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NXP Semiconductors
PCA9633
4-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 4 least signi?cant bits D[3:0] are affected by the AI[2:0] bits.
When the Control register is written, the register entry point determined by D[3:0] is the
?rst register that will be addressed (read or write operation), and can be anywhere
between 0000 and 1100 (as de?ned in Table 7 ). When AI[2] = 1, the Auto-Increment ?ag
is set and the rollover value at which the point where the register increment stops and
goes to the next one is determined by AI[2:0]. See Table 6 for rollover values. For
example, if the Control register = 1110 1000 (E8h), then the register addressing sequence
will be (in hex):
08 → … → 0C → 00 → … → 07 → 02 → … → 07 → 02 → … → 07 → 02 → … as long
as the master keeps sending or reading data.
7.3 Register de?nitions
Table 7.
Register summary [1][2]
Register number (hex)
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
D3
0
0
0
0
0
0
0
0
1
1
1
1
1
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
D1
0
0
1
1
0
0
1
1
0
0
1
1
0
D0
0
1
0
1
0
1
0
1
0
1
0
1
0
Name
MODE1
MODE2
PWM0
PWM1
PWM2
PWM3
GRPPWM
GRPFREQ
LEDOUT
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
Function
Mode register 1
Mode register 2
brightness control LED0
brightness control LED1
brightness control LED2
brightness control LED3
group duty cycle control
group frequency
LED output state
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
[1]
[2]
Only D[3:0] = 0000 to 1100 are allowed and will be acknowledged. D[3:0] = 1101, 1110, or 1111 are reserved and will not be
acknowledged.
When writing to the Control register, bit 4 must be programmed with logic 0 for proper device operation.
PCA9633_5
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 25 July 2008
11 of 43
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