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PCA9532 bảng dữ liệu(PDF) 7 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  16-bit I2C-bus LED dimmer
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PCA9532_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 17 March 2009
7 of 29
NXP Semiconductors
PCA9532
16-bit I2C-bus LED dimmer
6.3.3 PCS0 - Frequency Prescaler 0
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 1) / 152.
6.3.4 PWM0 - Pulse Width Modulation 0
The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED on)
when the count is less than the value in PWM0 and HIGH (LED off) when it is greater. If
PWM0 is programmed with 00h, then the PWM0 output is always HIGH (LED off).
The duty cycle of BLINK0 = PWM0 / 256.
6.3.5 PCS1 - Frequency Prescaler 1
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 152.
6.3.6 PWM1 - Pulse Width Modulation 1
The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED on)
when the count is less than the value in PWM1 and HIGH (LED off) when it is greater. If
PWM1 is programmed with 00h, then the PWM1 output is always HIGH (LED off).
The duty cycle of BLINK1 = PWM1 / 256.
Table 6.
PSC0 - Frequency Prescaler 0 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PSC0[7]
PSC0[6]
PSC0[5]
PSC0[4]
PSC0[3]
PSC0[2]
PSC0[1]
PSC0[0]
Default
00000000
Table 7.
PWM0 - Pulse Width Modulation 0 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PWM0
[7]
PWM0
[6]
PWM0
[5]
PWM0
[4]
PWM0
[3]
PWM0
[2]
PWM0
[1]
PWM0
[0]
Default
10000000
Table 8.
PSC1 - Frequency Prescaler 1 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PSC1[7]
PSC1[6]
PSC1[5]
PSC1[4]
PSC1[3]
PSC1[2]
PSC1[1]
PSC1[0]
Default
00000000
Table 9.
PWM1 - Pulse Width Modulation 1 register description
Bit
7
6
5
4
3
2
1
0
Symbol
PWM1
[7]
PWM1
[6]
PWM1
[5]
PWM1
[4]
PWM1
[3]
PWM1
[2]
PWM1
[1]
PWM1
[0]
Default
10000000



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