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SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
GENERAL DESCRIPTION
The SM16705P/F/FN are specifically designed for LED display constant current drivers. This constant current output circuits is able to setup by external resistor (IOUT = 5 ~ 90mA). This IC is monolithic integrated circuit designed to be used together with Bi-CMOS process. The devices consist of 8bit shift register, latch, ANDGATE and Constant Current Drivers.
FEATURES
* Constant Current Output : can setup all output current with one resistor for 5 to 90mA. * Maximum Clock Frequency : fCLK = 25 (MHz) (Cascade Connect Operate, Topr = 25oC) * 5V CMOS Compatible Input * 16 pin DIP, SOP or SSOP package * Constant Output Current Matching : Output-GND Voltage 0.4V 0.7V Current Matching 6.0% 6.0%
Output Current 5 ~ 40mA 5 ~ 90mA
PIN ASSIGNMENTS
GND SERIAL-IN CLOCK LATCH OUT0 OUT1 OUT2 OUT3
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VDD R-EXT SERIAL-OUT ENABLE OUT7 OUT6 OUT5 OUT4
Part Number SM16705P SM16705F SM16705FN
Package Type 16pin DIP 16pin SOP 16pin SSOP
SM16705
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
PIN DESCRIPTION
Pin NO. 1 2 3 I I I/O Pin Name GND SERIAL-IN CLOCK GND terminal Terminal of serial-data input to the shift register. Input terminal of a clock for shift register on rising edge. Input terminal of data strobe. Latches pass data with "H" level input of LATCH-terminal, and hold data with "L" level input. Current-sinking output terminals. Input terminal of output enable. All outputs (OUT0~7) do off with "H" level input of ENABLE-terminal and do on with "L" level input. Output terminal of serial-data for next SERIAL-IN terminal. An external resistor at this terminal establishes all of the output current. 5V supply voltage terminal. Function Description
4
I
LATCH
5~12
O
OUT0~7
13
I
ENABLE
14 15 16
O I/O
SERIAL-OUT R-EXT VDD
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
TRUTH TABLE
CLOCK UP UP UP DOWN DOWN LATCH H L H X X ENABLE L L L L H SERIAL-IN Dn Dn + 1 Dn + 2 Dn + 3 Dn + 3 OUT0 ... OUT5 ... OUT7 Dn ... Dn - 5 ... Dn - 7 No change Dn + 2 ... Dn - 3 ... Dn - 5 Dn + 2 ... Dn - 3 ... Dn - 5 Off SERIAL-OUT Dn - 7 Dn - 6 Dn - 5 Dn - 5 Dn - 5
Note : 1.OUT0~7=on when Dn="H" ; OUT0~7=off when Dn="L". 2. In order to ensure that the level of the power supply voltage is correct, an external resistor must be connected betwen R-EXT and GND.
EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS 1. ENABLE terminal
VDD
RIN(Up)
2. LATCH terminal
VDD
ENABLE
LATCH
RIN(Down)
GND
GND
3. CLOCK, SERIAL-IN terminal
VDD CLOCK, SERIAL-IN GND
4. SERIAL-OUT terminal
VDD
SERIAL-OUT
GND
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
BLOCK DIAGRAM
OUT0 R-EXT I-REG. OUT1 OUT7
ENABLE
Q ST D Q ST D Q ST D
LATCH SERIAL-IN CLOCK
DQ CK DQ CK DQ CK
SERIALOUT
TIMING DIAGRAM
CLOCK SERIAL-IN LATCH ENABLE OUT0 OUT1 OUT2 OUT7 SERIAL-OUT .....
5V 0V 5V 0V 5V 0V 5V 0V On Off On Off On Off On Off 5V 0V
Note : Latches are level sensitive, not rising edges sensitive and not synchronous CLOCK. Input of LATCH-terminal to H Level, data passes latches, and input of LATCH -terminal to L level, data hold latches. Input of ENABLE-terminal to H Level, all output (OUT0 ~ 7) do off.
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
MAXIMUM RATINGS (Ta = 25oC)
Characteristic Supply Voltage Input Voltage Output Current Output Voltage Clock Frequency GND Terminal Current Power Dissipation Thermal Resistance Operating Termerature Storage Temperature (Note) Symbol VDD VIN IOUT VOUT fCLK IGND PD Rth (j-a) Topr Tstg Rating 0 ~ 7.0
SM16705P/F/FN
Unit V V mA V MHz mA W
oC
- 0.4 ~ VDD +0.4 90 - 0.5 ~ 20.0 25 720 1.47 (DIP : FREE AIR, Ta = 25oC) 0.78 (SOP/ SSOP : ON PCB, Ta = 25oC) 85 (DIP : FREE AIR, Ta = 25oC) 160 (SOP/ SSOP : ON PCB, Ta = 25oC) -40 ~ 85 -55 ~ 150
/W
oC oC
DIP : Ambient temperature derated above 25oC in the proportion of 11.8mW / oC SOP/ SSOP: Ambient temperature delated above 25oC in the proportion of 6.3mW / oC
RECOMMENDED OPERATING CONDITION (Ta = -40 ~ 85oC unless otherwise noted)
Characteristic Supply Voltage Output Voltage Output Current Symbol VDD VOUT IO IOH IOL VIH Input Voltage VIL LATCH Pulse Width CLOCK Pulse Width ENABLE Pulse Width Set-up Time for DATA Hold Time for DATA Set-up Time for LATCH Clock Frequency Power Dissipation tw LAT tw CLK tw EN tsetup(D) thold (D) tsetup(L) fCLK PD Condition OUTn,DC test circuit SERIAL-OUT SERIAL-OUT Min. 4.5 5 0.7 VDD -0.3 20 20 2000 20 20 20 Typ. 5.0 Max. 5.5 15.0 88 1.0 -1.0 VDD +0.3 0.3 VDD 25 0.82 0.40 Unit V V mA
V ns ns ns ns ns ns MHz W
VDD = 4.5 ~ 5.5V
Cascade operation Ta = 85oC(DIP FREE AIR) Ta = 85oC (SOP/ SSOP ON PCB)
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
ELECTRICAL CHARACTERISTICS (VDD = 5.0V, Ta = 25oC unless otherwise noted)
Characteristic
Symbol
Condition
Min. 0.7 VDD GND
Typ.
Max.
Unit
Input Voltage
"H" Level "L" Level
VIH VIL

VDD 0.3 VDD 10 V
Output Leakage Current
IOH
VOH = 15.0V
A
Output Voltage
VOL SERIAL-OUT VOH IOL1
IOL = 1.0mA IOH = -1.0mA VCE = 0.7V VCE = 0.4V IOUT = 40mA VCE = 0.4V REXT = 470 (Include skew) REXT = 470
4.6 34.1 33.7
40.0 39.5 1.5
0.4 V 45.9 45.3 4.0
Output Current 1
IOL2 IOL1
mA
Current Skew
%
Output Current 2
IOL3
VCE = 0.7V IOUT = 75mA VCE = 0.7V
REXT = 240
66.3
78.0
89.7
mA
Current Skew
IOL2
REXT = 240
1.5
4.0
%
Supply Voltage Regulation
% / VDD
REXT = 470, Ta = -40 ~ 85oC
2.5
5.0
%/V
Pull-Up Resistor Pull-Down Resistor
RIN (up) RIN (down) IDD (off) 1 "OFF" IDD (off) 2 IDD (off) 3 IDD (on) 1 "ON" VDD (on) 2
REXT =OPEN, OUT0 ~ 7 = off REXT =470, OUT0 ~ 7 = off REXT =240, OUT0 ~ 7 = off REXT =470, OUT0 ~ 7 = on REXT =240, OUT0 ~ 7 = on
150 100 3.5 6.5 7.0 10.0
300 200 0.6 5.0 8.0 8.0 15.0
600 400 1.2 8.0 15.0 18.0 32.0
K K
Supply Current
mA
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
SWITCHING CHARACTERISTICS (Ta = 25 oC unless otherwise noted)
Characteristic SERIAL-IN-OUTn Propagation Delay Time ("L" to "H") LATCH-OUTn
Symbol
Condition
Min.
Typ. 400 400 400 20 200 200 200 20 300 300
Max. Unit 800 800 ns 800 40 400 400 ns 400 40 600 ns 600
tpLH ENABLE-OUTn CLOCK -SERIAL-OUT SERIAL-IN-OUTn VDD = 5.0V REXT = 470 VL = 3.0V RL = 62 tpHL ENABLE-OUTn CLOCK -SERIAL-OUT CL = 10 pF tor tof 150 150
Propagation Delay Time ("H" to "L")
LATCH-OUTn
Output Rise Time Output Fall Time
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
TEST CIRCUIT
DC Characteristic IDD VDD ENABLE IIL,IIH CLOCK LATCH VIL,VIH SERIAL-IN R-EXT lref GND OUT7 SERIAL-OUT
OUT0 IOL
AC Characteristic
VDD ENABLE VIL,VIH SWMATRIX CLOCK LATCH SERIAL-IN R-EXT GND
RL OUT0 CL OUT7 SERIAL-OUT CL VL
PRECAUTIONS FOR USING
Utmost care is necessary in the design of the output line, VDD and GND line, since IC may be destroyed due to short-circuit between outputs, air contamination fault, or fault by improper grounding.
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
TIMING WAVEFORM
1. CLOCK, SERIAL-IN, SERIAL-OUT, OUTn
tr tw CLK 90% 50% 10% tsetup(D) 50% thold(D) 50% tor 90% 50% 10% tpLH tpHL tof 90% 50% 10% tf tw CLK 90% 50% 10% 50%
CLOCK
SERIAL-IN
SERIAL-OUT, OUTn (current)
2. CLOCK-LATCH
50% 50%
CLOCK
SERIAL-IN
"L" level = DATA HOLD
50% 50%
LATCH
tW LAT tsetup(L)
3. ENABLE-OUTn
tW EN
ENABLE
50% tpLH 50% 50% tpHL 50%
OUTn (Current)
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
Output Current - Duty (LED turn-on rate)
SM16705P/F/FN
Output Current - REXT Resistor
Ta - PD
1.6
100 90 P FREE AIR 80
REXT - IOUT
Power dissipation PD (W/IC)
1.4 1.2 1 0.8 0.6 0.4 0.2
IOUT ( mA )
70 60 50 40 30 20 10 0
IOUT {(1.25 / REXT ()} x 14.7 VOUT = 0.7V VDD = 5.0V
F/FN ON PCB
F/FN FREE AIR
0 -40
-20
0
20
40
60
80
200 300
500
1,000
2,000 3,000 5,000
Ambient Temerature Ta (oC)
REXT ()
Fig. 1
Output Current - Output Voltage
Vce-Ice
0.09 0.08 0.07 0.06 0.05 R=470 R=240
Ice
0.04 0.03 0.02 0.01 R=3900 0 -0.01 0 0.5 1 1.5 2 2.5 3 3.5
Vce
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V2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
[1] Output Current (IOUT)
IOUT is set by the enternal resistor (R-EXT) as shown in Firgure1.
[2] Total supply voltage (VLED)
This device can operate at 0.4~0.7V (VOUT). When a higher voltage is input to the device, the excess voltage is consumed inside the device, that leads to more power dissipation. In order to minimize power dissipation and loss, we would like to recommend to set the total supply voltage as shown below, VLED (total supply voltage)=VOUT (IC Supply Voltage)+ Vf (LED Forward voltage) + VDS (MOSFET Voltage Drop) When the total supply is too high considering the power dissipation of this device, an additional R can decrease the supply voltage (VOUT).
PATTERN LAYOUT
VDD
SCAN VDD VDD
VLED = 3 ~ 4 (V)
SDM4952 SDM4953 VDS SDM9435A Vf OUT0 VOUT OUT7 GND SERIAL-OUT
ENABLE CLOCK LATCH SERIAL-IN R-EXT CPU
VDD ENABLE CLOCK LATCH SERIAL-IN R-EXT VDD OUT0 VOUT OUT7 GND SERIAL-OUT Vf
[3] Pattern Layout
This device has only one ground pin that means signal ground pin and power ground pin are common. If ground pattern layout contains large inductance and impedance, and the voltage between ground and LATCH, CLOCK terminals exceeds 2.5V by switching noise during operation, this device may missoperate. So we would advise you to pay attention to pattern layout to minimize ground inductance.
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
PACKAGE OUTLINE
SM16705P 16 PIN DIP Unit : mm 16 9 6.35 + 0.13 0 ~ 15 3.3 + 0.1 5.33MAX 0.38MIN 3.3 + 0.508 9.02 + 0.508 7.62
1
8
19.69 MAX 19.18 + 0.51
0.635 + 0.254
2.54
1.524
0.4572
Weight: 1.11g(Type)
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
PACKAGE OUTLINE
SM16705F 16 PIN SOP 16 9 4.0MAX 6.2MAX Unit : mm
1
8
0.56
1.27
0.51
10
1.75
1.5
0.25
0.25
1.27
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V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
8-BIT CONSTANT CURRENT LED DRIVER
SM16705P/F/FN
PACKAGE OUTLINE
SM16705FN 16 PIN SSOP Unit : mm 16 9
3.91 1 8 0.229 0.635 0.3MAX 4.9 1.5 1.63MAX
5.99 0.254
0.15
0.635
Page 14
V.2.0 MAY,2003

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