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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
7.3.6 LEDOUT0 and LEDOUT1: LED driver output state
Table 10.
LEDOUT0 and LEDOUT1- LED driver output state registers (address 0Ch and
0Dh) bit description
Legend: * default value.
Address
0Ch
0Dh
Register
LEDOUT0
LEDOUT1
Bit
7:6
5:4
3:2
1:0
7:6
5:4
3:2
1:0
Symbol
LDR3
LDR2
LDR1
LDR0
LDR7
LDR6
LDR5
LDR4
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Value
00*
00*
00*
00*
00*
00*
00*
00*
Description
LED3 output state control
LED2 output state control
LED1 output state control
LED0 output state control
LED7 output state control
LED6 output state control
LED5 output state control
LED4 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 SUBADR1 to SUBADR3: I 2 C-bus subaddress 1 to 3
Table 11.
SUBADR1 to SUBADR3 - I 2 C-bus subaddress registers 1 to 3 (address 0Eh to
10h) bit description
Legend: * default value.
Address
Register
Bit
Symbol
Access Value
Description
0Eh
0Fh
10h
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 0).
Once subaddresses have been programmed to their right values, SUBx bits need to be
set to 1 in order to have the device acknowledging these addresses (MODE1 register).
Only the 7 MSBs representing the I 2 C-bus subaddress are valid. The LSB in SUBADRx
register is a read-only bit (0).
When SUBx is set to 1, the corresponding I 2 C-bus subaddress can be used during either
an I 2 C-bus read or write sequence.
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
14 of 38
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