PCA9555DB,118 Datasheet

Interface - I/O Expanders


The PCA9555DB,118 is a 24-pin CMOS device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2 C-bus/SMBus applications and was developed to enhance the NXP Semiconductors family of I2 C-bus I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O conguration, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc. The PCA9555DB,118 consists of two 8-bit Conguration (Input or Output selection); Input, Output and Polarity Inversion (active HIGH or active LOW operation) registers. The system master can enable the I/Os as either inputs or outputs by writing to the I/O conguration bits. The data for each Input or Output is kept in the corresponding Input or Output register. The polarity of the read register can be inverted with the Polarity Inversion register. All registers can be read by the system master. Although pin-to-pin and I2 C-bus address compatible with the PCF8575, software changes are required due to the enhancements, and are discussed in Application Note AN469. The PCA9555DB,118,118 open-drain interrupt 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. The power-on reset sets the registers to their default values and initializes the device state machine. Three hardware pins (A0, A1, A2) vary the xed I2C-bus address and allow up to eight devices to share the same I2C-bus/SMBus. The xed I2C-bus address of the PCA9555DB,118 is the same as the PCA9554, allowing up to eight of these devices in any combination to share the same I2C-bus/SMBus. PCA9555DB,118 Features • Operating power supply voltage range of 2.3 V to 5.5 V• 5 V tolerant I/Os• Polarity Inversion register• Active LOW interrupt output• Low standby current• Noise lter on SCL/SDA inputs• No glitch on power-up• Internal power-on reset• 16 I/O pins which default to 16 inputs• 0 Hz to 400 kHz clock frequency• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA


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Manufacturer information


Diodes Incorporated is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets.
Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers.
Diodes’ corporate headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taiwan; Taoyuan City, Taiwan; Zhubei City, Taiwan; Manchester, England; and Neuhaus, Germany. Diodes’ wafer fabrication facilities are located in Manchester and Shanghai, China. Diodes has assembly and test facilities located in Shanghai, Jinan, Chengdu, and Yangzhou, China, as well as in Hong Kong, Neuhaus and Taipei. Additional engineering, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Manchester; Shanghai; Shenzhen, China; Seongnam-si, South Korea; and Munich, Germany, with support offices throughout the world.

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