TCA6507_10 Datasheet, PDF (7/32 Pages) Texas Instruments – LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN

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TCA6507
LOW-VOLTAGE 7-BIT I²C AND SMBus LED DRIVER
WITH INTENSITY CONTROL AND SHUTDOWN
SCPS164B – MAY 2007 – REVISED NOVEMBER 2007
After the command byte is received, the I²C master starts sending data bytes. The first data byte goes into the
internal register defined by the command byte. Bit B4 in the command byte is used to determine the
programming mode. If B4 is low, all data bytes are written to the register defined by B0, B1, B2, and B3. If B4 is
high, the last four bits of the command byte are automatically incremented after the byte is written, and the next
data byte is stored in the corresponding register. Registers are written in the sequence shown in Table 3. Once
the Initialization register (register 10) is written to, the command byte returns to 0 (Select0 register). Registers 11
to 15 are reserved, and a command byte that references these registers is not acknowledged by the TCA6507.
The upper three bits (B7–B5) of the command byte must be programmed as zeroes for proper operation.
If a Stop condition occurs after the command byte is received, the TCA6507 stores the command byte and then
remains idle until the I²C master sends the next operation.
B7 B6 B5 B4 B3 B2 B1 B0
Figure 6. Control Register Bits
Table 2. Command Byte
BIT
FUNCTION
B7
Reserved. Must be programmed as 0.
B6
Reserved. Must be programmed as 0.
B5
Reserved. Must be programmed as 0.
B4
Auto increment
B3
Register address 3
B2
Register address 2
B1
Register address 1
B0
Register address 0
CONTROL REGISTER BITS
B3
B2
B1
B0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Table 3. Control Register Description
COMMAND
BYTE (HEX)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x10
0x11
0x12
0x13
0x14
0x15
REGISTER
Select0
Select1
Select2
Fade-On Time
Fully-On Time
Fade-Off Time
First Fully-Off Time
Second Fully-Off Time
Maximum Intensity
One Shot / Master Intensity
Initialization
Reserved
Reserved
Reserved
Reserved
Reserved
PROTOCOL
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Read/write byte
Write byte
N/A
N/A
N/A
N/A
N/A
POWER-UP
DEFAULT
0000 0000
0000 0000
0000 0000
0100 0100
0100 0100
0100 0100
0100 0100
0100 0100
1111 1111
0000 1111
N/A
N/A
N/A
N/A
N/A
N/A
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TCA6507
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