PCA9553 Philips Semiconductors, PCA9553 Datasheet - Page 10

• Manufacturer Part Number: PCA9553
• Description: 4-bit I2C LED driver with programmable blink rates
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Programming example
The following example will show how to set LED0 and LED1 off. It
will then set LED2 to blink at 1 Hz, 50% duty cycle. LED3 will be set
to blink at 4 Hz, 25% duty cycle. PCA9553/01 is used in this
example.
Table 1.
2004 Oct 01
Start
PCA9553 address
PSC0 subaddress + auto-increment
Set prescaler PSC0 to achieve a period of 1 second:
Set PWM0 duty cycle to 50%:
Set prescaler PWM1 to achieve a period of
0.25 seconds:
Set PWM1 output duty cycle to 25%:
Set LED0 on, LED1 off, LED2 set to blink at PSC0,
PWM0, LED3 set to blink at PCS1, PWM1
Stop
4-bit I
256 – PWM0
256 – PWM1
Blink period
Blink period
256
256
2
PWM1 = 192
PWM0 = 128
C LED driver with programmable blink rates
PSC0 = 43
PSC1 = 10
0.5
0.25
1
0.25
PSC0
44
PSC1
1
44
1
I
S
C4h
11h
2Bh
80h
0Ah
C0h
E4h
P
2
C-bus
10
PCA9553
Product data sheet