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NXP Semiconductors
PCA9632
4-bit Fm+ I 2 C-bus low power LED driver
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 PCA9632 acknowledges this value only. If byte 1 is not equal to
A5h, the PCA9632 does not acknowledge it.
b. Byte 2 = 5Ah: the PCA9632 acknowledges this value only. If byte 2 is not equal to
5Ah, then the PCA9632 does not acknowledge it.
If more than 2 bytes of data are sent, the PCA9632 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 PCA9632 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 PCA9632 (at any time) as
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.
7.6 Using the PCA9632 with and without external drivers
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.
? 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).
Table 14.
Use of INVRT and OUTDRV based on connection to the LEDn outputs
INVRT OUTDRV Direct connection to LEDn
External N-type driver
External P-type driver
Firmware
External
Firmware
External
Firmware
External
pull-up
resistor
pull-up
resistor
pull-up
resistor
0
0
formulas and LED
output state values
LED current formulas and LED required
limiting R [1]
output state
formulas and LED
output state values
required
apply [1]
values inverted
apply
0
1
formulas and LED
LED current formulas and LED not required formulas and LED
not
output state values
apply [1]
limiting R [1]
output state
values inverted
output state values required [3]
apply [3]
1
0
formulas and LED
output state values
LED current formulas and LED required
limiting R
output state
formulas and LED
output state values
required
inverted
values apply
inverted
1
1
formulas and LED
output state values
LED current formulas and LED not
required [2]
limiting R
output state
formulas and LED
output state values
not required
inverted
values apply [2]
inverted
[1]
[2]
[3]
Correct configuration when LEDs directly connected to the LEDn outputs (connection to V DD through current limiting resistor).
Optimum configuration when external N-type (NPN, NMOS) driver used.
Optimum configuration when external P-type (PNP, PMOS) driver used.
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.
16 of 39
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