The TCA9548APWR from Texas Instruments is an 8-channel I2C switch\/multiplexer with reset, allowing a single I2C master to communicate with up to 8 I2C slave devices sharing the same address in a TSSOP-24 package.<\/p>\n
| Funci\u00f3n<\/td>\n | 8-Channel I2C Switch \/ Multiplexer<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| I2C Channels<\/td>\n | 1 master to 8 downstream channels<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Tensi\u00f3n de alimentaci\u00f3n<\/td>\n | 1.65V to 5.5V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| I2C Clock Frequency<\/td>\n | 400 kHz (Fast Mode)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Address Pins<\/td>\n | 3 (A0-A2, 8 possible I2C addresses)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Reset Pin<\/td>\n | Yes (active LOW, RESET pin)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| ESD Protection<\/td>\n | HBM >2000V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Paquete<\/td>\n | TSSOP-24 (4.4mm width)<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||||||||||||||||||||||
| Temperatura de funcionamiento<\/td>\n | -40 to +85 C<\/td>\n<\/tr>\n<\/table>\nCaracter\u00edsticas<\/h2>\nAplicaciones<\/h2>\nProduct Overview The TCA9548APWR from Texas Instruments is an 8-channel I2C switch\/multiplexer with reset, allowing a single I2C master to communicate with up to 8 I2C slave devices sharing the same address in a TSSOP-24 package. Key Specifications Function 8-Channel I2C Switch \/ Multiplexer I2C Channels 1 master to 8 downstream channels Supply Voltage 1.65V […]<\/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-3787","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","chip_brand-ti"],"acf":{"brief_explanation":"8-ch I2C switch\/mux, 1.65-5.5V, 400kHz, 3 addr pins, reset, TSSOP-24","date_code":"","package_case":"TSSOP-24 (7.8 x 4.4 x 1.2 mm, PW package)","in_stock":9044,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tca9548a.pdf","price":"$1.25 @ 1ku","product_introduction":"The TCA9548APWR from Texas Instruments is an 8-channel I2C switch and multiplexer that enables a single I2C master to communicate with up to 8 independent I2C bus segments. The primary use case is when multiple I2C slave devices share the same I2C address (a common issue with sensors, EEPROMs, and other peripherals) - by connecting each device to a separate downstream channel, the master can select one channel at a time via I2C commands, avoiding address conflicts. The TCA9548A can also be used to isolate I2C bus segments with different voltage levels (each downstream channel can operate at a different voltage, as the TCA9548A has level-shifting capability), or to manage I2C bus capacitance by splitting a large bus into smaller segments. The device operates as an I2C slave itself with a configurable address (set by the A0-A2 pins, supporting up to 8 TCA9548A devices on the same master bus, for a total of 64 downstream channels). To select a downstream channel, the master writes to the TCA9548A's control register via I2C, setting the corresponding channel bit(s). Multiple channels can be selected simultaneously if needed. The active-low RESET pin provides a hardware method to deselect all channels. The bidirectional pass-gate switches on each channel support I2C Fast Mode (400kHz) with minimal propagation delay and no signal distortion. The device operates from 1.65V to 5.5V and is available in a TSSOP-24 package.","working_principle":"The TCA9548APWR operates as an 8-channel I2C bus switch controlled via I2C. Key subsystems include: (1) I2C Slave Interface - the TCA9548A appears as an I2C slave device on the upstream (master) bus; the 7-bit slave address is determined by the A0-A2 pins (base address 0x70 + A0-A2 setting); the master writes to the internal control register to select which downstream channels are connected; (2) Control Register - an 8-bit register where each bit corresponds to a downstream channel (bit 0 = channel 0, bit 7 = channel 7); when a bit is set to 1, the corresponding channel's SDA\/SCL switches are closed, connecting the downstream bus to the upstream bus; when 0, the channel is disconnected; multiple bits can be set simultaneously; (3) Pass-Gate Switches - each downstream channel has bidirectional pass-gate switches on both SDA and SCL lines; these switches are MOSFET pass transistors that conduct in both directions when enabled; when disabled, the downstream channel is completely isolated from the upstream bus; (4) Voltage Level Shifting - the TCA9548A can be powered from the upstream VCC, while each downstream channel operates at the voltage of its own pull-up supply; the pass gates accommodate voltage differences between channels; (5) Reset - the active-low RESET pin clears the control register to 0x00 (all channels deselected), providing a known state during system initialization or fault recovery.","pin_description":"
|