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M66503 Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M66503 16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH Mitsubishi
MITSUBISHI ELECTRIC  Mitsubishi
M66503 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
MITMSITUSBUISBHISI HDI IGDIITGAILTAALSASSPSP
M66503MA66S50P3A/ASPG/APGP
16-1B6IT-BCITOCNOSTNASNTTANCTUCRURRENRTENLTEDLEDDRDIVREIRVEwRithwSithHISFHTIFRTEGREISGTIESRTEARNDANLDATLCAHTCH
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 con-
stant 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 re-
sister, 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 be-
tween 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 em-
ployed 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 anode-
common 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 accu-
rate 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 simulta-
neously 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 ex-
pand 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 1
SERIAL DATA INPUT A 2
SHIFT CLOCK INPUT CKS 3
LATCH ENABLE LE 4
INPUT NC 5
PARALLEL DATA Q0 6
OUTPUT Q1 7
GND2 8
Q2 9
PARALLEL DATA Q3 10
OUTPUT Q4 11
Q5 12
GND3 13
PARALLEL DATA Q6 14
OUTPUT Q7 15
30 VCC
29 RC CURRENT SETTING INPUT
28 SQ15 SERIAL DATA OUTPUT
27 OEA OUTPUT ENABLE INPUT A
26 OEB OUTPUT ENABLE INPUT B
25 Q15 PARALLEL DATA
24 Q14 OUTPUT
23 GND5
22 Q13
21 Q12 PARALLEL DATA
20 Q11 OUTPUT
19 Q10
18 GND4
17 Q9
16 Q8
PARALLEL DATA
OUTPUT
Outline 30P4B
GND1 1
SERIAL DATA INPUT A 2
SHIFT CLOCK INPUT CKS 3
LATCH ENABLE LE 4
INPUT NC 5
NC 6
Q0 7
PARALLEL DATA Q1 8
OUTPUT Q2 9
Q3 10
GND2 11
PARALLEL DATA Q4 12
OUTPUT Q5 13
NC 14
NC 15
NC 16
PARALLEL DATA Q6 17
OUTPUT Q7 18
36 VCC
35 RC CURRENT SETTING INPUT
34 SQ15 SERIAL DATA OUTPUT
33 OEA OUTPUT ENABLE INPUT A
32 OEB OUTPUT ENABLE INPUT B
31 NC
30 Q15
29 Q14 PARALLEL DATA
28 Q13 OUTPUT
27 Q12
26 GND3
25 Q11 PARALLEL DATA
24 Q10 OUTPUT
23 NC
22 NC
21 NC
20 Q9
19 Q8
PARALLEL DATA
OUTPUT
Outline 36P2R-D
NC: No Connection
1
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