PCA9625 datasheet(6/33 Pages) NXP

6 / 33 page

PCA9625_2

Product data sheet

Rev. 02 — 15 January 2008

6 of 33

NXP Semiconductors

PCA9625

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

Functional description

Refer to Figure 1 “Block diagram of PCA9625”.

7.1 Device addresses

Following a START condition, the bus master must output the address of the slave it is

accessing.

There are a maximum of 128 possible programmable addresses using the 7 hardware

address pins. Two of these addresses, Software Reset and LED All Call, cannot be used

because their default power-up state is ON, leaving a maximum of 126 addresses. Using

other reserved addresses, as well as any other Sub Call address, will reduce the total

number of possible addresses even further.

7.1.1 Regular I2C-bus slave address

The I2C-bus slave address of the PCA9625 is shown in Figure 3. To conserve power, no

internal pull-up resistors are incorporated on the hardware selectable address pins and

they must be pulled HIGH or LOW.

Remark: Reserved I2C-bus addresses must be used with caution since they can interfere

with:

• ‘reserved for future use’ I2C-bus addresses (0000 011, 1111 1XX)

• slave devices that use the 10-bit addressing scheme (1111 0XX)

• slave devices that are designed to respond to the General Call address (0000 000)

• High-speed mode (Hs-mode) master code (0000 1XX)

VSS(DRV)FET

power supply

FET driver supply ground

LED4

LED driver 4

LED5

LED driver 5

LED6

LED driver 6

LED7

LED driver 7

VDD(DRV)FET

power supply

supply voltage for FET driver

VSS

power supply

supply ground

VDD(DRV)FET

power supply

supply voltage for FET driver

LED8

LED driver 8

LED9

LED driver 9

LED10

LED driver 10

LED11

LED driver 11

VSS(DRV)FET

power supply

FET driver supply ground

LED12

LED driver 12

Table 2.

Pin description for SO32

Symbol

Type

Description

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