PCA9554DW Datasheet, PDF (1/36 Pages) Texas Instruments – REMOTE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS

Not Recommended for New Designs
PCA9554
www.ti.com ........................................................................................................................................................ SCPS128B – JULY 2006 – REVISED AUGUST 2008
REMOTE 8-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
FEATURES
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• I²C to Parallel Port Expander
• Open-Drain Active-Low Interrupt Output
• Operating Power-Supply Voltage Range of
2.3 V to 5.5 V
• 5-V Tolerant I/Os
• 400-kHz Fast I²C Bus
• Three Hardware Address Pins Allow up to
Eight Devices on the I²C/SMBus
• Input/Output Configuration Register
• Polarity Inversion Register
• Internal Power-On Reset
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
• Power-Up With All Channels Configured as
Inputs
• No Glitch On Power Up
• 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)
RGV PACKAGE
(TOP VIEW)
RGT PACKAGE
(TOP VIEW)
A0 1
A1 2
A2 3
P0 4
P1 5
P2 6
P3 7
GND 8
16 V_CC
15 SDA
14 _SCL
13 INT
12 P7
11 P6
10 P5
9 _P4
16 15 14 13
A2 1
12 SCL
P0 2
11 INT
P1 3
10 P7
P2 4
9 P6
567 8
16 15 14 13
A2 1
12 SCL
P0 2
11 INT
P1 3
10 P7
P2 4
9 P6
567 8
DESCRIPTION/ORDERING INFORMATION
This 8-bit I/O expander for the two-line bidirectional bus (I²C) is designed for 2.3-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 PCA9554 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 V_CC.
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 PCA9554 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 PCA9554 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.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the
remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via
the I²C bus. Thus, the PCA9554 can remain a simple slave device.
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PRODUCTION DATA information current as of publication date.
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