NXP Semiconductors
PCA9635
16-bit Fm+ I 2 C-bus LED driver
7.3.1 Mode register 1, MODE1
Table 5. MODE1 - Mode register 1 (address 00h) bit description
Legend: * default value.
Bit
7
Symbol
AI2
Access
read only
Value
0
Description
Register Auto-Increment disabled.
1*
Register Auto-Increment enabled.
6
AI1
read only
0*
Auto-Increment bit 1 = 0.
1
Auto-Increment bit 1 = 1.
5
AI0
read only
0*
Auto-Increment bit 0 = 0.
1
Auto-Increment bit 0 = 1.
4
SLEEP
R/W
0
Normal mode [1] .
1*
Low power mode. Oscillator off [2] .
3
SUB1
R/W
0*
PCA9635 does not respond to I 2 C-bus subaddress 1.
1
PCA9635 responds to I 2 C-bus subaddress 1.
2
SUB2
R/W
0*
PCA9635 does not respond to I 2 C-bus subaddress 2.
1
PCA9635 responds to I 2 C-bus subaddress 2.
1
SUB3
R/W
0*
PCA9635 does not respond to I 2 C-bus subaddress 3.
1
PCA9635 responds to I 2 C-bus subaddress 3.
0
ALLCALL
R/W
0
PCA9635 does not respond to LED All Call I 2 C-bus address.
1*
PCA9635 responds to LED All Call I 2 C-bus address.
[1]
[2]
It takes 500 μ s max. for the oscillator to be up and running once SLEEP bit has been set to logic 0. Timings on LEDn outputs are not
guaranteed if PWMx, GRPPWM or GRPFREQ registers are accessed within the 500 μ s window.
When the oscillator is off (Sleep mode) the LED outputs cannot be turned on, off or dimmed/blinked.
7.3.2 Mode register 2, MODE2
Table 6. MODE2 - Mode register 2 (address 01h) bit description
Legend: * default value.
Bit
7
6
5
Symbol
-
-
DMBLNK
Access
read only
read only
R/W
Value
0*
0*
0*
Description
reserved
reserved
group control = dimming.
1
group control = blinking.
4
INVRT [1]
R/W
0*
Output logic state not inverted. Value to use when no external driver used.
Applicable when OE = 0.
1
Output logic state inverted. Value to use when external driver used.
Applicable when OE = 0.
3
OCH
R/W
0*
Outputs change on STOP command. [2]
1
Outputs change on ACK.
2
OUTDRV [1]
R/W
0
The 16 LED outputs are con?gured with an open-drain structure.
PCA9635_7
1*
The 16 LED outputs are con?gured with a totem-pole structure.
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 16 July 2009
10 of 35
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