1 Features

1• Seven LED Driver Outputs: ON, OFF, Blinking,

Fading at Programmable Rates

• Open-Drain Outputs Directly Drive LEDs to

40-mA Maximum

• Two Independent Banks of LED Drivers

• Widely Programmable Blink Rates, Fade-ON and

Fade-OFF Rates and Maximum Intensity

• Outputs Not Used as LED Drivers Can Be Used

as Regular General-Purpose Open-Drain Outputs

• 16 Steps of Maximum Intensity Control from

Fully-OFF to Fully-ON States

• Smooth Perceived Transitions for Fade-ON and

Fade-OFF

• Operating Power-Supply Voltage Range of

1.65 V to 3.6 V

• 5.5-V Tolerant Open-Drain Outputs

• Low Standby Current With Shutdown Capability

for Additional Power Savings

• Programmed Through I2C Bus Interface Logic

Compatible With SMBus

• No Glitch on Power Up

• ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

• Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

2 Applications

• Mobile Phones

• Desktop and Laptop Computers

• Human Machine Interface

3 Description

This 7-bit LED dimmer for the two-line bidirectional

bus (I2C) is designed to control (or dim) LEDs through

the I2C interface. Without this device, the

microcontroller must be actively involved in turning on

and off the LEDs (per the required dimming rate),

which uses valuable processor time. The TCA6507

alleviates this issue by limiting the number of

operations required by the processor in blinking LEDs

and helps to create a more efficient system. The

TCA6507 handles all pulse width modulation (PWM)

logic, allowing the processor to use its cycles for

more important tasks.