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TCA9539
SCPS202C – OCTOBER 2009 – REVISED MAY 2016
TCA9539 Low Voltage 16-Bit I2C and SMBus Low-Power I/O Expander with Interrupt
Output, Reset Pin, and Configuration Registers
1 Features
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3 Description
The TCA9539 is a 24-pin device that provides 16 bits
of general purpose parallel input and output (I/O)
expansion for the two-line bidirectional I2C bus (or
SMBus protocol). The device can operate with a
power supply voltage (VCC) range from 1.65 V to 5.5
V. The device supports 100-kHz (I2C Standard mode)
and 400-kHz (I2C Fast mode) clock frequencies. I/O
expanders such as the TCA9539 provide a simple
solution when additional I/Os are needed for
switches, sensors, push-buttons, LEDs, fans, and
other similar devices.
2
I C to Parallel Port Expander
Low Standby-Current Consumption
Open-Drain Active-Low Interrupt Output
Active-Low Reset Input
5-V Tolerant I/O Ports
Compatible With Most Microcontrollers
400-kHz Fast I2C Bus
Input and Output Configuration Register
Polarity Inversion Register
Internal Power-on Reset
No Glitch on Power Up
Noise Filter on SCL and SDA Inputs
Address by Two Hardware Address Pins for Use
of up to Four Devices
Latched Outputs With High-Current Drive
Capability for Directly Driving LEDs
Latch-Up Performance Exceeds 100 mA Per
JESD 78, Class II
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 1000-V Charged-Device Model (C101)
The features of the TCA9539 include an interrupt that
is generated on the INT pin whenever an input port
changes state. The A0 and A1 hardware selectable
address pins allow up to four TCA9539 devices on
the same I2C bus. The device can be reset to its
default state by cycling the power supply and causing
a power-on-reset. Also, the TCA9539 has a hardware
RESET pin that can be used to reset the device to its
default state.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TSSOP (24)
2 Applications
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7.80 mm × 4.40 mm
WQFN (24)
4.00 mm × 4.00 mm
VQFN (24)
TCA9539
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Servers
Routers (Telecom Switching Equipment)
Personal Computers, smartphones
Industrial Automation
I2C GPIO Expansion
Simplified Schematic
VCC
2
I C or SMBus
Master
(e.g. Processor)
SDA
SCL
INT
RESET
Peripheral Devices
P00
P01
x
TCA9539
x
A0
A1
GND
P17
x
/RESET,
ENABLE,
or control
inputs
/INT or
status
outputs
LEDs
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
