TLC59108F_15 Datasheet, PDF (11/37 Pages) Texas Instruments – 8-Bit FM+ I2C Bus LED Driver

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Feature Description (continued)
1 2 3 4 5 6 7 8 9 10 11 12
TLC59108F
SLDS162B – MARCH 2009 – REVISED DECEMBER 2015
508 510 512 508 510 512
507 508 511 507 508 511 1 2 3 4 5 6 7 8 9 10 11
M X 256 X 2 X 40 ns
with M = (0 to 255)
(GRPPWM Register)
N X 40 ns with
N = (0 to 255)
(PWMx Register)
256 X 40 ns = 10.24 µs
(97.6 kHz)
Group Dimming Signal
12 3 4 5 6 7 8
256 X 2 X 256 X 40 ns = 5.24 ms (190.7 Hz)
12 3 4 5 6 7 8
Resulting Brightness + Group Dimming Signal
A. Minimum pulse width for LEDn brightness control is 40 ns.
B. Minimum pulse width for group dimming is 20.48 μs.
C. When M = 1 (GRPPWM register value), the resulting LEDn brightness control and group dimming signal will have two
pulses of the LED brightness control signal (pulse width = N × 40 ns,w ith N defined in the PWMx register).
D. The resulting brightness plus group dimming signal shown above demonstrate a resulting control signal with M = 4 (8
pulses).
Figure 7. Brightness + Group Dimming Signals
8.4 Device Functional Modes
Active - Active mode occurs when one or more of the output channels is enabled.
Standby - Standby mode occurs when all output channels are disabled. Standby mode may be entered either
through I²C command or by pulling the RESET pin low.
8.5 Programming
8.5.1 Device Address
Following a Start condition, the bus master must output the address of the slave it is accessing.
8.5.2 Regular I²C Bus Slave Address
The I²C bus slave address of the TLC59108F is shown in Figure 8. To conserve power, no internal pullup
resistors are incorporated on the hardware-selectable address pins, and they must be pulled high or low. For
buffer management purpose, a set of sector information data should be stored.
Slave Address
1 0 0 A3 A2 A1 A0 R/W
Fixed Hardware Selectable
Figure 8. Slave Address
The last bit of the address byte defines the operation to be performed. When set to logic 1, a read operation is
selected. When set to logic 0, a write operation is selected.
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