LP55231: Function of Enable Pin / Cascading Example / stalling I2C

Hans

Part Number: LP55231
Other Parts Discussed in Thread: LP5569

Hello Team,

may I kindly ask you to provide a detailed description of the Enable Pin, please? There is no information on this in the DS.

2) Can you provide an example which shows several LP55231. I guess this is just copy and paste teh schematics with different I2C addresses?

3) Is it ok to clock the I2C with 8kHz? (DS specs max clock with 400kHz, no min. clock)
Can some clock cycles take longer (due to µC activities)?

Thanks and Best Regards,

Hans

over 7 years ago

0 Kenneth Du over 7 years ago

TI__Genius 14295 points

Hi, Hans,

Here I attach an example using 4 LP5569 together, which you can take for reference.

LP5569-1.pdf

It's OK for clock frequency that is less than 400kHz.

Please help to click "Resolve" if the problem is solved.

Thanks.

Regards,

Kenneth

0 Hans over 7 years ago in reply to Kenneth Du

TI__Genius 12865 points

Hi Kenneth,

thanks for the answers. May I ask you to explain the function of the Enable pin, please?

Thanks and Best Regards,

Hans

0 Kenneth Du over 7 years ago in reply to Hans

TI__Genius 14295 points

Hi, Hans,

The Enable pin is used to enable the device and this should be firstly set up high to enable the device.

If EN is low, the shutdown current can be as low as 0.2 uA as you can see from the datasheet.

Thanks.
Regards,
Kenneth

Power management

Power management forum

LP55231: Function of Enable Pin / Cascading Example / stalling I2C