SC16458
LED DRIVER IC (10 X 4 SEGMENTS)
DESCRIPTION
SC16458 is an LED controller driven on a 1/6 duty factor. It is
suitable for most application in a lot of consumer products and is
composed of one display memory, ten segment outputs, four grid
outputs and control circuit. The microcomputer often needs this chip
to build a highly reliable peripheral device. A three-line serial interface
is used by SC16458 to get serial data.
FEATURES
SOP-28-375-1.27
* CMOS technology
* Low power consumption
* 8-step dimming circuitry
* Serial interface for clock, data input, strobe pins
ORDERING INFORMATIONS
APPLICATIONS
* Microcomputer peripheral device
Device
Package
SC16458
SOP-28-375-1.27
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS (unless otherwise stated, Tamb=25°C, VSS=0V)
Characteristic
Supply Voltage
Logic Input Voltage
Driver Output Current
Symbol
Value
Unit
VDD
-0.5 to +7
V
VI
-0.5 to VDD+0.5
V
IOLGR
+250
mA
IOHSG
-50
mA
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SC16458
ELECTRICAL CHARACTERISTICS (unless otherwise stated, VDD=5V, VSS=0V, Tamb=25°C)
Characteristics
Symbol
Logic Supply Voltage
Dynamic Current (note)
Max.
Unit
4.5
5
5.5
V
--
--
5
mA
-10
-14
--
mA
-20
-25
--
mA
100
140
--
mA
--
--
±5
%
IOHSG2
IOLGR
Tolerance
Typ.
VDD
High-Level Output Current
Segment High-Level Output Current
Min.
IDDdyn
IOHSG1
Low-Level Output Current
Test Condition
ITOLSG
VO=VDD-1V
SEG1 to SEG10
VO=VDD-2V
SEG1 to SEG10
VO=0.3V, G1 to G5
VO=VDD-1V
SEG1 to SEG10
High-Level Input Voltage
VIH
--
0.7VDD
--
5
V
Low-Level Input Voltage
VIL
--
0
--
0.3VDD
V
Oscillation Frequency
Fosc
R=51kΩ
350
500
650
kHz
Note: test condition: set display control commands=80H (display turn OFF state)
DIN
NC
OSC
VSS
NC
G1
G2
G3
G4
NC
NC
SEG10
SEG9
NC
PIN CONFIGURATIONS
28
27
26
25
24
23
22
21
20
19
18
17
16
15
6
7
8
9
10
11
12
13
14
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
NC
5
SEG1
STB
4
VDD
3
NC
2
NC
1
CLK
SC16458
PIN DESCRIPTIONS
Pin NO.
1
2
3~5, 15, 18,
19, 24, 27
6
7~14, 16~17
20~23
Pin name
CLK
STB
Description
Clock input pin. This pin reads serial data at the rising edge.
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.
NC
No connection
VDD
Logic power supply
SEG1 ~ SEG8,
SEG9~SEG10
Segment output pins (p-channel, open drain)
G4 to G1
Grid output pins (n-channel, open drain)
25
VSS
Ground
26
OSC
28
DIN
Oscillator input pin.
This pin requires a resistor to obtain the accurate oscillation frequency.
Data input pin. This pin inputs serial data at the rising edge of the shift
clock (starting from the lower bits).
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SC16458
FUNCTION DESCRIPTIONS
COMMANDS
After the STB pin changes from “HIGH” to “LOW”, SC16458G will obtain a command via the DIN pin.
Otherwise, the STB pin is set to “HIGH”, the data/commands being transmitted are considered invalid and the
communication is initialized.
Command 1: data setting commands
The data setting commands executes the data write or data read modes for SC16458G. The data setting
command, the bit 5 and bit 6 (b4, b5) are ignored, bit 7 (b6) is given the value of “1” while bit 8(b7) is set the
value “0”. Please refer to the diagram below.
When power is ON, bit 4 to bit 1 (b3 to b0) are set the value of “0”.
MSB
LSB
0 1
-
- b3 b2 b1 b0
Data write & read mode settings:
00: write data to display mode
Not
Relevant
Address increment mode settings (display mode):
0: increment address after data has been written (see note 1)
1: fixes address
Mode settings:
0: normal operation mode
1: test mode
Note: 1. If you want to set bit 3 (b2) to “0”, please remember that DIG5 address cannot be ignored since G5
exists, however, it is not externally bonded. Please refer to command 2, display mode and RAM address
section.
Command 2: address setting commands
The address of the display memory is set by address setting commands. If the address has a value of “00H” to
“09H”, it is considered valid. If the address is set to 0AH or higher, the data is ignored until a valid address is
set. When power is turned ON, the address is set at “00H”.
Please refer to the diagram below.
MSB
LSB
1 1
-
- b3 b2 b1 b0
Not
Relevant
Address: 00H to 09H
Display mode and RAM address
When an external device transmits the serial data into SC16458G, this data is stored in the display RAM and
is assigned addresses. The RAM addresses of SC16458G are given below in 8-bit unit.
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SC16458
SEG1
SEG4 SEG5
SEG8 SEG9
SEG10
00HL
00HU
01HL
DIG1
02HL
02HU
03HL
DIG2
04HL
04HU
05HL
DIG3
06HL
06HU
07HL
DIG4
08HL
08HU
09HL
DIG5
b0
b3
b4
b7
xxHL
xxHu
Lower 4 bits
Higher 4 bits
Command 3: display control commands.
The display control commands are used to turn ON or OFF a display. It also used to set the pulse width.
Please refer to the diagram below. A 1/16 pulse width is selected and the display is turned OFF only when the
power is turned ON.
MSB
LSB
1 0
-
- b3 b2 b1 b0
Not
Relevant
Dimming Quantity Settings:
000: pulse width = 1/16
001: pulse width = 2/16
010: pulse width = 4/16
011: pulse width = 10/16
100: pulse width = 11/16
101: pulse width = 12/16
110: pulse width = 13/16
111: pulse width = 14/16
Display Setings:
0: display OFF
1: display ON
SERIAL COMMUNICATION FORMAT
The following diagram shows the SC16458G serial communication format.
RECEPTION (Data/Command Write)
probably data will continue
STB
DIN
CLK
b0
1
b1
2
b2
3
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b6
7
b7
8
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2004.8.31
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SC16458
SWITCHING CHARACTERISTIC WAVEFORM
SC16458G switching characteristics waveform is given below.
fosc
OSC
50%
PW STB
STB
TCLK-STR
PW CLK PW CLK
CLK
tsetup
thold
DIN
90%
Sn
Gn
10%
tTZH
tTHZ
tTZL
tTLZ
90%
10%
Where:
PWCLK (clock pulse width)≥400ns
PWSTB (strobe pulse width) ≥ 1μs
tsetup (data setup time) ≥ 100ns
thold (Data hold time) ≥ 100ns
tclk-STB (clock strobe time) ≥ 1μs
tthz (fall time)≤10μs
ttzh (rise time) ≤1μs
FOSC= oscillation frequency
tTZL<1μs
ttlz <10μs
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SC16458
APPLICATIONS
Display memory is update by incrementing addresses. Please refer to the following diagram.
STB
CLK
DIN
Command1
Command2
Data 1
Data n
Command3
Where: Only when "STB" is low , the "CLK" signal is valid.
Command 1: Data Setting Command
Command 2: Address Setting Command
Data 1 to n: Transfer Display Data (10 Bytes max.)
Command 3: Display Control Command
The following diagram shows the waveforms when updating specific addresses.
STB
CLK
DIN
Command1
Command2
Data
Command2
Data
Where: Only when "STB" is low , the "CLK" signal is valid.
Command 1--Data Setting Command
Command 2-- Address Setting Command
Data-- Display Data
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SC16458
RECOMMENDED PROGRAMMING FLOWCHART
START
SET DATA
SET
ADDRESS
Clear Display RAM
(see Note)
INITIAL
SETTING
SET
DISPLAY
Display ON
("10xx1xxx")
MAIN
PROGRAM
SET DATA
SET
ADDRESS
MAIN
LOOP
SET
DISPLAY
Display ON
("10xx1xxx")
END
Note: When IC power is applied for the first time, the contents of the display RAM are not defined; thus, it
is strongly suggested that the contents of the display RAM must be cleared during the initial setting.
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SC16458
TYPICAL APPLICATION CIRCUIT
0.1μF
MCU
SEG10
SEG8
COMMON CATHODE
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
DIGIT4
DIGIT3
DIGIT2
DIGIT1
DIN 28
2 STB
NC 27
3 NC
OSC 26
4 NC
VSS 25
S9
5 NC
NC 24
S8
6 VDD
G1 23
S10
S7
S6
S1
S5
S2
S4
S3
S3
S4
S2
S1
S5
S6
G4
S7
G3
G2
51K
+5V
S8
SC16458
4-GRID X 10-SEGMENTNT LED
SEG9
1 CLK
7 SEG1
8 SEG2
G1
G2
G2 22
G3
G3 21
G4
9 SEG3
G4 20
10 SEG4
NC 19
11 SEG5
NC 18
12 SEG6
SEG10 17
S10
13 SEG7
SEG9 16
14 SEG8
NC 15
S9
G1
Note: the capacitor (0.1μF) connected between the GND and VDD pins must be located as near as possible to
the SC16458 chip.
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
a
COM / DIGITAL (GRID)
b
c
f
d
e
g
e
g
b
c
f
h
d
h
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a
REV:1.2
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SC16458
PACKAGE OUTLINE
SOP-28-375-1.27
UNIT: mm
1.27
0.15±0.05
0.45
17.75±0.25
16.51
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against
electrostatic discharge but they can be damaged if the following precautions are not taken:
• Persons at a work bench should be earthed via a wrist strap.
• Equipment cases should be earthed.
• All tools used during assembly, including soldering tools and solder baths, must be earthed.
• MOS devices should be packed for dispatch in antistatic/conductive containers.
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2004.8.31
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