TMS570LC4357-EP: Voltage reference max current.

Guillermo Gutierrez

Part Number: TMS570LC4357-EP
Other Parts Discussed in Thread: REF3430-EP, REF3430

Tool/software:

Hi, we are doing a design with the TMS570LC4357-EP and we found in the datasheet, ICCREFHI to be up to 10mA. I am imaging this is a short pulse right?. We are trying to use the voltage reference REF3430-EP, but the maximum output current is 10mA. Should this be good or I need to buffer the reference voltage. If this is a short current pulse and I do not buffered it , what it is the duration so a local capacitor to the ADREFHI pin (lets say 100nF) can handled it ?

21 days ago

0 jagadish gundavarapu 20 days ago

TI__Mastermind 45950 points

Hi Guillermo,

Guillermo Gutierrez said:
Should this be good or I need to buffer the reference voltage. If this is a short current pulse and I do not buffered it , what it is the duration so a local capacitor to the ADREFHI pin (lets say 100nF) can handled it ?

This 10mA is a worst-case scenario. I mean this might be happen when we use all the ADC channels in the controller at the same time. But this might not happen, usually ICCREFHI would be 3mA approximately.

Please refer below thread, the ADC is same in all the Hercules controllers so same value will be applicable here as well.

(3) TMS570LS0432: ICCREFHI and ICCAD - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

So 10mA output current from REF3430 is good enough, and no need to add any additional buffers.

Thanks & regards,
Jagadish.