PCA9633DP2 datasheet(10/42 Pages) NXP

10 / 42 page

PCA9633_3

Product data sheet

Rev. 03 — 20 December 2006

10 of 42

NXP Semiconductors

PCA9633

4-bit Fm+ I2C-bus LED driver

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.

Remark: Other combinations not shown in Table 6 (AI[2:0] = 001, 010, and 011) are

reserved and must not be used for proper device operation.

AI[2:0] = 000 is used when the same register must be accessed several times during a

single I2C-bus communication, for example, changes the brightness of a single LED. Data

is overwritten each time the register is accessed during a write operation.

AI[2:0] = 100 is used when all the registers must be sequentially accessed, for example,

power-up programming.

AI[2:0] = 101 is used when the four LED drivers must be individually programmed with

different values during the same I2C-bus communication, for example, changing color

setting to another color setting.

AI[2:0] = 110 is used when the LED drivers must be globally programmed with different

settings during the same I2C-bus communication, for example, global brightness or

blinking change.

AI[2:0] = 111 is used when individual and global changes must be performed during the

same I2C-bus communication, for example, changing a color and global brightness at the

same time.

Only the 4 least signiﬁcant bits D[3:0] are affected by the AI[2:0] bits.

reset state = 80h

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

Fig 10. Control register

Table 6.

Auto-Increment options

AI2

AI1

AI0

Function

no Auto-Increment

Auto-Increment for all registers. D3, D2, D1, D0 roll over to ‘0000’ after

the last register (1100) is accessed.

Auto-Increment for individual brightness registers only. D3, D2, D1, D0

roll over to ‘0010’ after the last register (0101) is accessed.

Auto-Increment for global control registers only. D3, D2, D1, D0 roll over

to ‘0110’ after the last register (0111) is accessed.

Auto-Increment for individual and global control registers only. D3, D2,

D1, D0 roll over to ‘0010’ after the last register (0111) is accessed.

002aab296

AI2

AI1

AI0

Auto-Increment flag

Auto-Increment options

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