UM1537 datasheet(16/52 Pages) STMICROELECTRONICS

16 / 52 page

Hardware layout and configuration

UM1537

16/52

Doc ID 023059 Rev 1

The RS-485 communication is supported by the RS-485 transceiver ST485ABDR, which is

connected to pin4 and pin9 of the D-type 9-pin connectors CN7 (that share the same

connector as USART1).

2.8

Linear sensor

The linear sensor is supported on the STM320518-EVAL evaluation board and connected to

four capacitive sensing channels (PB[11:14]) in group6 with an active shield connected to

two capacitive sensing channels (PC5 and PB0) in group3.

Note:

The linear sensor is only fully functional when the STM320518-EVAL is powered on power

mode 1 (both VDD and VDDA are connected to a fixed 3.3 V). It is potentially necessary to

adjust the capacitor value of C14 and C15 and the firmware to adapt them to the voltage

range from 2 V to 3.6 V of VDD on power modes 2 and 3.

2.9

MicroSD card

The 2 GB (or more) MicroSD card connected to the SPI1 port of the STM32F051R8T6 is

available on the board. MicroSD card detection is managed by the standard IO port PB15.

2.10

Analog input

The two-pin header CN8 and 10 kohm potentiometer RV3 are connected to PC1 of the

STM32F051R8T6 as an analog input. A low-pass filter can be implemented by replacing

R60 and C36 with the correct resistor and capacitor values as required by the end-user

application.

2.11

LDR (light dependent resistor)

The VDDA is divided by the resistor bridge of the LDR VT9ON1 and 8.2 K resistor. It is

connected to PA1 (COM1_IN+/ADC IN1) as shown in Figure 4.

Table 11.

RS-485 related solder bridges

Jumper

Description

SB11,SB12

The external failsafe biasing are enabled when solder bridges SB11 and SB12 are

closed.

Default setting: not fitted

SB8

The bus termination is enabled when solder bridge SB8 is closed.

Default setting: not fitted

SB16

The AC termination is disabled when solder bridge SB16 is closed for high baud rate

communication.

Default setting: not fitted

UM1537 bảng dữ liệu(PDF) 16 Page - STMicroelectronics

UM1537 bảng dữ liệu(HTML) 16 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

bảng dữ liệu tải về

Link URL