CAT4103V-GT2 Datasheet, PDF (7/13 Pages) ON Semiconductor – 3-Channel Constant-Current RGB LED Driver

CAT4103
PIN DESCRIPTIONS
Name
GND
BIN
LIN
SIN
CIN
RSET3
RSET2
RSET1
LED3
LED2
LED1
COUT
SOUT
LOUT
BOUT
VDD
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Function
Ground Reference
Blank input pin
Latch Data input pin
Serial Data input pin
Serial Clock input pin
LED current set pin for LED3
LED current set pin for LED2
LED current set pin for LED1
LED channel 3 cathode terminal
LED channel 2 cathode terminal
LED channel 1 cathode terminal
Serial Clock output pin
Serial Data output pin
Latch Data output pin
Blank output pin
Device Supply pin
PIN FUNCTION
GND is the ground reference pin for the entire device.
This pin must be connected to the ground plane on
the PCB.
BIN is the blank input used to disable all channels.
When low, all LED channels are enabled according to
the output latch content. When high, all LED channels
are turned off. This pin can be used to turn all the
LEDs off while preserving the data in the output
latches.
LIN is the latch data input. On the rising edge of LIN,
data is loaded from the 3-bit serial shift register into
the output register latch. On the falling edge of LIN the
data is latched in the output register and isolated from
the state of the serial shift register.
SIN is the serial data input. Data is loaded into the
internal register on each rising edge of CIN.
CIN is the serial clock input. On each rising CIN edge,
data is transferred from SIN to the internal 3-bit serial
shift register.
RSET1 to RSET3 are the LED current set inputs. The
current pulled out of these pins will be mirrored in the
corresponding LED channel with a gain of 400.
LED1 to LED3 are the LED current sink inputs. These
pins are connected to the bottom cathodes of the LED
strings. The current sinks bias the LEDs with a current
equal to 400 times the RSET pin current. For the LED
sink to operate correctly, the voltage on the LED pin
must be above 0.4V. Each LED channel can
withstand and operate with voltages up to 25V.
COUT is a driven output of CIN and can be connected
to the next device in the cascade.
SOUT is the output of the 3-bit serial shift register.
Connect to SIN of the next device in the cascade.
SOUT is clocked on the falling edge of CIN.
LOUT is a driven output of LIN and can be connected
to the next chip in the cascade.
BOUT is a driven output of BIN and can be connected
to the next chip in the cascade.
VDD is the positive supply pin voltage for the
entire device. A small 1µF ceramic capacitor is
recommended close to the pin.
© 2008 SCILLC. All rights reserved.
7
Characteristics subject to change without notice
Doc. No. MD-5038, Rev. A