PCA9632DP2 datasheet(9/38 Pages) NXP

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PCA9632_3

Product data sheet

Rev. 03 — 15 July 2008

9 of 38

NXP Semiconductors

PCA9632

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

Remark: Other combinations not shown in Table 4 (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.

When the Control register is written, the register entry point determined by D[3:0] is the

ﬁrst register that will be addressed (read or write operation), and can be anywhere

between 0000 and 1100 (as deﬁned in Table 5). When AI[2] = 1, the Auto-Increment ﬂag

is set and the rollover value at which the point where the register increment stops and

goes to the next one is determined by AI[2:0]. See Table 4 for rollover values. For

example, if the Control register = 1110 1000 (E8h), then the register addressing sequence

will be (in hex):

→ … → 0C → 00 → … → 07 → 02 → … → 07 → 02 → … → 07 → 02 → … as long

as the master keeps sending or reading data.

Table 4.

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.

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