BQ20Z655-R1: BQ20Z655-R1 Max Pull Down Current on SMB Lines

George Peterson

Part Number: BQ20Z655-R1

The customer would like to know what is the maximum sink current on the SMB lines? The standard says they must sink 350 uA but can the hardware sink more? It is not shown in the datasheet.

Thank You,

George

over 5 years ago

0 Kang Kang over 5 years ago

TI__Mastermind 24870 points

Hello George,

Does page 8 EC table help under the SMBus section? There is an IL spec there. Not sure if that's what you are looking for for VOL.

0 George Peterson over 5 years ago in reply to Kang Kang

TI__Expert 3170 points

Hi Kang,

We already looked at the specifications on page 8 and they are not what we are looking for. We are looking for the amount of sink current the SMB lines can support. This includes the data and clock line. We are looking for the sink current for the output low (IOL).

In some products, they will specify the Vol at a specific Iol. What is the sink current for the Vol measurement on the SMBC and SMBD lines?

Thank You,

George

0 Kang Kang over 5 years ago in reply to George Peterson

TI__Mastermind 24870 points

Hello George,

Can you look at the abs max specs on table 6.1? It looks to be 50 mA for abs max.

However, I'm looking at the page 8 spec and there is a VOL of 0.4 with an I_{L} of 7 mA.

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BQ20Z655-R1: BQ20Z655-R1 Max Pull Down Current on SMB Lines