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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
7.3.3 PWM registers 0 to 3, PWMx — Individual brightness control registers
Table 8. PWM0 to PWM3 - PWM registers 0 to 3 (address 02h to 05h) bit description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
02h
03h
04h
05h
PWM0
PWM1
PWM2
PWM3
7:0
7:0
7:0
7:0
IDC0[7:0]
IDC1[7:0]
IDC2[7:0]
IDC3[7:0]
R/W
R/W
R/W
R/W
0000 0000* PWM0 Individual Duty Cycle
0000 0000* PWM1 Individual Duty Cycle
0000 0000* PWM2 Individual Duty Cycle
0000 0000* PWM3 Individual Duty Cycle
While operating in Individual brightness mode (LDRx = 10), a 1.5625 kHz fixed frequency
signal is used for each output. Duty cycle is controlled through 256 linear steps from 00h
(0 % duty cycle = LED output off) to FFh (99.6 % duty cycle = LED output at maximum
brightness). In this mode, all the 8 bits are used.
IDCx ? 7 : 0 ?
duty cycle = ---------------------------
256
(1)
E.g., if IDCx[7:0] = 1111 1111, then duty cycle = 255 / 256 = 99.6 %.
While operating in group dimming mode, a 6.25 kHz fixed frequency signal is used for
each output. Duty cycle is controlled through 64 linear steps from 00h (0 % duty cycle =
LED output off) to 3Fh (98.4 % duty cycle = LED output at maximum brightness). In this
mode only the 6 MSBs are used (IDCx[7:2]). The 2 LSBs IDCx[1:0] are ignored.
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT register).
IDCx ? 7 : 2 ? , 00
duty cycle = -----------------------------------
256
(2)
E.g., if IDCx[7:2] = 111111, then duty cycle = 1111 1100 / 256 = 252 / 256 = 98.4 %.
While operating in blink mode, a 1.5625 kHz fixed frequency signal is used for each
output. Duty cycle is controlled through 256 linear steps from 00h (0 % duty cycle = LED
output off) to FFh (99.6 % duty cycle = LED output at maximum brightness). In this mode,
all the 8 bits are used.
IDCx ? 7 : 0 ?
duty cycle = ---------------------------
256
E.g., if IDCx[7:0] = 1111 1111, then duty cycle = 255 / 256 = 99.6 %.
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT register).
(3)
PCA9632
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 July 2011
? NXP B.V. 2011. All rights reserved.
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