TCA6507_16 Datasheet, PDF (22/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
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8.5.8 Intensity Control
The Maximum Intensity registers must be written to for setting the intensity of the LED. This register has eight
bits – top four bits for BANK1 (or PWM1), and bottom four bits for BANK0 (or PWM0). This register can be
written to after sending data to the Second Fully-OFF Time register (see Table 20).
The Maximum Intensity register has a default value of 15 (1111), which translates to 100% brightness
(see Figure 19 and Table 5).
8.6 Register Maps
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
Table 6. Control Register Description
COMMAND
BYTE (HEX)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
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
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
POWER-UP
DEFAULT
(BINARY)
0000 0000
0000 0000
0000 0000
0100 0100
0100 0100
0100 0100
0100 0100
0100 0100
1111 1111
0000 1111
N/A
The Select0 register (register 0x00), Select1 (register 0x01), and Select2 register (register 0x02) configure the
state of each of the outputs (see Table 8).
Registers that define time periods have a range of 0 to 16320 ms, as defined in Table 7.
CODE (DECIMAL)
0
1
2
3
4 (default)
5
6
7
8
9
10
11
12
13
14
15
Table 7. Time Parameters
TIME (ms)
0
64
128
192
256
384
512
768
1024
1536
2048
3072
4096
5760
8128
16320
22
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