PCA9633DP2 datasheet(9/43 Pages) NXP

9 / 43 page

PCA9633_5

Product data sheet

Rev. 05 — 25 July 2008

9 of 43

NXP Semiconductors

PCA9633

4-bit Fm+ I2C-bus LED driver

7.1.2 LED All Call I2C-bus address

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

• 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.

Remark: The default LED All Call I2C-bus address (E0h or 1110 000X) must not be used

as a regular I2C-bus slave address since this address is enabled at power-up. All the

PCA9633s on the I2C-bus will acknowledge the address if sent by the I2C-bus master.

7.1.3 LED Sub Call I2C-bus addresses

• 3 different I2C-bus addresses can be used

• Default power-up values:

– SUBADR1 register: E2h or 1110 001X

– SUBADR2 register: E4h or 1110 010X

– SUBADR3 register: E8h or 1110 100X

• Programmable through I2C-bus (volatile programming)

• At power-up, Sub Call I2C-bus addresses are disabled. PCA9633 does not send an

ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or

E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.

See Section 7.3.7 “I2C-bus subaddress 1 to 3, SUBADRx” for more detail.

Remark: The default LED Sub Call I2C-bus addresses may be used as regular I2C-bus

slave addresses as long as they are disabled.

7.1.4 Software Reset I2C-bus address

The address shown in Figure 9 is used when a reset of the PCA9633 needs to be

performed by the master. The Software Reset address (SWRST Call) must be used with

R/W = 0. If R/W = 1, the PCA9633 does not acknowledge the SWRST. See Section 7.6

“Software Reset” for more detail.

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

as a regular I2C-bus slave address (16-pin version) or as an LED All Call or LED Sub Call

address.

Fig 9.

Software Reset address

002aab416

R/W

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