NXP Semiconductors
PCA9633
4-bit Fm+ I 2 C-bus LED driver
Table 18.
Output transistors based on LEDOUT registers, INVRT and OUTDRV bits when OE = 0 [1]
LEDOUT
INVRT
OUTDRV Upper transistor Lower transistor
(V DD to LEDn)
(LEDn to V SS )
LEDn state
00
LED driver off
01
LED driver on
10
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
off
on
off
off
off
off
off
on
off
off
off
on
on
on
on
off
off
Individual PWM
high-Z [2]
V DD
V SS
V SS
V SS
V SS
high-Z [2]
V DD
V SS or high-Z [2] = PWMx value
Individual
(non-inverted)
brightness
0
1
Individual PWM
Individual PWM
V SS or V DD = PWMx value
control
(non-inverted)
(non-inverted)
1
0
off
Individual PWM
high-Z [2] or V SS = 1 ? PWMx value
(inverted)
1
1
Individual PWM
Individual PWM
V DD or V SS = 1 ? PWMx value
(inverted)
(inverted)
11
0
0
off
Individual + Group V SS or high-Z [2] = PWMx/GRPPWM values
Individual +
Group
PWM
(non-inverted)
dimming/blinking 0
1
Individual PWM
Individual PWM
V SS or V DD = PWMx/GRPPWM values
(non-inverted)
(non-inverted)
1
0
off
Individual + Group high-Z [2] or V SS = (1 ? PWMx) or
PWM (inverted) (1 ? GRPPWM) values
1
1
Individual PWM
(inverted)
Individual PWM
(inverted)
V DD or V SS = (1 ? PWMx) or
(1 ? GRPPWM) values
[1]
[2]
OE applies to 16-pin version only. When OE = 1, LED output state is controlled only by OUTNE[1:0] bits (MODE2 register).
External pull-up or LED current limiting resistor connects LEDn to V DD .
PCA9633_5
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 25 July 2008
19 of 43
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