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PCA9633D16,112

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P43
PCA9633_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 July 2008 25 of 43
NXP Semiconductors
PCA9633
4-bit Fm+ I
2
C-bus LED driver
(1) 10-pin version is used for this figure. Four PCA9633DP2s are used and the same sequence (A) (above) is sent to each of them.
A[1:0] = 00 to 11.
(2) ALLCALL bit in MODE1 register is equal to 1 for this example.
(3) OCH bit in MODE2 register is equal to 1 for this example.
Fig 20. LED All Call I
2
C-bus address programming and LED All Call sequence example
1 0 0 0 A1 A0 0 AS 1
slave address
(1)
START condition R/W
acknowledge
from slave
002aab424
X X 0 1 1 0 0X
control register
Auto-Increment on
A
acknowledge
from slave
ALLCALLADR
register selection
0 1 0 1 0 1 X1
new LED All Call I
2
C address
(2)
P
STOP
condition
A
acknowledge
from slave
0 1 0 1 0 1 0 AS 1
LED All Call I
2
C address
START condition R/W
acknowledge
from the
4 devices
X X 0 1 0 0 0X
control register
A
acknowledge
from the
4 devices
LEDOUT
register selection
1 0 1 0 1 0 10
LEDOUT register (LED fully ON)
P
STOP
condition
A
acknowledge
from the
4 devices
the 16 LEDs are on at the acknowledge
(3)
sequence (A)
sequence (B)
Fig 21. Software Reset (SWRST) Call sequence
002aab425
0 0 0 0 1 1 0 AS 0
SWRST Call I
2
C address
START condition R/W
acknowledge
from slave(s)
0 1 0 0 1 0 11
SWRST data
Byte 1 = A5h
A
acknowledge
from slave(s)
1 0 1 1 0 1 00
SWRST data
Byte 2 = 5Ah
P
PCA9633(s) is(are) reset.
Registers are set to default power-up values.
A
acknowledge
from slave(s)
PCA9633_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 July 2008 26 of 43
NXP Semiconductors
PCA9633
4-bit Fm+ I
2
C-bus LED driver
10. Application design-in information
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 ISS 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 Ω).
Question 2: Is ground bounce possible?
• Ground bounce is a possibility, especially if all 16 outputs are changed 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.
I
2
C-bus address = 0010 101X.
All of the 4 LEDn outputs configurable as either open-drain or totem pole. Mixing of configurations is not possible.
(1) OE requires pull-up resistor if control signal from the master is open-drain.
Fig 22. Typical application
PCA9633
LED0
LED1
SDA
SCL
OE
V
DD
= 2.5 V, 3.3 V or 5.0 V
I
2
C-BUS/SMBus
MASTER
002aab286
SDA
SCL
10 kΩ
OE
10 kΩ
LED2
LED3
A0
A1
A2
V
DD
A3
A4
A5
A6
V
SS
5 V
10 kΩ
(1)
12 V
PCA9633_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 July 2008 27 of 43
NXP Semiconductors
PCA9633
4-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 GND 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 first things
that need to be done is to set the outputs to open-drain.
11. Limiting values
Table 19. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter Conditions Min Max Unit
V
DD
supply voltage −0.5 +6.0 V
V
I/O
voltage on an input/output pin V
SS
− 0.5 5.5 V
I
O(LEDn)
output current on pin LEDn - 25 mA
I
SS
ground supply current - 100 mA
P
tot
total power dissipation - 400 mW
T
stg
storage temperature −65 +150 °C
T
amb
ambient temperature operating −40 +85 °C
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PCA9633D16,112

Mfr. #:
Buy PCA9633D16,112
Manufacturer:
NXP Semiconductors
Description:
LED Lighting Drivers LED DRVR 4BIT I2C
Lifecycle:
New from this manufacturer.
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