PCA9635PW datasheet(21/35 Pages) NXP

21 / 35 page

PCA9635_7

Product data sheet

Rev. 07 — 16 July 2009

21 of 35

NXP Semiconductors

PCA9635

16-bit Fm+ I2C-bus LED driver

Bus transactions

(1) See Table 4 for register deﬁnition.

Fig 11. Write to a speciﬁc register

A5 A4 A3 A2 A1 A0

S A6

slave address

START condition

R/W

acknowledge

from slave

002aac148

data for register D[4:0](1)

X D4 D3 D2 D1 D0

control register

Auto-Increment flag

Auto-Increment options

acknowledge

from slave

acknowledge

from slave

STOP

condition

Fig 12. Write to all registers using the Auto-Increment feature

A5 A4 A3 A2 A1 A0

S A6

slave address

START condition

R/W

acknowledge

from slave

002aac149

MODE1 register

control register

Auto-Increment on

Auto-Increment

on all registers

acknowledge

from slave

acknowledge

from slave

STOP

condition

(cont.)

MODE1

selection

MODE2 register

acknowledge

from slave

SUBADR3 register

acknowledge

from slave

ALLCALLADR register

acknowledge

from slave

Fig 13. Multiple writes to Individual Brightness registers only using the Auto-Increment feature

A5 A4 A3 A2 A1 A0

S A6

slave address

START condition

R/W

acknowledge

from slave

002aac150

PWM0 register

control register

Auto-Increment on

increment

on Individual

brightness

registers only

acknowledge

from slave

acknowledge

from slave

STOP

condition

(cont.)

PWM0

selection

PWM1 register

acknowledge

from slave

PWM14 register

acknowledge

from slave

PWM15 register

acknowledge

from slave

PWM0 register

acknowledge

from slave

PWMx register

acknowledge

from slave

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