PCA9624_2

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 02 — 26 August 2009

9 of 37

NXP Semiconductors

PCA9624

AI[2:0] = 110 is used when the LED drivers must be globally programmed with different

blinking change.

AI[2:0] = 111 is used when individual and global changes must be performed during the

same time.

Only the 5 least significant bits D[4:0] are affected by the AI[2:0] bits.

When the Control register is written, the register entry point determined by D[4:0] is the

first register that will be addressed (read or write operation), and can be anywhere

between 0 0000 and 1 0001 (as defined in Table 4). When AI[2] = 1, the Auto-Increment

flag is set and the rollover value at which the register increment stops and goes to the next

one is determined by AI[2:0]. See Table 3 for rollover values. For example, if the Control

register = 1110 0100 (E4h), then the register addressing sequence will be (in hex):

04

→ … → 0B → 02 → … → 0B → 02 → … → 0B → 02 → … → 0B → 02 → … as long

as the master keeps sending or reading data.

7.3 Register definitions

[1]

Only D[4:0] = 0 0000 to 1 0001 are allowed and will be acknowledged. D[4:0] = 1 0010 to 1 1111 are reserved and will not be

acknowledged.

[2]

When writing to the Control register, bit 4 must be programmed with logic 0 for proper device operation.

Table 4.

Register summary[1][2]

Register number (hex) D4

D3

D2

D1

D0

Name

Type

Function

00

00000

MODE1

read/write

Mode register 1

01

00001

MODE2

read/write

Mode register 2

02

00010

PWM0

read/write

brightness control LED0

03

00011

PWM1

read/write

brightness control LED1

04

00100

PWM2

read/write

brightness control LED2

05

00101

PWM3

read/write

brightness control LED3

06

00110

PWM4

read/write

brightness control LED4

07

00111

PWM5

read/write

brightness control LED5

08

01000

PWM6

read/write

brightness control LED6

09

01001

PWM7

read/write

brightness control LED7

0A

01010

GRPPWM

read/write

group duty cycle control

0B

01011

GRPFREQ

read/write

group frequency

0C

01100

LEDOUT0

read/write

LED output state 0

0D

01101

LEDOUT1

read/write

LED output state 1

0E

01110

SUBADR1

read/write

0F

01111

SUBADR2

read/write

10

10000

SUBADR3

read/write

11

10001

ALLCALLADR

read/write