LC871HC4A/92A

No.A1188-11/27

Power Pin Treatment

Connect the IC as shown below to minimize the noise input to the VDD1 pin. and extend the backup period. Be sure to

electrically short the VSS1, VSS2, and VSS3 pins.

Example 1: When the microcontroller is in the backup state in the HOLD mode, the power to sustain the high level of

output ports is supplied by their backup capacitors.

Example 2: The high level output at ports is not sustained and unstable in the HOLD backup mode.

VSS1 VSS2 VSS3

VDD1

VDD2

VDD3

Power

supply

For backup

LSI

LSI

VSS1VSS2VSS3

VDD1

VDD2

VDD3

Power

supply

For backup