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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 16 of 43
NXP Semiconductors
PCA9633
4-bit Fm+ I
2
C-bus LED driver
7.4 Active LOW output enable input
The active LOW output enable (OE) pin, allows to enable or disable all the LED outputs at
the same time.
This control signal is only available for the 16-pin version and does not apply to the 8-pin
or 10-pin versions.
• When a LOW level is applied to OE pin, all the LED outputs are enabled and follow the
output state defined in the LEDOUT register with the polarity defined by INVRT bit
(MODE2 register).
• When a HIGH level is applied to OE pin, all the LED outputs are programmed to the
value that is defined by OUTNE[1:0] in the MODE2 register.
The OE pin can be used as a synchronization signal to switch on/off several PCA9633
devices at the same time. This requires an external clock reference that provides blinking
period and the duty cycle.
The OE pin can also be used as an external dimming control signal. The frequency of the
external clock must be high enough not to be seen by the human eye, and the duty cycle
value determines the brightness of the LEDs.
Remark: Do not use OE as an external blinking control signal when internal global
blinking is selected (DMBLNK = 1, MODE2 register) since it will result in an undefined
blinking pattern. Do not use OE as an external dimming control signal when internal global
dimming is selected (DMBLNK = 0, MODE2 register) since it will result in an undefined
dimming pattern.
7.5 Power-on reset
When power is applied to V
DD
, an internal Power-on reset holds the PCA9633 in a reset
condition until V
DD
has reached V
POR
. At this point, the reset condition is released and the
PCA9633 registers and I
2
C-bus state machine are initialized to their default states (all
zeroes) causing all the channels to be deselected. Thereafter, V
DD
must be lowered below
0.2 V to reset the device.
Table 16. LED outputs when OE=1
OUTNE1 OUTNE0 LED outputs
000
0 1 1 if OUTDRV = 1, high-impedance if OUTDRV = 0
1 0 high-impedance
1 1 reserved
PCA9633_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 July 2008 17 of 43
NXP Semiconductors
PCA9633
4-bit Fm+ I
2
C-bus LED driver
7.6 Software Reset
The Software Reset Call (SWRST Call) allows all the devices in the I
2
C-bus to be reset to
the power-up state value through a specific formatted I
2
C-bus command. To be performed
correctly, it implies that the I
2
C-bus is functional and that there is no device hanging the
bus.
The SWRST Call function is defined as the following:
1. A START command is sent by the I
2
C-bus master.
2. The reserved SWRST I
2
C-bus address ‘0000 011’ with the R/W bit set to 0 (write) is
sent by the I
2
C-bus master.
3. The PCA9633 device(s) acknowledge(s) after seeing the SWRST Call address
‘0000 0110’ (06h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to
the I
2
C-bus master.
4. Once the SWRST Call address has been sent and acknowledged, the master sends
2 bytes with 2 specific values (SWRST data byte 1 and byte 2):
a. Byte 1 = A5h: the PCA9633 acknowledges this value only. If byte 1 is not equal to
A5h, the PCA9633 does not acknowledge it.
b. Byte 2 = 5Ah: the PCA9633 acknowledges this value only. If byte 2 is not equal to
5Ah, then the PCA9633 does not acknowledge it.
If more than 2 bytes of data are sent, the PCA9633 does not acknowledge any more.
5. Once the right 2 bytes (SWRST data byte 1 and byte 2 only) have been sent and
correctly acknowledged, the master sends a STOP command to end the SWRST Call:
the PCA9633 then resets to the default value (power-up value) and is ready to be
addressed again within the specified bus free time (t
BUF
).
The I
2
C-bus master must interpret a non-acknowledge from the PCA9633 (at any time) as
a ‘SWRST Call Abort’. The PCA9633 does not initiate a reset of its registers. This
happens only when the format of the SWRST Call sequence is not correct.
PCA9633_5 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 05 — 25 July 2008 18 of 43
NXP Semiconductors
PCA9633
4-bit Fm+ I
2
C-bus LED driver
7.7 Using the PCA9633 with and without external drivers
The PCA9633 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 (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).
[1] OE applies to 16-pin version only. When OE = 1, LED output state is controlled only by OUTNE[1:0] bits (MODE2 register).
[2] Correct configuration when LEDs directly connected to the LEDn outputs (connection to V
DD
through current limiting resistor).
[3] Optimum configuration when external N-type (NPN, NMOS) driver used.
[4] Optimum configuration when external P-type (PNP, PMOS) driver used.
Table 17. 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
pull-up
resistor
Firmware External
pull-up
resistor
Firmware External
pull-up
resistor
0 0 formulas and LED
output state values
apply
[2]
LED current
limiting R
[2]
formulas and LED
output state
values inverted
required formulas and LED
output state values
apply
required
0 1 formulas and LED
output state values
apply
[2]
LED current
limiting R
[2]
formulas and LED
output state
values inverted
not required formulas and LED
output state values
apply
[4]
not
required
[4]
1 0 formulas and LED
output state values
inverted
LED current
limiting R
formulas and LED
output state
values apply
required formulas and LED
output state values
inverted
required
1 1 formulas and LED
output state values
inverted
LED current
limiting R
formulas and LED
output state
values apply
[3]
not
required
[3]
formulas and LED
output state values
inverted
not required
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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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