TCA9555 Datasheet, PDF (1/32 Pages) Texas Instruments – LOW VOLTAGE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

TCA9555
www.ti.com .............................................................................................................................................................. SCPS200A – JULY 2009 – REVISED JULY 2009
LOW VOLTAGE 16-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
FEATURES
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• Low Standby-Current Consumption of
3 µA Max
• 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
• Address by Three Hardware Address Pins for
Use of up to Eight Devices
PW PACKAGE
(TOP VIEW)
• 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)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
RTW PACKAGE
(TOP VIEW)
INT 1
A1 2
A2 3
P00 4
P01 5
P02 6
P03 7
P04 8
P05 9
P06 10
P07 11
GND 12
24 V_CC
23 SDA
22 SCL
21 A0
20 P17
19 P16
18 P15
17 P14
16 P13
15 P12
14 P11
13 P10
24 23 22 21 20 19
P00 ¹
P01 ²
P02 ³
P03 ⁴
P04 ⁵
P05 ⁶
Exposed
Center
Pad
18 _A0
17 _P17
16 P16
15 P15
14 P14
13 _P13
7 8 9 10 11 12
The exposed center pad, if used, must be
connected as a secondary ground or left
electrically open.
DESCRIPTION/ORDERING INFORMATION
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 [serial clock
(SCL), serial data (SDA)].
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. All registers can be read by the system master.
The system master can reset the TCA9555 in the event of a timeout or other improper operation by utilizing the
power-on reset feature, which puts the registers in their default state and initializes the I²C/SMBus state machine.
The TCA9555 open-drain interrupt (INT) output is activated when any input state differs from its corresponding
Input Port register state and is used to indicate to the system master that an input state has changed.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated