pca9635 NXP Semiconductors, pca9635 Datasheet - Page 8

• Manufacturer Part Number: pca9635
• Description: Pca9635 16-bit Fm I2c-bus Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9635_5
Product data sheet
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 PCA9635, which will be
stored in the Control register.
The lowest 5 bits are used as a pointer to determine which register will be accessed
(D[4:0]). The highest 3 bits are used as Auto-Increment flag and Auto-Increment options
(AI[2:0]).
When the Auto-Increment flag is set (AI2 = logic 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 3.
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.
AI2
0
1
1
1
1
Fig 5. Control register
2
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. 05 — 22 March 2007
Function
no Auto-Increment
Auto-Increment for all registers. D[4:0] roll over to ‘0 0000’ after the last
register (1 1011) is accessed.
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.
AI2 AI1 AI0 D4
Auto-Increment flag
Auto-Increment options
2
C-bus communication, for example, changing color
Table 3
register address
D3
D2
(AI[2:0] = 001, 010, and 011) are
D1
002aac147
D0
16-bit Fm+ I
2
C-bus address.
PCA9635
2
© NXP B.V. 2007. All rights reserved.
C-bus LED driver
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