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  3. AR# 52624: 7 series XADC - Can we drive analog input to XADC when Vcco is unpowered?

AR# 52624

7 series XADC - Can we drive analog input to XADC when Vcco is unpowered?

Description

If there are no digital inputs in the XADC I/O bank , but it only uses XADC and some analog inputs, does it still need to connect power to Vcco in the bank?

Solution

It is recommended that you connect all Vccoinputson a device in order to provide ESD protection for the I/Os.Driving the I/Os of the device before the device is powered is not recommended. If the I/Os are driven before the device is powered, it is required that the current is limited to the specificationin the data sheet. This applies to allI/Os, includingthe XADC pins.

AR# 52624
Date 12/10/2012
Status Active
Type General Article
Devices