{"product_id":"pololu-usb-c-power-multiplexer-carrier-non-usb-priority","title":"Pololu USB-C Power Multiplexer Carrier - Non-USB Priority","description":"\u003cp\u003eThis \u003ca href=\"\/collections\/pololu\" title=\"Pololu\"\u003ePololu\u003c\/a\u003e carrier board for Texas Instruments' TPS2116 power multiplexer \u003cstrong\u003eallows seamless switching between two power sources\u003c\/strong\u003e of \u003cstrong\u003e1.6V to 5.5V\u003c\/strong\u003e with up to \u003cstrong\u003e2.5A of continuous current\u003c\/strong\u003e while blocking reverse current into either source.\u003c\/p\u003e\n\u003cp\u003eBy default, the mux selects the higher of the two input voltages, and it can also be configured to switch from the VIN1 supply to the VIN2 supply on command or when VIN1 falls below a pre-set voltage. In addition, this board serves as a \u003cstrong\u003ebreakout for a USB-C connector\u003c\/strong\u003e that can be used to supply the \u003cstrong\u003enon-preferred (VIN2) rail\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eA common application of these multiplexers is enabling a device to be powered by USB or an external power supply, automatically choosing the appropriate source based on what is connected.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis version of the TPS2116 carrier (usb09b) connects VBUS to VIN2 so that the non-USB power source (VIN1) has priority \u003c\/strong\u003e\u003cstrong\u003ewhen the board is used in priority mode.\u003c\/strong\u003e \u003ca href=\"\/products\/pololu-usb-c-power-multiplexer-carrier-usb-priority\" title=\"Pololu USB-C Power Multiplexer Carrier - USB Priority\"\u003eWe also stock a version where the USB power source is preferred in priority mode\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eUsing the power multiplexer\u003c\/h2\u003e\n\u003ch3\u003ePinout\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/Pololu_USB-C_Power_Multiplexer_Carrier_-_Non-USB_Priority_-_pinout_1.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVIN1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eChannel 1 power input. Can be connected to a 1.6 V to 5.5 V power source.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVIN2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eChannel 2 power input. Can be connected to a 1.6 V to 5.5 V power source. Connected to VBUS (USB 5 V supply) on this version of the board.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVOUT\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMultiplexed power output.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGND\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCommon ground for power supplies, load, and USB. All of the board’s GND pins are internally connected with each other and with GND from the USB connector.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMODE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMode control input. The board pulls this pin low, making the TPS2116 automatically select the higher of the two power sources by default. MODE can be tied high to enable priority or manual mode. See the Control inputs section below for more information.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePR1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSwitching control input. When MODE is high, VIN1 will be selected when PR1 is high and VIN2 will be selected when PR1 is low. The board pulls this pin low through a 15 kΩ resistor by default. See the Control inputs section below for more information.\u003cbr\u003e\u003cbr\u003eDriving PR1 high when MODE is low puts the TPS2116 into shutdown, where the output is turned off.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eST\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOpen-drain status output that indicates which input is currently connected to the output. This pin is high impedance when VIN1 is selected and drives low otherwise, when VIN2 is selected or the mux is in shutdown mode.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eD−\u003cbr\u003eD+\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB 2.0 data signals broken out from USB connector.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCC1\u003cbr\u003eCC2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB configuration channel signals broken out from USB connector. The board pulls both of these pins to GND through 5.11 kΩ termination resistors, making the USB-C port a power sink, or device, and upstream-facing port (UFP) by default.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe board’s through-holes are arranged with a 0.1″ spacing for compatibility with \u003ca href=\"\/collections\/solderless-breadboards\" title=\"solderless breadboards\"\u003esolderless breadboards\u003c\/a\u003e and \u003ca href=\"\/products\/break-away-0-1-36-pin-strip-male-header-black-10-pack\" title=\"0.1″-pitch headers\"\u003e0.1″-pitch headers\u003c\/a\u003e. The board has two mounting holes that work with #2 and M2 screws.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/Pololu_USB-C_Power_Multiplexer_Carrier_-_USB_Priority_-_in_breadboard_1.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003eControl inputs\u003c\/h3\u003e\n\u003cp\u003eThe MODE and PR1 pins can be used to override the default behaviour of the TPS2116.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eMODE\u003c\/strong\u003e pin determines the operating mode of the device. The board pulls this pin low by default, which results in auto-switching mode (sometimes called diode mode): the higher of the two input sources is automatically selected (connected to VOUT).\u003c\/p\u003e\n\u003cp\u003eHowever, when MODE is high, the selected input source is controlled by the \u003cstrong\u003ePR1\u003c\/strong\u003e pin instead: a voltage on PR1 above 1 V causes VIN1 to be selected (connected to VOUT), while a PR1 voltage below 1 V selects VIN2. You can drive the PR1 pin from an external source, such as an output pin from a microcontroller, to directly control the multiplexer’s switching (manual mode).\u003c\/p\u003e\n\u003cp\u003eAlternatively, the precise nature of the PR1 pin’s 1 V threshold makes it possible to use an external resistor to set a desired switching threshold for VIN1. By tying MODE to VIN1 (or otherwise driving it high) and connecting this external resistor between PR1 and VIN1, a voltage divider is created with the on-board 15 kΩ PR1 pull-down resistor, and the board will operate in priority mode, selecting VIN1 as long as the output of this voltage divider is greater than 1 V. (If PR1 drops below the 1 V threshold, the multiplexer switches to VIN2 regardless of whether VIN2 is lower or higher than VIN1.)\u003c\/p\u003e\n\u003cp\u003eThe value of the added resistor determines the voltage at which the behaviour of the multiplexer changes, as defined by the following equation:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eV_threshold = (R \/ 15 kΩ + 1) * 1 V\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor 5V applications, adding a 47 kΩ resistor works well, since that sets the threshold to about 4.13V.\u003c\/p\u003e\n\u003cp\u003eIf PR1 is driven high while MODE is low, the TPS2116 turns off the output and enters a low-power shutdown state.\u003c\/p\u003e\n\u003ch3\u003ePower connections without USB\u003c\/h3\u003e\n\u003cp\u003eIf you want to select from between two general power supplies, you can connect one power source across VIN1 and GND and the other across VIN2 and GND. The voltages on these power inputs can be 1.6 V to 5.5 V. The load should be connected across VOUT and GND and should draw no more than 2.5 A.\u003c\/p\u003e\n\u003cp\u003eIn this configuration, the power supply connected to VIN1 is the preferred power source if MODE and PR1 are high. (Note that both versions of the TPS2116 board behave the same in applications without USB; they differ only in which input is connected to the USB 5 V supply.)\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/Pololu_USB-C_Power_Multiplexer_Carrier_-_USB_Priority_-_Power_connections_without_USB_1.jpg\" width=\"1000\" height=\"769\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch3\u003ePower connections with USB\u003c\/h3\u003e\n\u003cp\u003eThe USB-C connector makes it easy to use USB as one of the two power sources. On this board (usb09b), the VBUS line from the USB connector is tied to VIN2. This allows you to power your circuit from either USB or an external power source connected to VIN1, with VIN1 as the preferred power source if MODE and PR1 are high.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/Pololu_USB-C_Power_Multiplexer_Carrier_-_Non-USB_Priority_-_Power_connections_with_USB_1.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eWarning\u003c\/strong\u003e: It is important to be aware that while this board might appear to have three power inputs, two of those three are tied together (there are only two independent power inputs to the TPS2116). As such, \u003cstrong\u003eyou must take care to avoid creating a short circuit between USB power and an external power supply.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor example, if you use this version with USB connected, any external power supply must be connected to VIN2; connecting it to VIN1 will create a short between this power supply and USB power.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eOther usage considerations\u003c\/h3\u003e\n\u003cp\u003eThis TPS2116 carrier board includes a 4.7μF capacitor on each of the two power inputs (VIN1 and VIN2). However, \u003cstrong\u003ewe strongly recommend adding additional capacitance\u003c\/strong\u003e to each input (an electrolytic capacitor of at least 33 μF is a good starting point) if you are switching more than a few hundred milliamps of current or if your power leads are longer than about 6 inches (150 mm). Otherwise, the rapid switching of current can cause LC voltage spikes that are much higher than the input voltage, and if these spikes exceed the maximum voltage rating of the TPS2116 (6 V), the chip can be destroyed.\u003c\/p\u003e\n\u003cp\u003eIf the TPS2116 switches between power sources while the load is drawing substantial current, the new source’s voltage might drop with the applied load while the old source’s voltage rises as the load is removed. If this happens in priority mode with PR1 connected to a voltage divider on VIN1, the changing voltages could make PR1 cross the 1 V threshold again, and the multiplexer might start switching between the two inputs repeatedly (exacerbating the previously-mentioned LC spikes).\u003c\/p\u003e\n\u003cp\u003eTo mitigate this behaviour, you can add hysteresis to the switchover threshold by connecting an additional resistor between PR1 and ST. For example, with a divider on PR1 that includes a 47 kΩ pull-up and a 15 kΩ pull-down, adding a 1 MΩ resistor adds about 50 mV of hysteresis. \u003ca href=\"https:\/\/www.ti.com\/tool\/download\/PMUX-SWITCHOVER-CALC\" rel=\"noopener\" title=\"This Microsoft Excel-based tool from TI\" target=\"_blank\"\u003eThis Microsoft Excel-based tool from TI\u003c\/a\u003e can help calculate an appropriate hysteresis resistor for other scenarios (use the sheet named “TPS2116”).\u003c\/p\u003e\n\u003cp\u003eFinally, additional capacitance on VOUT can help reduce how much the output voltage drops while the TPS2116 switches. The board includes a 4.7μF capacitor on VOUT, but high-current applications might benefit from 100 μF or more of extra capacitance.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1″ × 0.55″ × 0.18″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum operating voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum operating voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous output current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB dev codes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eusb09b\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther PCB markings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0J15948\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eResources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/a.pololu-files.com\/picture\/0J14027.1200.png?aca90da2fdf9ba6efd7ed53be6842d4b\" rel=\"noopener\" title=\"Pololu USB-C Power Multiplexer Carrier - USB Priority Schematic\" target=\"_blank\"\u003eSchematic\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/file\/0J2236\/tps2116-power-mux-with-usb-type-c-dimensions.pdf\" rel=\"noopener\" title=\"Dimension diagram of the TPS2116 Power Multiplexer Carrier with USB Type-C Connector\" target=\"_blank\"\u003eDimensions (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/file\/0J2237\/tps2116-power-mux-with-usb-type-c.step\" rel=\"noopener\" title=\"3D model of the TPS2116 Power Multiplexer Carrier with USB Type-C Connector\" target=\"_blank\"\u003e3D Model (STEP)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pololu.com\/file\/0J2238\/usb09-drill.dxf\" rel=\"noopener\" title=\"Drill guide for the TPS2116 Power Multiplexer Carrier with USB Type-C Connector\" target=\"_blank\"\u003eDrill Guide (DXF)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.ti.com\/lit\/gpn\/tps2116\" rel=\"noopener\" title=\"TPS2116 datasheet\" target=\"_blank\"\u003eTPS2116 datasheet\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.ti.com\/tool\/download\/PMUX-SWITCHOVER-CALC\" rel=\"noopener\" title=\"Power mux design calculator\" target=\"_blank\"\u003ePower mux design calculator\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Pololu USB-C Power Multiplexer Carrier - \u003cstrong\u003eNon-USB Priority\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pololu","offers":[{"title":"Default Title","offer_id":55814353682817,"sku":"POL-3729","price":4.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0176\/3274\/files\/pololu-usb-c-power-multiplexer-carrier-non-usb-priority-pololu-pol-3729-1245089181.jpg?v=1781786859","url":"https:\/\/thepihut.com\/products\/pololu-usb-c-power-multiplexer-carrier-non-usb-priority","provider":"The Pi Hut","version":"1.0","type":"link"}