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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
10. Application design-in information
V DD = 2.5 V, 3.3 V or 5.0 V
5V
12 V
I 2 C-BUS/SMBus
MASTER
SDA
SCL
10 k Ω
10 k Ω
SDA
SCL
V DD
LED0
LED1
LED2
A0
A1
PCA9632
LED3
V SS
002aad049
I 2 C-bus address = 1100 001X.
All of the 4 LED outputs configurable as either open-drain or totem pole. Mixing of configurations is
not possible.
Fig 21. Typical application
Question 1: What kind of edge rate control is there on the outputs?
? The typical edge rates depend on the output configuration, supply voltage, and the
applied load. The outputs can be configured as either open-drain NMOS or totem pole
outputs. If the customer is using the part to directly drive LEDs, they should be using it
in an open-drain NMOS, if they are concerned about the maximum I SS and ground
bounce. The edge rate control was designed primarily to slow down the turn-on of the
output device; it turns off rather quickly (~ 1.5 ns). In simulation, the typical turn-on
time for the open-drain NMOS was ~ 14 ns (V DD = 3.6 V; C L = 50 pF; R PU = 500 ? ).
Question 2: Is ground bounce possible?
? Ground bounce is a possibility, especially if all 16 outputs transition at full current
(25 mA each). There is a fair amount of decoupling capacitance on chip (~ 50 pF),
which is intended to suppress some of the ground bounce. The customer will need to
determine if additional decoupling capacitance externally placed as close as
physically possible to the device is required.
Question 3: Can I really sink 400 mA through the single ground pin on the package and
will this cause any ground bounce problem due to the PWM of the LEDs?
? Yes, you can sink 400 mA through a single ground pin on the package . Although the
package only has one ground pin, there are two ground pads on the die itself
connected to this one pin. Although some ground bounce is likely, it will not disrupt the
operation of the part and would be reduced by the external decoupling capacitance.
Question 4: I can’t turn the LEDs on or off, but their registers are set properly. Why?
? Check the Mode register 1 bit 4 (MODE1[4]) SLEEP setting. The value needs to be a
logic 0 so that the OSC is turned on. If the OSC is turned off, the LEDs cannot be
turned on or off and also can’t be dimmed or blinked.
PCA9632
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 July 2011
? NXP B.V. 2011. All rights reserved.
24 of 39
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