Telit Wireless Solutions BlueMod+S50 User manual

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o
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BlueMod+S50
HW User Guide
1VV0301505 Rev. 3 –2021-05-05
Telit Technical Documentation

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APPLICABILITY TABLE
PRODUCTS
BLUEMOD+S50/AI/CEN
BLUEMOD+S50/AP/CEN

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CONTENTS
APPLICABILITY TABLE 2
CONTENTS 3
1. INTRODUCTION 7
1.1. Scope 7
1.2. Audience 7
1.3. Contact Information, Support 7
1.4. Symbol Conventions 8
1.5. Related Documents 8
2. OVERVIEW 9
3. GENERAL PRODUCT DESCRIPTION 10
3.1. Feature Summary 10
3.2. Applications 11
3.2.1. General Cable Replacement 11
3.2.2. Industry 11
3.2.3. POS/Advertising 11
3.2.4. Healthcare and Medical 11
3.2.5. Sports and Fitness 11
3.2.6. Entertainment 12
3.3. Block Diagram 12
4. APPLICATION INTERFACE 13
4.1. Power Supply 13
4.2. Reset 15
4.3. Serial Interface 16
4.3.1. Basic Serial Interface 16
4.3.2. 4-Wire Serial Interface 17
4.3.3. Serial Interface with UICP 18
4.3.4. Dynamic I/O Signal Type Changes Depending on UICP Status
19
4.3.5. UART Example Circuits 19
4.4. General Purpose I/O (GPIO) 20

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4.5. I2C Interface 20
4.6. SPI Serial Peripheral Interface 21
4.7. Serial Wire Debug Interface 21
4.8. Test Mode 21
4.9. NFC Function 22
4.9.1. NFCT Antenna Recommendations 23
4.9.2. Power Back Feeding 23
4.10. Slow Clock Interface 24
4.10.1. Connection of an External 32,768 kHz Crystal 24
4.11. Analog/Digital Converter (ADC) 25
5. MODULE PINS 27
5.1. Pin Numbering 27
5.2. Pin Description 28
5.3. Firmware depend Functions 29
5.4. Handling of Unused Signals 29
6. ELECTRICAL CHARACTERISTICS 31
6.1. Absolute Maximum Ratings 31
6.2. Operating Conditions 31
6.3. DC Parameter 31
6.3.1. General Purpose I/O (GPIO) 32
6.3.2. Reset 32
6.4. Power Consumption and Power-Down Modes 33
6.4.1. BlueMod+S50/AI CEN FW 33
6.5. RF Performance 34
6.5.1. BLE Receiver 34
6.5.2. BLE Transmitter 34
6.6. Antenna-Gain and Radiation Pattern for BlueMod+S50/AI 35
7. MECHANICAL CHARACTERISTICS 37
7.1. Dimensions 37
7.2. Recommended Land Pattern 37
7.3. Re-flow Temperature-Time Profile 38

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7.4. AI Layout and Placement Recommendation 39
7.5. OEM Layout and Antenna Selection in Respect to RED/FCC/IC Certification
40
7.6. Housing Guidelines 42
7.7. Safety Guidelines 42
7.8. Cleaning 42
8. APPLICATION DIAGRAM 43
9. COMPLIANCES 44
9.1. Declaration of Conformity CE 44
9.2. FCC Compliance 45
9.2.1. FCC Grant 45
9.2.2. FCC Statement 45
9.2.3. FCC Caution 45
9.2.4. FCC Warning 45
9.2.5. FCC RF-exposure Statement 46
9.2.6. FCC Labeling Requirements for the End Product 46
9.3. IC Compliance 46
9.3.1. IC Grant 46
9.3.2. IC Statement 47
9.3.3. IC Caution 47
9.3.4. IC RF-exposure Statement 47
9.3.5. IC Labeling Requirements for the End Product 48
9.3.6. IC Label Information BlueMod+S50 48
9.4. Bluetooth Qualification 48
9.5. RoHS Declaration 49
10. PACKING 50
10.1. Tape&Reel Packing 50
10.1.1. Tape 51
10.1.2. Reel 51
10.2. Tray Packing 52
10.2.1. Module Orientation 52
10.2.2. Tray Dimensions 52

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10.3. Moisture Sensitivity Level 52
11. EVALUATION KIT 53
12. PRODUCT AND SAFETY INFORMATION 54
12.1. Copyrights and Other Notices 54
12.1.1. Copyrights 54
12.1.2. Computer Software Copyrights 54
12.2. Usage and Disclosure Restrictions 55
12.2.1. License Agreements 55
12.2.2. Copyrighted Materials 55
12.2.3. High Risk Materials 55
12.2.4. Trademarks 56
12.2.5. 3rd Party Rights 56
12.2.6. Waiver of Liability 56
12.3. Safety Recommendations 57
13. GLOSSARY 58
14. DOCUMENT HISTORY 59

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1. INTRODUCTION
1.1. Scope
This document provides information how the BlueMod+S50 can be integrated into
customer systems. It addresses hardware specifications of the BlueMod+S50 and
requirements of the hardware environments for the BlueMod+S50.
Note/Tip: The description text “BlueMod+S50” refers to all modules
listed in the Applicability Table.
1.2. Audience
This document is intended for Telit customers, especially system integrators, about to
implement Bluetooth modules in their application.
1.3. Contact Information, Support
For general contact, technical support services, technical questions and report of
documentation errors contact Telit Technical Support at:
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]
• TS[email protected]
Alternatively, use:
https://www.telit.com/contact-us/
For detailed information about where you can buy the Telit modules or for
recommendations on accessories and components visit:
https://www.telit.com
Our aim is to make this guide as helpful as possible. Keep us informed of your comments
and suggestions for improvements.
Telit appreciates the user feedback on our information.

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1.4. Symbol Conventions
Danger: This information MUST be followed or catastrophic
equipment failure or personal injury may occur.
Warning: Alerts the user on important steps about the module
integration.
Note/Tip: Provides advice and suggestions that may be useful when
integrating the module.
Electro-static Discharge: Notifies the user to take proper grounding
precautions before handling the product.
Table 1: Symbol Conventions
All dates are in ISO 8601 format, that is YYYY-MM-DD.
1.5. Related Documents
•[1] Bluetooth SIG Core SpecificationV5.0
•[2] UICP_UART_Interface_Control_Protocol, 30507ST10756A
•[3] BlueMod+S50 AT Command Reference, 80578ST10890A
•[4] BlueMod+S50 Software User Guide, 1VV0301506
•[5] BlueEva+S50 Evaluation Kit User Guide, 1VV0301519
•[6] OTA Measurement User Guide, 1VV03xxxxx
•[7] Nordic: nRF52_Series_Reference_Manual
•[8] Nordic: nRF52832_PS v1.x.pdf (Product Specification)

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2. OVERVIEW
This document provides information on how BlueMod+S50 can be integrated into
customer systems. It addresses hardware specifications of the BlueMod+S50 and
requirements of the hardware environments for the BlueMod+S50.
Note/Tip: The term BlueMod+S50 is used as an abbreviation and
refers to both, the BlueMod+S50/AI and the BlueMod+S50/AP.
If information is related to dedicated versions, the whole product
name is used.
The BlueMod+S50 is delivered in two different hardware versions:
•BlueMod+S50/AI: with integrated Bluetooth antenna
•BlueMod+S50/AP: without integrated Bluetooth antenna and with a 50Ωrf
connection on pin.
Note/Tip: The integration of the BlueMod+S50 Bluetooth module
within user application shall be done according to the design rules
described in this manual.
The information presented in this document is believed to be accurate and reliable.
However, no responsibility is assumed by Telit Communications S.p.A. for its use, nor any
infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent rights of Telit
Communications S.p.A. other than for circuitry embodied in Telit products. This
document is subject to change without notice.

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3. GENERAL PRODUCT DESCRIPTION
3.1. Feature Summary
•Supports Bluetooth low energy
•Qualified Bluetooth V5.0 Single Mode LE
•Supports 2 Msym/s PHY for LE
•Arm® CortexTM-M4F core for embedded profiles or application software
•RF output power -20 up to +4dBm
•RF output power -40dBm in Whisper Mode
•Supply voltage range 1,7V to 3,6V
•Internal crystal oscillator (32 MHz)
•LGA Surface Mount type. BlueMod+S50: 17 x 10 x 2.6 mm3
•Pin compatible to Telit BlueMod family +S, +S42, +S42M and +SR
•Flexible Power Management
•NFC peripheral communication signal interface type A with 106 kbps bit rate
•High-speed UART interface
•I2C Master
•SPI Master/Slave interface
•Up to 19 digital IO’s for individual usage by embedded software
•Up to 8 analog inputs for individual usage by embedded software
•8/9/10/12bit ADC
•Low power comparator
•Real Time Counter
•128-bit AES encryption
•CE certified
•Shielded to be compliant to optional FCC full modular approval
•Manufactured in conformance with RoHS2
•Operating temperature -40 ... +85 °C
•Weight: 0,7 g

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3.2. Applications
The BlueMod+S50 is designed to be used in low power applications, like sensor devices.
Some typical applications are described in this chapter.
Supported profiles are:
•Terminal I/O
•GATT based LE-profiles
Note/Tip: Support for any additional profile is possible on request.
3.2.1. General Cable Replacement
In case there is no standardized application specific profile available the BlueMod+S50
offers Telit’s Terminal I/O profile, which allows transparent data transfer over UART and
supports Secure Simple Pairing, making the pairing process easy and the connection
secure. Terminal I/O is available for iOS and Android as well as implemented in Telit’s
dual mode module BlueMod+SR.
3.2.2. Industry
BlueMod+S50 can be used to monitor and control motors, actuators, values, and entire
processes.
3.2.3. POS/Advertising
BlueMod+S50 supports iBeacon or similar applications.
3.2.4. Healthcare and Medical
Usage of Bluetooth is aimed mainly at devices that are used for monitoring vital data.
Typical devices are blood glucose meter, blood pressure cuffs and pulse ox meters.
Bluetooth BR/EDR and low energy were chosen by the Continua Health Alliance as
transports for interoperable end to end communication.
3.2.5. Sports and Fitness
In the sports and fitness segment the BlueMod+S50 is used in devices for positioning as
well as monitoring vital data. Typical devices in this market are heart rate monitors, body
temperature thermometers, pedometers, cadence meters, altimeter, positioning / GPS
tracking and watches displaying information from sensors.

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3.2.6. Entertainment
Bluetooth technology is already used in a wide variety of devices in the entertainment
sector, namely set-top boxes / gaming consoles. BlueMod+S50 is especially suited for
use in remote controls, gaming controller and wireless mouse/keyboard applications.
3.3. Block Diagram
nRF52832
VSUP
BlueMod+S50/AI
RESET
I2C
UART
SPI
1 2
up to 7
3
GND
3.0V
32MHz
opt. 32kHz
Serial Wire Debug
onboard
antenna
2
GPIO
up to 19
Analog In
up to 6
NFC-Antenna
2
32,768kHz
optional
Figure 1: BlueMod+S50/AI Block Diagram
nRF52832
VSUP
BlueMod+S50/AP
RESET
I2C
UART
SPI
1 2
up to 7
3
GND
3.0V
32MHz
opt. 32kHz
Serial Wire Debug
2
GPIO
up to 19
Analog In
up to 6
NFC-Antenna
2
32,768kHz
optional
BT-Antenna
1
Figure 2: BlueMod+S50/AP Block Diagram

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4. APPLICATION INTERFACE
4.1. Power Supply
BlueMod+S50 require a power supply with the following characteristics:
Typical: 3,0VDC, min.: 1,7VDC, max.: 3,6VDC, thereby delivering > 25 mA peak
BlueMod+S50 is designed to be powered from 3V coin cell batteries e.g. CR2032 directly,
or any other power source complying with the given requirements. For optimal
performance, a stable supply is recommended. Furthermore, it is recommended to place
a capacitor in parallel to the CR2032 3V coin cell battery to prolong battery lifetime, by
compensating the effects of the rising source resistance of the battery to pulsed loads.
Since the isolation resistance of this capacitor will discharge the battery in a not
insignificant scale, the capacitor should be chosen under consideration of the following
rules:
•Capacitance as small as necessary
•Nominal voltage as high as possible
•Case size as large as possible
•Use X7R instead of X5R
.
BlueMod+S50
XC6209F-3.3
E-6,F-6
VSUP
GND:
A-7,E-7,F-7,B-[5:8],
C-[5:8],D-8,E-8,F-8
1µ + 100n
1µ
VOUT
VSS
VIN
CE
5 1
3
2
+5VDC
Figure 3: BlueMod+S50 Example Power Supply with LDO

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It is strongly recommended NOT to switch the module power
supply on/off while other parts of the circuitry stay powered. This
mostly leads to hardly controllable back-feeding issues.
Due to the ultra-low power design a few µAmps are enough to
raise VSUP to an undefined state, which may cause a hang-up
deadlock if power is switched on again.
Any I/O pin at a voltage > 0,3V while the supply VSUP is at 0V
violates the abs. max. ratings given in chapter 5.1 Absolute
Maximum Ratings.
It is instead recommended to use the advanced power
management features, which may reduce the supply current to
300nA.

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4.2. Reset
BlueMod+S50 are equipped with circuitry for generating reset from two sources:
•A reset is held active, when VSUP falls below the threshold of the brownout
detector (VBOR = 1,2V … 1,7V), and is released when VSUP rises above VBOR + VHYST.
The brownout detector also holds the reset active during power up, until VSUP >
VBOR.
•A reset is generated, when VSUP is > VBOR and increases 300 mV or more, within
300 ms or less.
•By holding pin B-1 (EXT-RES#) at ≤VSUP*0,25V for tHOLDRESETNORMAL ≥0,2µs, an
external reset ( pin reset ) is generated. This pin has a fixed internal pull-up
resistor (RPU = 11kΩ... 16kΩ). EXT-RES# may be left open if not used.
BlueMod+S50
E-6,F-6
VSUP
GND
+3V3
EXT-RES# B-1
Reset-Switch is optional
Please Note: EXT-RES# of BlueMod+S50 has approx. 13k internal pullup.
Reset signal is optional
Host MCU
GPIO
VDD
Figure 4: BlueMod+S50 Example Reset
The following table shows the pin states of BlueMod+S50 during reset active. This pin
states are kept until hardware initialization has started.
Pin Name
State: BlueMod+S50
EXT-RES#
Input with pull-up (1)
XL-IN
Input floating (disconnected)
XL-OUT
Input floating (disconnected)
UART-TXD
Input floating (disconnected)
UART-RXD
Input floating (disconnected)
UART-RTS#
Input floating (disconnected) with pull-up resistor 470kΩ(2)
UART-CTS#
Input floating (disconnected)
IUR-OUT#
Input floating (disconnected)
IUR-IN#
Input floating (disconnected)
GPIO[0:14]
Input floating (disconnected)

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Pin Name
State: BlueMod+S50
TESTMODE#
Input floating (disconnected)
BOOT0
Input floating (disconnected)
SWDIO
Input with pull-up (1)
SWCLK
Input with pull-down (1)
(1) pull-up, pull-down: RPU, RPD is typ. 10kΩ
Table 2: Pin States during Reset
4.3. Serial Interface
The serial interface of BlueMod+S50 is a high-speed UART interface supporting RTS/CTS
flow control and interface-up/down mechanism according to the UICP protocol (refer to
[2]).
•Electrical interfacing is at CMOS levels (defined by VSUP; see chapter 0)
•Transmission speeds are 9600 –921600 bps and 1Mbps (asynchronous)
•Character representation: 8 Bit, no parity, 1 stop bit (8N1)
•Hardware flow-control with RTS and CTS (active low)
Note/Tip: Transmission speed may be limited by firmware. See
corresponding AT command reference [3] for further information.
4.3.1. Basic Serial Interface
The basic serial interface (with RTS/CTS flow control) uses only four signal lines (UART-
RXD, UART-TXD, UART-CTS#, UART-RTS#) and GND. IUR-IN# and IUR-OUT# (see below)
can be left unconnected.
BlueMod+S50
Host
UART-RXD
UART-TXD
UART-CTS#
UART-RTS#
GND
Figure 5: Basic Serial Interface

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Warning: A pulldown resistor is programmed to CTS# if UICP is
disabled.
If AT+SYSTEMOFF is issued while UICP is disabled, it is necessary
that the host keeps CTS# at logic low or leaves this pin floating.
Otherwise the supply current drawn in the deep sleep mode
increases by VSUP/13kΩ, which would be at 3V 231µA, 770 times the
expected 0,3µA. This would reduce the lifetime of a coin cell
significantly.
4.3.2. 4-Wire Serial Interface
If the host in question is sufficiently fast, a four-wire scheme may be successful. Connect
the serial lines UART-RXD, UART-TXD as well as UART-RTS# and GND; leave UART-
CTS# open. The host is required to stop sending data within a short time after de-
assertion of UART-RTS# (there is room for up to 4 more characters at the time RTS#
drops).
UART-TXD
GND
UART-RXD
IUC_IN# / CTS#
UART-RXD
UART-TXD
CTS#
IUC_OUT# / RTS#
IUR_OUT#
IUR_IN#
Figure 6: UART Interface without UICP Signals 4-wire (incl. GND)
Warning: UICP must be deactivated permanently in this
configuration, because signal UART-CTS# and IUR-IN# become
inputs with no PU or PD if UICP is active. This would cause floating
CMOS inputs.
Note/Tip: It is strongly recommended to use hardware flow control in
both directions. Not using flow control can cause a loss of data.

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4.3.3. Serial Interface with UICP
A substantially saving of power during idle phases can be achieved (see when the UICP
protocol is used (refer to [2]). This protocol should be implemented on the host side as
well. Signals IUR-IN# and IUR-OUT# should be connected to the host and may be mapped
to DSR and DTR, if an RS232-style (DTE-type) interface is used (see Figure 7).
UART-TXD
GND
UART-RXD
CTS#
UART-RXD
UART-TXD
BlueMod+Sx
Host
RTS#
CTS#
RTS#
IUR_OUT#
IUR_IN# IUR_OUT# / DTS
IUR_IN# / DTR
Figure 7: BlueMod+S50 Serial Interface Supporting UICP
If I/O line availability at the host side is extremely tight, 2 I/O lines could be saved by using
the following scheme. This would come at the cost of:
•The host is not allowed to enter sleep mode.
•The host must accept incoming data at all times and is not able to stop the
BlueMod+Sx sending data. This may be difficult to control for all scenarios and
adds the risk that data gets lost.
•The host does not implement UICP, but wake-up BT via GPIO.
UART-TXD
GND
UART-RXD
IUC_IN# / CTS#
UART-RXD
UART-TXD
BlueMod+Sx
Host
RTS#
CTS#
IUC_OUT# / RTS#
IUR_OUT#
IUR_IN#BM+Sx-WKUP
Figure 8: Five Wire Interface Supporting UICP

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4.3.4. Dynamic I/O Signal Type Changes Depending on UICP Status
To reduce current consumption when using UICP, the BlueMod+S50 FW supports the
following dynamic I/O signal type changes depending on the UICP activated resp.
deactivated status.
Signal
UICP deactivated
UICP activated
UART-CTS#
I-PD
I-FLOAT
IUR-IN#
I-DIS
I-FLOAT
IUR-OUT#
I-DIS
O-PP
(1) I-PU: input pull-up; I-PD: input pull-down; I-FLOAT: input floating; I-DIS: input disconnected; O-PP: output push-pull
Table 3: Pin Assignments
Signal types I-PD, I-DIS, and O-PP may be left open. I-FLOAT must be driven to GND or
VCC to avoid open CMOS input oscillation.
If UICP is deactivated the pull-down resistor on UART-CTS# helps to keep the serial
interface active if UART-CTS# is open.
If UICP is active and the serial interface is down, UART-CTS# must be held at VCC and
thus the pull-down would cause an unwanted permanent current drain. Therefore, the
pull-down is switched off in this mode.
4.3.5. UART Example Circuits
2
BlueMod+S50
GND
MAX3241
14
+3V3
22
23
2
3
7
8
4
6
1
9
TXD
RXD
RTS#
CTS#
IUR-OUT#
IUR-IN#
TXD
RXD
RTS
CTS
DTR
DSR
DCD
RI
RS232
DSUB9 (male)
DTE style connector pinout
9
4
10
5
11
6
7
8
19
13
18
12
17
16
15
F-4
D-2
D-7
F-3
B-4
D-5
UART_TXD
UART_RXD
UART_RTS#
UART_CTS#
IUR-OUT#
IUR-IN#
SHDN#
EN#
100n
100n
28
24
1
+3V3
100n 100n 100n
26
3
27
25
V+
VCC
V -
GND
C2+
C2-
C1+
C1-
220R
220R
220R
220R
220R
220R
5
SigGND
can be left open
VSUP
+3V3
Figure 9: BlueMod+S50 Serial Interface (RS-232 COM Port) Supporting UICP

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VDDIO
(+1.2V .. +3.6V)
BlueMod+S50
GND
D-2
F-4
F-3
D-7
UART_RXD
UART_TXD
UART_CTS#
UART_RTS#
10µ+100n+1n
SN74AVC4T245
User Host System
VSUP
XC6209F-3.3
VOUT
VSS
VIN
CE
1µ
100k
100k
VCCB
1B1
1B2
2B1
2B2 2A2
2A1
1A2
1A1
VCCA
1DIR
1OE
2DIR
2OE
(GPIO, Out,
no pu/pd)
(GPIO, Out,
no pu/pd)
TXD
RTS#
RXD
CTS#
+5VDC
OE_DRV#
BT_ENABLE
VDD_HOST (+1.2 .. +3.6V)
+3V3_switched
Figure 10: BlueMod+S50 Example Serial Interface (Mixed Signal Level)
4.4. General Purpose I/O (GPIO)
Functionality is defined project specific in the firmware used.
It is possible to use the programmable digital I/Os GPIO[0:14] on the BlueMod+S50.
Unused GPIO pins shall be left unconnected to stay compatible. There may be functions
assigned to some in future versions of the firmware. Refer to 5.3
4.5. I2C Interface
Functionality is defined project specific in the firmware used.
The I2C bus interface serves as an interface between the internal microcontroller and the
serial I2C bus. BlueMod+S50 is the master and controls all I2C bus specific sequencing,
protocol, and timing. It supports standard (100kHz) and fast (400kHz) speed modes. The
BlueMod+S50 as an I2C master must be the only master of the I2C bus (no multimaster
capability). Clock stretching is supported.
SDA and SCL can be used to form an I2C interface. It is required to connect 4k7 pull-up
resistors on SCL and SDA when this interface is used.
I2C-SCL
I2C-SDA
GPIO[0]/I2C-SCL
GPIO[1]/I2C-SDA
BlueMod+S50
Rpu
VSUP
B-2
D-3
Rpu
VSUP
4k7
4k7
Figure 11: BlueMod+S50 I2C Interface