PRELIMINARY
CM9156A
Functional Block Diagram
3.0V T O 6.0V
1.0uF
1.0uF
1.0uF
V IN
C 1P
C 1N
C 2P
C 2N
E NA
L DOP
re-
R egulator
1.5x C harge Pump
V OUT
4.5V
1.0uF
GND
OS C
C ounter
Driver
CM9156A
C L K1
C L K2
Pin Discriptions
PIN DESCRIPTIONS
LEAD(s)
NAME
DESCRIPTION
1
2
3
4
5
6
7
8
9
10
VOUT
C1P
VIN
CLK1
CLK2
ENA
C2N
GND
C1N
C2P
The regulated 4.5V output voltage pin. This pin requires a 1.0μF or larger ceramic
capacitor to ground. This pin connects to the anodes of the LEDs.
This pin is the plus side of charge pump bucket capacitor C1. Connect a 1.0μF
ceramic capacitor with a voltage rating of 10V or greater between C1N and C1P.
Positive supply voltage input pin. This voltage should be between 3.0V and 6V.
This pin requires a 1.0μF or larger ceramic capacitor to ground.
Bit 1 for setting switching frequency (see
Bit 2 for setting switching frequency (see
Enable pin, active high. By applying a PWM signal to this pin, the LED brightness
can be controlled.
This pin is the minus side of charge pump bucket capacitor C2. Connect a 1.0μF
ceramic capacitor between C2N and C2P.
Ground pin.
This pin is the minus side of charge pump bucket capacitor C1. Connect a 1.0μF
ceramic capacitor between C1N and C1P.
This pin is the plus side of charge pump bucket capacitor C2. Connect a 1.0μF
ceramic capacitor between C2N and C2P.
©
2006 California Micro Devices Corp. All rights reserved.
04/26/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.cmd.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
