pca9552bs NXP Semiconductors, pca9552bs Datasheet - Page 7

• Manufacturer Part Number: pca9552bs
• Description: 16-bit I2c Led Driver With Programmable Blink Rates
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PCA9552_5
Product data sheet
6.3.3 PCS0 - Frequency Prescaler 0
6.3.4 PWM0 - Pulse Width Modulation 0
6.3.5 PCS1 - Frequency Prescaler 1
6.3.6 PWM1 - Pulse Width Modulation 1
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 1) / 44.
Table 6:
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
Table 7:
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 44.
Table 8:
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
Table 9:
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
PSC0 - Frequency Prescaler 0 register description
PWM0 - Pulse Width Modulation 0 register description
PSC1 - Frequency Prescaler 1 register description
PWM1 - Pulse Width Modulation 1 register description
PSC0[7]
PSC1[7]
PWM0
PWM1
[7]
[7]
7
1
7
1
7
1
7
1
PSC0[6]
PSC1[6]
PWM0
PWM1
Rev. 05 — 9 March 2006
[6]
[6]
6
1
6
0
6
1
6
0
16-bit I
PSC0[5]
PSC1[5]
PWM0
PWM1
[5]
[5]
5
1
5
0
5
1
5
0
PWM0) / 256.
PWM1) / 256.
2
C-bus LED driver with programmable blink rates
PSC0[4]
PSC1[4]
PWM0
PWM1
[4]
[4]
4
1
4
0
4
1
4
0
PSC0[3]
PSC1[3]
PWM0
PWM1
[3]
[3]
3
1
3
0
3
1
3
0
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
PSC0[2]
PSC1[2]
PWM0
PWM1
[2]
[2]
2
1
2
0
2
1
2
0
PCA9552
PSC0[1]
PSC1[1]
PWM0
PWM1
[1]
[1]
1
1
1
0
1
1
1
0
PSC0[0]
PSC1[0]
PWM0
PWM1
[0]
[0]
7 of 28
0
1
0
0
0
1
0
0