TPSM8D6B24: I hope you can help analyze the abnormality. The single board uses 8pcs

user6481287

Part Number: TPSM8D6B24

Tool/software:

The TPSM8D6B24 module has 8PCS attached to one board this time. Currently, after the chip is powered on, ALERT has been pulled down. When checking the registers, it was found that the value of the 7E register is 02h, which is the alarm type shown in the figure below. Can you help investigate why this alarm occurs (the module input power is 12V, but it is not enabled)? I hope you can analyze the possible problems and review the schematic diagram;

8 months ago

0 Savith Kumar Rayakanti 8 months ago

TI__Expert 5990 points

Can you check when CLK is powered up (VCC3V3) relative to the TPSM8D6B24 module. If CLK is low for more than 25ms after the TPSM8D6B24 modules has been powered, it may declare a PMBus time-out (this is part of the SMBus Spec) which would trigger an "OTHER" communications warning.

May I know if the module configured in standalone or stacked mode?

pls see the below table from datasheet for how to connect different pins in different configurations

Thank you

Savith

0 user6481287 8 months ago in reply to Savith Kumar Rayakanti

Intellectual 970 points

1. The 12V power supply of the module is earlier than the 3V3 power supply of the Pmbus

2, the module works in independent mode

0 Savith Kumar Rayakanti 7 months ago in reply to user6481287

TI__Expert 5990 points

1. can you check what is the time between 12Vin to CLK to understand the below,

"If CLK is low for more than 25ms after the TPSM8D6B24 modules has been powered, it may declare a PMBus time-out (this is part of the SMBus Spec) which would trigger an "OTHER" communications" as mentioned previously

2.Schematic connections are fine and you can also check excel calculator for more assistance.

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Thank you

Savith