BQ79606A-Q1: stack device number and transmission delay

Huang David

Part Number: BQ79606A-Q1

Hi Expert,

From the datasheet, the device can support up to 64 devices for stack, but is there any data transmission delay for every device and how does these delay impact the stack devices number? Still 64?

Thanks

Best regards,

David

over 2 years ago

0 Helen Sun over 2 years ago

TI__Intellectual 2375 points

Hi,

Yes the stack device number can still go up to 64. please see datasheet section 8.5.1.3.2 Daisy Chain Protocol Description for timing details on daisy chain communication details.

Thanks,

Helen

0 Huang David over 2 years ago in reply to Helen Sun

Intellectual 320 points

Hi Helen,

Thanks for your feedback. What is the data transmission delay for every device?

Best regards,

David

0 Helen Sun over 2 years ago in reply to Huang David

TI__Intellectual 2375 points

David,

It will depend on your communication control settings. Please see datasheet page 63 for more information.

thanks,

Helen

0 Huang David over 2 years ago in reply to Helen Sun

Intellectual 320 points

Hi Helen,

Page 63 looks like "daisy chain protocol" and did not touch any transmission delay impact.

Best regards,

David

0 Taylor Vogt over 2 years ago in reply to Huang David

TI__Genius 17370 points

David,

Transmission delay between devices depends on the amount of data being transmitted. Here is an example estimate of a stack response with 6 devices assuming base bq79600 using spi mode:

Stack response
Number of devices	6	Devices
Stack read response frame/device (over head+payload)	326.25	us
VIF CLK (re clk time)	4	us
SPI TX FIFO delay	12	us
Total re clk time	28	us
Total stack cmd time	93.25	us
Total stack response time	2209	us
Total stack cmd + resp time	2302.25	us

Regards,

Taylor

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BQ79606A-Q1: stack device number and transmission delay