PCA9632DP2 datasheet(6/38 Pages) NXP

6 / 38 page

PCA9632_3

Product data sheet

Rev. 03 — 15 July 2008

6 of 38

NXP Semiconductors

PCA9632

4-bit Fm+ I2C-bus low power LED driver

[1]

HVSON10 package die supply ground is connected to both the VSS pin and the exposed center pad. The

VSS pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical,

and board-level performance, the exposed pad needs to be soldered to the board using a corresponding

thermal pad on the board, and for proper heat conduction through the board thermal vias need to be

incorporated in the PCB in the thermal pad region.

Functional description

Refer to Figure 1 “Block diagram of PCA9632”.

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 4 possible programmable addresses using the 2 hardware

address pins for the 10-pin version and just one ﬁxed address for the 8-pin version.

7.1.1 Regular I2C-bus slave address

The I2C-bus slave address of the PCA9632 is shown in Figure 6. To conserve power, no

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

they must be pulled HIGH or LOW (10-pin versions only).

Remark: Using reserved I2C-bus addresses will interfere with other devices, but only if the

devices are on the bus and/or the bus will be open to other I2C-bus systems at some later

date. In a closed system where the designer controls the address assignment these

addresses can be used since the PCA9632 treats them like any other address. The

LED All Call, Software Reset and PCA9564 or PCA9665 slave address (if on the bus) can

never be used for individual device addresses.

• PCA9632 LED All Call address (1110 000) or Software Reset (0000 0110) which are

active on start-up

• PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on

start-up

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

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

Table 3.

Pin description for TSSOP10 and HVSON10

Symbol

Type

Description

LED0

LED driver 0

LED1

LED driver 1

LED2

LED driver 2

LED3

LED driver 3

address input 0

VSS

6[1]

power supply

supply ground

address input 1

SCL

serial clock line

SDA

I/O

serial data line

VDD

power supply

supply voltage

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