pca9634 NXP Semiconductors, pca9634 Datasheet - Page 9

• Manufacturer Part Number: pca9634
• Description: Pca9634 8-bit Fm I2c-bus Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9634_4
Product data sheet
When the Auto-Increment flag is set (AI2 = 1), the five low order bits of the Control register
are automatically incremented after a read or write. This allows the user to program the
registers sequentially. Four different types of Auto-Increment are possible, depending on
AI1 and AI0 values.
Table 4.
Remark: Other combinations not shown in
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 I
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 I
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 I
blinking change.
AI[2:0] = 111 is used when individual and global changes must be performed during the
same I
same time.
Only the 5 least significant bits D[4:0] are affected by the AI[2:0] bits.
AI2
0
1
1
1
1
Fig 7. Control register
2
2
C-bus communication, for example, changing a color and global brightness at the
AI1
0
0
0
1
1
C-bus communication, for example, changes the brightness of a single LED. Data
reset state = 80h
Remark: The Control register does not apply to the Software Reset I
Auto-Increment options
AI0
0
0
1
0
1
Rev. 04 — 5 January 2007
Function
no Auto-Increment
Auto-Increment for all registers. D[4:0] roll over to ‘0 0000’ after the last
register (1 0001) is accessed.
Auto-Increment for individual brightness registers only. D[4:0] roll over to
‘0 0010’ after the last register (0 1001) is accessed.
Auto-Increment for global control registers only. D[4:0] roll over to
‘0 1010’ after the last register (0 1011) is accessed.
Auto-Increment for individual and global control registers only. D[4:0] roll
over to ‘0 0010’ after the last register (0 1011) is accessed.
2
C-bus communication, for example, global brightness or
AI2 AI1 AI0 D4
Auto-Increment flag
2
Auto-Increment options
C-bus communication, for example, changing color
Table 4
register address
D3
D2
(AI[2:0] = 001, 010, and 011) are
D1
002aac140
D0
8-bit Fm+ I
2
C-bus address.
PCA9634
2
© NXP B.V. 2007. All rights reserved.
C-bus LED driver
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