6

Electrical Description

Pin Function

Description

RESET (RST)

Sets Control Register bits to logic low. The Dot Register contents are unaffected by the

Reset pin. (logic low = reset; logic high = normal operation).

Serial Data input for Dot or Control Register data. Data is entered on the rising edge of the

Clock input.

Serial Data output for Dot or Control Register data. This pin is used for cascading

multiple displays.

CLOCK (CLK)

Clock input for writing Dot or Control Register data. When Chip Enable is logic low, data

is entered on the rising Clock edge.

REGISTER SELECT (RS)

Selects Dot Register (RS = logic low) or Control Register (RS = logic high) as the

destination for serial data entry. The logic level of RS is latched on the falling edge of

the Chip Enable input.

CHIP ENABLE (CE)

This input must be a logic low to write data to the display. When CE returns to logic

high and CLK is logic low, data is latched to either the LED output drivers or a Control

Register.

OSCILLATOR SELECT

Selects either an internal or external display oscillator source. (SEL) (logic low = External

Display Oscillator; logic high = Internal Display Oscillator).

OSCILLATOR (OSC)

Output for the Internal Display Oscillator (SEL = logic high) or input for an External

Display Oscillator (SEL = logic low).

BLANK (BL)

Blanks the display when logic high. May be modulated for brightness control.

Ground for LED drivers.

Ground for logic.

Positive supply for LED drivers.

Positive supply for logic.