Product Descriptions

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 devices to share the common two-wire I2C software protocol serial data bus. The fixed GPIO I2C-bus address is the same as the PCF8574 and the fixed EEPROM I2C-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 higher number of devices are required to share the same I2C-bus or an interrupt output is required.

Product Features

 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

 I2C-bus and SMBus interface logic

 Internal power-on reset

 Noise filter on SCL/SDA inputs

 Three address pins allowing up to eight devices on the I2C-bus/SMBus

 No glitch on power-up

 Supports hot insertion

 Power-up with all channels configured as inputs

 Low standby current

 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

Product 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 I2C-bus/SMBus

Specifications

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