PCA9501 | NXP Semiconductors

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8-Bit I2C-Bus and SMBus I/O Port with Interrupt, 2-Kbit EEPROM and 6 Address Pins

PCA9501
Active

The PCA9501 is an 8-bit I/O expander with an on-board 2-kbit EEPROM.

The I/O expandable 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 leader 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 leader 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 are included in the I/O expander package.

The PCA9501 active LOW open-drain interrupt output is activated when any input state differs from its corresponding input port register state. It is used to indicate to the system leader that an input state has changed and the device needs to be interrogated.

The PCA9501 has six address pins with internal pull-up resistors allowing up to 64 devices to share the common two-wire I²C-bus software protocol serial data bus. The fixed GPIO address starts with '0' and the fixed EEPROM I²C-bus address starts with '1', so the PCA9501 appears as two separate devices to the bus leader.

The PCA9501 supports hot insertion to facilitate usage in removable cards on backplane systems.

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Block Diagram

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PCA9501 Block Diagram

PCA9501 Block Diagram

Block diagram: PCA9501BS, PCA9501D, PCA9501PW

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Features

Key Features

  • 8 general purpose input/output expander/collector
  • Replacement for PCF8574 with integrated 2-kbit EEPROM
  • Internal 256 x 8 EEPROM
  • Self timed write cycle (5 ms typical)
  • 16 byte page write operation
  • I²C-bus and SMBus interface logic
  • Internal power-on reset
  • Noise filter on SCL/SDA inputs
  • Active LOW interrupt output
  • 6 address pins allowing up to 64 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: SO20, TSSOP20, HVQFN20

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N true 0 PSPPCA9501en 15 Application Note Application Note t789 4 Data Sheet Data Sheet t520 1 Package Information Package Information t790 3 Packing Information Packing Information t935 2 Supporting Information Supporting Information t531 2 Training Presentation Training Presentation t878 1 User Guide User Guide t792 2 en_US en_US en Data Sheet Data Sheet 1 1 4.0 English 1442059599097716646535 PSP 173.6 KB None None documents None 1442059599097716646535 /docs/en/data-sheet/PCA9501.pdf 173610 /docs/en/data-sheet/PCA9501.pdf PCA9501 documents N N 2011-06-30 8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins /docs/en/data-sheet/PCA9501.pdf /docs/en/data-sheet/PCA9501.pdf Data Sheet N 980000996212993340 2022-12-07 pdf N en Feb 10, 2009 980000996212993340 Data Sheet Y N 8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins Application Note Application Note 4 2 1.0 English 1442088353543707144903 PSP 92.3 KB Registration without Disclaimer None documents Extended 1442088353543707144903 /secured/assets/documents/en/application-note/AN256.pdf 92326 /secured/assets/documents/en/application-note/AN256.pdf AN256 documents Y N 2016-07-11 AN256: PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus /webapp/Download?colCode=AN256 /secured/assets/documents/en/application-note/AN256.pdf Application Note N 645036621402383989 2024-10-21 pdf Y en Mar 23, 2009 645036621402383989 Application Note Y N AN256: PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus 3 2.0 English 1442088835091717295604 PSP 301.0 KB None None documents None 1442088835091717295604 /docs/en/application-note/AN469.pdf 300951 /docs/en/application-note/AN469.pdf AN469 documents N N 2011-06-30 AN469 /docs/en/application-note/AN469.pdf /docs/en/application-note/AN469.pdf Application Note N 645036621402383989 2022-12-07 pdf N en Jan 20, 2005 645036621402383989 Application Note Y N AN469 4 1.0 English 1442087689485731980491 PSP 4.3 MB None None documents None 1442087689485731980491 /docs/en/application-note/AN10216.pdf 4320295 /docs/en/application-note/AN10216.pdf AN10216 documents N N 2016-07-05 AN10216 /docs/en/application-note/AN10216.pdf /docs/en/application-note/AN10216.pdf Application Note N 645036621402383989 2024-10-21 pdf N en Mar 27, 2003 645036621402383989 Application Note Y N AN10216 5 2.0 English 1442089481077718749151 PSP 2.3 MB None None documents None 1442089481077718749151 /docs/en/application-note/AN10146.pdf 2284625 /docs/en/application-note/AN10146.pdf AN10146 documents N N 2011-06-30 AN10146 /docs/en/application-note/AN10146.pdf /docs/en/application-note/AN10146.pdf Application Note N 645036621402383989 2024-10-21 pdf N en Feb 26, 2003 645036621402383989 Application Note Y N AN10146 User Guide User Guide 2 6 6.0 Japanese 1442125286808710770774ja PSP 751.0 KB None None documents None 1442125286808710770774 /docs/ja/user-guide/UM10204.pdf 750958 /docs/ja/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/ja/user-guide/UM10204.pdf /docs/ja/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 ja Apr 28, 2014 132339537837198660 User Guide Y N I2C-bus specification and user manual 7.0 English NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. 1442125286808710770774 PSP 751.0 KB None None documents None 1442125286808710770774 /docs/en/user-guide/UM10204.pdf 750958 /docs/en/user-guide/UM10204.pdf UM10204 documents N N 2016-07-12 I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf /docs/en/user-guide/UM10204.pdf User Guide N 132339537837198660 2024-10-24 pdf N en Oct 1, 2021 132339537837198660 User Guide Y N I2C-bus specification and user manual 7 1.0 English 1442125429801702674389 PSP 749.6 KB Registration without Disclaimer None documents Extended 1442125429801702674389 /secured/assets/documents/en/user-guide/UM10528.pdf 749626 /secured/assets/documents/en/user-guide/UM10528.pdf UM10528 documents Y N 2012-02-06 PCA9632 demonstration board OM13269 /webapp/Download?colCode=UM10528 /secured/assets/documents/en/user-guide/UM10528.pdf User Guide N 132339537837198660 2025-02-10 pdf Y en Feb 6, 2012 132339537837198660 User Guide Y N PCA9632 demonstration board OM13269 Package Information Package Information 3 8 1.0 English 1455078603712720580365 PSP 310.8 KB None None documents None 1455078603712720580365 /docs/en/package-information/SOT360-1.pdf 310839 /docs/en/package-information/SOT360-1.pdf SOT360-1 documents N N 2016-02-12 plastic thin shrink small outline package; 20 leads; body width 4.4 mm /docs/en/package-information/SOT360-1.pdf /docs/en/package-information/SOT360-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic thin shrink small outline package; 20 leads; body width 4.4 mm 9 1.0 English 1455079670029721489839 PSP 213.9 KB None None documents None 1455079670029721489839 /docs/en/package-information/SOT662-1.pdf 213918 /docs/en/package-information/SOT662-1.pdf SOT662-1 documents N N 2016-02-12 plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm /docs/en/package-information/SOT662-1.pdf /docs/en/package-information/SOT662-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm 10 1.0 English plastic small outline package; 20 leads; body width 7.5 mm 1455079171621724647129 PSP 343.2 KB None None documents None 1455079171621724647129 /docs/en/package-information/SOT163-1.pdf 343226 /docs/en/package-information/SOT163-1.pdf SOT163-1 documents N N 2016-02-12 plastic small outline package; 20 leads; body width 7.5 mm /docs/en/package-information/SOT163-1.pdf /docs/en/package-information/SOT163-1.pdf Package Information N 302435339416912908 2024-10-21 pdf N en Feb 8, 2016 302435339416912908 Package Information Y N plastic small outline package; 20 leads; body width 7.5 mm Packing Information Packing Information 2 11 1.0 English 1442131203291729471151 PSP 272.0 KB None None documents None 1442131203291729471151 /docs/en/packing/SOT662-1_118.pdf 271965 /docs/en/packing/SOT662-1_118.pdf SOT662-1_118 documents N N 2013-04-18 HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT662-1_118.pdf /docs/en/packing/SOT662-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 18, 2013 145666923842250347 Packing Information Y N HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 12 4.0 English 1442131717959689109779 PSP 230.0 KB None None documents None 1442131717959689109779 /docs/en/packing/SOT360-1_118.pdf 230045 /docs/en/packing/SOT360-1_118.pdf SOT360-1_118 documents N N 2013-04-17 TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT360-1_118.pdf /docs/en/packing/SOT360-1_118.pdf Packing Information N 145666923842250347 2024-10-21 pdf N en Apr 15, 2013 145666923842250347 Packing Information Y N TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 Training Presentation Training Presentation 1 13 0.1 English DesignCon 2003 TecForum I2C Bus Overview 1463807226428719028720 PSP 4.4 MB None None documents None 1463807226428719028720 /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf 4351144 /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf DESIGN_CON_2003_TECFORUM_I2C_B_1 documents N N 2016-07-13 DesignCon 2003 TecForum I²C-Bus Overview /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf Training Presentation N 501713016990820713 2025-02-04 pdf N en Jan 27, 2003 501713016990820713 Training Presentation Y N DesignCon 2003 TecForum I²C-Bus Overview Supporting Information Supporting Information 2 14 1.0 English Reflow Soldering temperature profile 1442122749741692602431 PSP 34.6 KB None None documents None 1442122749741692602431 /docs/en/supporting-information/Reflow_Soldering_Profile.pdf 34577 /docs/en/supporting-information/Reflow_Soldering_Profile.pdf REFLOW_SOLDERING_PROFILE documents N N 2016-10-08 Reflow Soldering Profile /docs/en/supporting-information/Reflow_Soldering_Profile.pdf /docs/en/supporting-information/Reflow_Soldering_Profile.pdf Supporting Information N 371282830530968666 2024-11-28 pdf N en Feb 17, 2014 371282830530968666 Supporting Information Y N Reflow Soldering Profile 15 1.0 English SSOP, TSSOP & VSO FOOTPRINT (WAVE SOLDERING) 1442126381432716559822 PSP 16.6 KB None None documents None 1442126381432716559822 /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf 16645 /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf SSOP-TSSOP-VSO-WAVE documents N N 2016-10-08 Footprint for wave soldering /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf Supporting Information N 371282830530968666 2024-10-21 pdf N en Oct 8, 2009 371282830530968666 Supporting Information Y N Footprint for wave soldering false 0 PCA9501 downloads en true 1 Y PSP Y Y Application Note 4 /secured/assets/documents/en/application-note/AN256.pdf 2016-07-11 1442088353543707144903 PSP 2 Mar 23, 2009 Application Note Registration without Disclaimer /secured/assets/documents/en/application-note/AN256.pdf English documents 92326 None 645036621402383989 2024-10-21 Y /webapp/Download?colCode=AN256 AN256: PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus /secured/assets/documents/en/application-note/AN256.pdf documents 645036621402383989 Application Note N en Extended Y pdf 1.0 Y N AN256: PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus 92.3 KB AN256 N 1442088353543707144903 /docs/en/application-note/AN469.pdf 2011-06-30 1442088835091717295604 PSP 3 Jan 20, 2005 Application Note None /docs/en/application-note/AN469.pdf English documents 300951 None 645036621402383989 2022-12-07 N /docs/en/application-note/AN469.pdf AN469 /docs/en/application-note/AN469.pdf documents 645036621402383989 Application Note N en None Y pdf 2.0 N N AN469 301.0 KB AN469 N 1442088835091717295604 /docs/en/application-note/AN10216.pdf 2016-07-05 1442087689485731980491 PSP 4 Mar 27, 2003 Application Note None /docs/en/application-note/AN10216.pdf English documents 4320295 None 645036621402383989 2024-10-21 N /docs/en/application-note/AN10216.pdf AN10216 /docs/en/application-note/AN10216.pdf documents 645036621402383989 Application Note N en None Y pdf 1.0 N N AN10216 4.3 MB AN10216 N 1442087689485731980491 /docs/en/application-note/AN10146.pdf 2011-06-30 1442089481077718749151 PSP 5 Feb 26, 2003 Application Note None /docs/en/application-note/AN10146.pdf English documents 2284625 None 645036621402383989 2024-10-21 N /docs/en/application-note/AN10146.pdf AN10146 /docs/en/application-note/AN10146.pdf documents 645036621402383989 Application Note N en None Y pdf 2.0 N N AN10146 2.3 MB AN10146 N 1442089481077718749151 Data Sheet 1 /docs/en/data-sheet/PCA9501.pdf 2011-06-30 1442059599097716646535 PSP 1 Feb 10, 2009 Data Sheet None /docs/en/data-sheet/PCA9501.pdf English documents 173610 None 980000996212993340 2022-12-07 N /docs/en/data-sheet/PCA9501.pdf 8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins /docs/en/data-sheet/PCA9501.pdf documents 980000996212993340 Data Sheet N en None Y pdf 4.0 N N 8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins 173.6 KB PCA9501 N 1442059599097716646535 Package Information 3 /docs/en/package-information/SOT360-1.pdf 2016-02-12 1455078603712720580365 PSP 8 Feb 8, 2016 Package Information None /docs/en/package-information/SOT360-1.pdf English documents 310839 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT360-1.pdf plastic thin shrink small outline package; 20 leads; body width 4.4 mm /docs/en/package-information/SOT360-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic thin shrink small outline package; 20 leads; body width 4.4 mm 310.8 KB SOT360-1 N 1455078603712720580365 /docs/en/package-information/SOT662-1.pdf 2016-02-12 1455079670029721489839 PSP 9 Feb 8, 2016 Package Information None /docs/en/package-information/SOT662-1.pdf English documents 213918 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT662-1.pdf plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm /docs/en/package-information/SOT662-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 5 x 5 x 0.85 mm 213.9 KB SOT662-1 N 1455079670029721489839 /docs/en/package-information/SOT163-1.pdf 2016-02-12 1455079171621724647129 PSP 10 Feb 8, 2016 Package Information plastic small outline package; 20 leads; body width 7.5 mm None /docs/en/package-information/SOT163-1.pdf English documents 343226 None 302435339416912908 2024-10-21 N /docs/en/package-information/SOT163-1.pdf plastic small outline package; 20 leads; body width 7.5 mm /docs/en/package-information/SOT163-1.pdf documents 302435339416912908 Package Information N en None Y pdf 1.0 N N plastic small outline package; 20 leads; body width 7.5 mm 343.2 KB SOT163-1 N 1455079171621724647129 Packing Information 2 /docs/en/packing/SOT662-1_118.pdf 2013-04-18 1442131203291729471151 PSP 11 Apr 18, 2013 Packing Information None /docs/en/packing/SOT662-1_118.pdf English documents 271965 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT662-1_118.pdf HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT662-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 1.0 N N HVQFN20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 272.0 KB SOT662-1_118 N 1442131203291729471151 /docs/en/packing/SOT360-1_118.pdf 2013-04-17 1442131717959689109779 PSP 12 Apr 15, 2013 Packing Information None /docs/en/packing/SOT360-1_118.pdf English documents 230045 None 145666923842250347 2024-10-21 N /docs/en/packing/SOT360-1_118.pdf TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 /docs/en/packing/SOT360-1_118.pdf documents 145666923842250347 Packing Information N en None Y pdf 4.0 N N TSSOP20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118 230.0 KB SOT360-1_118 N 1442131717959689109779 Supporting Information 2 /docs/en/supporting-information/Reflow_Soldering_Profile.pdf 2016-10-08 1442122749741692602431 PSP 14 Feb 17, 2014 Supporting Information Reflow Soldering temperature profile None /docs/en/supporting-information/Reflow_Soldering_Profile.pdf English documents 34577 None 371282830530968666 2024-11-28 N /docs/en/supporting-information/Reflow_Soldering_Profile.pdf Reflow Soldering Profile /docs/en/supporting-information/Reflow_Soldering_Profile.pdf documents 371282830530968666 Supporting Information N en None Y pdf 1.0 N N Reflow Soldering Profile 34.6 KB REFLOW_SOLDERING_PROFILE N 1442122749741692602431 /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf 2016-10-08 1442126381432716559822 PSP 15 Oct 8, 2009 Supporting Information SSOP, TSSOP & VSO FOOTPRINT (WAVE SOLDERING) None /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf English documents 16645 None 371282830530968666 2024-10-21 N /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf Footprint for wave soldering /docs/en/supporting-information/SSOP-TSSOP-VSO-WAVE.pdf documents 371282830530968666 Supporting Information N en None Y pdf 1.0 N N Footprint for wave soldering 16.6 KB SSOP-TSSOP-VSO-WAVE N 1442126381432716559822 Training Presentation 1 /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf 2016-07-13 1463807226428719028720 PSP 13 Jan 27, 2003 Training Presentation DesignCon 2003 TecForum I2C Bus Overview None /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf English documents 4351144 None 501713016990820713 2025-02-04 N /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf DesignCon 2003 TecForum I²C-Bus Overview /docs/en/supporting-information/design_con_2003_tecforum_i2c_bus_overview.pdf documents 501713016990820713 Training Presentation N en None Y pdf 0.1 N N DesignCon 2003 TecForum I²C-Bus Overview 4.4 MB DESIGN_CON_2003_TECFORUM_I2C_B_1 N 1463807226428719028720 User Guide 2 /docs/en/user-guide/UM10204.pdf 2016-07-12 1442125286808710770774 PSP 6 Oct 1, 2021 User Guide NXP Semiconductors developed a simple bidirectional 2-wire bus for efficient inter-IC control. This bus is called the Inter-IC or I2C-bus. Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3.4 Mbit/s in the High-speed mode. None /docs/en/user-guide/UM10204.pdf English documents 750958 None 132339537837198660 2024-10-24 N /docs/en/user-guide/UM10204.pdf I2C-bus specification and user manual /docs/en/user-guide/UM10204.pdf documents 132339537837198660 User Guide N en None Y pdf 7.0 N N I2C-bus specification and user manual 751.0 KB UM10204 N 1442125286808710770774 /secured/assets/documents/en/user-guide/UM10528.pdf 2012-02-06 1442125429801702674389 PSP 7 Feb 6, 2012 User Guide Registration without Disclaimer /secured/assets/documents/en/user-guide/UM10528.pdf English documents 749626 None 132339537837198660 2025-02-10 Y /webapp/Download?colCode=UM10528 PCA9632 demonstration board OM13269 /secured/assets/documents/en/user-guide/UM10528.pdf documents 132339537837198660 User Guide N en Extended Y pdf 1.0 Y N PCA9632 demonstration board OM13269 749.6 KB UM10528 N 1442125429801702674389 true Y Products

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