PCA9625 datasheet(8/33 Pages) NXP

8 / 33 page

PCA9625_2

Product data sheet

Rev. 02 — 15 January 2008

8 of 33

NXP Semiconductors

PCA9625

16-bit Fm+ I2C-bus 100 mA 24 V LED driver

Remark: The Software Reset I2C-bus address is a reserved address and cannot be used

as a regular I2C-bus slave address or as an LED All Call or LED Sub Call address.

7.2 Control register

Following the successful acknowledgement of the slave address, LED All Call address or

LED Sub Call address, the bus master will send a byte to the PCA9625, which will be

stored in the Control register.

The lowest 5 bits are used as a pointer to determine which register will be accessed

(D[4:0]). The highest 3 bits are used as Auto-Increment ﬂag and Auto-Increment options

(AI[2:0]).

When the Auto-Increment ﬂag is set (AI2 = logic 1), the ﬁve low order bits of the Control

program the registers sequentially. Four different types of Auto-Increment are possible,

depending on AI1 and AI0 values.

Remark: Other combinations not shown in Table 3 (AI[2:0] = 001, 010, and 011) are

reserved and must not be used for proper device operation.

Fig 4.

Software Reset address

002aab416

R/W

reset state = 80h

Remark: The Control register does not apply to the Software Reset I2C-bus address.

Fig 5.

Control register

Table 3.

Auto-Increment options

AI2

AI1

AI0

Function

no Auto-Increment

Auto-Increment for all registers. D[4:0] roll over to ‘0 0000’ after the last

Auto-Increment for individual brightness registers only. D[4:0] roll over to

‘0 0010’ after the last register (1 0001) is accessed.

Auto-Increment for global control registers only. D[4:0] roll over to

‘1 0010’ after the last register (1 0011) is accessed.

Auto-Increment for individual and global control registers only. D[4:0] roll

over to ‘0 0010’ after the last register (1 0011) is accessed.

002aac147

AI2

AI1

AI0

Auto-Increment flag

Auto-Increment options

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