I/O Expander. PCA9557 Datasheet

PCA9557 Expander. Datasheet pdf. Equivalent

Part PCA9557
Description Remote 8-Bit I2C and SMBus Low-Power I/O Expander
Feature Product Folder Sample & Buy Technical Documents Tools & Software Support & Community PCA9557 SC.
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Total Page 30 Pages
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PCA9557
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
PCA9557
SCPS133J – DECEMBER 2005 – REVISED JUNE 2014
PCA9557 Remote 8-Bit I2C and SMBus Low-Power I/O Expander With Reset and
Configuration Registers
1 Features
1 Low Standby Current Consumption of 1 μA Max
• I2C to Parallel Port Expander
• Operating Power-Supply Voltage Range of 2.3 V
to 5.5 V
• 5-V Tolerant I/O Ports
• 400-kHz Fast I2C Bus
• Three Hardware Address Pins Allow for Use of up
to Eight Devices on I2C/SMBus
• Lower-Voltage Higher-Performance Migration
Path for PCA9556
• Input/Output Configuration Register
• Polarity Inversion Register
• Active-Low Reset Input
• Internal Power-On Reset
• High-Impedance Open Drain on P0
• 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)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
2 Description
This 8-bit I/O expander for the two-line bidirectional
bus (I2C) is designed for 2.3-V to 5.5-V VCC
operation. The device provides general-purpose
remote I/O expansion for most microcontroller
families via the I2C interface [serial clock (SCL) and
serial data (SDA)].
The PCA9557 consists of one 8-bit configuration
(input or output selection), input port, output port, and
polarity inversion (active-high) registers. At power on,
the I/Os are configured as inputs. 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 device outputs (latched) have high-current drive
capability for directly driving LEDs. The device has
low current consumption.
Device Information(1)
PART NUMBEr
PACKAGE
BODY SIZE (NOM)
PCA9557
SSOP (16)
VQFN (16)
6.20 mm × 5.30 mm
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
D, DB, DGV, OR PW PACKAGE
(TOP VIEW)
RGV PACKAGE
(TOP VIEW)
RGY PACKAGE
(TOP VIEW)
SCL
SDA
A0
A1
A2
P0
P1
GND
1
2
3
4
5
6
7
8
16 VCC
15 RESET
14 P7
13 P6
12 P5
11 P4
10 P3
9 P2
16 15 14 13
A0 1
A1 2
A2 3
P0 4
12 P7
11 P6
10 P5
9 P4
5678
SDA 2 1
A0 3
A1 4
A2 5
P0 6
P1 7 8
16 15 RESET
14 P7
13 P6
12 P5
11 P4
9 10 P3
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.



PCA9557
PCA9557
SCPS133J – DECEMBER 2005 – REVISED JUNE 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Description ............................................................. 1
3 Revision History..................................................... 2
4 Description (Continued) ........................................ 3
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings ...................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Electrical Characteristics........................................... 5
6.5 I2C Interface Timing Requirements........................... 6
6.6 Reset Timing Requirements ..................................... 6
6.7 Switching Characteristics .......................................... 6
6.8 Typical Characteristics .............................................. 7
7 Parameter Measurement Information .................. 9
8 Detailed Description ............................................ 12
8.1 Functional Block Diagram ....................................... 12
8.2 Device Functional Modes........................................ 14
8.3 Programming........................................................... 15
8.4 Bus Transactions .................................................... 19
9 Application And Implementation........................ 21
9.1 Application Information............................................ 21
9.2 Typical Application ................................................. 21
10 Power Supply Recommendations ..................... 22
10.1 Power-On Reset Errata......................................... 22
11 Device and Documentation Support ................. 23
11.1 Trademarks ........................................................... 23
11.2 Electrostatic Discharge Caution ............................ 23
11.3 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 23
3 Revision History
Changes from Revision I (June 2008) to Revision J
Page
• Added RESET Errata section. .............................................................................................................................................. 14
• Added Power-On Reset Errata section. ............................................................................................................................... 22
2 Submit Documentation Feedback
Product Folder Links: PCA9557
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