UM1817 datasheet(24/58 Pages) STMICROELECTRONICS

24 / 58 page

Hardware layout and configuration

UM1817

24/58

DocID026902 Rev 3

2.18

IR LED and IR receiver

The IR receiver TSOP34836 is connected to PC6 of the STM32F091VCT6 and a current

around 100 mA on IR LED is driven by PB9 through transistors T4 and T5 on the board.

Note:

The IR LED may be driven by PB9 directly with 20 mA current when SB20 is closed and

R116 is removed.

2.19

8x USARTs

USART chain could be routed to a 2*8 header so that some jumpers could be used to

connect them to demonstrate 8x USART channels in daisy chain.The data flow is showed in

the below Figure 8.

Figure 8. USART data flow

At the end both data sent at USART1_TX and data received at USART_RX can be

compared and validated thanks to USARTs chain on CN1.

Warning:

USART1/4/8 belongs to VDDIO2 power domain and

USART2/3/5/6/7 belongs to VDDIO power domain, so the

same voltage level for VDDIO and VDDIO2 is needed, to

demonstrate USART chain application on this header.

2.20

Display and input devices

The 2.4” color TFT LCD connected to SPI1 port of the STM32F091VCT6 and 4-general-

purpose-color LEDs (LD 1,2,3,4) are available as display device. The 4-direction joystick

(B3) with selection key, which connects to PA0 and supports wakeup feature, and Tamper

button (B2) are also available as input devices (see Table 16).

USART1_TX

USART2_RX

USART2_TX

USART3_RX

USART3_TX

USART4_RX

USART4_TX

USART5_RX

USART5_TX

USART6_RX

USART6_TX

USART7_RX

USART7_TX

USART8_RX

USART8_TX

USART1_RX

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