CAT4103 Datasheet, PDF (8/13 Pages) ON Semiconductor – 3-Channel Constant-Current RGB LED Driver

CAT4103
Table 5. PIN DESCRIPTIONS
Name
Pin Number
GND
1
BIN
2
LIN
3
SIN
4
CIN
5
RSET3
6
RSET2
7
RSET1
8
LED3
9
LED2
10
LED1
11
COUT
12
SOUT
13
LOUT
14
BOUT
15
VDD
16
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
Function
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 0.4 V.
Each LED channel can withstand and operate with voltages
up to 25 V.
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 1 mF ceramic capacitor is recommended close to the
pin.
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