HD66130T Datasheet, PDF (11/16 Pages) Hitachi Semiconductor – 320-channel Low-voltage Segment Driver for Dot-Matrix STN Liquid Crystal Display

HD66130T
4.1 Turning on the power
1) Turn on the power in the order of GND- V_CC, GND-V0, and VM/V1. Then, ground the DISP pin.
2) The LCD forcibly outputs the VM level by the DISPOFF function.
3) Even if an input signal is disturbed immediately after V_CC is applied, the DISPOFF function has priority.
4) Input the specific signal to initialize registers in the driver. The initialization period must be at least one
frame.
5) The preparation of normal display is completed. Input the V_CC level to the DISP pin to cancel the
DISPOFF function. At this time, the level of pins V0, VM, and V1 must rise to the specific potential.
4.2 Turning off the power
The procedure is basically the reverse for turning on the power.
1) Ground the DISP pin.
2) Turn off the liquid crystal power in the order of VM/V1 and GND-V0.
3) Ground V_CC and an input signal.
At this time, the level of pins V0, VM, and V1 must fall to 0 V. Since the DISPOFF function stops when
V_CC falls to 0 V, the LCD may output a level other than VM. Therefore, a display failure may occur when
the power is turned off or on.
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