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MC5701 LCD Driver

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THE INHB PIN AND DISPLAY CONTROL

Since the IC internal data (1/3 duty: the display data D1 to D318 and the control data, 1/4 duty: the display data

D1 to D420 and the control data, static drive: the display data D1 to D106 and the control data) is undefined when

power is first applied, applications should set the INHB pin low at the same time as power is applied to turn off the

display (This sets the SEG1 to SEG105, COM1 to COM3, and COM4/SEG106 to the VSS level.) and during this

period send serial data from the controller. The controller should then set the INHB pin high after the data transfer

has completed. This procedure prevents meaningless displays at power on. (See Figure 3 and 4)

NOTES ON THE POWER ON/OFF SEQUENCES

Applications should observe the following sequences when turning the MC5701 power on and off.

 At power on: Logic block power supply (VDD) on → LCD driver block power supply (VLCD) on

 At power off: LCD driver block power supply (VLCD) off → Logic block power supply (VDD) off

However, if the logic and LCD driver blocks use a shared power supply, then the power supplies can be turned on

and off at the same time.

1/3 DUTY

Figure 3.

VIL

Display and control data transfer

Undefined

UndefinedDefined

Defined

LCD

INHB

Internal data

Internal data (D109 to D213)

Internal data (D214 to D318)

D1 to D108

CT0 to CT2

DR, DT, FC, SC, BU

Notes:

t1 ≥ 0

t2 > 0

t3 ≥ 0 (t2 > t3)

tc …… 10uS min.

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Myalarm V-LCD1 Manuel d'utilisateur Page 36