TCA9555_16 Datasheet, PDF (1/46 Pages) Texas Instruments – Low-Voltage 16-Bit I2C and SMBus I/O Expander with Interrupt Output and Configuration Registers

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TCA9555
SCPS200D – JULY 2009 – REVISED JULY 2016
TCA9555 Low-Voltage 16-Bit I²C and SMBus I/O
Expander with Interrupt Output and Configuration Registers
1 Features
•1 Low Standby-Current Consumption of
3.5 μA Maximum
• I²C to Parallel Port Expander
• Open-Drain Active-Low Interrupt Output
• 5-V Tolerant I/O Ports
• Compatible With Most Microcontrollers
• 400-kHz Fast I²C Bus
• Configurable Slave Address with 3 Address Pins
• Polarity Inversion Register
• 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)
2 Applications
• Servers
• Routers (Telecom Switching Equipment)
• Personal Computers
• Personal Electronics
• Industrial Automation Equipment
• Products with GPIO-Limited Processors
3 Description
This 16-bit I/O expander for the two-line bidirectional
bus (I²C) is designed for 1.65-V to 5.5-V V_CC
operation. It provides general-purpose remote I/O
expansion for most microcontroller families via the I²C
interface.
The TCA9555 consists of two 8-bit Configuration
(input or output selection), Input Port, Output Port,
and Polarity Inversion (active high or active low
operation) registers. At power on, the I/Os are
configured as inputs. The system master can enable
the I/Os as either inputs or outputs by writing to the
I/O configuration bits. The data for each input or
output is kept in the corresponding Input or Output
register. The polarity of the Input Port register can be
inverted with the Polarity Inversion register.
PART NUMBER
TCA9555
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
TSSOP (24)
7.80 mm x 4.40 mm
SSOP (24)
6.20 mm x 5.30 mm
WQFN (24)
4.00 mm x 4.00 mm
VQFN (24)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
I²C or SMBus Master
(e.g. Processor)
1
VCC
P00
SDA
P01
SCL
P02
INT
P03
P04
P05
P06
P07
TCA9555
P10
P11
P12
P13
A2
P14
A1
P15
A0
P16
GND
P17
Peripheral
Devices
x RESET, EN or
Control Inputs
x INT or status
outputs
x LEDs
x Keypad
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.