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MITSUBISHI DIGITAL ASSP MITSUBISHI DIGITAL ASSP
M66503ASP/AGP M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH 16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
DESCRIPTION The M66503A is a constant current LED driver IC, whose output current is variable. The IC's functions include 16-bit serial input/parallel output shift register with output latch. The product uses Bi-CMOS process for highly accurate constant current driving, permitting high-efficiency LED driving without using a resistor that limits LED current. Settings for the LED drive current are made by an external resister, thereby ensuring a maximum output current of 30 mA, enough for anode-common LED driving. Furthermore, the pin configuration of the IC permits easier wiring on a printed board. FEATURES * Anode-common LED driving * Constant current output: Set to a value within a range between 0 and 30mA with an external resistor only. Simultaneous lighting available. * Pins (OEA, OEB) provided for forced ON/OFF of LED drive current. * Greater noise margin: Total-input Schmitt circuit is employed to deal with longer wire lengths. * Input/output CMOS compatible * Serial data output provided (SQ15) * 5V single power supply * Pin configuration for easier wiring on printed board APPLICATION LED array drivers for display panel and printer. Other various LED modules. FUNCTION The M66503A is a constant current LED driver for anodecommon LEDs. To set the LED driving current, an external resistor is connected between the current setting input pin, RC, and GND. In this way it is possible to set a highly accurate drive current. Each bit of the shift register is made up of a flip-flop performing shift function and a latch connected to the output. When the clock input pin, CKS, goes from "L" to "H", data is shifted. Serial data is entered to the shift register via the serial data input pin, A. Data on A is straight shifted. By turning the latch enable input pin, LE, to "L", the contents stored in the shift register is latched. All outputs are turned off if the output enable input pins, OEA and OEB, are simultaneously set to "L". This function is useful for the prevention of an excessive current flowing at the moment of power on. All outputs are turned on if the OEA pin is set to "H". This enables to check LEDs for failure. In these actions, changing the state of OEA and/or OEB does not affect the shift function. To expand the number of bits, link the M66503A in serial using the serial data output pin, SQ15, which is the serial data output of the shift register.
PIN CONFIGURATION (TOP VIEW)
GND1 SERIAL DATA INPUT A SHIFT CLOCK INPUT CKS LATCH ENABLE LE INPUT NC PARALLEL DATA OUTPUT Q0 Q1 Q2 PARALLEL DATA OUTPUT Q3 Q4 Q5 GND3 PARALLEL DATA OUTPUT Q6 Q7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
M66503ASP
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
VCC RC CURRENT SETTING INPUT SQ15 SERIAL DATA OUTPUT OEA OUTPUT ENABLE INPUT A OEB OUTPUT ENABLE INPUT B Q15 Q14 GND5 Q13 Q12 Q11 Q10 GND4 Q9 Q8 PARALLEL DATA OUTPUT PARALLEL DATA OUTPUT PARALLEL DATA OUTPUT
GND2
Outline 30P4B GND1 SERIAL DATA INPUT A SHIFT CLOCK INPUT CKS LATCH ENABLE LE INPUT NC NC Q0
PARALLEL DATA OUTPUT
1 2 3 4 5 6 7
M66503AGP
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
VCC RC CURRENT SETTING INPUT SQ15 SERIAL DATA OUTPUT OEA OUTPUT ENABLE INPUT A OEB OUTPUT ENABLE INPUT B NC Q15 Q14 Q13 Q12 GND3 Q11 Q10 NC NC NC Q9 Q8
PARALLEL DATA OUTPUT
Q1 Q2 Q3
8 9 10 11 12 13 14 15 16 17 18
PARALLEL DATA OUTPUT
GND2
PARALLEL DATA OUTPUT
Q4 Q5 NC NC NC Q6 Q7
PARALLEL DATA OUTPUT
PARALLEL DATA OUTPUT
Outline 36P2R-D NC: No Connection
1
2 PARALLEL DATA OUTPUT (Note 1) Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 SQ15 SERIAL DATA OUTPUT 1 D LE D LE D LE D LE D LE D LE D LE D LE D LE D LE 1 1 1 1 1 1 1 1 1 1 D LE 1 D LE 1 D LE 1 D CK D CK D CK D CK D CK D CK D CK D CK D CK 1 1 1 1 1 1 1 1 1 D CK 1 D CK 1 D CK 1 D CK VCC GND1 GND2 GND3 GND4 GND5 (Note 2) Note 1: Output current is approximated by the following equation. IO(Qn) =5 * VCC/(2 * RC+100) 2: GND 1 : for internal digital circuits GND 2-5: for internal analog circuits CKS LE SHIFT CLOCK LATCH ENABLE INPUT INPUT
BLOCK DIAGRAM
Q0
Q1
Q2
1
2
1
1
1
D LE
D LE
D LE
1
1
1
D CK
D CK
D CK
RC
OEA
OEB
A
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
CURRENT SERIAL DATA SETTING OUTPUT ENABLE INPUT INPUT INPUT 1: constant current driver 2: Regulator
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
FUNCTION TABLE (Note 3)
CKS X X X LE H H L X X Input A OEA H L L L X L L L H H OEB H H H L X Q0 L Z Q00 Z L Q1 Q00 Q00 Q10 Z L Q2 Q10 Q10 Q20 Z L Q3 Q20 Q20 Q30 Z L Q4 Q30 Q30 Q40 Z L Parallel output Q5 ********************************** Q40 ********************************** Q40 ********************************** Q50 ********************************** Z ********************************** L ********************************** Q12 Q13 Q14 Q15 Q110 Q120 Q130 Q140 Q110 Q120 Q130 Q140 Q120 Q130 Q140 Q150 Z Z Z Z L L L L Serial output SQ15 q140 q140 q15 q15 q15
Note 3: : Denotes change from "L" to "H". Q0 : Denotes state of Q output before change in CKS input. x : Either "L" or "H" q0 : Contents of shift register before change in CKS input q : Contents of shift register z : Denotes high impedance state
PIN DESCRIPTION
Pin A CKS LE OEA OEB SQ15 RC Qn VCC GND1 GND2~5 Name Serial data input pin Shift clock input pin Latch enable input pin Output enable input pins Serial data output pin Current setting input pin LED connection pins. Power supply pin GND pin 1 GND pins 2-5 Input/Output Input Input Input Input Description Shift register's serial data input pin. Clock input pin. Shifts data at leading edge. If "H", contents in shift register appear at output Qn, and if "L", contents in shift register are latched. Output enable input pins. If OEA ="H", all outputs, Qn, are turned on. If OEA ="L" and OEB ="L", all outputs, Qn, are turned off. Serial data output pin of shift register Connect a resistor between the RC pin and GND to set the driving current. Driver output pins. Connect LED's cathodes to these pins. Connect to positive power source (+5V). GND for internal digital circuits. GND for internal analog circuits.
Output Input Output
3
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
OPERATION 1. LED Drive Current Settings The M66503A has an internal power supply, which provides a constant current to each bit output. The output value of the constant current is set by means of a load resistor, RC,connected between the RC pin and GND and is approximated by the equation below. IO (Qn) =5*VCC/(2*RC +100) 2. Switching Operation If the output data of the latch is "H", LED lights up. The value of the LED drive current is IO(Qn). If the output data of the latch is "L", LED goes off, and the LED drive current becomes nearly zero, irrespective of the value of IO(Qn). 3. How to Use the OEA and OEB Inputs If OEA = "L" and OEB = "L", all output currents are turned off. Accordingly, it is possible to prevent a large current from flowing through LESs by, for example, fixing both OEA and OEB to "L" until VCC, after turned on, reaches a steady state. If OEA ="H", all output currents turn on. This function facilitates the checking of LEDs for failure. When OEA ="L" and OEB ="H", each output current turns on and off according to the output data of the latch. 4. VCC and GND Pins Pins related to the power supply function are VCC and GNDs 1-5 (GNDs 1-3 for the M66503AGP). The role of these pins in terms of the internal circuits are as follows. : commonly used by both digital and VCC analog circuits GND 1 : used by digital circuits GNDs 2-5 (2-3) : used by analog circuits In practical wiring, the following should be noted. (1) Secure as much width as possible for conductors and avoid lengthy wiring. (2) Allocate electrolytic capacitors for stable voltage near VCC and GNDs 2-5 (2-3). (3) Allocate by-pass capacitor near VCC and GND1.
4
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
ABSOLUTE MAXIMUM RATINGS (Ta = -20 ~ 85C unless otherwise noted)
Symbol VCC VI VO IO Pd Tstg Parameter Supply voltage Input voltage Output voltage Q0~15 Output current SQ15 Power dissipation Storage temperataure Conditions Ratings -0.3 ~ +7.0 -0.3 ~ VCC + 0.3 -0.3 ~ + 15.0 30 10 1.74 1.70 -65 ~ 150 Unit V V V mA W C
M66503ASP Measured being mounted Ta=25C(Note 4) M66503AGP Measured being mounted Ta=25C(Note 5)
Note 4. When 7a 25C,derate by 13.9mW/C Note 5. When 7a 25C,derate by 13.6mW/C
RECOMMENDED OPERATIONAL CONDITIONS
Symbol VCC VI VO IO Topr Parameter Supply voltage Input voltage Output voltage Output current Q0~Q15 Operational ambient temperature Conditions Min. 4.5 0 0 -20 Limits Typ. 5 Max. 5.5 VCC VCC 30 85 Unit V V V mA C
IO(Qn)=30mA, VO(Qn)=0.8V
ELECTRICAL CHARACTERISTICS (VCC =5V 10% and Ta = -20 ~ 85C, unless otherwise noted)
Symbol VT+ VT- VOH VOL IOZ IIH IIL IO IO Parameter Positive-going threshold voltage Negative-going threshold voltage "H" Output voltage "L" Output voltage OFF-state output current "H" Input current "L" Input current Output current Test conditions VO=0.1V, VCC-0.1V |IO|=20A VO=0.1V, VCC-0.1V |IO|=20A VCC=5.0V, IOH=-0.4mA VCC=5.0V, IOL=1.6mA VO(Qn)=VCC VCC=5.5V, VI=VCC VCC=5.5V, VI=GND VO(Qn)=0.8V VCC=5.0V, VO(Qn)=1.0V Iref=-6mA Iref=0mA Iref=-6mA VCC=5.5V Iref=-6mA Min. 0.35xVCC 0.2xVCC 4.0 0.5 10 5 -5 30 3.5 6.0 5 23 30 Limits Typ. Max. 0.7xVCC 0.55xVCC Unit V V V V A A A mA %
SQ15 SQ15
Output current bit-to-bit error All outputs OFF All outputs ON
ICC
Supply current
mA
5
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
TIMING CONDITIONS (VCC=5V 10%, Ta=-20 ~ 85C)
Symbol tw tsu(A) tsu(LE) th(A) tr, tf Parameter CKS, LE pulse width Address setup time to CKS LE setup time to CKS Address hold time to CKS CKS rise and fall time Test conditions Min. 30 20 40 10 Limits Typ. Max. Unit ns ns ns ns s
(Note 6)
2
SWITCHING CHARACTERISTICS (VCC=5V 10%, Ta=-20 ~ 85C)
Symbol fmax tPLZ tPZL tPLH tPHL tPLZ tPZL tPLZ tPZL tPLZ tPZL Parameter Maximum frequency for repetitions CKS-Q0~15(off) "L-H" and "Z-L" outputs propagation time CKS-Q0~15(on) "L-H" and "H-L" outputs propagation time "L-Z" and "Z-L" outputs propagation time "L-Z" and "Z-L" outputs propagation time "L-Z" and "Z-L" outputs propagation time CKS-SQ15 LE-Q0~15(off) LE-Q0~15(on) OEA-Q0~15(off) OEA-Q0~15(on) OEB-Q0~15(off) OEB-Q0~15(on) CL=50pF RL=100 (Note 6) Test conditions Min. 5 Limits Typ. Max. 250 250 250 250 250 250 250 250 250 250 Unit MHz ns ns ns ns ns ns ns ns ns ns
NOTE 6: TEST CIRCUIT
Input VCC VCC
RL=100 (1) DUT P.G. lref 50 SQ15 RC RC= 360 (2) CL=50pF (2) CL=50pF Q0~15
(1) Characteristics of pulse generator (PG) Rise time : tr = 6ns Fall time : tf = 6ns Output impedance : ZO =50 (2) Capacitance CL includes the stray capacitance of the lead wires and the probe input capacitance.
6
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
TIMING CHARTS
tr tw CKs 50% 50% tsu A th 50% 50% tPLH SQ15 tPHL VOH 50% tPZL Q0~15 50% 50% VOL (ON) tPLZ VOH (OFF) 50% VOL tsu tw 90% 50% 10% th VCC GND 10% 90% VCC GND tf
50%
VCC CKs 50% GND tsu LE 50% 50% tPLZ VOH (OFF) Q0~15 50% tPZL Q0~15 50% VOH (OFF) VOL (ON) VOL (ON) GND tw VCC
OEA
50% 50%
VCC GND
VCC OEB 50% 50% GND tPLZ Q0~15 tPZL 50% 50% 50% tPLZ tPZL 50% VOH (OFF) VOL (ON)
7
MITSUBISHI DIGITAL ASSP
M66503ASP/AGP
16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH
TYPICAL CHARACTERISTICS
OUTPUT CURRENT VS REFERENCE CURRENT CHARACTERISTICS (Q0 ON) 50 40 30 20 10 0 VCC=5V Ta=25C VO=0.8V OUTPUT CURRENT VS OUTPUT VOLTAGE CHARACTERISTICS 50 40 30 20 10 0 VCC=5V Ta=25C lref=-5.4mA
Q0 OUTPUT CURRENT IO (mA)
Q0 OUTPUT CURRENT IO (mA)
0
-4 -8 -12 -16 -20 REFERENCE CURRENT lref (mA)
0
0.4 0.8 1.2 1.6 Q0 OUTPUT VOLTAGE VO (V)
2.0
APPLICATION EXAMPLE
5V
LED16 x 16 Dot Display
5V
LED Display scan input
5V
Q0 RC Currenf setting input A Serial date input CKS
Q1
Q15
M66503ASP/AGP
LE OEA OEB SQ15 Serial date Output
Shift clock Latch enable input input
Output enable input
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