TSC2046: VBAT current flow

Attila Varhelyi

Part Number: TSC2046

What is the battery drain current flow into VBAT pin in case of unpowered TSC2046 IC?

I think to situation, when VBAT pin is connected to battery, but there is a power switch between battery and DC/DC converter and is switched off.

Reference:

Low Voltage I/O Touch Screen Controller datasheet (Rev. G) (ti.com)

over 1 year ago

0 Sanjay Dixit over 1 year ago

TI__Mastermind 23030 points

The divider on VBAT Line is normally switched on during the sampling period. To control the switch on the divider a voltage is needed. If the device does not have power then the divider should be disconnected and there should be no current drain.

However please note device behaviour on pins is not guaranteed when the device is not powered up. Therefore a sityation when chip is not powered up should be avoided

0 Attila Varhelyi over 1 year ago in reply to Sanjay Dixit

Intellectual 605 points

I understand the physic in theoritical.

Could you tell me value of Ibat in case of unpowered IC situation?

Or could you measure it on any sample/demo board as target value, if any official parameter or simulator does not available?

PS: I forecast it as formula of VBAT/1G Ohm, which is about 3.7nA.

+1 Sanjay Dixit over 1 year ago in reply to Attila Varhelyi

TI__Mastermind 23030 points

Iwould suggest to also place the VBAT at the output of the Power Switch.

Please avoid a situation where an IC is partially powered up.

We do not specify pin behaviour in an unpowered state.

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TSC2046: VBAT current flow