TCA6507_16 Datasheet, PDF (25/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

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TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
8.6.6 Register 0x08 (Maximum Intensity per Bank)
BANK
BIT
DEFAULT
Table 17. Register 0x08 (Maximum Intensity Register)
BANK1
BANK0
C7
C6
C5
C4
C3
C2
C1
C0
1
1
1
1
1
1
1
1
The Maximum Intensity register defines the maximum intensity per PWM bank. The values in this register are
used if the One-Shot / Master Intensity Register bits are set to 0 for the corresponding bank. If they are set to 1
(ALD value), then the maximum brightness is defined by the ALD value.
The values for each value are shown in Table 18.
Decimal
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Table 18. Brightness Register Values
Code
Nibble (Hex)
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
Brightness
0%
6.66%
13.32%
19.98%
26.64 %
33.33 %
39.96 %
46.62 %
53.28 %
59.94 %
66.66 %
73.26 %
79.92 %
86.58 %
93.24 %
100 %
8.6.7 Register 0x09 (One-Shot / Master Intensity)
The One-Shot / Master Intensity register (register 9) (see Table 19) is an 8-bit register with three functions.
Bits 0–3 set the master intensity value (ALD). It is a binary number between 0 and 15.
Bits 4–5 determine whether the maximum intensity of PWM0 and PWM1 is set by the programmed F value
(BRIGHT_F0 or BRIGHT_F1) or the master ALD value. The default value for these bits is 0. Bit 4 supports
PWM0 and bit 5 is for PWM1. If bit 4 (or bit 5) is 0, the maximum intensity value for PWM0 (or PWM1) is set by
the F value. If bit 4 (or bit 5) is 1, the maximum intensity value for PWM0 (or PWM1) is set by the master ALD
value. This allows the user to vary the brightness of all LEDs by changing a single register.
Bits 6–7 determine whether each PWM operates in normal or one-shot mode. Bit 6 supports PWM0 and bit 7 is
for PWM1. If bit 6 (or bit 7) is 0, PWM0 (or PWM1) operates in the normal mode where the LEDs goes through
the full intensity cycle defined by Table 5 and Figure 19. If bit 6 (or bit 7) is 1, PWM0 (or PWM1) operate in the
one-shot mode. In this mode, the LEDs can be used to create a single-shot lighting effect where the LED
intensity is valid for a particular segment of the cycle shown in Table 5 and Figure 19.
Table 19. One-Shot / Master Intensity Register
BIT
DESCRIPTION
0–3
Master intensity (ALD) value. Valid values are 0 to 15. See Table 18 for more information
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