BQ40Z50-R1: PEC Calculation for other Microcontrollers

Zie Hao Kek

Part Number: BQ40Z50-R1

Hi,

Due to several reasons, I am using other MCUs to read data from a BQ40Z50-R1.

I manually wrote a write block a read block to get data from the ManufacturerBlockAccess 0x44.

When writing using I2C, the information cannot be retrieved , which I suspect is due to the PEC byte after the last data byte.

So what I want to ask is, is there a certain function I can add into my code to calculate the PEC byte for me to successfully retrieve the information I need?

Thanks.

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

Hi Zie Hao Kek,

The bq40z50-r1 has the option of ignoring the SMBUS PEC if you communicate with it at 0x16. Otherwise, this is the standard SMBUS PEC which is per specification. It is just the sum of addr and data bytes.

0 Zie Hao Kek over 6 years ago in reply to Batt

Prodigy 60 points

Hi Batt,

Thanks for the reply. Just to clarify, the sequence of byte I have to send over to the bq40z50-r1 for a block write then block read is as follows?

addr write: 0x16

manufacturer block access: 0x44

length: 0x02

data: 0x06, 0x00 (for a 0x0006)

(any wait time?)

addr read: 0x17

manufacturer block access: 0x44

length: receive from bq40z50-r1

data: receive from bq40z50-r1

0 Batt over 6 years ago in reply to Zie Hao Kek

TI__Mastermind 42535 points

Hi Zie Hao Kek,

Yes, that is correct.

Power management

Power management forum

BQ40Z50-R1: PEC Calculation for other Microcontrollers