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.