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CAT3626 Datasheet(PDF) 8 Page - Catalyst Semiconductor

No. de pieza CAT3626
Descripción Electrónicos  6-Channel LED Driver with I2C??Interface
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT3626 Datasheet(HTML) 8 Page - Catalyst Semiconductor

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CAT3626
Doc. No. MD-5014 Rev. D
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
PIN DESCRIPTIONS
Pin #
Name
Function
1
LEDA1
Cathode terminal of LED A1
2
SDA
I
2C Serial data input/output
3
SCL
I
2C Serial clock input
4
EN
Enable input
5
VOUT
Charge pump output connected to the LED anodes
6
VIN
Supply voltage
7
C1-
Bucket capacitor 1 terminal
8
C1+
Bucket capacitor 1 terminal
9
C2-
Bucket capacitor 2 terminal
10
C2+
Bucket capacitor 2 terminal
11
GND
Ground reference
12
LEDC2
Cathode terminal of LED C2
13
LEDC1
Cathode terminal of LED C1
14
LEDB2
Cathode terminal of LED B2
15
LEDB1
Cathode terminal of LED B1
16
LEDA2
Cathode terminal of LED A2
TAB
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 I
2C 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 I
2C 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.


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