Electrical Description
Pin Function
RESET (RST)
Description
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 input for writing Dot or Control Register data. When Chip Enable is
logic low, data is entered on the rising Clock edge.
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 onthe
falling edge of the Chip Enable input.
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.
Selects either an internal or external display oscillator source. (SEL) (logic
low = External Display Oscillator; logic high = Internal Display Oscillator).
Output for the Internal Display Oscillator (SEL = logic high) or input for an
External Display Oscillator (SEL = logic low).
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.
DATA IN (D
IN
)
DATA OUT (D
OUT
)
CLOCK (CLK)
REGISTER SELECT (RS)
CHIP ENABLE (CE)
OSCILLATOR SELECT
OSCILLATOR (OSC)
BLANK (BL)
GND
LED
GND
LOGIC
V
LED
V
LOGIC
8
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