TCA6507_16 Datasheet, PDF (23/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

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TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
8.6.1 Registers 0x00 - 0x02 (Select Registers)
SELECT2
0
0
0
0
1
1
1
1
SELECT1
0
0
1
1
0
0
1
1
Table 8. Select2, Select1, and Select0 Register States
SELECT0
0
1
0
1
0
1
0
1
STATE
LED off (high impedance).
LED off (high impedance).
LED on with maximum intensity value of PWM0 (ALD value or BRIGHT_F0 value, depending
on One Shot / Master Intensity Register setting).
LED on with maximum intensity value of PWM1 (ALD value or BRIGHT_F1 value, depending
on One Shot / Master Intensity Register setting).
LED fully on (output low). Can be used as general-purpose output.
LED on at brightness set by One Shot / Master Intensity register.
LED blinking with intensity characteristics of BANK0 (PWM0).
LED blinking with intensity characteristics of BANK1 (PWM1).
BIT
DEFAULT
(1) X = Don't care.
Table 9. Register 0x00 (Select0 Register)
S0-7
X ⁽¹⁾
S0-6
0
S0-5
0
S0-4
0
S0-3
0
S0-2
0
S0-1
0
S0-0
0
BIT
DEFAULT
(1) X = Don't care.
Table 10. Register 0x01 (Select1 Register)
S1-7
X ⁽¹⁾
S1-6
0
S1-5
0
S1-4
0
S1-3
0
S1-2
0
S1-1
0
S1-0
0
Table 11. Register 0x02 (Select2 Register)
BIT
DEFAULT
S2-7
X ⁽¹⁾
S2-6
0
S2-5
0
S2-4
0
S2-3
0
S2-2
0
S2-1
0
S2-0
0
(1) X = Don't care.
To use a P port as a general-purpose output, Select1 and Select0 registers must be set low (or 0), and then the
inverse of the data written to the Select2 bit appears on the open-drain output.
The intensity of each bank of LEDs can be customized by programming six registers: Fade-ON Time, Fully-ON
Time, Fade-OFF Time, First Fully-OFF Time, Second Fully-OFF Time, and Maximum Intensity registers. Each
bank is designed to produce two identical intensity pulses per blink cycle. Both pulses have the same fade-ON,
fully-ON and fade-OFF times, but independent fully-OFF times to achieve a double-blink effect when desired.
The Fade-ON Time register (register 0x03) defines the time from the fully-OFF state to the fully-ON state for the
LED per region A in Figure 19. The first four bits (C7–C4) in this register set the fade-ON time for BANK1, and
the next four bits (C3–C0) set the fade-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 least significant bit (LSB) is bit C4. For BANK0, the MSB is bit
C3 while the LSB is bit C0. See Table 7 for more information.
8.6.2 Register 0x03 (Fade-ON Time)
BANK
BIT
DEFAULT
Table 12. Register 0x03 (Fade-ON Time Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
0
1
0
0
0
1
0
0
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