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LC75844M Datasheet(PDF) 11 Page - Sanyo Semicon Device |
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LC75844M Datasheet(HTML) 11 Page - Sanyo Semicon Device |
11 / 14 page No. 6235-11/14 LC75844M The INH pin and Display Control Since the IC internal data (the display data and the control data) is undefined when power is first applied, applications should set the INH pin low at the same time as power is applied to turn off the display (This sets the S1/P1 to S4/P4, S5 to S22, and COM1 to COM4 to the VSS level.) and during this period send serial data from the controller. The controller should then set the INH pin high after the data transfer has completed. This procedure prevents meaningless displays at power on. (See Figure 3.) Notes on the Power On/Off Sequences Applications should observe the following sequence when turning the LC75844M 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 block use a shared power supply, then the power supplies can be turned on and off at the same time. Figure 3 Notes on Controller Transfer of Display Data Since the LC75844M accept display data (D1 to D88) divided into two separate transfer operations, we recommend that applications transfer all of the display data within a period of less than 30 ms to prevent observable degradation of display quality. Internal data Internal data (D45 to D88) Undefined Undefined Defined Undefined Undefined Note: t1 ≥ 0 t2 > 0 t3 ≥ 0 (t2 > t3) tc ... 10 µs min Display and control data transfer D1 to D44 P0 to P2 DR, SC, BU Defined |
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