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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
7.7 Using the PCA9634 with and without external drivers
The PCA9634 LED output drivers are 5.5 V only tolerant and can sink up to 25 mA at 5 V.
If the device needs to drive LEDs to a higher voltage and/or higher current, use of an
external driver is required.
? INVRT bit (MODE2 register) can be used to keep the LED PWM control ?rmware the
same (PWMx and GRPPWM values directly calculated from their respective formulas
and the LED output state determined by LEDOUT register value) independently of the
type of external driver. This bit allows LED output polarity inversion/non-inversion only
when OE = 0.
? OUTDRV bit (MODE2 register) allows minimizing the amount of external components
required to control the external driver (N-type or P-type device).
Table 14. Use of INVRT and OUTDRV based on connection to the LEDn outputs when OE = 0
When OE = 1, LED output state is controlled only by OUTNE[1:0] bits (MODE2 register).
INVRT OUTDRV Direct connection to LEDn
External N-type driver
External P-type driver
Firmware
External
Firmware
External
Firmware
External
pull-up
resistor
pull-up
resistor
pull-up
resistor
0
0
formulas and LED
output state values
LED current formulas and LED required
limiting R [1]
output state
formulas and LED
output state values
required
apply [1]
values inverted
apply
0
1
formulas and LED
LED current formulas and LED not required formulas and LED
not
output state values
apply [1]
limiting R [1]
output state
values inverted
output state values required [2]
apply [2]
1
0
formulas and LED
output state values
LED current formulas and LED required
limiting R
output state
formulas and LED
output state values
required
inverted
values apply
inverted
1
1
formulas and LED
output state values
LED current formulas and LED not
required [3]
limiting R
output state
formulas and LED
output state values
not required
inverted
values apply [3]
inverted
[1]
[2]
[3]
Correct con?guration when LEDs directly connected to the LEDn outputs (connection to V DD through current limiting resistor).
Optimum con?guration when external P-type (PNP, PMOS) driver used.
Optimum con?guration when external N-type (NPN, NMOS) driver used.
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
17 of 38
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