PCA9632DP2 datasheet(8/38 Pages) NXP

8 / 38 page

PCA9632_3

Product data sheet

Rev. 03 — 15 July 2008

8 of 38

NXP Semiconductors

PCA9632

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

7.1.4 Software reset I2C-bus address

The address shown in Figure 7 is used when a reset of the PCA9632 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 PCA9632 does not acknowledge the SWRST. See Section 7.5

“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 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 PCA9632, which will be

stored in the Control register.

The lowest 4 bits are used as a pointer to determine which register will be accessed

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

(AI[2:0]). Bit 4 is unused and must be programmed with zero (0) for proper device

operation.

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

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

depending on AI1 and AI0 values.

Fig 7.

Software reset address

002aab416

R/W

reset state = 80h

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

Fig 8.

Control register

002aab296

AI2

AI1

AI0

Auto-Increment flag

Auto-Increment options

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