{"id":3720,"date":"2026-06-08T02:19:45","date_gmt":"2026-06-08T02:19:45","guid":{"rendered":"https:\/\/materialparts.com\/pca9534apwr\/"},"modified":"2026-06-08T02:19:45","modified_gmt":"2026-06-08T02:19:45","slug":"pca9534apwr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/pca9534apwr\/","title":{"rendered":"PCA9534APWR"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The PCA9534APWR from Texas Instruments is an 8-bit I2C\/SMBus I\/O expander with interrupt output, configuration registers, and polarity inversion. Operating from 2.3V to 5.5V at 400kHz, it expands GPIO capability in a TSSOP-16 package.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n
\u0627\u0644\u0648\u0638\u064a\u0641\u0629<\/td>\n8-bit I2C I\/O Expander<\/td>\n<\/tr>\n
I\/O Pins<\/td>\n8 (individually configurable)<\/td>\n<\/tr>\n
\u0627\u0644\u0648\u0627\u062c\u0647\u0629<\/td>\nI2C \/ SMBus, 400kHz<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n2.3V to 5.5V<\/td>\n<\/tr>\n
\u0627\u0644\u062a\u064a\u0627\u0631 \u0627\u0644\u0627\u062d\u062a\u064a\u0627\u0637\u064a<\/td>\n1uA (max)<\/td>\n<\/tr>\n
I\/O Tolerance<\/td>\n5V<\/td>\n<\/tr>\n
Interrupt Output<\/td>\nOpen-drain, active-low<\/td>\n<\/tr>\n
Address Pins<\/td>\n3 (A0-A2, up to 8 devices)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40 to 85 C<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 8-bit GPIO expansion via I2C bus<\/li>\n
  • Individual I\/O direction configuration<\/li>\n
  • Polarity inversion register for input polarity control<\/li>\n
  • Open-drain interrupt output on input change<\/li>\n
  • 5V-tolerant I\/O pins<\/li>\n
  • 1uA maximum standby current<\/li>\n
  • Internal power-on reset<\/li>\n
  • Three address pins for up to 8 devices on one bus<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • LED control and status monitoring<\/li>\n
    • Button and switch input reading<\/li>\n
    • ACPI power switch control<\/li>\n
    • Industrial I\/O expansion<\/li>\n
    • Sensor and fan control interface<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The PCA9534APWR from Texas Instruments is an 8-bit I2C\/SMBus I\/O expander with interrupt output, configuration registers, and polarity inversion. Operating from 2.3V to 5.5V at 400kHz, it expands GPIO capability in a TSSOP-16 package. Key Specifications Function 8-bit I2C I\/O Expander I\/O Pins 8 (individually configurable) Interface I2C \/ SMBus, 400kHz Supply Voltage […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[],"chip_brand":[138],"class_list":["post-3720","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"8-bit I2C I\/O expander, 400kHz, 5V-tolerant I\/O, interrupt, 1uA standby, TSSOP-16","date_code":"","package_case":"TSSOP-16 (5.0 x 4.4 x 1.1 mm)","in_stock":7929,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/pca9534.pdf","price":"$0.77 @ 1ku","product_introduction":"The PCA9534APWR from Texas Instruments is an 8-bit I2C and SMBus I\/O expander that provides general-purpose remote I\/O expansion for microcontroller families via a two-wire serial interface. The device features 8 individually configurable I\/O pins that can be set as inputs or outputs through a configuration register. A polarity inversion register allows the input polarity to be reversed without external logic. An open-drain active-low interrupt output (INT) notifies the host controller when any input state changes, eliminating the need for continuous polling. Operating from 2.3V to 5.5V with 5V-tolerant I\/O pins, the device is compatible with both 3.3V and 5V systems. The maximum standby current of only 1uA makes it ideal for battery-powered applications. Three hardware address pins (A0-A2) allow up to eight devices to share the same I2C bus, and using both PCA9534 and PCA9534A allows up to 16 devices.","working_principle":"The PCA9534APWR operates as an I2C slave device providing 8 bits of remote GPIO expansion. Key subsystems include: (1) I2C Interface - a standard 2-wire slave interface (SDA, SCL) supporting 400kHz fast mode; device address is set by A0-A2 pins; (2) Configuration Register - 8 bits control the direction of each I\/O pin (0=output, 1=input); defaults to all inputs on power-up; (3) Output Register - 8 bits store the output data for pins configured as outputs; outputs are latched with high-current drive for LED driving; (4) Input Register - 8 bits read the current state of all I\/O pins; (5) Polarity Inversion Register - 8 bits allow individual polarity inversion of input pins; (6) Interrupt Logic - compares current input state with previous state; any change generates an active-low INT output; (7) Power-On Reset - initializes all registers to default values on power-up.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>A0<\/td>Input<\/td>Address bit 0<\/td><\/tr>
      2<\/td>A1<\/td>Input<\/td>Address bit 1<\/td><\/tr>
      3<\/td>A2<\/td>Input<\/td>Address bit 2<\/td><\/tr>
      4<\/td>P0<\/td>I\/O<\/td>I\/O pin 0<\/td><\/tr>
      5<\/td>P1<\/td>I\/O<\/td>I\/O pin 1<\/td><\/tr>
      6<\/td>P2<\/td>I\/O<\/td>I\/O pin 2<\/td><\/tr>
      7<\/td>P3<\/td>I\/O<\/td>I\/O pin 3<\/td><\/tr>
      8<\/td>VSS<\/td>Power<\/td>Ground<\/td><\/tr>
      9<\/td>P4<\/td>I\/O<\/td>I\/O pin 4<\/td><\/tr>
      10<\/td>P5<\/td>I\/O<\/td>I\/O pin 5<\/td><\/tr>
      11<\/td>P6<\/td>I\/O<\/td>I\/O pin 6<\/td><\/tr>
      12<\/td>P7<\/td>I\/O<\/td>I\/O pin 7<\/td><\/tr>
      13<\/td>INT<\/td>Output<\/td>Interrupt output (active low, open-drain)<\/td><\/tr>
      14<\/td>SCL<\/td>Input<\/td>I2C serial clock<\/td><\/tr>
      15<\/td>SDA<\/td>I\/O<\/td>I2C serial data<\/td><\/tr>
      16<\/td>VDD<\/td>Power<\/td>Supply voltage (2.3V to 5.5V)<\/td><\/tr><\/table>","application_scenarios":"
      • LED control: driving multiple LEDs from I2C with high-current latched outputs<\/li>
      • Button\/switch reading: monitoring multiple inputs with interrupt-driven change detection<\/li>
      • ACPI power switch control: power management in portable computers<\/li>
      • Industrial I\/O expansion: adding digital I\/O to PLCs and controllers<\/li>
      • Sensor and fan control: monitoring and controlling peripheral devices via I2C<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>PCA9534PWR<\/td>TSSOP-16<\/td>Different I2C address variant<\/td><\/tr>
        NXP<\/td>PCA9534PW<\/td>TSSOP-16<\/td>Original manufacturer, compatible<\/td><\/tr>
        TI<\/td>PCF8574APWR<\/td>TSSOP-16<\/td>Quasi-bidirectional, no config reg<\/td><\/tr>
        Microchip<\/td>MCP23008-E\/SS<\/td>SSOP-20<\/td>8-bit I2C expander with more features<\/td><\/tr>
        NXP<\/td>PCA9554APW<\/td>TSSOP-16<\/td>With internal I\/O pull-up resistors<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/3720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=3720"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/3720\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=3720"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=3720"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=3720"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=3720"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}