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NXP Semiconductors
PCA9626
24-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
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 PCA9626, which will be
stored in the Control register.
The lowest 6 bits are used as a pointer to determine which register will be accessed
(D[5:0]). The highest bit is used as Auto-Increment Flag (AIF).
This bit along with the MODE1 register bit 5 and bit 6 provide the Auto-Increment feature.
Bit 6 of the Control register is not used.
register address
AIF
X
D5
D4
D3
D2
D1
D0
Don't care
Auto-Increment Flag
002aad610
reset state = 80h
Remark: The Control register does not apply to the Software Reset I 2 C-bus address.
Fig 6.
Control register
When the Auto-Increment Flag is set (AIF = logic 1), the six 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 of MODE1 register.
Table 3.
Auto-Increment options
AIF
0
1
AI1 [1]
0
0
AI0 [1]
0
0
Function
no Auto-Increment
Auto-Increment for all registers. D[5:0] roll over to 0h after the last register
26h is accessed.
1
0
1
Auto-Increment for individual brightness registers only. D[5:0] roll over to
2h after the last register (19h) is accessed.
1
1
0
Auto-Increment for global control registers and CHASE register. D[5:0] roll
over to 1Ah after the last register (1Ch) is accessed.
1
1
1
Auto-Increment for individual brightness registers; global control registers
and CHASE register. D[5:0] roll over to 2h after the last register (1Ch) is
accessed.
[1]
AI1 and AI0 come from MODE1 register.
Remark: Other combinations not shown in Table 3 (AIF + AI[1:0] = 001b, 010b, 011b and
111b) are reserved and must not be used for proper device operation.
AIF + AI[1:0] = 000b is used when the same register must be accessed several times
during a single I 2 C-bus communication, for example, changes the brightness of a single
LED. Data is overwritten each time the register is accessed during a write operation.
AIF + AI[1:0] = 100b is used when all the registers must be sequentially accessed, for
example, power-up programming.
PCA9626
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
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