{"id":10732,"date":"2026-07-20T11:13:21","date_gmt":"2026-07-20T11:13:21","guid":{"rendered":"https:\/\/ic-vendor.com\/tca9538pwr\/"},"modified":"2026-07-20T11:13:21","modified_gmt":"2026-07-20T11:13:21","slug":"tca9538pwr","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/ar\/tca9538pwr\/","title":{"rendered":"TCA9538PWR"},"content":{"rendered":"

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

The TCA9538PWR from Texas Instruments is a low-voltage 8-bit I2C I\/O expander with interrupt output and configuration registers, housed in a 16-pin TSSOP package. It provides general-purpose remote I\/O expansion for most microcontroller families via the I2C serial interface, operating from 1.65 V to 5.5 V.<\/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
Number of I\/O<\/td>\n8 (bidirectional)<\/td>\n<\/tr>\n
\u0646\u0637\u0627\u0642 \u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n1.65 \u0641\u0648\u0644\u062a \u0625\u0644\u0649 5.5 \u0641\u0648\u0644\u062a<\/td>\n<\/tr>\n
\u0627\u0644\u0648\u0627\u062c\u0647\u0629<\/td>\nI2C (up to 400 kHz)<\/td>\n<\/tr>\n
I2C Addresses<\/td>\n2 (A0 pin selectable)<\/td>\n<\/tr>\n
Interrupt Output<\/td>\nActive-low<\/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 degC<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTSSOP-16 (5.0 x 4.4 mm)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • I2C interface up to 400 kHz (Fast-mode)<\/li>\n
  • 8 configurable I\/O pins with polarity inversion register<\/li>\n
  • Active-low interrupt output on input change<\/li>\n
  • Internal power-on reset initializes registers to defaults<\/li>\n
  • Input\/output configuration register for per-pin direction<\/li>\n
  • 1.65-V to 5.5-V supply voltage range<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • GPIO expansion for microcontrollers with limited I\/O<\/li>\n
    • LED and button matrix control<\/li>\n
    • Industrial control panel interfaces<\/li>\n
    • Server health monitoring<\/li>\n
    • Consumer electronics peripheral control<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TCA9538PWR from Texas Instruments is a low-voltage 8-bit I2C I\/O expander with interrupt output and configuration registers, housed in a 16-pin TSSOP package. It provides general-purpose remote I\/O expansion for most microcontroller families via the I2C serial interface, operating from 1.65 V to 5.5 V. Key Specifications Number of I\/O 8 (bidirectional) […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[2072],"chip_brand":[138],"class_list":["post-10732","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-tca9538pwr","chip_brand-ti"],"acf":{"brief_explanation":"8-bit I2C I\/O expander, 1.65-5.5V, interrupt output, TSSOP-16","date_code":"","package_case":"TSSOP-16 (5.0 x 4.4 x 1.2 mm)","in_stock":5689,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tca9538.pdf","price":"$0.72 @ 1ku","product_introduction":"The TCA9538PWR from Texas Instruments is an 8-bit I\/O expander that provides general-purpose remote I\/O expansion for most microcontroller families via the I2C serial interface. It features 8 bidirectional I\/O pins with per-pin direction control through a configuration register, a polarity inversion register, and an active-low interrupt output that alerts the host when any input changes state. The device operates from 1.65 V to 5.5 V, making it compatible with both low-voltage logic and standard 5-V systems. Two address pins allow up to two TCA9538 devices on the same I2C bus.","working_principle":"The TCA9538PWR communicates with the host microcontroller through a standard I2C interface at up to 400 kHz. The device contains eight registers: Input Port, Output Port, Polarity Inversion, Configuration, and additional control registers. Each of the 8 I\/O pins can be individually configured as input or output via the Configuration register. When configured as input, the pin state is read through the Input Port register. When configured as output, the Output Port register sets the pin state. The Polarity Inversion register allows bitwise inversion of the input data. The interrupt output (INT) is asserted active-low whenever any input pin changes state from its previous read value.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>P0<\/td>I\/O<\/td>I\/O port bit 0<\/td><\/tr>
      2<\/td>P1<\/td>I\/O<\/td>I\/O port bit 1<\/td><\/tr>
      3<\/td>P2<\/td>I\/O<\/td>I\/O port bit 2<\/td><\/tr>
      4<\/td>P3<\/td>I\/O<\/td>I\/O port bit 3<\/td><\/tr>
      5<\/td>P4<\/td>I\/O<\/td>I\/O port bit 4<\/td><\/tr>
      6<\/td>P5<\/td>I\/O<\/td>I\/O port bit 5<\/td><\/tr>
      7<\/td>P6<\/td>I\/O<\/td>I\/O port bit 6<\/td><\/tr>
      8<\/td>P7<\/td>I\/O<\/td>I\/O port bit 7<\/td><\/tr>
      9<\/td>A0<\/td>Input<\/td>Address select input<\/td><\/tr>
      10<\/td>SDA<\/td>I\/O<\/td>I2C serial data<\/td><\/tr>
      11<\/td>SCL<\/td>Input<\/td>I2C serial clock<\/td><\/tr>
      12<\/td>INT<\/td>Output<\/td>Interrupt output (active low)<\/td><\/tr>
      13<\/td>VCC<\/td>Power<\/td>Supply voltage<\/td><\/tr>
      14<\/td>GND<\/td>Power<\/td>Ground<\/td><\/tr>
      15-16<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr><\/table>","application_scenarios":"
      • GPIO expansion for pin-limited microcontrollers<\/li>
      • LED status indicator and button matrix control<\/li>
      • Industrial control panel input\/output interfaces<\/li>
      • Server health monitoring and fan control<\/li>
      • Consumer electronics peripheral power and signal routing<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>TCA9554PWR<\/td>TSSOP-16<\/td>16-bit I2C I\/O expander<\/td><\/tr>
        NXP<\/td>PCAL9538DP<\/td>TSSOP-16<\/td>Pin-compatible with latch<\/td><\/tr>
        TI<\/td>TCA6408PWR<\/td>TSSOP-16<\/td>8-bit with more address pins<\/td><\/tr>
        Microchip<\/td>MCP23008-E\/SO<\/td>SOIC-18<\/td>8-bit I2C expander, SPI variant<\/td><\/tr>
        NXP<\/td>PCA9538DP<\/td>TSSOP-16<\/td>Original 9538 variant<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10732","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/comments?post=10732"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/posts\/10732\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/media?parent=10732"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/categories?post=10732"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/tags?post=10732"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=10732"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}