TCAL9539-Q1: How to let the device enter standby mode ?

PYTsai

Genius 12320 points

Part Number: TCAL9539-Q1

Tool/software:

May I confirm is it correct if fSCL = 0 kHz will let the device enter standby mode ?

10 months ago

0 Tyler Townsend 10 months ago

TI__Guru 62718 points

Hi PYTsai,

TCAL9539-Q1 is compatible to the SMBus spec, but not compliant. It does not implement standby mode for clock = 0 kHz.

Regards,

Tyler

0 PYTsai 10 months ago in reply to Tyler Townsend

TI__Genius 12320 points

Hi Tyler

But the datasheet do mentioned standby spec as below, would you help comfirm what it is ? and how to enter that mode ?

0 Tyler Townsend 10 months ago in reply to PYTsai

TI__Guru 62718 points

Hi PYTsai,

Let me get back to you by end of today.

Regards,

Tyler

0 Tyler Townsend 10 months ago in reply to Tyler Townsend

TI__Guru 62718 points

Hi PYTsai,

This is different from standby mode in SMBus.

This standby mode is the current when the conditions in red are met. Not when SCL is held LOW for a period of time.

For standby mode current to be measured,

SCL & SDA & /RESET = VCC through a PU resistor

P-port & ADDR = VCC or GND,

I/O's = INPUTS

IO = 0 mA

fSCL = 0 kHz (meaning clock is idle HIGH, not toggling at any frequency)

If this was SMBus compatible, we would have characterized a section in the datasheet for SMBus, however, this device can have 0 kHz for a clock frequency.

Regards,

Tyler

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TCAL9539-Q1: How to let the device enter standby mode ?