PCA9701; PCA9702

General description

The PCA9701/PCA9702 are low power 18 V tolerant SPI General Purpose Input (GPI) shift register designed to monitor the status of switch inputs. It generates an interrupt when one or more of the switch inputs change state. The input level is recognized as a HIGH when it is greater than 0.7 x V_DD and as a LOW when it is less than 0.4 x V_DD (minimum threshold of 2 V at 5 V node). The PCA9701 can monitor up to 16 switch inputs and the PCA9702 can monitor up to 8 switch inputs.

The falling edge of the CS pin samples the input port status and clears the interrupt. When CS is LOW, the rising edge of the SCLK loads the shift register and shifts the value out of the shift register. The serial input is sampled on the falling edge of SCLK.

Each of the input ports has a 18 V breakdown ESD protection circuit. When used with a series resistor (minimum 100 kOhm), the input can connect to a 12 V battery and support double battery, reverse battery, 27 V jump start and 40 V load dump conditions in automotive applications. Higher voltages can be tolerated on the inputs depending on the series resistor used to limit the input current.

With both the high breakdown voltage and high ESD, these devices are useful for both automotive (AEC-Q100 compliance available) and mobile applications.

The PCA9703/PCA9704 are new pin compatible devices for the PCA9701/PCA9702 which have an interrupt masking feature allowing selected inputs to not generate interrupts and provides higher ground offset of 0.55 x V_DD (minimum of 2.5 V at 5 V node) with minimum hysteresis of 0.05 x V_DD (minimum of 225 mV at 5 V node).

Features

• 16 general purpose input ports (PCA9701) or 8 general purpose input ports (PCA9702)
• 18 V tolerant input ports with 100 kOhm external series resistor
• Input LOW threshold 0.4 x V_DD with minimum of 2 V at V_DD = 4.5 V
• Open-drain interrupt output
• Interrupt enable pin (INT_EN) disables interrupt output
• V_DD range: 2.5 V to 5.5 V
• I_DD is very low 2.5 uA maximum
• SPI serial interface with speeds up to 5 MHz
• AEC-Q100 compliance available
• ESD protection exceeds 8 kV HBM per JESD22-A114, 350 V MM per AEC-Q100, and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
• Operating temperature range: -40 Cel to +125 Cel
• PCA9701 offered in SO24, TSSOP24 and HWQFN24 packages
• PCA9702 offered in TSSOP16 package

Products/packages

The variants in the table below are discontinued. See the table Discontinued information for more information.

Quality/reliability/chemical content

The variants in the table below are discontinued. See the table Discontinued information for more information.

Quality and reliability disclaimer

Pricing/ordering/availability

Discontinued information

Applications

• Body control modules
• Switch monitoring
• Industrial equipment
• Cellular telephones
• Emergency lighting
• SBC wake pin extension

Related applications
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Design support

Application Notes

AN10441; Level shifting techniques in I2C-bus design (2007-06-20)

AN256; PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (2009-03-23)

Support Documents

UM10206; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

UM10204; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

UM10267; PCA9698 demonstration board OM6281 (2008-09-26)

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer