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NXP Semiconductors
PCA9634
8-bit Fm+ I 2 C-bus LED driver
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 SLEEP setting. The value needs to be 0 so that the
OSC is turn on. If the OSC is turned off, the LEDs cannot be turned on or off and also
can’t be dimmed or blinked.
Question 5: I’m using LEDs with integrated Zener diodes and the IC is getting very hot.
Why?
? The IC outputs can be set to either open-drain or push-pull and default to push-pull
outputs. In this application with the Zener diodes, they need to be set to open-drain
since in the push-pull architecture there is a low resistance path to ground through the
Zener and this is causing the IC to overheat. The PCA9632/33/34/35 ICs all power-up
in the push-pull output mode and with the logic state HIGH, so one of the ?rst things
that need to be done is to set the outputs to open-drain.
11. Limiting values
Table 16. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V DD
V I/O
I O(LEDn)
I SS
P tot
T stg
T amb
Parameter
supply voltage
voltage on an input/output pin
output current on pin LEDn
ground supply current
total power dissipation
storage temperature
ambient temperature
Conditions
operating
Min
? 0.5
V SS ? 0.5
-
-
-
? 65
? 40
Max
+6.0
5.5
25
200
400
+150
+85
Unit
V
V
mA
mA
mW
° C
° C
PCA9634_6
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 12 September 2008
25 of 38
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