XRA1402 8-BIT SPI GPIO EXPANDER SEPTEMBER 2011 REV. 1.0.0 FEATURES GENERAL DESCRIPTION 1.65V to 3.6V operating voltage The XRA1402 is an 8-bit GPIO expander with an SPI interface. After power-up, the XRA1402 has internal 8 General Purpose I/Os (GPIOs) 100K ohm pull-up resistors on each I/O pin that can 5V tolerant inputs be individually enabled. Maximum stand-by current of 1uA at +1.8V In addition, the GPIOs on the XRA1402 can individually be controlled and configured. As outputs, SPI bus interface the GPIOs can be outputs that are high, low or in SPI Clock Frequency up to 26MHz three-state mode. The three-state mode feature is useful for applications where the power is removed Individually programmable inputs from the remote devices, but they may still be Internal pull-up resistors connected to the GPIO expander. Polarity inversion As inputs, the internal pull-up resistors can be Individual interrupt enable enabled or disabled and the input polarity can be Rising edge and/or Falling edge interrupt inverted. The interrupt can be programmed for different behaviors. The interrupts can be Input filter programmed to generate an interrupt on the rising Individually programmable outputs edge, falling edge or on both edges. The interrupt Output Level Control can be cleared if the input changes back to its original state or by reading the current state of the inputs. Output Three-State Control The XRA1402 is available in 16-pin QFN and 16-pin Open-drain active low interrupt output TSSOP packages. Active-low reset input 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 Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com XRA1402 8-BIT SPI GPIO EXPANDER REV. 1.0.0 FIGURE 1. XRA1402 BLOCK DIAGRAM VCC (1.65V 3.6V) P0 CS P1 SCL P2 GPIO SI SPI Bus P3 Control GPIOs Interface P4 SO Registers P5 P6 RESET P7 IRQ GND ORDERING INFORMATION NUMBER OF OPERATING TEMPERATURE PART NUMBER PACKAGE DEVICE STATUS GPIOS RANGE XRA1402IL16-F QFN-16 8 -40C to +85C Active XRA1402IL16TR-F QFN-16 8 -40C to +85C Active XRA1402IG16-F TSSOP-16 8 -40C to +85C Active XRA1402IG16TR-F TSSOP-16 8 -40C to +85C Active NOTE: TR = Tape and Reel, F = Green / RoHS FIGURE 2. PIN OUT ASSIGNMENTS - XRA1402 CS 1 16 VCC SI 2 15 SO 16 15 14 13 SCL 12 RESET 1 RESET 3 14 SCL 11 IRQ 2 P0 XRA1402 P0 4 13 IRQ XRA1402 16-Pin QFN 10 P7 3 P1 16-Pin TSSOP P1 5 12 P7 9 P6 P2 4 6 P2 11 P6 5 678 P3 7 10 P5 GND 9 P4 8 2 P3 SI GND CS P4 VCC P5 SO