UCD9090A: SCL Frequency Consult

Stanley Dai

Part Number: UCD9090A

Hi Team,

When customer uses CPLD to simulate I2C signal to control UCD9090A here, the setup frequency is 62.5kHz, but UCD9090A will decrease the SCL frequency into 41.6kHz. Do you know what's the reason here and how to solve it? Many thanks for your help.

Best,

Stanley

over 4 years ago

+1 yihe over 4 years ago

TI__Guru 65610 points

Hello

Clock stretching is required to ensure reliable communication. So the speed may be slow down due to this. They can increase the speed to 100KHz so the speed after stretching is higher

Regards

Yihe

0 Stanley Dai over 4 years ago in reply to yihe

TI__Expert 5810 points

Hi Yihe,

Thanks for reply. Is that possible to turn off this clock stretching function in our IC? If yes, how to operate it?

Best,

Stanley

0 yihe over 4 years ago in reply to Stanley Dai

TI__Guru 65610 points

Hello

Clock stretching is required and can not be off.

Regards

Yihe

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UCD9090A: SCL Frequency Consult