DS90UB948-Q1: I2C clk speed

Roy Chou1

Genius 16090 points

Part Number: DS90UB948-Q1

Hi Team,

I have a question about I2C mode in 948.

1. First I find the SCLK is around 300kHz instead of 400kHz on 948 side.

2. If I set MCU(master1) on 947 side(slave1) and remote 948(slave2), how could we set 948 I2C as fast-plus mode?

Regards,

Roy

0 Charley Cai over 4 years ago

Hi Roy,

The I2C will use internal clock source which could have variations in frequency.

You would need to decrease the value written to the SCL_HIGH and SCL_LOW registers to increase the SCLK to 400kHz.

Best Regards,

Charley Cai

0 Roy Chou1 over 4 years ago in reply to Charley Cai

Charley,

Thanks for information. I find 0x26 ; 0x27 in Datasheet.

Roy

0 Charley Cai over 4 years ago in reply to Roy Chou1

Yes, that's the two registers.

Best Regards,

Charley Cai

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