topic PCA9698DGG is not working in Digital Signal Controllers

PCA9698DGG is not working

JHKIM7 — Sat, 29 May 2021 04:51:31 GMT

Hi ALL

I am evaluating PCA9698DGG, but PCA9698DGG is not working.

You can see the waveform and schematic as like below.

The waveform capture conditions are below.

Some strange thing is that SDA signal is very fast drop down after received ACK.

Also, I had changed SCL frequency and Slave address, but result is same.

Could you please help this issue?

Best regards.

JH Kim

guoweisun — Mon, 31 May 2021 07:15:14 GMT

1: What's the result when your drop down the frequency?

2:what's the pull up resistors of SDA/SCL of PCA8698?

JHKIM7 — Tue, 01 Jun 2021 03:09:32 GMT

The pull up resistors are located at MCU side. The value is 1.5Kohm.

I think normal working I2C, but PCA9689 output is "0" level under below condition.

I think PCA9689 output is high level under upper condition.

I don't know what's wrong with no output.

Could you please adivce?

Thanks,

JH Kim

JHKIM7 — Wed, 02 Jun 2021 11:10:45 GMT

Regarding to datasheet, output enable when OEPOL = 1.

But in my case, output enable when OEPOL = 0

Is PCA9698DGG datasheet correct on OEPOL and OE Pin?

Thanks

JH Kim

guoweisun — Mon, 07 Jun 2021 02:11:22 GMT

OEPOL bit controls the polarity of OE pin.
– OEPOL = 0: OE pin is active LOW.
– OEPOL = 1: OE pin is active HIGH (equivalent to OE pin).

when OEPOL set to 0,low OE active.