PCA9633 Datasheet, PDF (25/43 Pages) NXP Semiconductors – 4-bit Fm+ I2C-bus LED driver

NXP Semiconductors
PCA9633
4-bit Fm+ I²C-bus LED driver
slave address⁽¹⁾
control register
new LED All Call I²C address⁽²⁾
sequence (A) S 1 1 0 0 0 A1 A0 0 A X X X 0 1 1 0 0 A 1 0 1 0 1 0 1 X A P
START condition
R/W
acknowledge
from slave
ALLCALLADR
register selection ^acknowledge
from slave
Auto-Increment on
acknowledge
from slave
STOP
condition
LED All Call I²C address
control register
the 16 LEDs are on at the acknowledge⁽³⁾
LEDOUT register (LED fully ON)
sequence (B) S 1 0 1 0 1 0 1 0 A X X X 0 1 0 0 0 A 0 1 0 1 0 1 0 1 A P
START condition
R/W
acknowledge
from the
4 devices
LEDOUT
register selection ^acknowledge
from the
4 devices
acknowledge
from the
4 devices
STOP
condition
002aab424
(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 I²C-bus address programming and LED All Call sequence example
SWRST Call I²C address
SWRST data
Byte 1 = A5h
SWRST data
Byte 2 = 5Ah
S0 0 0 0 0 1 1 0A1 0 1 0 0 1 0 1A0 1 0 1 1 0 1 0AP
START condition
R/W
acknowledge
from slave(s)
Fig 21. Software Reset (SWRST) Call sequence
acknowledge
from slave(s)
acknowledge
from slave(s)
PCA9633(s) is(are) reset.
Registers are set to default power-up values.
002aab425
PCA9633_5
Product data sheet
Rev. 05 — 25 July 2008
© NXP B.V. 2008. All rights reserved.
25 of 43