Please help: SI4463 initialization failed, debugging found that SDO has been high level 2.0V

wqm2014

I've been tuning the 4463 chip recently, but after a week of tuning, I still can't figure it out. So I'd like to ask the experts for advice:

After si4463 executes reset, it executes power_up again and finds that the NIRQ pin is pulled low normally. Then it checks CTS and finds that SDO is always at a high level, no matter what command is sent, and it is only 2V. The chip is powered by 3V.

Here is a rough outline of the code:

void main()

{

reset（）;

power_up();

CheckCTS()；

......

CheckCTS();

........

CheckCTS();

while(1)

{

..........

}

}

/************I found that the program can run normally, but it behaves normally when executing reset() and power_up(). When executing checkCTS(), sending 0x44 can also read 0xFF, but after sending 0xFF, it still reads 0xFF. I saw some routines querying CTS to send and receive 0xFF, and it will read 0x00. Later, I found that the SDO pin is always high. I don’t know why? ******************************/

void reset（）

{

SDN=1;

DelayUs(400);

SDN=0;

DelayMs(5);

}

void power_up()

{
SendCommand(7,&command[0]); // 0x02, 0x01, 0x00, 0x01, 0xC9, 0xC3, 0x80

}

void CheckCTS()
{
uint8_t CTSValue;
do{
CTSValue=SPIbyte_WRITE(CMD_CTS); //0x44
SPIbyte_WRITE(CTSValue);

}
while(CTSValue!=u8bitFF);

}

Jacktang

si4463 initialization failed, GPIO output level is uncontrollable
To analyze why initialization failed, first check the hardware circuit, and make sure the connection is correct.

盛世辉煌电子科学

The hardware circuit may have component pins that are poorly soldered.

wqm2014

Shengshihuihuang Electronic Science published on 2022-11-27 09:13 The hardware circuit may have component pins that are poorly soldered

Hello, thanks for your answer, but I also doubted the hardware pins, and then tried with two 4463 modules, but the result was the same. I also checked the SPI timing, and set it to send on the falling edge, receive on the rising edge, and idle CLK to low, but it still didn't work, and I reached a dead end.

wqm2014

Jacktang posted on 2022-11-27 09:11 si4463 initialization failed, GPIO output level is uncontrollable. To analyze why the initialization failed, first check the hardware circuit, what must be guaranteed is...

Thank you for your answer. But I have checked the hardware, and then bought a 4463 module and tried it, but it is still the same. The SPI connection is in accordance with the standard wiring.