Telit Wireless Solutions BlueMod+S50/AI Installation manual

BlueMod+S50
Hardware User Guide
1VV0301505 Rev. 1 – 2018-03-12

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SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
NOTICE
While reasonable efforts have been made to assure the accuracy of this document, Telit
assumes no liability resulting from any inaccuracies or omissions in this document, or from
use of the information obtained herein. The information in this document has been carefully
checked and is believed to be reliable. However, no responsibility is assumed for
inaccuracies or omissions. Telit reserves the right to make changes to any products
described herein and reserves the right to revise this document and to make changes from
time to time in content hereof with no obligation to notify any person of revisions or changes.
Telit does not assume any liability arising out of the application or use of any product,
software, or circuit described herein; neither does it convey license under its patent rights
or the rights of others.
It is possible that this publication may contain references to, or information about Telit
products (machines and programs), programming, or services that are not announced in
your country. Such references or information must not be construed to mean that Telit
intends to announce such Telit products, programming, or services in your country.
COPYRIGHTS
This instruction manual and the Telit products described in this instruction manual may be,
include or describe copyrighted Telit material, such as computer programs stored in
semiconductor memories or other media. Laws in the Italy and other countries preserve for
Telit and its licensors certain exclusive rights for copyrighted material, including the
exclusive right to copy, reproduce in any form, distribute and make derivative works of the
copyrighted material. Accordingly, any copyrighted material of Telit and its licensors
contained herein or in the Telit products described in this instruction manual may not be
copied, reproduced, distributed, merged or modified in any manner without the express
written permission of Telit. Furthermore, the purchase of Telit products shall not be deemed
to grant either directly or by implication, estoppel, or otherwise, any license under the
copyrights, patents or patent applications of Telit, as arises by operation of law in the sale
of a product.
COMPUTER SOFTWARE COPYRIGHTS
The Telit and 3rd Party supplied Software (SW) products described in this instruction
manual may include copyrighted Telit and other 3rd Party supplied computer programs
stored in semiconductor memories or other media. Laws in the Italy and other countries
preserve for Telit and other 3rd Party supplied SW certain exclusive rights for copyrighted
computer programs, including the exclusive right to copy or reproduce in any form the
copyrighted computer program. Accordingly, any copyrighted Telit or other 3rd Party
supplied SW computer programs contained in the Telit products described in this instruction
manual may not be copied (reverse engineered) or reproduced in any manner without the
express written permission of Telit or the 3rd Party SW supplier. Furthermore, the purchase
of Telit products shall not be deemed to grant either directly or by implication, estoppel, or
otherwise, any license under the copyrights, patents or patent applications of Telit or other
3rd Party supplied SW, except for the normal non-exclusive, royalty free license to use that
arises by operation of law in the sale of a product.

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USAGE AND DISCLOSURE RESTRICTIONS
I. License Agreements
The software described in this document is the property of Telit and its licensors. It is
furnished by express license agreement only and may be used only in accordance with the
terms of such an agreement.
II. Copyrighted Materials
Software and documentation are copyrighted materials. Making unauthorized copies is
prohibited by law. No part of the software or documentation may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language or
computer language, in any form or by any means, without prior written permission of Telit.
III. High Risk Materials
Components, units, or third-party products used in the product described herein are NOT
fault-tolerant and are NOT designed, manufactured, or intended for use as on-line control
equipment in the following hazardous environments requiring fail-safe controls: the
operation of Nuclear Facilities, Aircraft Navigation or Aircraft Communication Systems, Air
Traffic Control, Life Support, or Weapons Systems (High Risk Activities"). Telit and its
supplier(s) specifically disclaim any expressed or implied warranty of fitness for such High
Risk Activities.
IV. Trademarks
TELIT and the Stylized T Logo are registered in Trademark Office. All other product or
service names are the property of their respective owners.
V. Third Party Rights
The software may include Third Party Right software. In this case you agree to comply with
all terms and conditions imposed on you in respect of such separate software. In addition
to Third Party Terms, the disclaimer of warranty and limitation of liability provisions in this
License shall apply to the Third Party Right software.
TELIT HEREBY DISCLAIMS ANY AND ALL WARRANTIES EXPRESS OR IMPLIED
FROM ANY THIRD PARTIES REGARDING ANY SEPARATE FILES, ANY THIRD PARTY
MATERIALS INCLUDED IN THE SOFTWARE, ANY THIRD PARTY MATERIALS FROM
WHICH THE SOFTWARE IS DERIVED (COLLECTIVELY “OTHER CODE”), AND THE
USE OF ANY OR ALL THE OTHER CODE IN CONNECTION WITH THE SOFTWARE,
INCLUDING (WITHOUT LIMITATION) ANY WARRANTIES OF SATISFACTORY
QUALITY OR FITNESS FOR A PARTICULAR PURPOSE.
NO THIRD PARTY LICENSORS OF OTHER CODE SHALL HAVE ANY LIABILITY FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED
AND WHETHER MADE UNDER CONTRACT, TORT OR OTHER LEGAL THEORY,
ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE OTHER CODE
OR THE EXERCISE OF ANY RIGHTS GRANTED UNDER EITHER OR BOTH THIS
LICENSE AND THE LEGAL TERMS APPLICABLE TO ANY SEPARATE FILES, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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

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CONTENTS
1. INTRODUCTION.......................................................................... 7
Scope......................................................................................... 7
Audience.................................................................................... 7
Contact Information, Support...................................................... 7
Text Conventions ....................................................................... 8
Related Documents.................................................................... 8
2. OVERVIEW .................................................................................. 9
3. GENERAL PRODUCT DESCRIPTION ...................................... 10
Feature Summary..................................................................... 10
Applications.............................................................................. 11
Block Diagram.......................................................................... 12
4. APPLICATION INTERFACE...................................................... 13
Power Supply........................................................................... 13
Reset........................................................................................ 14
Serial Interface......................................................................... 15
General Purpose I/O (GPIO) .................................................... 19
I2C Interface ............................................................................. 19
SPI Serial Peripheral Interface ................................................. 19
Serial Wire Debug Interface...................................................... 20
Test Mode................................................................................ 20
NFC Function........................................................................... 21
Slow Clock Interface................................................................. 22
Analog/Digital Converter (ADC)................................................ 23
5. MODULE PINS........................................................................... 24
Pin Numbering.......................................................................... 24
Pin Description......................................................................... 25
Firmware depend Functions..................................................... 26
Handling of Unused Signals ..................................................... 26
6. ELECTRICAL CHARACTERISTICS.......................................... 27
Absolute Maximum Ratings...................................................... 27
Operating Conditions................................................................ 27
DC Parameter .......................................................................... 28
Power Consumption and Power-Down Modes.......................... 29
RF Performance....................................................................... 30

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Antenna-Gain and Radiation Pattern for BlueMod+S50/AI ....... 31
7. MECHANICAL CHARACTERISTICS......................................... 33
Dimensions .............................................................................. 33
Recommended Land Pattern.................................................... 33
Re-flow Temperature-Time Profile............................................ 34
AI Layout and Placement Recommendation............................. 35
OEM Layout and Antenna Selection in Respect to RED/FCC/IC
Certification .............................................................................. 36
Housing Guidelines .................................................................. 38
Safety Guidelines..................................................................... 38
Cleaning................................................................................... 39
8. APPLICATION DIAGRAM.......................................................... 39
9. COMPLIANCES......................................................................... 40
Declaration of Conformity CE ................................................... 40
FCC Compliance...................................................................... 41
IC Compliance.......................................................................... 43
Bluetooth Qualification.............................................................. 45
RoHS Declaration..................................................................... 45
10. PACKING................................................................................... 46
Tape&Reel Packing.................................................................. 46
Tray Packing ............................................................................ 48
Moisture Sensitivity Level......................................................... 48
11. EVALUATION KIT...................................................................... 49
12. SAFETY RECOMMENDATIONS................................................ 50
13. ACRONYMS............................................................................... 51
14. DOCUMENT HISTORY.............................................................. 52

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1. INTRODUCTION
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.
The description text “BlueMod+S50” refers to all modules listed in the
Applicability Table.
Audience
This document is intended for Telit customers, especially system integrators, about to
implement Bluetooth modules in their application.
Contact Information, Support
For general contact, technical support services, technical questions and report
documentation errors contact Telit Technical Support at:
•TS-[email protected]
or your local support center
•[e-mail]
•[e-mail]
•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 feedback from the users of our information.

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Text Conventions
Danger –
This information MUST be followed or catastrophic
equipment failure or bodily injury may occur.
Caution or Warning –
Alerts the user to important points about
integrating the module, if these points are not followed, the module and
end user equipment may fail or malfunction.
Tip or Information –
Provides advice and suggestions that may be
useful when integrating the module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
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, 1VV03xxxxx
•[6] BlueMod+S50 Testmode Reference, 80587NT1xxxxA
•[7] OTA Measurement User Guide, 1VV03xxxxx
•[8] Nordic: nRF52_Series_Reference_Manual
•[9] Nordic: nRF52832_PS v1.x.pdf (Product Specification)

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2. OVERVIEW
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.
The term BlueMod+S50 is used as an abreviation 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.
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
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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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
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 mainlyat devices thatare 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.
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.

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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
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 thegiven 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 in order 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
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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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)
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 1: Pin States during Reset

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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 6.3.1)
•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)
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
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 life time of a coin cell significantly.

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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).
UA RT-TXD
GND
UA RT-RXD
IUC_IN# / CTS#
UA RT-RXD
UA RT-TXD
CTS#
IUC_OUT# / RTS#
IUR_OUT#
IUR_IN#
Figure 6: UART Interface without UICP Signals 4-wire (incl. GND)
UICP has to 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.
It is strongly recommended to use hardware flow control in both
directions. Not using flow control can cause a loss of data.
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).
UA RT-TXD
GND
UA RT-RXD
CTS#
UA RT-RXD
UA RT-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

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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 doesn’t implement UICP, but wake-up BT via GPIO.
UA RT-TXD
GND
UA RT-RXD
IUC_IN# / CTS#
UA RT-RXD
UA RT-TXD
BlueMod+Sx
Host
RTS#
CTS#
IUC_OUT# / RTS#
IUR_OUT#
IUR_IN#BM+Sx-W KU P
Figure 8: Five Wire Interface supporting UICP
4.3.4. Dynamic I/O Signal Type Changes Depending on UICP Status
In order 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 2: Pin Assignments
Signal types I-PD, I-DIS and O-PP may be left open. I-FLOAT has to 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# has to 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.

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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
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)

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General Purpose I/O (GPIO)
Functionality is defined project specific in the firmware used.
It is possible to usethe programmable digital I/OsGPIO[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
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
SPI Serial Peripheral Interface
Functionality is defined project specific in the firmware used.
The serial peripheral interface (SPI) allows for full-duplex, synchronous, serial
communication with external devices. The interface can be configured as the master and
then provides the communication clock (SCK) to the external slave device(s), or as the
slave. The SPI Interface supports SPI-modes 0 through 3. Module pins are used as follows:
•GPIO[2]: SPI-MOSI
•GPIO[5]: SPI-MISO
•GPIO[8]: SPI-SCK
GPIO[8]/SPI-SCK
GPIO[2]/SPI-MOSI
BlueMod+S50
E-2
SPI-Master
connected device
SPI-Slave
GPIO[5]/SPI-MISO
D-1
F-2
SCK, SPI_CLK
SDI, MOSI
SDO, MISO
typical signals:
Figure 12: BlueMod+S50 SPI Interface (Example: Master Mode)

BlueMod+S50 Hardware User Guide
1VV0301505 Rev. 1 Page 20 of 53 2018-03-02
Serial Wire Debug Interface
The Serial Wire Debug (SWD) interface (signals SWDIO, SWCLK) is normally not used in
a customer’s product. It is reserved for debugging purposes.
Leave SWDIO, SWCLK unconnected. Only if you intend to use them for debugging
purposes, make them available.
Test Mode
For regulatory approval purposes, the ability of test mode operation like “BlueMod+S50
Testmode” or “Direct two wire UART Testmode” (DTM) is mandatory. The Direct Test Mode
(as defined by the Bluetooth SIG) and BlueMod+S50 Testmode are part of the
BlueMod+S50 firmware. Please refer to [6] & [7].
For enabling the different test modes the BlueMod+S50 provides two IO pins.
•The pin Testmode is low active. Active means connect to GND.
•The pin Boot0 is high active. Active means connect to VSUP.
•The other two combinations start the bootloader for firmware update of the
programmed firmware. These two modes are not scope of this document.
Table 3 shows the possible combinations:
Testmode#
Boot0
Mode
Active
Inactive
Testmode
Active
Active
DTM
Inactive
Active
Bootloader
I
nactive
Inactive
Firmware
Table 3: Testmode# / Boot0 Logic
To enter and use the test modes, access to the following signals is required:
•BOOT0
•TESTMODE#
•UART-RXD
•UART-TXD
•UART-RTS#
•UART-CTS#
•GND
These pins shall be routed to some test pads on an outer layer, but can be left open during
normal operation when not used.
Please note the UART is required for operation of DTM. For any
regulatory approval, UART-RXD, UART-TXD, UART-RTS# and
UART-CTS# must be freely accessible.