PCA9622 datasheet(8/39 Pages) NXP

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PCA9622

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Product data sheet

Rev. 4 — 6 September 2012

8 of 39

NXP Semiconductors

PCA9622

16-bit Fm+ I2C-bus 100 mA 40 V LED driver

Remark: Other combinations not shown in Table 3 (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 16 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 5 least significant bits D[4:0] are affected by the AI[2:0] bits.

When the Control register is written, the register entry point determined by D[4:0] is the

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

between 0 0000 and 1 1011 (as defined in Table 4). When AI[2] = 1, the Auto-Increment

flag is set and the rollover value at which the register increment stops and goes to the next

one is determined by AI[2:0]. See Table 3 for rollover values. For example, if the Control

hexadecimal):

 …  1B  00  …  13  02  …  13  02  …  13  02  … as long

as the master keeps sending or reading data.

Table 3.

Auto-Increment options

AI2

AI1

AI0

Function

no Auto-Increment

Auto-Increment for all registers. D[4:0] roll over to ‘0 0000’ after the last

Auto-Increment for individual brightness registers only. D[4:0] roll over to

‘0 0010’ after the last register (1 0001) is accessed.

Auto-Increment for global control registers only. D[4:0] roll over to

‘1 0010’ after the last register (1 0011) is accessed.

Auto-Increment for individual and global control registers only. D[4:0] roll

over to ‘0 0010’ after the last register (1 0011) is accessed.

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