TCA6507_16 Datasheet, PDF (24/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
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The Fully-ON Time register (register 4) defines the time spent at maximum intensity between the fade-ON state
and fade-OFF state for the LED per region B in Figure 19. The first four bits (C7–C4) in this register set the
fully-ON time for BANK1, and the next four bits (C3–C0) set the fully-ON time 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
most significant bit (MSB) is bit C3, while the LSB is bit C0.
See Table 7 for more information on the possible time values.
8.6.3 Register 0x04 (Fully-ON Time)
BANK
BIT
DEFAULT
Table 13. Register 0x04 (Fully-ON Time Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
0
1
0
0
0
1
0
0
The Fade-OFF Time register (register 5) defines the time from the fully-ON state to the fully-OFF state for the
LED per region C in Figure 19. The first four bits (C7–C4) in this register set the fade-OFF time for BANK1, and
the next four bits (C3–C0) set the fade-OFF time 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 least
significant bit (LSB) is bit C0.
See Table 7 for more information on the possible time values.
8.6.4 Register 0x05 (Fade-OFF Time)
BANK
BIT
DEFAULT
Table 14. Register 0x05 (Fade-OFF Time Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
0
1
0
0
0
1
0
0
The first and second Fully-OFF Time registers (registers 6 and 7) define the time spent at zero intensity (in the
fully-OFF state of the LED) per region D and E, respectively, in Figure 19. The first four bits (C7–C4) in this
register set the fully-OFF time for BANK1, and the next four bits (C3–C0) set the fully-OFF time 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.
See Table 7 for more information on the possible time values.
8.6.5 Register 0x06 - 0x07 (Fully-OFF Time)
BANK
BIT
DEFAULT
Table 15. Register 0x06 (First Fully-OFF Time Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
0
1
0
0
0
1
0
0
BANK
BIT
DEFAULT
Table 16. Register 0x07 (Second Fully-OFF Time Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
0
1
0
0
0
1
0
0
The Maximum Intensity register defines the duty cycle of the waveform driving the LED in its fully-ON state per
region F in Figure 19. 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).
See Table 7 for more information on the possible time values.
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