CAT3626HV4-T2 Datasheet, PDF (8/15 Pages) ON Semiconductor – 6-Channel LED Driver with I2C™ Interface

CAT3626
PIN DESCRIPTIONS
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
LEDA1
SDA
SCL
EN
VOUT
VIN
C1-
C1+
C2-
C2+
GND
LEDC2
LEDC1
LEDB2
LEDB1
LEDA2
TAB
Function
Cathode terminal of LED A1
I²C Serial data input/output
I²C Serial clock input
Enable input
Charge pump output connected to the LED anodes
Supply voltage
Bucket capacitor 1 terminal
Bucket capacitor 1 terminal
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
Ground reference
Cathode terminal of LED C2
Cathode terminal of LED C1
Cathode terminal of LED B2
Cathode terminal of LED B1
Cathode terminal of LED A2
Connect to Ground on PCB
PIN FUNCTION
VIN is the supply pin for the charge pump. A small 1μF
ceramic bypass capacitor is required between the VIN
pin and ground near the device. The operating input
voltage range is from 2.2V to 5.5V. Whenever the input
supply falls below the undervoltage threshold (2V), all
LEDs channels will be automatically disabled.
EN is the enable logic input for the driver. Guaranteed
levels of logic high and logic low are set at 1.3V and
0.4V respectively. When EN is initially taken high, the
device becomes enabled and all LED currents remain
at 0mA. To place the device into zero current shutdown
mode, the EN pin must be held low.
SDA is the I²C serial data line. This is a bidirectional
line allowing data to be written into and read from the
four registers in the driver. Registers RegA/B/C set the
LED current in each pair of channels, while RegEn sets
the On/Off state independently of each channel.
SCL is the I²C serial clock input.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1μF ceramic bypass
capacitor is required between the VOUT pin and
ground near the device.
GND is the ground reference for the charge pump. The
pin must be connected to the ground plane on the
PCB.
C1+, C1- are connected to each side of the 1μF
ceramic bucket capacitor C1.
C2+, C2- are connected to each side of the 1μF
ceramic bucket capacitor C2.
LEDxx provide the internally regulated current to the
six LED cathodes. These pins enter a high-impedance
zero-current state whenever the device is placed in
shutdown mode. In applications using less than six
LEDs, the unused channels should be disabled
through the RegEn register.
TAB is the exposed pad underneath the package. For
best thermal performance, the tab should be soldered
to the PCB and connected to the ground plane.
Doc. No. MD-5014 Rev. E
8
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice