PCA9533DP/02,118 データシートの表示（PDF） - NXP Semiconductors.
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PCA9533DP/02,118 Datasheet PDF : 24 Pages
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NXP Semiconductors
PCA9533
4-bit I2C-bus LED dimmer
6.3.4 PCS1 - Frequency Prescaler 1
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 152.
Table 8.
Bit
Symbol
Default
PSC1 - Frequency Prescaler 1 register description
7
6
5
4
3
2
PSC1[7] PSC1[6] PSC1[5] PSC1[4] PSC1[3] PSC1[2]
0
0
0
0
0
0
1
PSC1[1]
0
0
PSC1[0]
0
6.3.5 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 9.
Bit
Symbol
Default
PWM1 - Pulse Width Modulation 1 register description
7
6
5
4
3
2
PWM1 PWM1 PWM1 PWM1 PWM1 PWM1
[7]
[6]
[5]
[4]
[3]
[2]
1
0
0
0
0
0
1
PWM1
[1]
0
0
PWM1
[0]
0
6.3.6 LS0 - LED selector
The LSn LED selector register determines the source of the LED data.
00 = output is set high-impedance (LED off; default)
01 = output is set LOW (LED on)
10 = output blinks at PWM0 rate
11 = output blinks at PWM1 rate
Table 10. LS0 - LED selector register bit description
Legend: * default value.
Register Bit
Value
Description
LS0
7:6
00*
LED3 selected
5:4
00*
LED2 selected
3:2
00*
LED1 selected
1:0
00*
LED0 selected
PCA9533_3
Product data sheet
Rev. 03 — 27 April 2009
© NXP B.V. 2009. All rights reserved.
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