AN4068 datasheet(31/63 Pages) STMICROELECTRONICS

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AN4068

ST7580 reference design description

Doc ID 022923 Rev 2

31/63

7.2.2

Digital interfaces to the STM32

The EVALST7580-1 allows the STM32F103CB microcontroller to be accessed via its

available interfaces:

●

Serial wire/JTAG debug, that enables either a serial wire debug or a JTAG compliant

debug through the JTAG1 connector

●

USB 2.0 full speed through the mini-USB CN4 connector

●

2 SPI interfaces:

–

one is used to access an external µ-SD card with FAT32 support through the µ-SD

CN2 connector

–

the second works at 18 Mbit/s and presents the SPI signals at the J1 strip

connector

●

I2C

●

A second UART (TXD and RXD signals), in addition to the one used for the ST7580

connections.

I2C and UART signals are accessible through the same J2 double strip connector.

The NRST signal is externally accessible through a pushbutton.

An extract of the EVALST7580-1 board schematics for the digital interfaces of the STM32 is

depicted in Figure 18:

Transmitted

power line

signal levels

Analog

PA_OUT

PB1

The connection allows the STM32 to

monitor the ST7580’s PA_OUT voltage

level. The connection is realized through a

suitable partition (between two high-value

1% tolerance resistors) to properly limit

the signal level within the STM32 input

range.

CL voltage level

Analog

PA0

The connection allows the STM32 to

monitor ST7580’s CL pin voltage level and

to extract information about the ST7580

output current during power line

transmission.

Table 6.

Connections between STM32F103CBT6 and ST7580 devices on EVALST80-1 board

Connection

type

ST7580 pins

STM32F103

pins

Notes

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