PCA9500 2 8-bit I C-bus and SMBus I/O port with 2-kbit EEPROM Rev. 4.1 5 May 2017 Product data sheet 1. General description The PCA9500 is an 8-bit I/O expander with an on-board 2-kbit EEPROM. The I/O expander s eight quasi-bidirectional data pins can be independently assigned as inputs or outputs to monitor board level status or activate indicator devices such as LEDs. The system master writes to the I/O configuration bits in the same way as for the PCF8574. The data for each input or output is kept in the corresponding Input or Output register. The system master can read all registers. The EEPROM can be used to store error codes or board manufacturing data for read-back by application software for diagnostic purposes and is included in the I/O expander package. The PCA9500 has three address pins with internal pull-up resistors allowing up to eight 2 devices to share the common two-wire I C software protocol serial data bus. The fixed 2 2 GPIO I C-bus address is the same as the PCF8574 and the fixed EEPROM I C-bus address is the same as the PCF8582C-2, so the PCA9500 appears as two separate devices to the bus master. The PCA9500 supports hot insertion to facilitate usage in removable cards on backplane systems. The PCA9501 is an alternative to the functionally similar PCA9500 for systems where a 2 higher number of devices are required to share the same I C-bus or an interrupt output is required. 2. Features and benefits Eight general purpose input/output expander/collector Drop-in replacement for PCF8574 with integrated 2-kbit EEPROM Internal 256 8 EEPROM Self timed write cycle 4 byte page write operation 2 I C-bus and SMBus interface logic Internal power-on reset Noise filter on SCL/SDA inputs 2 Three address pins allowing up to eight devices on the I C-bus/SMBus No glitch on power-up Supports hot insertion Power-up with all channels configured as inputs Low standby currentPCA9500 NXP Semiconductors 2 8-bit I C-bus and SMBus I/O port with 2-kbit EEPROM Operating power supply voltage range of 2.5 V to 3.6 V 5 V tolerant inputs/outputs 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 Packages offered: SO16, TSSOP16, HVQFN16 3. Applications Board version tracking and configuration Board health monitoring and status reporting Multi-card systems in telecommunications, networking, and base station infrastructure equipment Field recall and troubleshooting functions for installed boards General-purpose integrated I/O with memory Drop-in replacement for PCF8574 with integrated 2-kbit EEPROM Bus master sees GPIO and EEPROM as two separate devices Three hardware address pins allow up to eight PCA9500s to be located in the same 2 I C-bus/SMBus PCA9500 All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2017. All rights reserved. Product data sheet Rev. 4.1 5 May 2017 2 of 29