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TCA9554A датащи(PDF) 1 Page - Texas Instruments

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номер детали TCA9554A
подробное описание детали  LOW VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TCA9554A датащи(HTML) 1 Page - Texas Instruments

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TCA9554A
www.ti.com
SCPS196 – DECEMBER 2010
LOW VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
Check for Samples: TCA9554A
1
FEATURES
I2C to Parallel Port Expander
Power-Up With All Channels Configured as
Inputs
Open-Drain Active-Low Interrupt Output
No Glitch on Power Up
Operating Power-Supply Voltage Range of
1.65 V to 5.5 V
Latched Outputs With High-Current Drive
Maximum Capability for Directly Driving LEDs
5-V Tolerant I/Os
Latch-Up Performance Exceeds 100 mA Per
400-kHz Fast I2C Bus
JESD 78, Class II
Three Hardware Address Pins Allow up to
ESD Protection Exceeds JESD 22
Eight Devices on the I2C/SMBus
2000-V Human-Body Model (A114-A)
Input/Output Configuration Register
200-V Machine Model (A115-A)
Polarity Inversion Register
1000-V Charged-Device Model (C101)
Internal Power-On Reset
DESCRIPTION/ORDERING INFORMATION
This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 1.65-V to 5.5-V VCC operation. It
provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock
(SCL), serial data (SDA)].
The TCA9554A consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity
Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup
to VCC. However, 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 TCA9554A 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 TCA9554A 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.
1
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.
Copyright © 2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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