TCA6507_16 Datasheet, PDF (20/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
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8.5.5 Auto-Increment Mode
In auto-increment mode, the last four bits of the command byte are automatically incremented after the byte is
written, and the next data byte is stored in the corresponding register.
Master controls SDA line
Slave controls SDA line
Device (Slave) Address (7 bits)
Command Byte (8 bits)
Data to Register 0x00 (Select0)
S 1 00 0 10 1 0A0 00 1 00 0 0A0 00 0 00 1 0A
START
R/W=0 ACK
Auto-increment ACK
ACK
Data to Register 0x01 (Select1) Data to Register 0x02 (Select2)
00000010A00000010AP
ACK
The registers are written to in the order shown in Table 6.
ACK STOP
8.5.6 LED Operation
For LED states, see Figure 10 and Table 8.
It is the combination of Select2, Select1, and Select0 registers that gives the state of the LED or Px.
Bit 0 from the Select0 register, bit = 0 from Select1 register, and bit=0 from the Select2 register provide the state
for P0, or the first LED. Similarly, bit = 1 from the Select0 register, bit 1 from Select1 register, and bit = 1 from the
Select2 register provide the state for P1, or the second LED (see Table 4).
Select0
Select1
Select2
Output or
LED affected
MSB
X
X
X
X
X
Table 4. LED Operation
0
0
0
P6
7th LED
0
0
0
P5
6th LED
0
0
0
P4
5th LED
0
0
0
P3
4th LED
0
0
0
P2
3rd LED
0
0
0
P1
2nd LED
LSB
0
0
0
P0
1st LED
8.5.7 Blinking Pattern Control
The Fade-ON time, Fully-ON time, Fade-OFF time, First Fully-OFF time, and Second Fully-OFF time registers
must be written to for basic blink control. Each of these registers has eight bits – top four bits for BANK1 (or
PWM1), and bottom four bits for BANK0 (or PWM0) (see Table 20).
Each BANK or PWM has a default value of 4 (4b0100), which translates to a time of 256 ms. The largest value
for each BANK or PWM is 15 (4b1111), which translates to a time of 16320 ms (see Figure 19 and Table 5).
REGION
A1, A2
Table 5. Intensity Parameters (see Figure 19)
PARAMETER NAME
Fade-ON time
PARAMETER RANGE
0 to 16320 ms
(exponential trend)
REGISTER
RANGE
0 to 15
REGISTER NAME
Fade-ON time
REGISTER
0x03
20
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