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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
7.3.5 Group frequency, GRPFREQ
Table 10. GRPFREQ - Group frequency register (address 07h) bit description
Legend: * default value.
Address
07h
Register
GRPFREQ
Bit
7:0
Symbol
GFRQ[7:0]
Access
R/W
Value
0000 0000*
Description
GRPFREQ register
GRPFREQ is used to program the global blinking period when DMBLNK bit (MODE2
register) is equal to logic 1. Value in this register is a ‘don’t care’ when DMBLNK = 0.
Applicable to LED outputs programmed with LDRx = 11 (LEDOUT register).
Blinking period is controlled through 256 linear steps from 00h (41 ms, frequency 24 Hz)
to FFh (10.73 seconds).
global blinking period = ---------------------------------------- ? in sec onds ?
GFRQ ? 7 : 0 ? + 1
24
7.3.6 LED driver output state, LEDOUT
Table 11. LEDOUT - LED driver output state register (address 08h) bit description
Legend: * default value.
(7)
Address
08h
Register
LEDOUT
Bit
7:6
5:4
3:2
1:0
Symbol
LDR3
LDR2
LDR1
LDR0
Access
R/W
R/W
R/W
R/W
Value
00*
00*
00*
00*
Description
LED3 output state control
LED2 output state control
LED1 output state control
LED0 output state control
LDRx = 00 — LED driver x is off (default power-up state).
LDRx = 01 — LED driver x is fully on (individual brightness and group dimming/blinking
not controlled).
LDRx = 10 — LED driver x individual brightness can be controlled through its PWMx
register.
LDRx = 11 — LED driver x individual brightness and group dimming/blinking can be
controlled through its PWMx register and the GRPPWM registers.
7.3.7 I 2 C-bus subaddress 1 to 3, SUBADRx
Table 12.
SUBADR1 to SUBADR3 - I 2 C-bus subaddress registers 0 to 3 (address 09h to
0Bh) bit description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
09h
0Ah
0Bh
SUBADR1
SUBADR2
SUBADR3
7:1
0
7:1
0
7:1
0
A1[7:1]
A1[0]
A2[7:1]
A2[0]
A3[7:1]
A3[0]
R/W
R only
R/W
R only
R/W
R only
1110 001*
0*
1110 010*
0*
1110 100*
0*
I 2 C-bus subaddress 1
reserved
I 2 C-bus subaddress 2
reserved
I 2 C-bus subaddress 3
reserved
Subaddresses are programmable through the I 2 C-bus. Default power-up values are E2h,
E4h, E8h, and the device(s) will not acknowledge these addresses right after power-up
(the corresponding SUBx bit in MODE1 register is equal to logic 0).
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.
14 of 39
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