Data Sheet S11269EJ1V1DS00

4

µµµµ PD16640C

3. PIN FUNCTIONS

Pin Symbol

Pin Name

Description

Driver output

Output 64 gray scale analog voltages converted from digital signals.

Display data input

Inputs 18-bit-wide display gray scale data (6 bits) x 3 dots (RGB).

R,/L

Shift direction select input

This pin inputs/outputs start pulses in cascade mode.

Shift direction of shift register is as follows:

STHR

Right shift start pulse I/O

R,/L = H : Inputs start pulse

R,/L = L : Outputs start pulse

STHL

Left shift start pulse I/O

R,/L = H : Outputs start pulse

R,/L = L : Inputs start pulse

Number of output selection

supply.

Driver voltage selection

CLK

Shift clock input

Inputs shift clock to shift register. Display data is loaded to data register at

rising edge of this pin.

start pulse has been input, and serves as start pulse to driver in next stage.

start pulse has been input, and serves as start pulse to driver in next stage.

103rd clock of driver in first stage serves as start pulse of driver in next stage.

STB

Latch input

Contents of data register are latched at rising edge, transferred to D/A

converter, and output as analog voltage corresponding to display data.

Contents of internal shift register are cleared after STB has been input. One

pulse of this signal is input when

µPD16640C is started, and then device

operates normally. For STB input timing, refer to 8. SWITCHING

CHARACTERISTIC WAVEFORM.

γ-corrected power supply

Inputs

γ-corrected power from external source.

or

Maintain gray scale power supply during gray scale voltage output.

INV

Data inversion input

Input data can be inverted when display data is loaded.

INV = H : Inverts and loads input data.

INV = L : Does not invert input data.

Logic circuit power supply

3.3 V

± 0.3 V

Driver circuit power supply

± 0.3 V

± 0.5 V

Logic ground

Ground

Driver ground

Ground

Caution

and turn off power in the reverse order, to prevent the

µµµµ PD16640C from being damaged by latchup.

Be sure to observe this power sequence even during a transition period.