TMS570LS1224: Clarification on analog input clamp current

Danilo A.

Part Number: TMS570LS1224

Hi Team,

Our customer would like to confirm about the analog input clamp current stated in the datasheet and errata.

I am using TMS570LS1224 and in the datasheet the information about "Analog input clamp current" is, that it is some value when input voltage exceeds Vccad + 0,3V. In Errata there is some additional information about injecting current into an input channel and it says that it happens when the input voltage exceeds Vccad - 0,3V....

I would like to make sure that the info in Errata is correct and it is really Vccad - 0,3 V and not Vccad + 0,3V. Could you advise on that?

Thank you for your support!

Regards,

Danilo

over 2 years ago

0 QJ Wang over 2 years ago

TI__Guru**** 186176 points

Hello Danilo,

The valid the analog input is VSSAD ≤ VIN ≤ VCCAD.

The IAIK in Table 7-19 list the clamp current when the input is out of the valid range: >VCCAD+0.3 and < VSSAD-0.3

The Errata suggests to limit the analog input to be less than VCCAD-0.3.

0 Pavel Nemec over 2 years ago in reply to QJ Wang

Prodigy 10 points

Hello QJ Wang,

the last sentence is what I needed to be sure of. Thanks a lot for your fast reply.

Kind regards,
Pavel Němec

Arm-based microcontrollers

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TMS570LS1224: Clarification on analog input clamp current