Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
XRA1202
8-BIT I2C/SMBUS GPIO EXPANDER WITH RESET
SEPTEMBER 2011 REV. 1.0.0
GENERAL DESCRIPTION
The XRA1202 is an 8-bit GPIO expander with an I
2
C/
SMBus interface. After power-up, the XRA1202 has
internal 100K ohm pull-up resistors on each I/O pin
that can be individually enabled.
In addition, the GPIOs on the XRA1202 can
individually be controlled and configured. As outputs,
the GPIOs can be outputs that are high, low or in
three-state mode. The three-state mode feature is
useful for applications where the power is removed
from the remote devices, but they may still be
connected to the GPIO expander.
As inputs, the internal pull-up resistors can be
enabled or disabled and the input polarity can be
inverted. The interrupt can be programmed for
different behaviors. The interrupts can be
programmed to generate an interrupt on the rising
edge, falling edge or on both edges. The interrupt
can be cleared if the input changes back to its original
state or by reading the current state of the inputs.
The XRA1202 is an enhanced version of the
PCA9538. The XRA1202 is pin and software
compatible with the PCA9538 (note: software
registers are compatible to the PCA9538, but the I
2
C
slave address is different).
The XRA1202 is available in 16-pin QFN and 16-pin
TSSOP packages.
FEATURES
• 1.65V to 3.6V operating voltage
• 8 General Purpose I/Os (GPIOs)
• 5V tolerant inputs
• Maximum stand-by current of 1uA at +1.8V
• I
2
C/SMBus bus interface
■ I
2
C clock frequency up to 400kHz
■ Noise filter on SDA and SCL inputs
■ Up to 16 I
2
C Slave Addresses
• Individually programmable inputs
■ Internal pull-up resistors
■ Polarity inversion
■ Individual interrupt enable
■ Rising edge and/or Falling edge interrupt
■ Input filter
• Individually programmable outputs
■ Output Level Control
■ Output Three-State Control
• Open-drain active low interrupt output
• Active-low reset input
• Pin and software compatible with PCA9538
• 3kV HBM ESD protection per JESD22-A114F
• 200mA latch-up performance per JESD78B
APPLICATIONS
• Personal Digital Assistants (PDA)
• Cellular Phones/Data Devices
• Battery-Operated Devices
• Global Positioning System (GPS)
• Bluetooth
