A
User Guide
BL652 Development Kit
Version 1.4
BL652 Development Kit
User Guide
REVISION HISTORY
Version
1.0
1.1
1.2
1.3
Date
12 Aug 2016
19 Aug 2016
6 Sept 2016
14 Oct 2016
1.4
15 Nov 2016
Notes
Initial Release
Updates to J12 and J6 pins
Updates to nAutorun settings
Updates to JTAG Signals and wiring
Fixes to vSP (Virtual Serial Port) Modes and OTA
(Over the Air) smart BASIC Application Download
section.
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Approver
Jonathan Kaye
Raj Khatri
Raj Khatri
Raj Khatri
Raj Khatri
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BL652 Development Kit
User Guide
CONTENTS
1
Overview ..............................................................................................................................................................5
2
Laird BL652 Development Kit Part Numbers .......................................................................................................5
3
Package Contents.................................................................................................................................................5
4
BL652 Development Kit – Main Development Board ..........................................................................................6
4.1
5
Understanding the Development Board ..............................................................................................................8
5.1
6
Key Features............................................................................................................................................6
BL652 Default Configuration and Jumper Settings .............................................................................. 10
Functional 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
7
Software ............................................................................................................................................................ 20
8
Breakout 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
8.3
9
Analog Input Buffer and Attenuator Circuit (U3) ................................................................ 26
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
Other Features .................................................................................................................................................. 34
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User Guide
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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BL652 Development Kit
User Guide
1 OVERVIEW
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
2 LAIRD BL652 DEVELOPMENT KIT PART NUMBERS
Part number:
DVK-BL652-SA/DVK-BL652-SC
Applicable to the following BL652 module part numbers:
BL652-SA-xx
BL652-SC-xx
Bluetooth Smart v4.2 + NFC module – integrated antenna featuring smartBASIC
Bluetooth Smart v4.2 + NFC module – external antenna featuring smartBASIC (FCC)
3 PACKAGE CONTENTS
All kits contain the following items:
Development Board
Power Options
The development board has the required BL652 module soldered onto it and
exposes all available hardware interfaces.
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
NFC antenna
Web link card
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.
Supplied with the DVK-BL652-SC development board only. Laird NFC flexi-PCB
antenna.
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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BL652 Development Kit
User Guide
4 BL652 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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5 UNDERSTANDING THE DEVELOPMENT BOARD
Header J12
for nAutoRUN
FTDI-FT232R
J35
J1 Header Plated
Through Holes
(PTH) for UART
TP14 GND
SW3 nReset
Temperature Hook
Button LED2 (J37) J11 Current
Sensor
LED1 (J26) Measurement
J6
J5 (VSP)
Optional
32.768 kHz
Crystal
J29 PTH
DC/USB
Power
Source
Switch
SW4
J41and
PTHJ14
J13
NFC Antenna
Connector CON2
J36
Optional Serial
SPI flash
J3 and J4
I2C device
TP6 Current
U16
Measurement
output of
Current Shunt
Monitor U7
On-board SWD
interface and
programmer
circuitry
DC Jack
7-12V Input
CON1
Arduino
connecters
PTH Test
Points
J23
J16
Arduino
connecters
J33
J31
Arduino
connecters
J32
J30
Figure 1: Dev board contents and locations
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Arduino
connectors
USB2 connector
PTH Test
USB-SWD interface
Points
J22
SPI
J14
EEPROM
device
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Figure 2: Development board DVK- BL652 (fitted with BL652-SA module for example)
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BL652 Development Kit
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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.
J12 Fit Jumper on Pins 2 & 3
SW6 Switch to 3v3
SW5 Switch to 3v3
J6 Jumper on
Pins 1 & 2
TP14 Black
Test Hook
J37 Fit Jumper
J26 Fit Jumper
J7 Fit
Jumper
SW4
Switch
to USB
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
Figure 3: Correct DVK- BL652 development board jumper and switch settings
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6 FUNCTIONAL 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
USB (USB1)
SW4
Position USB
SW5
Position 3V3 always
SW6
Position 3V3/1V8 always
DC jack (CON1) or AAA battery (J7)
USB (USB2) (Note 1)
Position DC
Position USB
Position 3V3 always
Position 3V3 always
Position 3V3/1V8 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.
nRESET_BLE
Reset
nRESET_BLE
R34
150R
GND
1
2
2
2
NOPOP (PIN HEADER,2.54mm 1X2P)
J42
1
1
1
2
SW3
TACT SW,SMD/180d
3
4
3
4
C63
NOPOP (0.01uF,16V)
GND
GND
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.
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1
SWDCLK_BLE
1
SWDIO_BLE
2
2
SWDIO
3
2
J4
PIN HEADER,2.54mm 1X3P
3
1
J3
PIN HEADER,2.54mm 1X3P
2
3
1
SWDCLK
1
3
5
7
9
JP1
2
4
6
8
10
3
VCC_IO
SIO_18
nRESET_BLE
PIN HEADER,1.27mm 2X5P
J3pin2-1 jumper fitted (Default).
J4pin2-1 jumper fitted (Default).
GND
SEGGER J-Link Lite Cortex M-9 JTAG/SWD
Emulator 10-pin connector.
Top view.
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
SWDCLK
SWDIO
nRESET_BLE
SIO.18
Route SWD Interface
from U4 to BL652 Module (and pin)
SWDCLK_BLE (pin 6)
SWDIO_BLE (pin 5)
nRESET_BLE (pin 7)
SIO_18 (pin 9)
Comments
Fit jumper in J4 pin 2-1 (default)
Fit jumper in J3 pin 2-1 (default)
Via NOT Fitted (default)series resistor R111
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.
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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.
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VCC_IO_UART VCC_IO_UART
R2
10K
R3
10K
U15
Module_RTS
USB_CTS
1
NOPOP (TH_TEST_POINT) TP10
1
Module_TX
USB_RX
15
5
3
9
D1_TX
USB-UART
bridge chip
NOPOP (TH_TEST_POINT)
TP11
1
7
13
VCC_IO_UART
D0_RX
FTDI
FT232RQ
R112
10K
R11
10K
11
14
1Y 0
1Z
1Y 1
2Y 0
2Z
2Y 1
3Y 0
3Z
3Y 1
4Y 0
4Y 1
VCC
4Z
S
NC
GND
16 R6 0R
SIO_5
4
R9 0R
SIO_6
8
R12 0R
SIO_7
GND
SIO_8
VCC_IO_UART
BL652
module
UART
J35
1
GND
Module_CTS
R19
10K
R21 0R
12
2
10
6
AnalogSwitch,Four-pole
USB_RTS
VCC_IO_UART
VCC_IO_UART
1
2
2
PIN HEADER,2.54mm 1X2P
R8
10K
VCC_IO_UART
C8
0.1uF,16V
R10
10K
GND
Module_RX
USB_TX
S
Channel
Low
nY0
High
nY1
GND
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 USBUART cable would need to be used. UART signal levels always need to match the supply voltage, VCC_Radio, of
the BL652.
VCC_IO_UART
GND
USB_CTS
VCC
USB_TX
USB_RX
USB_RTS
GND
RTS
VCC GND
RX
TX
CTS
SIO_5
SIO_8
SIO_6
SIO_7
R1
NOPOP (0R)
J1
1
2 1
3 2
4 3
5 4
6 5
6
NOPOP (PIN HEADER,2.54mm 1X6P)
FTDI (USB to TTL 232 Cable)
Module pin BL652 UART
SIO_6
Module_TX
SIO_8
Module_RX
SIO_5
Module_RTS
SIO_7
Module_CTS
Data Flow
Output
Input
Output
Input
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).
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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 Selfcontained 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
BL652 Operating Mode (pin28, nAutoRUN Mode/SIO_13)
nAutoRUN
Pin
Interactive/
Development Mode
Self-contained Run Mode
(nAutoRUN mode)
(SIO_13 set High Externally)
(SIO_13 Low Internally)
Circuit
J12
Jumper
Position
Develop
nAutoRUN (default)
Jumper on J12 pins 2-1
Jumper on J12 pins 2-3
BL652 has internal pulldown 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.
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6.7 vSP (Virtual Serial Port) Modes and OTA (Over the Air) smart BASIC Application
Download
The OTA feature makes it possible to download smart BASIC 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
VSP Bridge to UART
mode
SIO_02 and Jumper position J5
High by fitting jumper in J5
nAutoRUN (SIO_13) and Jumper position J12
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.
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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).
7 SOFTWARE
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)
Port (Mac/Linux)
Baud Rate
Parity
Data Bits
Stop Bits
Handshaking
Note:
1 to 255
Any /dev/tty device
(UwTerminalX only)
1200 to 921,600
Note: Baud rate default is 115200 for BL652.
None
8
1
None or CTS/RTS
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.
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Tip:
If the module returns a four hex digit error code: In UwTerminal, select those four digits, right-click,
and select Lookup Selected ErrorCode (select Lookup Selected Error-Code (Hex) if using
UwTerminalX). A description of the error is then printed on screen.
The following are the differences between UwTerminal and UwTerminalX:
UwTerminal is Windows only whilst UwTerminalX is cross platform
UwTerminal and UwTerminalX have the same overall functionality but some UwTerminal functions are not
available in UwTerminalX including File Player, BASIC tab, multiple file downloading at once, and
communication over TCP port.
8 BREAKOUT CONNECTOR PINOUTS
8.1 J40, J44, J29, J41, J1, J5 SIO (Special Input/Output Sockets) Breakout Connectors
Access to all 32 BL652 series module signal pins (SIO’s = Signal Input /Output) is available on header connectors
J40, J44, J29, J41, J1, J5 (2.54 mm pitch headers).
Note:
The BL652 module signal pins designation SIO (Signal Input /Output).
DEFAULT type is DIO (Digital Input or Output) or UART (on fixed pins)
ALTERNATE type is either AIN (Analog Input ADC), I2C, SPI, DIO (on fixed pins), PWM, FREQ, and NFC
DIO or AIN functionality is selected using the GpioSetFunc() function in smartBASIC
I2C, UART, SPI controlled by xxxOPEN() functions in smartBASIC
SIO_5 to SIO_8 are DIO by default when $autorun$ app runs on power up
SIO_9 and SIO_10 are NFC pins by default, can be set to alternative function SIO using the GpioSetFunc()
function in smartBASIC
These breakout connectors can interface to a wide array of sensors, the BL652 is user configurable through the
smartBASIC application script to change each SIO pin from the default function (DIO, UART) to alternate
functions (AIN (ADC), I2C, SPI, DIO), PWM, FREQ, and NFC. The BL652 development kit incorporates additional
fly-lead cables inside the box to enable simple, hassle-free testing of these multiple interfaces.
Table 7 shows the BL652 module pins that are brought out to plated through Holes (suitable for 2.54 mm pitch
headers).
Table 7: Module pins exposed by plated through holes
Plated Through Holes or Header Connector
J40
NOPOP (PIN HEADER,2.54mm 1X2P)
SIO_3
SIO_4
SIO_0_Header
2
2
1
J44
1
2
2
1
1
J40
BL652 Module Signals Exposed
BL652 pin plated holes for
access
SI0_ 3
SI0_ 4
SI0_ 0
SI0_ 1
SIO_1_Header
NOPOP (PIN HEADER,2.54mm 1X2P)
J44
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Plated Through Holes or Header Connector
C71
12pF, 50V
SB9 NOPOP (Solderbridge_Open)
1
SIO_0
2 1
0R
R127
SIO_0_Header
1
XL1 2
BL652 Module Signals Exposed
Y3
32.768KHz,20ppm,9pF
C70
10pF,50V
2
GND
XL2 2
SB8 NOPOP (Solderbridge_Open)
1
SIO_1
2 1
SIO_1_Header
R128
0R
GND
J29
J29
1
2
3
4
5
6
7
8
9
10
SIO_13
SIO_15
SIO_17
SIO_19
SIO_31
SIO_30
SIO_29
SIO_28
SIO_27
SIO_26
1
2
3
4
5
6
7
8
9
10
NOPOP (PIN HEADER,2.54mm 1X10P)
R17 560R
SIO_17
J26
1
J26
1
2
2
LED1
J26 Connects SIO_17 to LED1
J26 jumper fitted (default).
PIN HEADER,2.54mm 1X2P
R36 560R
J37
SIO_19
J37
1
1
2
2
LED2
J37 Connects SIO_17 to LED2
J37 jumper fitted (default).
BL652 pin plated holes for
access
SI0_ 24
SI0_ 23
SI0_ 22
SI0_ 20
SI0_ 18
SI0_ 16
SI0_ 14
SI0_ 12
SI0_ 11
PIN HEADER,2.54mm 1X2P
J41
NOPOP (PIN HEADER,2.54mm 1X10P)
J41
Eeprom_MISO_SIO_24 1
1
Eeprom_MOSI_SIO_23 2
3 2
SIO_22
4 3
SIO_20
5 4
SIO_18
6 5
SIO_16
7 6
SIO_14
8 7
SIO_12
9 8
SIO_11
10 9
10
GND
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J44 connects to SIO_0 and SIO_1
via 0R resistors R127 and R128.
By default, the optional external
32.768 kHz crystal circuit is not
connected to BL652 as SB8 and
SB9 are open.
BL652 pin plated holes for
access
SI0_ 13
SI0_ 15
SI0_ 17
SI0_ 19
SI0_ 31
SI0_ 30
SI0_ 29
SI0_ 28
SI0_ 27
SI0_ 26
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Plated Through Holes or Header Connector
J1
BL652 Module Signals Exposed
Serial Port plated holes for
access
VCC_IO_UART
GND
USB_CTS
VCC
USB_TX
USB_RX
USB_RTS
GND
RTS
VCC GND
RX
TX
CTS
R1
NOPOP (0R)
J1
1
1
2
3 2
4 3
5 4
6 5
6
SIO_5
SIO_8
SIO_6
SIO_7
NOPOP (PIN HEADER,2.54mm 1X6P)
FTDI (USB to TTL 232 Cable)
J35
Module pin BL652 UART
SIO_6
Module_TX
SIO_8
Module_RX
SIO_5
Module_RTS
SIO_7
Module_CTS
Data Flow
Output
Input
Output
Input
VCC_IO_UART VCC_IO_UART
R2
10K
R3
10K
U15
Module_RTS
USB_CTS
1
NOPOP (TH_TEST_POINT) TP10
1
Module_TX
USB_RX
15
5
D1_TX
NOPOP (TH_TEST_POINT)
TP11
1
7
13
VCC_IO_UART
D0_RX
R112
10K
R11
10K
3
9
11
14
1Y 0
1Z
1Y 1
2Y 0
2Z
2Y 1
3Y 0
3Z
3Y 1
4Y 0
4Y 1
VCC
4Z
S
NC
GND
16 R6 0R
SIO_5
4
R9 0R
SIO_6
8
R12 0R
SIO_7
Module_CTS
SIO_8
VCC_IO_UART
J35
1
AnalogSwitch,Four-pole
USB_RTS
R19
10K
R21 0R
12
2
10
6
GND
VCC_IO_UART
GND
VCC_IO_UART
1
2
2
PIN HEADER,2.54mm 1X2P
R8
10K
VCC_IO_UART
C8
0.1uF,16V
R10
10K
GND
Module_RX
USB_TX
S
Channel
Low
nY0
High
nY1
GND
Jumper in J35 selects between
BL652 UART routed to FTDI or
Arduino:
No Jumper on J35 (default)
Routes SIO_5 (RTS) to FTDI CTS
Routes SIO_6 (TX) to FTDI RX
Routes SIO_7 (CTS) to FTDI RTS
Routes SIO_8 (RX) to FTDI TX
Jumper on J35
Routes SIO_5 (RTS) to TP10
Routes SIO_6 (TX) to Arduino
D1_TX
Routes SIO_7 (CTS) to TP11
Routes SIO_8 (RX) to Arduino
D0_RX
J12
Connects SIO_13 (nAutoRUN) to
FTDI DTR
Default jumper fitted in J12
pin 2-3
J5
SIO_ 2
Can be used to pull-up SIO_2 to
VCC_IO
VCC_IO
R14
560R
2
Default No Jumper fitted on J5
SIO_2
VSP on SIO_2
J5
2
1
1
SIO_2
PIN HEADER,2.54mm 1X2P
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Plated Through Holes or Header Connector
J13
PIN HEADER,2.54mm 1X3P
J13
1
3
1
2
2
3
BL652 Module Signals Exposed
Coulomb_I2C_SCL
Coulomb_I2C_SDA
SIO_27
SIO_26
J13pin2-3 jumper fitted (Default).
J14pin2-3 jumper fitted (Default).
2
0R R108
J14
3
3
2
RTC_SCL 0R R107
RTC_SDA
SCL_ARD
1
1
SDA_ARD
J14
PIN HEADER,2.54mm 1X3P
J13 Routes SIO_27 (I2C SCL) to
RTC_SCL device or Arduino SCL
pin
J13 pin 2-3 jumper fitted
(default).
J14 Routes SIO_26 (I2C_SDA) to
RTC_SDA device or Arduino SDA
pin
J14 pin 2-3 jumper fitted
(default).
J6
J6 routes SIO_3 to Temp Sensor
or the Analog Buffer attenuator
(5V to 1.2V) output
J6 pin 2-1 jumper fitted
(default)
8.2 Arduino Connector for Plugging in an Arduino Shields
The DVK-BL652 development board is NOT an Arduino Shield, but is an Arduino base board (like the Arduino
UNO).
The four Arduino connectors (J30, J31, J32 and J33) on the development board allow Arduino Shields to be
plugged in.
All Arduino connector signals are brought out to Plated-through Holes (2.54mm pitch) J15, J16, J22, J23.
This allows any Arduino connector signal (D0-D13 or A0-A5) to be connected to any BL652 module SIO using
fly leads for maximum flexibility.
All Arduino connector signals (D0-D13 and A0-A5) are connected to the BL652 module via series resistors
(560R), allowing easy disconnection. Table 6 shows the Arduino connector signals and mapping to BL652
module SIO pins.
Arduino connectors orientation are at 90 degrees perpendicular to the long dimension, allowing larger
Arduino Shields to hang off side of the board without interfering with a mounted external antenna or the
BL652 module (the BLE chip antenna).
There are Arduino pins that may be used for special cases on the development board:
Arduino pin IOREF on development board (J33 pin2), is connected to 3.3V domain (VCC_3.3V_ARD) via 0R
resistor (R44). Arduino IOREF allows Arduino shields to adapt to the voltage provided from the board,
Since DVK-BL652 is sending 3.3V up (from the development board) to the IOREF, the Arduino
documentation states that a properly configured Shield should respect our logic levels as a function of this
pin.
Note:
BL652 module PINS DO NOT SUPPORT 5V IO. Do not connect greater than 3.3V IO from Arduino
Shields or others as DVK-BL652 does not have level translators.
If accidently a shield with 5V IO were plugged in, there are series resistors on the DVK-BL652 on all Shield IO
lines to provide very limited protection against an inappropriate logic level (something greater than 3.3V).
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These series resistors provide the voltage drop as current flows through, activating the ESD protection
diode in the BL652 module.
Arduino RESET pin on development board (J33 pin3), is connected to BL652 nRESET pin (U5 pin22) via 0R
resistor (R43).
Arduino AREF is wired out from Arduino connector J32 to plated through holes on J22, which is next to the
Arduino shield connector J32, and is also wired to SIO_2 via R136 (560R). AREF is supplied by a Shield board
and is an input to the Arduino base board to indicate the maximum expected value of the analog signal. The
BL652 module does not support this function.
Arduino D2 pin wired out from Arduino connector J32 to plated through holes on J22, which is next to the
Arduino shield connector J32. Arduino D2 pin is not wired to BL652 (SIO_13) as series resistor R97 is not
fitted.
Table 8: Arduino connectors signals and mapping to BL652 SIO signals
J#
Arduino Connectors and Plated Through Holes (Test points)
J30 BL652 pin plated holes for access
D0_RX
D1_TX
D2
D3
D4
D5
D6
D7
NOPOP (560R)
SIO_13
R97
SIO_14
R129
SIO_15
R130
SIO_16
R131
SIO_17
R132
SIO_18
R133
J29
560R
560R
1
2
3
4
5
6
7
8
560R
J30
1
2
3
4
5
6
7
8
D0(RX)
D1(TX)
D2
D3
D4
D5
D6
D7
D0_RX
D1_TX
D2
D3
D4
D5
D6
D7
1
2
3
4
5
6
7
8
J15
1
2
3
4
5
6
7
8
HEADER,FEMALE,2.54mm,1X8P NOPOP (PIN HEADER,2.54mm 1X8P)
560R
SIO_31
A5
HEADER,FEMALE,2.54mm,1X6P
6
6
A5
5 6
5 6
A4
A5
5
4
4 5
A3
A4
3 4
3 4
A2
A3
2 3
2 3
A1
A2
1 2
1 2
A0
1
1
A1
J31
A0
J16
NOPOP (PIN HEADER,2.54mm 1X6P)
SIO_30
R92 560R
SIO_29
A4
A3
A2
A1
R80 560R
SIO_28
R79 560R
SIO_4
R50 560R
J17
1
A0_5V_IN 2
2 1
A0
PIN HEADER,2.54mm 1X2P
D8
Eeprom_CS_SIO_22
R134 560R
J18
J43
J24
J21
R37
560R
AREF
SIO_22
R136 560R
Eeprom_MOSI_SIO_23
R38 560R 2
J43
2
1
3
R135 560R
SIO_2
3
D9
2
2
J18
PIN HEADER,2.54mm 1X3P
1
SIO_20
1
1
SIO_19
J15 is plated through
holes for accessing
signals on J30
560R
R93 560R
J32
J22
Arduino signals
Arduino female header
J30.
PIN HEADER,2.54mm 1X2P
Eeprom_MISO_SIO_24
R39 560R 2
J24
2
1
1
PIN HEADER,2.54mm 1X2P
Eeprom_SCK_SIO_25
R40 560R 2
J21
2
1
1
PIN HEADER,2.54mm 1X2P
GND
J22
1
D8
2 1
D9
D8
2
3
D10_SS
D9
D11_MOSI 4 3
D10(SS)
D12_MISO 5 4
D11(MOSI)
D13_SCLK 6 5
D12(MISO)
7 6
GND
8 7
AREF
D13(SCLK)
9 8
SDA
GND
10 9
SCL
AREF
10
SDA
HEADER,FEMALE,2.54mm,1X10P
NOPOP (PIN HEADER,2.54mm 1X10P)
SCL
1
D8
2
D9
D10_SS 3
D11_MOSI 4
D12_MISO 5
D13_SCLK6
7
8
AREF
9
SDA
10
SCL
J32
1
2
3
4
5
6
7
8
9
10
SDA_ARD
R42 560R
SCL_ARD
R41 560R
Arduino female header
J31.
J16 is plated through
holes for accessing
signals on J30.
J17 Connects Arduino
A0 pin to Analog Input
Buffer (U3). J17
jumper NOT fitted
(default).
Arduino female header
J32.
J22 is plated through
holes for accessing signals
on J30.
J18 Connects SIO_22 (SPI
CS) to EEPROM (U2) or to
Arduino D10 (for use as
SPI Slave Select). J18
jumper NOT fitted
(default)
J43 Connects SIO_23 (SPI
MOSI) to Arduino D11.
J43 Jumper NOT fitted
(default).
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J#
Arduino Connectors and Plated Through Holes (Test points)
Arduino signals
J24 Connects SIO_24 (SPI
MISO) to Arduino D12.
J24 Jumper NOT fitted
(default).
J21 Connects SIO_25 (SPI
SCK) to Arduino D13. J21
Jumper NOT fitted
(default).
J33
VIN_12V_ARD
VIN_12V_ARD
VCC_3V3_ARD
HEADER,FEMALE,2.54mm,1X8P
8
8
VIN_12V_ARD
7 8
7 8
VIN
7
6
6 7
GND
5 6
5 6
VCC_5V_ARD
GND
4 5
VCC_3V3_ARD 4 5
5.0V
3 4
3 4
nRESET
2 3
3.3V
2 3
IOREF
2
1
1 2
nRESET
1
1
IOREF
J33
GND
J23
SPARE
NOPOP (PIN HEADER,2.54mm 1X8P)
VCC_5V_ARD
VCC_5V_ARD
VCC_3V3_ARD
nRESET_BLE
0R R43
VCC_3V3_ARD
nRESET
IOREF
R44
0R
Arduino female header
J33.
J23 is plated through
holes for accessing
signals on J33.
GND
8.2.1 Analog Input Buffer and Attenuator Circuit (U3)
Figure 11 shows the Analog Buffer circuit that accepts a 0V to 5V analog input signal from Arduino shield pin A0
and scales it down to an acceptable range of 0V to 1.2V set by potential divider R26 (3.3 kOhms) and R28 (1
KOhms) with a gain of 0.23(=1/ (1+3.3)).
Max Input (Volts)
(A0_5V_IN)
R26 (kOhm)
R28 (kOhm)
Output (Volts)
(A0_divided)
5
3.3
1
1.16
VCC_5V_ARD
R18
NOPOP (1K)
GND
C4
0.1uF,16V
R20
1K
GND
U3
1
2
3
4
R22
A0_5V_IN
470R,1%
R24
100K
OUT A
V+
IN A- OUT B
IN A+
IN BVIN B+
8
7
6
5
A0_div ided
R23
1K
Dual OP,5V
GND
GND
R26
3.3K,1%
R28 1K
GND
Analog 5V to 1.2V level translator
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Figure 11: Analog Buffer schematic and PCB
The selection jumper on J6 connects either Temperature Sensor analog output or the output of the Arduino
analog input buffer to SIO_3. By default, no jumper is fitted in J6 in either position. To select the Arduino analog
input buffer to SIO_3, fit the jumper on J7 to short pins 2-3.
8.3 Additional Peripherals/Sensors
The BL652 development board provides for simple and hassle free connectivity to a wide range of sensors, but
also includes several on-board sensors and options to enable a developer to test functionality straight out of the
box.
In the smartBASIC application code written to use sensors on the development board (including the
Temperature sensor (U1) – analog output, Analog Input Buffer (U3) – analog output, SPI EEPROM (U2), I2C RTC
chip (U16), LED1(D1), LED2(D2) Button1(SW1), and Button2(SW2)) the SIO pins direction and type must be set in
the smartBASIC application to override the defaults in the BL652 firmware.
For more information on these sample applications, see GitHub smartBASIC sample applications repository on
the BL652 product page at https://github.com/LairdCP/BL652-Applications
8.3.1 Temperature Sensor
The temperature sensor (U1) by default is connected to the BL652 module as jumper on J6 pin 2-1, bridges
TEMP_SENS and SIO_3.
Analog output temp sensor
V+ 2.4V-3.6V
VCC_3V3
R4
U1
4
C2
0.1uF,16V
V+
Vo
GND
5
GND NC
3
Temp_Sens
470R,1%
2
R5
NOPOP (4.7K)
1
C3
0.1uF,16V
2.4V,10uA,-55dC~+130dC
GND
GND
GND
GND
Figure 12: Temperature sensor schematic and PCB
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The on-board temperature sensor (TI LM20BIM7 - www.ti.com/lit/ds/symlink/lm20.pdf) has an Analogue output
that can be connected to BL652 module pin SIO_3; but since the LM20BIM7 has an analogue output, the BL652
module SIO_3 digital pin (DIO) must be configured as AIN analogue input (ADC). To configure the SIO_3 pin from
DIO pin to Alternate function AIN, see the example file “ts.temperature.sensor.sb” in the GitHub smartBASIC
sample applications repository on the BL652 product page at https://github.com/LairdCP/BL652-Applications
Key specifications of the LM20BIM7 are as follows in Table 9.
Table 9: LM20BIM7 Specifications
Output type
Accuracy at 30ºC
Analogue output
±1.5ºC ±4ºC (max)
Accuracy at 40ºC to +85ºC
Power supply voltage range
approx. ±2.5ºC ±5ºC (max)
+2.4 V to 5.5 V
Current Drain
Output impedance
10 uA (max)
160 Ohms (max)
The LM20BIM7 datasheet states the relationship of Temperature (T) to Voltage output (Vo) can be
approximated as a linear equation (for temperature range of -40ºC to +85ºC):
Vo(mV) = -11.67mV/ºC x T + 1858.3
gives the following calculated Vo versus temperature:
Table 10: LM20BIM7 Temperature to Voltage Output relationship
Temperature (T)
+80ºC
+70ºC
+60ºC
+50ºC
+40ºC
+30ºC
+20ºC
+10ºC
+0ºC
Typical Voltage
+924.7mV
+1041.4mV
+1158.1mV
+1274.8mV
+1391.5mV
+1508.2mV
+1624.9mV
+1741.6mV
+1858.2mV
-10ºC
-20ºC
+1975.0mV
+2091.7mV
-30ºC
+2208.4mV
8.3.2 I2C Sensor (RTC Chip)
The I2C RTC chip (U16) allows the BL652 I2C interface to be tested. The output of the RTC chip (U16) is on the
I2C bus and is by default connected to the BL652 module via jumpers on J13 pins 2-3 and J14 pins 2-3.
Table 11: I2C RTC chip BL652 I2C signal mappings
I2C RTC EEPROM (U16)
(U16 pin6) RTC_SCL
(U16 pin5) RTC_SDA
BL652 module (U5) SIO
(U5 pin38) SIO_27
(U5 pin37) SIO_26
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Comments
Fit jumper on J13 pins 2-3 to select
Fit jumper on J14 pins 2-3 to select
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Jumper on J13 pins 2-1 routes the BL652 I2C_SCL signal to Arduino connector (J32). Jumper on J14 pins 2-1
routes the BL652 I2C_SDA signal to Arduino connector (J32).
VCC_IO
R106
0R
0.1uF,16V
10pF,50V
U16
1
2
3
4
GND
2
Y2
32.768KHz,20ppm,7pF
C62
10pF,50V
GND
R81
0R
X1
X2
VBAT
VSS
C60
VCC
MFP
SCL
SDA
R82
10K
8
7
6
5
R32
10K
R33
10K
TP9
RTC_ALARM
RTC_SCL
RTC_SDA
1
1
C61
NOPOP (TH_TEST_POINT)
GND
I2C RTCC,1.8V~5.5V
GND
GND
PIN HEADER,2.54mm 1X3P
J13
1
3
1
2
2
3
Coulomb_I2C_SCL
Coulomb_I2C_SDA
SIO_27
SIO_26
2
0R R108
J13pin2-3 jumper fitted (Default).
J14pin2-3 jumper fitted (Default).
3
3
2
RTC_SCL 0R R107
RTC_SDA
SCL_ARD
1
1
SDA_ARD
J14
PIN HEADER,2.54mm 1X3P
Figure 13: I2C device RTC chip schematic and PCB
To test the BL652 I2C interface, use smartBASIC application “rtcs.erver.sb ” in the GitHub smartBASIC sample
application repository on the BL652 product page at https://github.com/LairdCP/BL652-Applications. This
application runs on the BL652 and can be used with an Android phone (requires an app such as nRF connect,
https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp&hl=en_GB) or another
BT900/BL620/BL652 loaded with “rtcc.lient.sb”.
The smartBASIC application “rtcs.erver.sb ” is a BLE RTC server, and it advertises the current time (which it gets
from the I2C RTC chip (U4)).
8.3.3 SPI Device EEPROM
The SPI EEPROM device (U2) is connected to the BL652 SPI pins directly. The 3-pin header J18 connects SIO_4
(SPI SS) to EEPROM (U2) or to the Arduino D10 (for use as SPI Slave Select). By default, the BL652 Module SIO_22
(used as the SPI_CS) is connected to EEPROM (U2) slave select line via J8 header with a jumper fitted on J18 pins
2-3. Table 12 lists signal mappings how the SPI EEPROM (U2) is wired to BL652 SIO pins.
Table 12: SPI EEPROM to BL652 SPI signal mappings
SPI EEPROM (U2)
(U2pin6) Eeprom_SCK_SIO_25
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BL652 (U5) SIO
SIO_25
Comments
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SPI EEPROM (U2)
(U2pin2) Eeprom_MISO_SIO_24
(U2pin5) Eeprom_MOSI_SIO_23
(U2pin1) Eeprom_CS_SIO_22
BL652 (U5) SIO
SIO_24
SIO_23
SIO_22 (via header J18)
VCC_IO_UART
SPI sensor (Eeprom 256kb)
0.1uF,16V
VDD 1.7V-5.5V
GND
Fit jumper in J18 pins 2-3 to select, then
configure SIO_22 as an output and drive
output low in smartBASIC application to select
SPI slave (SPI EEPROM U2)
VCC_IO_UART
C1
VCC_IO_UART
R105
10K
Comments
U2
Eeprom_SCK_SIO_25
8
4
6
Eeprom_MISO_SIO_24
Eeprom_MOSI_SIO_23
Eeprom_CS_SIO_22
2
5
1
3
VCC WPn
GND
SCK
HOLDn
SO
SI
CSn
7
256Kb,20MHz
Figure 14: SPI EEPROM schematic and PCB
For a working example of the BL652 SPI interface using the SPI EEPROM (U2), a smartBASIC application for this
will be available in the future in the GitHub smartBASIC sample application repository on the BL652 product
page at https://github.com/LairdCP/BL652-Applications
8.3.4 Push Button and LED Connected to BL652
The two push buttons and two LED’s on the DVK-BL652 are connected to dedicated SIO’s of the BL652 module.
Table 13: LED’s and Buttons to BL652 SIO signal mappings
Part
LED1 (D1)
SIO
SIO_17 (via header J26)
Comments
To connect LED1 to SIO_17, Fit jumper in J26
LED2 (D2)
Button 1 (SW1)
SIO_19 (via header J37)
SIO_11 (via series resistor R83)
To connect LED1 to SIO_19, Fit jumper in J37
Button 2 (SW2)
SIO_15 (via series resistor R94)
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LED2
LED2
LED1
LED1
BL652 Development Kit
User Guide
J26
1
1
1
R17 560R
SIO_17
2
2
R16
1K
1
R15
1K
LED1
D1
Blue,0603
D2
Blue,0603
J37
1
1
2
2
2
R36 560R
SIO_19
2
PIN HEADER,2.54mm 1X2P
GND
GND
LED2
PIN HEADER,2.54mm 1X2P
R83 560R
SIO_11
BUTTON1
R94 560R
SIO_15
BUTTON2
Figure 15: LEDs and Buttons schematic and PCB
The buttons (BUTTON1 and BUTTON2) have no external pull-up resistor, so to use the buttons, the SIO_11 and
SIO_15 pins must be configured as inputs with internal pull-up resistors (which is the default), the following
smartBASIC lines configure the pull-ups:
rc = GPIOSETFUNC(17,1,4)
'//sets SIO_11 (Button1) as a digital in,
strong pull up
rc = GPIOSETFUNC(19,1,4)
'//sets SIO_15 (Button5) as a digital in,
strong pull up
Refer to the smartBASIC application script example “btn.button.led.test.sb” in the GitHub smartBASIC sample
application repository on the BL652 product page at https://github.com/LairdCP/BL652-Applications
The LEDs are active high, meaning that writing a logical one (“1”) to the output pin illuminates the LED.
One example of when push buttons can be used is when a smartBASIC application is written to simulate a
generic data profile. Push buttons can then be pressed to increment and decrement, such as a heart rate.
8.3.5 NFC External Antenna Connector and NFC Antenna RF Matching Circuit
The NFC antenna input connector (CON2) allows the Laird supplied flex-PCB NFC antenna to be plugged in. The
BL652 module NFC circuit uses two pins, pin 15 (NFC1/SIO_9) and pin 16 (NFC2/SIO_10) to connect the
antenna. These pins are shared with GPIOs (SIO.09 and SIO.10). BL652 NFC pins are enabled by default. NFC can
be disabled via smartBASIC application. Pin 15 (NFC1/SIO_9) and pin 16 (NFC2/SIO_10) are configured by
default on the development board schematic to use NFC antenna, but if pin 15 (NFC1/SIO_9) and pin 16
(NFC2/SIO_10) are needed as normal GPIO’s, R98 and R99 must be removed and R100 and R101 must be
shorted by 0R.
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C53 (300pF) and C54 (300pF) are RF tuning of the flexi-PCB NFC antenna.
Table 14: NFC input BL652 SIO signal mappings
BL652 (U5) SIO
Bring out SIO_9 and SIO_10 to
NFC antenna connector (CON2)
Bring out SIO_9 and SIO_10
to Header connector (J36)
pin 15 (NFC1/SIO_9)
Fit R98 0R (default)
Remove R100 0R (default)
Fit R99 0R (default)
Remove R101 0R (default)
Remove R98 0R
Fit R100 0R
Remove R99 0R
Fit R101 with 0R
pin 16 (NFC2/SIO_10)
GND
NFC_SIO_9
NOPOP (0R) R100
FFC/FPC,SMD/90d
5
7
C53
300pF,50V 4 5 GND
4
3
2 3
1 2
6
1 GND
C54
CON2
300pF,50V
R98
0R
0R
NOPOP (0R) R101
R99
1
1
2
2
J36
PIN HEADER,2.54mm 1X2P
NFC_SIO_10
GND
Figure 16: NFC antenna RF matching circuit, NFC antenna connector schematic and NFC plugged in to connector CON2
The smartBASIC application nfc.all.launch.sb in the GitHub smartBASIC sample application repository on the
BL652 product page at https://github.com/LairdCP/BL652-Applications exercises the following over the BL652
NFC:
On Android NFC enabled devices – Opens the Laird toolkit application or shows it in the Google Playstore if
it's not installed
On Windows NFC enabled devices – Opens the calculator
On other NFC enabled devices – Shows the Laird website or text saying this is a BL652
8.3.6 Optional External Serial SPI Flash IC
There is an optional external serial SPI flash IC (U18) that may be used, for example, for data logging purposes.
This optional external serial (SPI) flash (U18) must connect to BL652 module pins SIO_12 (SFLASH_CS), SIO_14
(SFLASH_MISO), SIO_16 (SFLASH_CLK), and SIO_20 (SFLASH_MOSI); in that case, a high level API in smartBASIC
can be used for fast access using open/close/read/write API functions.
Solder bridges SB4, SB5, SB6 and SB7 must individually be shorted to connect this optional external serial (SPI)
flash (U18 to the BL652 module).
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By default, these are GPIO pins. Only when FlashOpen() command appears in the smartBASIC application script
are these lines dedicated to SPI and for talking to the off-board flash.
VCC_IO_UART
VCC_IO_UART
Flash_SPI_CS#_SIO_12
Flash_SPI_MISO_SIO_14
VCC_IO_UART
1
2
3
4
CS#
SO/SIO1
WP#
GND
VCC
HOLD#
CLK
SI/SIO0
8
7
6
5
C5
0.1uF,16V
R125
10K
GND
2
SB4 NOPOP (Solderbridge_Open)
1
SIO_16
2 1
2
SB5 NOPOP (Solderbridge_Open)
1
SIO_20
2 1
Flash_SPI_CLK_SIO_16
Flash_SPI_MOSI_SIO_20
9
NOPOP (Solderbridge_Open) SB6
1
2
SIO_14
1 2
R126
10K
GND
NOPOP (Solderbridge_Open) SB7
1
2
SIO_12
1 2
U18
4Mx1,SPI,1.65~3.6V
GND
GND
Figure 17: Optional external serial SPI flash IC (U18) schematic and PCB
The smartBASIC application for this external optional serial SPI flash IC will be available in the future in the
GitHub smartBASIC sample application repository on the BL652 product page at
https://github.com/LairdCP/BL652-Applications
8.3.7 Optional 32.76 kHz Crystal
The BL652 on-chip 32.768kHz RC oscillator provides the standard accuracy of ±250 ppm, with calibration
required every 8 seconds (default) to stay within ±250 ppm.
The BL652 also allows, as an option, to connect an external higher accuracy (±20 ppm) 32.768 kHz crystal to the
BL652-SX-xx pins SIO_01/XL2 (pin 24) and SIO_00/XL1 (pin 25). This provides improved protocol timing and helps
with radio power consumption in the system standby doze/deep sleep modes by reducing the time that the Rx
window must be open.
To connect the optional external 32.76kHz crystal oscillator circuit to the BL652 module, remove R127 and R128
and short SB8 and short SB9.
C71
12pF, 50V
SB9 NOPOP (Solderbridge_Open)
1
SIO_0
2 1
0R
R127
SIO_0_Header
1
XL1 2
1
Y3
32.768KHz,20ppm,9pF
SIO_0_Header
SB8 NOPOP (Solderbridge_Open)
1
SIO_1
2 1
SIO_1_Header
R128
0R
SIO_1_Header
NOPOP (PIN HEADER,2.54mm 1X2P)
J44
GND
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2
XL2 2
2
C70
10pF,50V
2
1
GND
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Figure 18: Optional external 32.768kHz crystal circuit schematic and PCB
A smartBASIC application will be available in the future in the GitHub smartBASIC sample application repository
on the BL652 product page at http://www.lairdtech.com/products/bl652-ble-module
9 OTHER FEATURES
9.1 Current Consumption Measurement
A removable jumper (on J7) is provided to break the power supply line directly to the module, allowing you to
measure current consumption. For normal operation, the jumper on J7 between pin1 and pin2 must be fitted
(and is fitted by default).
IMPORTANT: To achieve the optimal power consumption of the BL652 series module on the development
board, see the “LowPower.sb” file in the GitHub smartBASIC sample application repository on the
BL652 product page at https://github.com/LairdCP/BL652-Applications.
Note:
This measures the current consumption of the BL652 series module ONLY.
The current drawn by the BL652 series module can be monitored on the development board. Figure 19 shows
the schematic and location of measuring points on the PCB related to current measurements.
VCC_Radio
R47 NOPOP (0R)
R52
0R
R53
0R
R54 1R,1%
TP5
NOPOP (TH_TEST_POINT)
J7 jumper fitted (Default)
2
1
2
GND
U7
CurrentShuntMonitor,200V/V
J7
1
1
1
TP6
TP7
NOPOP (TH_TEST_POINT) NOPOP (TH_TEST_POINT)
2
PIN HEADER,2.54mm 1X2P
2
I(mA)=(Vmeas(mV)/100
VCC_BLE
2
R30
SB1
NOPOP (Solderbridge)
NOPOP (3R3,1%)
2
1
1
GND
VCC_Radio
SB2
NOPOP (Solderbridge_Open)
1
OUT IN-
A2
R76 10R,1%
1
GND
B2
0.1uF,16V
B1
C17
GND IN+
A1
1
R56 1R,1%
GND
Embedded Wireless Solutions Support Center:
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www.lairdtech.com/bluetooth
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© Copyright 2016 Laird. All Rights Reserved
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
BL652 Development Kit
User Guide
Figure 19: Current measurement schematic and PCB
There are two primary ways to measure the current consumption:
Using Ammeter – Connect an ampere meter between the two pins of J7 pins 1-2. This monitors the current
directly.
Using Oscilloscope – The open solder bridge SB2 first needs to be shorted with solder, then the on-board
10 Ohm resistor R76 which is mounted across J7 pins 1-2 can be used as current sense resistor. Connect an
oscilloscope or similar with two probes on the pins on the J7 connector and measure the voltage drop. The
voltage drop is proportional with current consumption. The 10 Ohm resistor is chosen, 10 mV equals
10mA.
There is also a third way to measure current:
Using Current Shunt Monitor – The current drawn by the BL652 module can be monitored using the
Current Shunt Monitor (CSM), INA216 (U7). The gain of INA216 is 200 V/V for the lowest possible drop
voltage.
Note:
Using the current shunt monitor method allows the dynamic current consumption waveforms to be
shown on an oscilloscope as the BL652 radio operates. This can provide insight into power
optimization.
Current consumed by the BL652 series module is measured as a voltage (that is proportional to the current)
using the current shunt monitor (U7). This is performed by connecting a voltmeter or oscilloscope to TP6 and
the ground to TP7. Current in milliamps can be determined from the following equation:
I(mA) = Vmeas_TP6(mV) /100
CAUTION:
Take care not to short TP6 (the Current Shunt Monitor IC (U7)) output to GND, as that will
permanently damage the IC U7.
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: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
BL652 Development Kit
User Guide
10 APPENDIX
10.1 Coin Cell Insertion
To insert the coin cell, follow these steps:
1.
Push the coin cell against positive contact spring of holder J34.
Note: The coin cell sits below the positive contact spring (as shown with arrow).
Figure 20: Inserting the coin cell (step 1)
2.
Push the coin cell down into the holder (J34).
Figure 21: Inserting the coin cell (step 2)
10.2 Coin Cell Removal
To remove the coin cell, follow these steps:
1. Hold down the coin cell holder (J34) at the corners.
2. Use a screwdriver in the position shown in picture below, to gently remove the coin cell from the coin cell
holder (J34), This is the correct method to remove coin-cell from holder (J34).
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: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
BL652 Development Kit
User Guide
Note:
Due to tight fit of coin cell in the coin-cell holder (J34), care should be taken prevent damage to the
J34 land pads.
Figure 22: Removing the coin cell (step 2)
11 ADDITIONAL DOCUMENTATION
Laird offers a variety of documentation and ancillary information to support our customers through the initial
evaluation process and ultimately into mass production. Additional documentation can be accessed from the
Documentation tab of the Laird BL652 Product Page.
For any additional questions or queries, or to receive technical support for this Development Kit or for the BL652
module series, please contact the Embedded Wireless Solutions Support Center: http://ewssupport.lairdtech.com.
© Copyright 2016 Laird. All Rights Reserved. Patent pending. Any information furnished by Laird and its agents is believed to be accurate and reliable. All
specifications are subject to change without notice. Responsibility for the use and application of Laird materials or products rests with the end user since
Laird and its agents cannot be aware of all potential uses. Laird makes no warranties as to non-infringement nor as to the fitness, merchantability, or
sustainability of any Laird materials or products for any specific or general uses. Laird, Laird Technologies, Inc., or any of its affiliates or agents shall not be
liable for incidental or consequential damages of any kind. All Laird products are sold pursuant to the Laird Terms and Conditions of Sale in effect from
time to time, a copy of which will be furnished upon request. When used as a tradename herein, Laird means Laird PLC or one or more subsidiaries of Laird
PLC. Laird™, Laird Technologies™, corresponding logos, and other marks are trademarks or registered trademarks of Laird. Other marks may be the
property of third parties. Nothing herein provides a license under any Laird or any third party intellectual property right.
Embedded Wireless Solutions Support Center:
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www.lairdtech.com/bluetooth
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Europe: +44-1628-858-940
Hong Kong: +852 2923 0610
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