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PCA9555 Datasheet(PDF) 2 Page - NXP Semiconductors |
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PCA9555 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 22 page  Philips Semiconductors Product data sheet PCA9555 16-bit I2C and SMBus I/O port with interrupt 2 2004 Sep 30 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 stand-by current • Noise filter on SCL/SDA inputs • No glitch on power-up • Internal power-on reset • 16 I/O pins which default to 16 inputs • 0 kHz 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 JESDEC Standard JESD78 which exceeds 100 mA • Five packages offered: DIP24, SO24, SSOP24, TSSOP24, and HVQFN24 DESCRIPTION The PCA9555 is a 24-pin CMOS device that provide 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C/SMBus applications and was developed to enhance the Philips family of I @C I/O expanders. The improvements include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O configuration, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc. The PCA9555 consist of two 8-bit Configuration (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 configuration 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 I2C address compatible with the PCF8575, software changes are required due to the enhancements and are discussed in Application Note AN469. The PCA9555 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 fixed I2C address and allow up to eight devices to share the same I2C/SMBus. The fixed I2C address of the PCA9555 is the same as the PCA9554 allowing up to eight of these devices in any combination to share the same I2C/SMBus. ORDERING INFORMATION PACKAGES TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DRAWING NUMBER 24-Pin Plastic DIP –40 °C to +85 °C PCA9555N PCA9555 SOT101-1 24-Pin Plastic SO –40 °C to +85 °C PCA9555D PCA9555D SOT137-1 24-Pin Plastic SSOP –40 °C to +85 °C PCA9555DB PCA9555 SOT340-1 24-Pin Plastic TSSOP –40 °C to +85 °C PCA9555PW PCA9555 SOT355-1 24-Pin Plastic HVQFN –40 °C to +85 °C PCA9555BS 9555 SOT616-1 Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging. I2C is a trademark of Philips Semiconductors Corporation. SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I2C patent. |
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