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SC6928(文件编号：S&CIC0311)

LED Driver IC

DESCRIPTION
SC6928 is an LED Controller driven on a 1/7to 1/8 duty factor. Eleven segment output lines, six grid output lines, 1
segment/grid output lines, one display memory, control circuit , key scan circuit are all incorporated into a single chip to build a
highly reliable peripheral device for a single chip microcomputer. Serial data is fed toSC6928 via a four-line serial interface.
Housed in a 28-pin SO Package, SC6928 pin assignments and application circuit are optimized for easy PCB Layout and cost
saving advantages.
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FEATURES
CMOS Technology
Low Power Consumption
Multiple Display Modes
Key Scanning
8-Step Dimming Circuitry
Serial Interface for Clock, Data Input, Data Output, Strobe Pins
Available in28-Pin, SOP Package

APPLICATION
Micro-computer Peripheral Device
VCR set
Combi set

BLOCK DIAGRAM

Control
Serial
DI/O
CLK
STB

Data
Interface

Dispaly Memory
SEGMENT DRIVER/
KEY SCAN OUTPUT/

OSC

OSC

Timing Generator

GRID DRIVER

R
Key Matrix
Memory
GND

Dimming Circuit

K1

K2

VDD GND

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SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
SG12/GR7
SG13/GR6
SG14/GR5
GR4
GR3
GR2
GR1

SC6928(文件编号：S&CIC0311)

LED Driver IC

INPUT/OUTPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below.
Input Pins: CLK, STB & DIN
VDD

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GND

Input Pins: K1 to K2
VDD

GND

Output Pins: DOUT, GR1 to GR4
VDD

GNDOutput Pins: SG1 to SG10
VDD

GND

Output Pins: GR5, GR6 and SG12/GR7
VDD

GND

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SC6928(文件编号：S&CIC0311)

LED Driver IC

PIN CONFIGURATION

OSC
DI/O
CLK
STB
K1
K2
VDD
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7

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1
2
3
4
5
6
7
8
9
10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

GNDGR1
GR2
GND
GR3
GR4
GND
VDD
SG14/GR5
SG13/GR6
SG12/GR7
SG10/KS10
SG9/KS9
SG8/KS8

IC:SC6928

PIN DESCRIPTION
Pin Name

I/O

OSC

I

DI/O
CLK

Description

Pin No.

Oscillator Input Pin
A resistor is connected to this pin to determine the oscillation frequency

1

I/O

Data Output Pin ( N-Channel, Open-Drain ) or Data Input pin
This pin Outputs/Input serialdata at the falling(rising) edge of the shift clock.

2

I

Clock Input Pin
This pin reads serial data at the rising edge and outputs data at the falling edge.

3

STB

I

Serial Interface Strobe Pin
The data input after the STB has fallen is processed as a command
When this pin is “HIGH”, CLK is ignored.

4

K1 to K2

I

Key Data Input Pins. The data sent to these pins arelatched at the end of the display
cycle. ( Internal Pull-Low Resistor)

GND

-

Ground Pin

SG1/KS1 to
SG10/KS10

O

Segment Output Pins ( p-channel, open drain )
Also acts as the Key Source

SG12/GR7
toSG14/GR5

O

VDD

-

Power Supply

GR4 to GR1

O

Grid Output Pins

5,6
22,25,28

Segment/Grid Output Pins

8~17
18~20
7,21
23,24,26,27

FUNCTIONALDESCRIPTION
COMMANDS
A command is the first byte ( b0 to b7 ) inputted to SC6928 via the DIN Pin after STB pin has changed from HIGH to
LOW Stage. If for some reason the STB Pin is set to HIGH while data or commands are being transmitted, the serial
communications is initialized, and the data/commands being transmitted are considered invalid.

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SC6928(文件编号：S&CIC0311)

LED Driver ICCommand 1: Display Mode Setting Commands
SC6928 provides 2 display mode settings as shown in the diagram below: As stated earlier a command is the first one byte
( b0 to b7 ) transmitted to SC6928 via the DIN Pin when STB is LOW. However, for these commands, the bit 3 to bit 6 (b2 to
b5) are ignored, bit 7 & bit 8 (b6 to b7) are given value of 0.
The Display Mode Setting Commands determine...