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Philips Semiconductors
PCA9552
16-bit I 2 C-bus LED driver with programmable blink rates
6.3.3 PCS0 - Frequency Prescaler 0
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 1) / 44.
Table 6:
PSC0 - Frequency Prescaler 0 register description
Bit
Symbol
Default
7
PSC0[7]
1
6
PSC0[6]
1
5
PSC0[5]
1
4
PSC0[4]
1
3
PSC0[3]
1
2
PSC0[2]
1
1
PSC0[1]
1
0
PSC0[0]
1
6.3.4 PWM0 - Pulse Width Modulation 0
The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off)
when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is
programmed with 00h, then the PWM0 output is always LOW.
The duty cycle of BLINK0 = (256 ? PWM0) / 256.
Table 7:
PWM0 - Pulse Width Modulation 0 register description
Bit
Symbol
Default
7
PWM0
[7]
1
6
PWM0
[6]
0
5
PWM0
[5]
0
4
PWM0
[4]
0
3
PWM0
[3]
0
2
PWM0
[2]
0
1
PWM0
[1]
0
0
PWM0
[0]
0
6.3.5 PCS1 - Frequency Prescaler 1
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 44.
Table 8:
PSC1 - Frequency Prescaler 1 register description
Bit
Symbol
Default
7
PSC1[7]
1
6
PSC1[6]
1
5
PSC1[5]
1
4
PSC1[4]
1
3
PSC1[3]
1
2
PSC1[2]
1
1
PSC1[1]
1
0
PSC1[0]
1
6.3.6 PWM1 - Pulse Width Modulation 1
The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED off)
when the count is less than the value in PWM1 and HIGH when it is greater. If PWM1 is
programmed with 00h, then the PWM1 output is always LOW.
The duty cycle of BLINK1 = (256 ? PWM1) / 256.
Table 9:
PWM1 - Pulse Width Modulation 1 register description
Bit
Symbol
Default
7
PWM1
[7]
1
6
PWM1
[6]
0
5
PWM1
[5]
0
4
PWM1
[4]
0
3
PWM1
[3]
0
2
PWM1
[2]
0
1
PWM1
[1]
0
0
PWM1
[0]
0
PCA9552_5
? Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 05 — 9 March 2006
7 of 28
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