HCMS-2913 datasheet(6/17 Pages) BOARDCOM

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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).

DATA IN (DIN)

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

input.

DATA OUT (DOUT)

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

plays.

CLOCK (CLK)

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

tered 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 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 (SEL)

Selects either an internal or external display oscillator source. (logic low = External Display Oscil-

lator; logic high = Internal Display Oscillator).

OSCILLATOR (OSC)

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

lator (SEL = logic low).

BLANK (BL)

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

GNDLED

Ground for LED drivers.

GNDLOGIC

Ground for logic.

VLED

Positive supply for LED drivers.

VLOGIC

Positive supply for logic.

Optical Characteristics at 25

°C[1]

VLED = 5.0 V, 50% Peak Current, 100% Pulse Width

Peak

Dominant

Luminous Intensity per LED [2]

Wavelength

Character Average (

µcd)

lPeak (nm)

ld[3] (nm)

Display Color

Part Number

Min.

Typ.

Deep Red

HCMS-29x5

770

645

637

High Efficiency Red

HCMS-29x2

270

635

626

Orange

HCMS-29x4

180

600

602

Yellow

HCMS-29x1

180

583

585

Green

HCMS-29x3

270

568

574

Notes:

1. Refers to the initial case temperature of the device immediately before measurement.

2. Measured with all LEDs illuminated.

3. Dominant wavelength,

ld, is derived from the CIE chromaticity diagram and represents the single wavelength, which defines the perceived

LED color.

HCMS-2913 Datasheet(PDF) 6 Page - Broadcom Corporation.

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