ADPD188BI

Hi,

As a first glance to what you described, I didn't see any issues with I2C connection. It's correct that you pull CS high to disable SPI. 

Please describe your I2C problem and the waveforms.

Hi,

As a first glance to what you described, I didn't see any issues with I2C connection. It's correct that you pull CS high to disable SPI. 

Please describe your I2C problem and the waveforms.

Thank you for your reply . Recently Im not working on this project so I replied late . I dont know whether Its because that I used a 3.3V to 1.8V chip to cannect the STM32 with ADPD188BI.If I can connect the 3.3V I2C voltage to ADPD188BI directly? .As I see in the datasheet ,the range of I2C is 0~3.6V,of SPI is 0~2.2V. 

So you mean you have a regulator between the microcontroller and ADPD188BI? Ideally, it shouldn't be a problem at all if your regulator works well. In fact, 1.8 V is even safer. You can connect pull-ups to 3.3 V in I2C, but you don't have to.

By the way, did you tie sclk and mosi to the ground? I know you tied cs to 1.8 V.

Hi，

After I received you reply ,I connect my 3.3V I2C signal to EVAL-ADPD188BIZ-S2 ,but It still didn't work ,I will explain it and I wonder If I can get some advice from you .

Here is the EVAL-ADPD188BIZ-S2  board I use .I regard the part I circled with red line as the part  the second picture shows .

As I read <<EVAL-ADPD188BIZ-S2 User Guide>> from  your website , the connection of S2 board is in | Page 7 of 11, and Here is it. (If It's wrong?)

As I signed in the picture above , I connect S2 board with :

Pin 1,2 to 1.8V  . Pin 7 to 3.3V I2C_SDA from STM32  , Pin 8 to 3.3V I2C_SCL from STM32. 

Pin11(SPI_CLK) , Pin13(SPI_MOSI) and pin15,16 to GND .

Pin12(SPI_CS) to 1.8V . And I didn't connect other pins to anything .

Then I will introduce the waveform I get .

First , the picture below is the I2C signal I get From STM32 .

Then ,the picture below is the I2C signal I get when I connect STM32 to EVAL-ADPD188BIZ-S2 board .

It's a soft I2C signal I made ,the IO state is OD .I didn't do any configuration to ADPD188BI， I'm just trying to communicate with it .

So I read register 0x08 (00001000).The I2C slave address is 0x64 (1100100) . The rate is 100kb/s .There are no ACK signals .

But In fact , I can communicate with  two kinds of EEPROMS including M24C02 and AT24C64.

If there is something wrong with my Conncetion or my signal is not pure enough or maybe any reasons?

I've been troubled for a long time . Looking forward to your advice !

It's OK now ! Maybe something  wrong I didn't notice  happened . Thankyou for your advice !