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
* CMOS technology
* Low power consumption
* 8-step dimming circuitry
* Serial interface for clock, data input, strobe pins
SOP-28-375-1.27
APPLICATIONS
* Microcomputer peripheral device
ORDERING INFORMATIONS
Device
SC16458
Package
SOP-28-375-1.27
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
(unless otherwise stated, T
amb
=25°C, V
SS
=0V)
Characteristic
Supply Voltage
Logic Input Voltage
Driver Output Current
Symbol
V
DD
V
I
I
OLGR
I
OHSG
Value
-0.5 to +7
-0.5 to V
DD
+0.5
+250
-50
Unit
V
V
mA
mA
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2004.8.31
Page 1 of 10
SC16458
ELECTRICAL CHARACTERISTICS
(unless otherwise stated, V
DD
=5V, V
SS
=0V, T
amb
=25°C)
Characteristics
Logic Supply Voltage
Dynamic Current (note)
Symbol
V
DD
I
DDdyn
I
OHSG1
High-Level Output Current
I
OHSG2
Low-Level Output Current
Segment High-Level Output Current
Tolerance
High-Level Input Voltage
Low-Level Input Voltage
Oscillation Frequency
I
OLGR
I
TOLSG
V
IH
V
IL
Fosc
V
O
=V
DD
-1V
SEG1 to SEG10
V
O
=V
DD
-2V
SEG1 to SEG10
V
O
=0.3V, G1 to G5
V
O
=V
DD
-1V
SEG1 to SEG10
--
--
R=51kΩ
Test Condition
Min.
4.5
--
-10
-20
100
--
0.7V
DD
0
350
Typ.
5
--
-14
-25
140
--
--
--
500
Max.
5.5
5
--
--
--
±5
5
0.3V
DD
650
Unit
V
mA
mA
mA
mA
%
V
V
kHz
Note: test condition: set display control commands=80H (display turn OFF state)
PIN CONFIGURATIONS
SEG10
SEG9
16
13
SEG7
OSC
DIN
V
SS
NC
NC
NC
NC
28
27
26
25
24
23
22
21
20
19
18
17
SC16458
1
CLK
2
STB
3
NC
4
NC
5
NC
6
V
DD
7
SEG1
8
SEG2
9
SEG3
10
SEG4
11
SEG5
12
SEG6
14
SEG8
PIN DESCRIPTIONS
Pin NO.
1
2
3~5, 15, 18,
19, 24, 27
6
7~14, 16~17
20~23
25
26
28
Pin name
CLK
STB
NC
V
DD
SEG1 ~ SEG8,
SEG9~SEG10
G4 to G1
V
SS
OSC
DIN
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.
No connection
Logic power supply
Segment output pins (p-channel, open drain)
Grid output pins (n-channel, open drain)
Ground
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).
REV:1.2
2004.8.31
Page 2 of 10
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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NC
15
G1
G2
G3
G4
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
0 1
-
LSB
- b3 b2 b1 b0
Data write & read mode settings:
00: write data to display mode
Address increment mode settings (display mode):
0: increment address after data has been written (see note 1)
1: fixes address
Not
Relevant
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
1 1
-
LSB
- b3 b2 b1 b0
Address: 00H to 09H
Not
Relevant
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.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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REV:1.2
2004.8.31
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SC16458
SEG1
00HL
02HL
04HL
06HL
08HL
b0
xxHL
Lower 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
1 0
-
LSB
- b3 b2 b1 b0
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
SEG4 SEG5
00HU
02HU
04HU
06HU
08HU
b3
SEG8 SEG9
SEG10
01HL
03HL
05HL
07HL
09HL
DIG1
DIG2
DIG3
DIG4
DIG5
b4
xxHu
b7
Higher 4 bits
Not
Relevant
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
b6
7
b7
8
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2004.8.31
Page 4 of 10
SC16458
SWITCHING CHARACTERISTIC WAVEFORM
SC16458G switching characteristics waveform is given below.
fosc
OSC
50%
PW
STB
STB
PW
CLK
PW
CLK
CLK
t
setup
DIN
t
hold
T
CLK-STR
90%
10%
tTZH
tTZL
Gn
90%
10%
tTHZ
tTLZ
Sn
Where:
PWCLK (clock pulse width)≥400ns
t
setup
(data setup time)
≥
100ns
t
clk-STB
(clock strobe time)
≥
1μs
t
tzh
(rise time)
≤1μs
t
TZL
<1μs
PWSTB (strobe pulse width)
≥
1μs
t
hold
(Data hold time)
≥
100ns
t
thz
(fall time)≤10μs
F
OSC
= oscillation frequency
t
tlz
<10μs
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2004.8.31
Page 5 of 10
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