this is the default). The BL652 by default has pull-down
enabled on the SIO_13 (nAutoRUN) pin, so the jumper into J12 (pin 2-3) is optional.

BL652 Development Kit
User Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
19
© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
6.7 vSP (Virtual Serial Port) Modes and OTA (Over the Air) smartBASIC Application
Download
The OTA feature makes it possible to download smartBASIC applications over the air to the BL652. To enable
this feature, SIO_2 must be pulled high externally.
On the development board, header connector J5-pin1 brings out the BL652 SIO_2; J5-pin 2 brings out VCC_IO.
To pull BL652 SIO_2 high (to VCC_IO), fit jumper into header J5.
Note: When SIO_2 is high, ensure that SIO_13 (nAutoRun) is NOT high at same time, otherwise you cannot
load the smartBASIC application script.
This section discusses VSP Command mode through pulling SIO_2 high and nAutoRUN low. Refer to the
documentation tab of the BL652 product page http://www.lairdtech.com/products/bl652-ble-module.
Figure 10 shows the difference between VSP Bridge to UART mode and VSP Command mode and how SIO_02
and nAutoRUN must be configured to select between these two modes.
VSP Bridge to UART mode takes data sent from phone or tablet (over BLE) and sends to BL652 to be sent
out of the BL652 UART (therefore data not stored on BL652).
VSP Command mode takes data sent from phone or tablet and sends to BL652 which will interpret as an AT
command and response will be sent back. The OTA Android or iOS application can be used to download
any smartBASIC application script over the air to the BL652 because a smartBASIC application is
downloaded using AT commands.
Figure 10: Differences between VSP bridge to UART mode and VSP Command mode
Table 5: vSP modes
Mode
SIO_02 and Jumper position J5
nAutoRUN (SIO_13) and Jumper position J12
VSP Bridge to UART
mode
High by fitting jumper in J5
High by fitting jumper in J12 pin 2-1 and untick
DTR box in UwTerminal
VSP Command mode
High by fitting jumper in J5
Low by fitting jumper in J12 pin 2-3 and tick
DTR box in UwTerminal (the DTR box is ticked
by default in UwTerminal)
SIO_02 High (externally) selects the VSP service. When SIO_02 is High and nAutoRUN is Low (externally), this
selects VSP Command mode. When SIO_02 is High and nAutoRUN is High (externally), this selects VSP Bridge to
UART mode.

BL652 Development Kit
User Guide
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
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© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
When SIO_02 on module is set HIGH (externally), VSP is enabled and auto-bridged to UART when connected.
However, for VSP Command mode, auto-bridge to UART is not required. With SIO_02 set to High and nAutoRUN
set to Low, the device enters VSP Command mode and you can then download the smartBASIC application onto
the module over the air from the phone (or tablet).
7SOFTWARE
The development board connects the BL652 module to a virtual COM port of a PC or other device. From a PC,
you can communicate with the module using Laird’s UwTerminal application (version 7.20 or newer for
Windows) or UwTerminalX (a cross platform equivalent of UwTerminal available for Windows, Mac, and Linux).
Both utilities allow connection to serial devices using any combination of the communications parameters listed
in Table 6.
Table 6: UwTerminal/UwTerminalX communication parameters for BL652
Port (Windows)
1 to 255
Port (Mac/Linux)
Any /dev/tty device
(UwTerminalX only)
Baud Rate
1200 to 921,600
Note: Baud rate default is 115200 for BL652.
Parity
None
Data Bits
8
Stop Bits
1
Handshaking
None or CTS/RTS
Note: Baud rates higher than 115200 depend on the COM port capabilities of the host PC and may require
an external USB –RS232 adapter or ExpressCard –RS232 card
The benefits of using UwTerminal/UwTerminalX include the following:
Continually displayed status of DSR, CTS, DCD, and RI
Direct control of DTR on the host PC via a check box
Direct control of RTS, if CTS / RTS Handshaking is disabled when UWTerminal is launched
Sending UART BREAK signals. Following provides explanation UART Break.
(https://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter#Break_condition)
BASIC tab provides standalone testing and development of smartBASIC applications and allows UwTerminal
operation to be automated (UwTerminal only)
Additional built-in features (right click in Terminal tab screen) to accelerate development including
Automation and various XCompile / Load / Run options for downloading smartBASIC applications into the
BL652.
Note: Full details on smartBASIC are available in the smartBASIC User Guide available at the Laird product
page for BL652 (http://www.lairdtech.com/products/bl652-ble-module) along with a document giving
a basic introduction to UwTerminal. A help file is included with UwTerminalX that gives an overview
of the program.