UM1871 datasheet(20/64 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM1871

20/64

DocID027604 Rev 3

2.10

MicroSD card

The 4GB (or more) microSD card is connected to SDIO interface of STM32F446ZET6.

MicroSD card detection is managed by MFX_IO15, configured with internal pull-up. The

following solder bridges are closed to support microSD card by default: SB26, SB27, SB28,

SB29, SB30, SB47.

2.11

Potentiometer

A 10 KΩ potentiometer P2 is connected to PA4 of the STM32F446ZET6 on the board.

The following solder bridges must be closed to connect potentiometer to PA4: SB91, SB92,

SB94, SB103. The potentiometer is not connected by default to PA4, since SB94, that is

marked in red in Figure 5, is opened to support camera interface by default.

A low pass filter can be implemented, by replacing SB92 and C86 with the right value of

resistor and capacitor, as requested by the end user’s application.

Figure 5. Solder bridge to be added on bottom side for motor control

JP6

RS232_TX input of RS232 transceiver is connected to PA9 (USART1_TX in

conjunction with JP7) when JP6 is set as shown below (default setting):

RS232_TX from ST-LINK is connected to PA9 (USART1_TX in conjunction with

JP7) to support virtual com port when JP6 is set as shown below:

Table 8. RS232 and IrDA related jumpers (continued)

Jumper

Description

UM1871 데이터시트(PDF) 20 Page - STMicroelectronics