lpcware

VREFP shut down external reference

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by uknoblic on Tue Mar 11 07:59:45 MST 2014
Hi,

we decided to use a LM4040 external voltage reference (2.5 V) connected to the VREFP pin. Depending on the shunt resistor this voltage reference draws something above 60 µA which is not acceptable for our battery driven application. Our idea is to provide the LM4040 supply voltage from any LPC1768 pin and shut down the reference when the ADC is not needed. Is there something to consider using this approach?

Regards

Ulf

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