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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
AI[2:0] = 110 is used when the LED drivers must be globally programmed with different
settings during the same I 2 C-bus communication, for example, global brightness or
blinking change.
AI[2:0] = 111 is used when individual and global changes must be performed during the
same I 2 C-bus communication, for example, changing a color and global brightness at the
same time.
Only the 5 least signi?cant bits D[4:0] are affected by the AI[2:0] bits.
When the Control register is written, the register entry point determined by D[4:0] is the
?rst register that will be addressed (read or write operation), and can be anywhere
between 0 0000 and 1 0001 (as de?ned in Table 4 ). When AI[2] = 1, the Auto-Increment
?ag is set and the rollover value at which the register increment stops and goes to the next
one is determined by AI[2:0]. See Table 3 for rollover values. For example, if the Control
register = 1110 1100 (ECh), then the register addressing sequence will be (in hex):
0C → … → 11 → 00 → … → 0B → 02 → … → 0B → 02 → … → 0B → 02 → … as long
as the master keeps sending or reading data.
7.3 Register de?nitions
Table 4. Register summary
Only D[4:0] = 0 0000 to 1 0001 are allowed and will be acknowledged.
D[4:0] = 1 0010 to 1 1111 are reserved and will not be acknowledged.
Register number (hex)
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
D4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Name
MODE1
MODE2
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
PWM7
GRPPWM
GRPFREQ
LEDOUT0
LEDOUT1
SUBADR1
SUBADR2
SUBADR3
ALLCALLADR
Type
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
read/write
Function
Mode register 1
Mode register 2
brightness control LED0
brightness control LED1
brightness control LED2
brightness control LED3
brightness control LED4
brightness control LED5
brightness control LED6
brightness control LED7
group duty cycle control
group frequency
LED output state 0
LED output state 1
I 2 C-bus subaddress 1
I 2 C-bus subaddress 2
I 2 C-bus subaddress 3
LED All Call I 2 C-bus address
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
10 of 38
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