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Bosch Sensortec"|
Application Board 3.0 User Guide
Module descriptions
4.6.1
Main switch
The switch controls the connection between the power source (battery or USB) and the power regulation domains.
4.6.2
Programmable push buttons
Two programmable push buttons are connected to Ground individually through a 360ohm resistor. It is expected that
the internal pull-ups of the microcontroller pins connected to the buttons are enabled to use the button with a falling-
edge active-low configuration. The buttons are named BTN-T1 and BTN-T2.
4.6.3
Debugger connector
This connector helps with recovery of a board with a corrupted nRF52840 while loading custom applications or similar.
Debugging is possible with the connection of a Serial-Wire-Debug interface connector.
Overview
Figure 4 Debugger connector
Pin description
Pin
Name
Description
index
1
Vcc/Vref
Set to 1.8V when the main switch
is set to ON
3
Gnd
Ground
5
Gnd
Ground
7
Key
Not connected
9
Gnd Detect
Ground
4.6.4
Shuttle Board 3.0 connector
The Shuttle Board 3.0 connector allows for the connection of a Shuttle Board 3.0 to be able to prototype one or more
sensors (depending on the Shuttle Board 3.0). Details of the Shuttle Board 3.0 connector can be found under 5.
4.6.5
Temperature sensor
A digital temperature sensor, the Texas Instruments TMP112 is used to be able to measure the temperature of the board.
The sensor can be accessed with the I2C-TEMP bus. Details on how to operate the sensor can be found in the datasheet.
Modifications reserved | Data subject to change without notice
An ARM Cortex-M4 compatible debugger can be
connected using the standard ARM Cortex 10-pin, 2 row,
1.27mm pitch connector.
Table 1 Shuttle pin description
Pin
Name
index
2
SWDIO
4
SWDCLK
6
SWO
8
NC
10
nRESET
Description
Data I/O pin
Clock pin
Trace output pin
Not connected
Active low hardware Reset
Document number: BST-DHW-AN008-00
9 | 22
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