TLC59208F Datasheet, PDF (9/37 Pages) Texas Instruments – 8-BIT FM+ I2C BUS LED DRIVER

www.ti.com
9 Detailed Description
TLC59208F
SCLS715A – MARCH 2009 – REVISED NOVEMBER 2015
9.1 Overview
The TLC59208F is an I2C bus controlled 8-bit LED driver optimized for red, green, blue, or amber (RGBA)
colormixing applications. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual
PWM controller that operates at 97 kHz with a duty cycle adjustable from 0% to 99.6% to allow the LED to be set
to a specific brightness value. An additional 8-bit resolution (256 steps) group PWM controller has both a fixed
frequency of 190 Hz and an adjustable frequency between 24 Hz to once every 10.73 seconds with a duty cycle
adjustable from 0% to 99.6% that can either dim or blink all LEDs with the same value.
Each LED output can be off, on (no PWM control), set at its individual PWM controller value or at both individual
and group PWM controller values. The TLC59208F operates with a supply voltage range of 3 V to 5.5 V and the
outputs are 17 V tolerant. LEDs can be directly connected to the TLC59208F device outputs.
Software programmable LED group and three sub call I2C bus addresses allow all or defined groups of
TLC59208F devices to respond to a common I2C bus address, allowing for example, all the same color LEDs to
be turned on or off at the same time or marquee chasing effect, thus minimizing I2C bus commands.
The software reset (SWRST) call allows the master to perform a reset of the TLC59208F through the I2C bus,
identical to the power-on reset (POR) that initializes the registers to their default state causing the outputs to be
set high (LED off). This allows an easy and quick way to reconfigure all device registers to the same condition.
9.2 Functional Block Diagram
A0 A1 A2
OUT0 OUT1
OUT6 OUT7
SCL
SDA
INPUT FILTER
2
I C BUS CONTROL
RESET
POWER-ON
RESET CONTROL
97 kHz
25 MHz
OSCILLATOR
PWM
REGISTER X
BRIGHTNESS
CONTROL
24.3 kHz
GRPFREQ
REGISTER
190 Hz
OUTPUT DRIVER AND
ERROR DETECTION
LED STATE
SELECT
REGISTER
GRPPWM
REGISTER
V_CC
GND
‘0’ – Permanently OFF
‘1’ – Permanently ON
TLC59208F
NOTE: Only one PWM shown for clarity.
9.3 Feature Description
9.3.1 Power-On Reset
When power is applied to V_CC, an internal power-on reset holds the TLC59208F in a reset condition until V_CC has
reached V_POR. At this point, the reset condition is released and the TLC59208F registers and I²C bus state
machine are initialized to their default states causing all the channels to be deselected. Thereafter, V_CC must be
lowered below 0.2 V to reset the device.
Copyright © 2009–2015, Texas Instruments Incorporated
Product Folder Links: TLC59208F
Submit Documentation Feedback
9