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NXP Semiconductors
PCA9625
16-bit Fm+ I 2 C-bus 100 mA 24 V LED driver
R/W
0
0
0
0
0
1
1
0
002aab416
Fig 4.
Software Reset address
Remark: The Software Reset I 2 C-bus address is a reserved address and cannot be used
as a regular I 2 C-bus slave address or as an LED All Call or LED Sub Call address.
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 PCA9625, 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 ?ag and Auto-Increment options
(AI[2:0]).
register address
AI2 AI1 AI0
D4
D3
D2
D1
D0
002aac147
Auto-Increment options
Auto-Increment flag
reset state = 80h
Remark: The Control register does not apply to the Software Reset I 2 C-bus address.
Fig 5.
Control register
When the Auto-Increment ?ag is set (AI2 = logic 1), the ?ve 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.
Auto-Increment options
AI2
0
1
AI1
0
0
AI0
0
0
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.
1
0
1
Auto-Increment for individual brightness registers only. D[4:0] roll over to
‘0 0010’ after the last register (1 0001) is accessed.
1
1
0
Auto-Increment for global control registers only. D[4:0] roll over to
‘1 0010’ after the last register (1 0011) is accessed.
1
1
1
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.
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.
PCA9625_2
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 15 January 2008
8 of 33
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