PCA9633DP2 datasheet(8/42 Pages) NXP

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PCA9633_3

Product data sheet

Rev. 03 — 20 December 2006

8 of 42

NXP Semiconductors

PCA9633

4-bit Fm+ I2C-bus LED driver

Functional description

Refer to Figure 1 “Block diagram of PCA9633”.

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 subcall 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 PCA9633 is shown in Figure 8. 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 and 16-pin versions).

Remark: For the 16-pin version, 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).

The last bit of the address byte deﬁnes the operation to be performed. When set to logic 1

a read is selected, while a logic 0 selects a write operation.

7.1.2 LED All Call I2C-bus address

• Default power-up value (ALLCALLADR register): E0h or 1110 000

• Programmable through I2C-bus (volatile programming)

• At power-up, LED All Call I2C-bus address is enabled. PCA9633 sends an ACK when

E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.

See Section 7.3.8 “LED All Call I2C-bus address, ALLCALLADR” for more detail.

a. 8-pin version

b. 10-pin version

c. 16-pin version

Fig 8.

Slave address

R/W

002aab318

fixed

slave address

R/W

002aab295

fixed

hardware

selectable

slave address

R/W

002aab319

hardware selectable

slave address

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