12/22

MSC1215-xx

¡ Semiconductor

CS

Keyscan Stop

Keyscan

Display Data Output

Push

Figure 9. Keyscan Stop Timing

FUNCTIONAL DESCRIPTION

Pin Functional Description

Power supply input pin

Connected to a 12V power supply

• GND

Ground Pin

This pin is 0V level.

• CLOCK

Serial clock input pin

•CS

Chip select input pin

When "H" is input to this pin, interfacing with a MCU is available through the CLOCK and the

DATA pins.

Therefore, 2 signal lines of the CLOCK and the DATA can be shared with other peripherals.

• DATA I/O (Input-output)

Serial data input-output pin

This pin inputs display data and outputs keyscan and A/D conversion data.

•VK

Daylight/dark mode selection input pin

When "H" is input, the dark mode is selected and an output duty cycle is determined by analog

or PWM data input into the VD pin.

When "L" is input, the daylight mode is selected and the output duty cycle becomes about

100%.

•VD

Analog/PWM dimming data input pin

Analog/PWM dimming mode selection will be done by an internal detection circuit automati-

cally.

Reference voltage output pin for the A/D converter