UCD90320: Questions of UCD90320

Jimmy Lai

Part Number: UCD90320

Dear Team,

How can I access the voltage values of the 32 mon pins of UCD90320 through I2C?
Is there a corresponding register manual? I mean accessing through I2C command line, please help provide the address of this register? And the corresponding relationship between each bit of the register address and the MON number. Thanks a lot.

Many Thanks,

Jimmy

over 2 years ago

0 yihe over 2 years ago

TI__Guru 66860 points

Please follow section 4 https://www.ti.com/lit/pdf/slva385

Regards

Yihe

0 Dhruv Choksi over 2 years ago

Prodigy 80 points

You can read it using READ_VOUT (0x8B) command. Note this command is page specific i.e. it gives voltage value of a given page. You can change the page number using PAGE(0x00) command. Page 0 corresponds to rail 1, page 1 to rail 1 and so on. Also the value that you read is of format L16 (you can think of it as a raw voltage value). To convert it to actual voltage you need to use the following equation,

Actual voltage = raw_voltage * 2^N (N can be obtained from the lower 5 bits of VOUT_MODE (0x20) register.)

You can refer to datasheet and PMBus command reference of UCD90320 which can be find here (https://www.ti.com/product/UCD90320) under technical documentation.

Power management

Power management forum

UCD90320: Questions of UCD90320