INPUT FILTER

I C BUS CONTROL

2

GRPFREQ

REGISTER

POWER-ON

RESET CONTROL

25 MH

OSCILLATOR

z

‘0’ – Permanently OFF

‘1’ – Permanently ON

NOTE:

All 8 FETs

are present

GND

RESET

SDA

SCL

190 Hz

24.3 H

k z

97 H

k z

GRPPWM

REGISTER

PWM

REGISTER

BRIGHTNESS

CONTROL

X

LED STATE

SELECT

REGISTER

OUTPUT DRIVER AND

ERROR DETECTION

A1

A3

A0

A2

OUT0

OUT1

OUT6

OUT7

TLC59108F

www.ti.com

SLDS162B – MARCH 2009 – REVISED DECEMBER 2015

8 Detailed Description

8.1 Overview

mixing 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 that is 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 that is adjustable from 0% to 99.6% that is used to 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 TLC59108F 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 TLC59108F device outputs.

Four hardware address pins allow up to 14 devices on the same 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.

8.2 Functional Block Diagram

Only one PWM shown for clarity.

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9

Product Folder Links: TLC59108F