Rev. 1.10

26

November 25, 2015

HT9B95A/B/G

Power Supply Sequence

• If the power is individually supplied on the LCD and VDD pins, it is strongly recommended to follow the

Holtek power supply sequence requirement.

• If the power supply sequence requirement is not followed, it may result in malfunction.

Holtek Power Supply Sequence Requirement:

1. Power-on sequence:

Turn on the logic power supply VDD first and then turn on the LCD driver power supply VLCD.

2. Power-off sequence:

Turn off the LCD driver power supply VLCD. First and then turn off the logic power supply VDD.

3. The Holtek Power Supply Sequence Requirement must be followed no matter whether the VLCD voltage is

higher than the VDD voltage.

• When the VLCD voltage is smaller than or is equal to VDD voltage application

Voltage

Time

VLCD

VDD

1µs

VDD

VLCD

1µs

• When the VLCD voltage is greater than VDD voltage application

VLCD

1µs

VDD

VLCD

1µs

Time

VDD

Voltage