Microchip Technology BM70-XPro, User Manual

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Pin# Pin name Description
11 I2C SDA
12 I2CSCL
13 Host MCU Rx Connects to BM71 Tx pin
14 Host MCU Tx Connects to BM71 Rx pin
15 SPI SS SPI SS pin of Flash memory
16 SPI MOSI SPI MOSI pin of Flash memory
17 SPI MISO SPI MISO pin of Flash memory
18 SPI SCK SPI SCK pin of Flash memory
19 GND Ground
20 Vdd Power supply
2.4 DIP Switch
The DIP switch has three switches which provide the functions described in the following table.
Table 2-2. DIP Switch Functions
Switch# Function
1 Manually set the BM71 system configuration. Connected to pin P2_0.
• ON: Memory Programming mode
• OFF: Application mode
2 Turn the Blue LED (LD4) ON/OFF
3 Control the GPIO pin P1_3
2.5 Reset Switch
The Reset push button is connected to the BM71 module reset line. When the Reset button is pressed, it drives the
reset line to ground. The BM71-XPro board has an on-board voltage detected reset IC (MCP112) connected to the
Reset pin of the BM71.
2.6 Current Measurement Header
A J3 header can be used for current measurement.. All power to the BM71-XPro is routed through these header pins.
To measure the power consumption of the module, remove the jumper and replace it with an ammeter. To make sure
only the power consumption of the BM71 module is measured, turn off the blue LED using switch #2 of the DIP
switch.
2.7 On-board SPI Flash
An SST25VF080B SPI Flash memory is included in the BM71-XPro board for nonvolatile firmware storage. This can
be used to update the device firmware for the BM71 or the host MCU.
BM71-XPro
Hardware Features
©
2019 Microchip Technology Inc.
DS50002891A-page 5