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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
7.7 Using the PCA9685 with and without external drivers
The PCA9685 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 firmware the
same 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 11.
Use of INVRT and OUTDRV based on connection to the LEDn outputs when OE = 0 [1]
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 [2]
output state
formulas and LED
output state values
required
inverted
values inverted
apply
0
1
formulas and LED
output state values
LED current formulas and LED not
limiting R [2]
required [3]
output state
formulas and LED
output state values
not required
values apply
inverted
[3]
inverted
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
apply [2]
values apply
inverted
1
1
formulas and LED
LED current formulas and LED not required formulas and LED
not
output state values
apply [2]
limiting R
output state
values inverted
output state values required [4]
apply [4]
[1]
[2]
[3]
[4]
When OE = 1, LED output state is controlled only by OUTNE[1:0] bits (MODE2 register).
Correct configuration when LEDs directly connected to the LEDn outputs (connection to V DD through current limiting resistor).
Optimum configuration when external N-type (NPN, NMOS) driver used.
Optimum configuration when external P-type (PNP, PMOS) driver used.
LED0
+5 V
LED0
+5 V
LED0
+V DD
002aad169
INVRT = 0
OUTDRV = 1
Fig 13. External N-type driver
PCA9685
Product data sheet
002aad170
INVRT = 1
OUTDRV = 1
Fig 14. External P-type driver
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
002aad171
INVRT = 1
OUTDRV = 0
Fig 15. Direct LED connection
? NXP B.V. 2010. All rights reserved.
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