PCA9632DP1 NXP [NXP Semiconductors], PCA9632DP1 Datasheet - Page 16

• Manufacturer Part Number: PCA9632DP1
• Description: 4-bit Fm+ I2C-bus low power LED driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
Table 14.
[1]
[2]
[3]
PCA9632_3
Product data sheet
INVRT OUTDRV Direct connection to LEDn
0
0
1
1
Correct configuration when LEDs directly connected to the LEDn outputs (connection to V
Optimum configuration when external N-type (NPN, NMOS) driver used.
Optimum configuration when external P-type (PNP, PMOS) driver used.
0
1
0
1
Use of INVRT and OUTDRV based on connection to the LEDn outputs
7.6 Using the PCA9632 with and without external drivers
Firmware
formulas and LED
output state values
apply
formulas and LED
output state values
apply
formulas and LED
output state values
inverted
formulas and LED
output state values
inverted
The I
a ‘SWRST Call Abort’. The PCA9632 does not initiate a reset of its registers. This
happens only when the format of the SWRST Call sequence is not correct.
The PCA9632 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.
[1]
[1]
4. Once the SWRST Call address has been sent and acknowledged, the master sends
5. Once the right 2 bytes (SWRST data byte 1 and byte 2 only) have been sent and
•
•
2 bytes with 2 specific values (SWRST data byte 1 and byte 2):
a. Byte 1 = A5h: the PCA9632 acknowledges this value only. If byte 1 is not equal to
b. Byte 2 = 5Ah: the PCA9632 acknowledges this value only. If byte 2 is not equal to
If more than 2 bytes of data are sent, the PCA9632 does not acknowledge any more.
correctly acknowledged, the master sends a STOP command to end the SWRST Call:
the PCA9632 then resets to the default value (power-up value) and is ready to be
addressed again within the specified bus free time (t
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.
OUTDRV bit (MODE2 register) allows minimizing the amount of external components
required to control the external driver (N-type or P-type device).
2
C-bus master must interpret a non-acknowledge from the PCA9632 (at any time) as
A5h, the PCA9632 does not acknowledge it.
5Ah, then the PCA9632 does not acknowledge it.
External
pull-up
resistor
LED current
limiting R
LED current
limiting R
LED current
limiting R
LED current
limiting R
Rev. 03 — 15 July 2008
[1]
[1]
External N-type driver
Firmware
formulas and LED
output state
values inverted
formulas and LED
output state
values inverted
formulas and LED
output state
values apply
formulas and LED
output state
values apply
[2]
External
pull-up
resistor
required
not required formulas and LED
required
not
required
4-bit Fm+ I
DD
[2]
through current limiting resistor).
BUF
2
External P-type driver
Firmware
formulas and LED
output state values
apply
output state values
apply
formulas and LED
output state values
inverted
formulas and LED
output state values
inverted
C-bus low power LED driver
).
[3]
PCA9632
© NXP B.V. 2008. All rights reserved.
External
pull-up
resistor
required
not
required
required
not required
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[3]