TCA9538 Datasheet, PDF (1/37 Pages) Texas Instruments – Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander

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TCA9538
SCPS199C – AUGUST 2014 – REVISED OCTOBER 2015
TCA9538 Low Voltage 8-Bit I²C and SMBus Low-Power I/O Expander With Interrupt
Output, Reset, and Configuration Registers
1 Features
•1 Low Standby Current Consumption
• I²C to Parallel Port Expander
• Open-Drain Active-Low Interrupt Output
• Active-Low Reset Input
• Operating Power-Supply Voltage Range of 1.65 V
to 5.5 V
• 5-V Tolerant I/O Ports
• 400-kHz Fast I²C Bus
• Two Hardware Address Pins Allow up to Four
Devices on the I²C/SMBus
• Input/Output Configuration Register
• Polarity Inversion Register
• Power-Up With All Channels Configured as Inputs
• No Glitch on Power Up
• Noise Filter on SCL/SDA Inputs
• Latched Outputs With High-Current Drive
Maximum 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)
2 Applications
• Servers
• Routers (Telecom Switching Equipment)
• Personal Computers
• Personal Electronics (e.g. Gaming Consoles)
• Industrial Automation
• Products With GPIO-Limited Processors
3 Description
The TCA9538 is a 16-pin device that provides 8 bits
of general purpose parallel input/output (I/O)
expansion for the two-line bidirectional I²C bus (or
SMBus) protocol. The device can operate with a
power supply voltage ranging from 1.65 V to 5.5 V.
The device supports both 100-kHz (Standard-mode)
and 400-kHz (Fast-mode) clock frequencies. I/O
expanders such as the TCA9538 provide a simple
solution when additional I/Os are needed for
switches, sensors, push-buttons, LEDs, fans, etc.
The features of the TCA9538 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 TCA9538 devices on
the same I²C bus. The device can also be reset to its
default sate by using the RESET feature or by cycling
the power supply and causing a power-on reset.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TCA9538
TSSOP (16)
SSOP (16)
5.00 mm × 4.40 mm
6.20 mm × 5.30 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Block Diagram
I2C or SMBus
Master
(e.g. Processor)
VCC
SDA
SCL
INT
P0
P1
P2
RESET _TCA9538
P3
P4
P5
P6
A0
P7
A1
GND
Peripheral
Devices
• RESET,
ENABLE, or
control
inputs
• INT or
status
outputs
• LEDs
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.