TCA6507_10 Datasheet, PDF (10/32 Pages) Texas Instruments – LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN

TCA6507
LOW-VOLTAGE 7-BIT I²C AND SMBus LED DRIVER
WITH INTENSITY CONTROL AND SHUTDOWN
SCPS164B – MAY 2007 – REVISED NOVEMBER 2007
www.ti.com
Table 13. Time Parameters
CODE
0
1
2
3
4 (default)
5
6
7
8
9
10
11
12
13
14
15
TIME (ms)
0
64
128
192
256
384
512
768
1024
1536
2048
3072
4096
5760
8128
16320
The Maximum Intensity register (register 8) defines the duty cycle of the waveform driving the LED in its fully-on
state per region F in Figure 7. The first four bits (C7–C4) in this register set the duty cycle for BANK1 and the
next four bits (C3–C0) set the duty cycle for BANK0. The data for each bank is a binary number between 0 and
15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the MSB is bit C3, while the LSB is bit
C0. The values in this register also define the LED intensity indicated by the BRIGHT_F0 or BRIGHT_F1 modes.
The intensity of each LED is updated 125 times per second (every 8 ms with a 32-kHz clock).
BANK
BIT
DEFAULT
Table 14. Register 8 (Maximum Intensity Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
1
1
1
1
1
1
1
1
REGION
A1, A2
B1, B2
C1, C2
D
E
F
Table 15. Intensity Parameters (see Figure 7)
PARAMETER NAME
Fade-on time
Fully-on time
Fade-off time
First fully-off time
Second fully-off time
Maximum intensity
PARAMETER RANGE
0 to 16320 ms
(exponential trend)
0 to 16320 ms
(exponential trend)
0 to 16320 ms
(exponential trend)
0 to 16320 ms
(exponential trend)
0 to 16320 ms
(exponential trend)
0 to 100%
REGISTER
RANGE
0 to 15
0 to 15
0 to 15
0 to 15
0 to 15
0 to 15
REGISTER NAME
Fade-On Time
Fully-On Time
Fade-Off Time
First Fully-Off Time
Second Fully-Off Time
Maximum Intensity
REGISTER
2
3
4
5
6
7
10
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