This device is ideal for systems with different ground potentials, allowing uninterrupted communication through large common mode transients faster than 50kV/μs.įor more information, visit. The LDO output is nominally 5V but may be overdriven.Ĭoupled inductors provide 7500V RMS of isolation between the input and output logic interface. The module includes an integrated transformer driver on the logic side and an LDO on the isolated side to regulate the rectified transformer output. Overview Features and Benefits Product Details iso Power integrated, isolated dc-to-dc converter Regulated 3.15 V to 5. Module options are available with compatibility to SPI (LTM2810-S) and I 2C (LTM2810-I), master mode only, specifications. Separate logic supply pins allow easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply. IcSeek is specializing in FPGA, MCU, RF ICs. Individual 3V to 5.5V supplies power each side of the digital isolator. The Electronic components distributor with huge selection new & original in stock and ready to ship same day. It's something you need to consider and consider it strongly.The LTM2810 is a complete galvanic digital µModule (micromodule) isolator. There could be a lot of induced voltage due to these components sharing pathways with regular AC power signals. My biggest worry is the commoning up of all the thermistors located around your house to the common point on the ADC. ADI's ADuM540x range does this and also provide the isolated IO for the device: -īe aware that the isolated power than can be provided is limited so, whatever you choose for pull-up resistors be economical in taking current. You do need an isolated power supply for the isolated side of the circuit - consider using an isolating dc-dc converter or find an isolator that generates isolated power. The common pin has to be within +/- 0.2 volts of the ground pin - see "Absolute Input Range" on pin 3 and note that "Negative Input" refers to the common pin. Voltage reference? Do i link GND and COM? If you buffer the reference voltage output you can use this as your pull-up point for the pull-up resistors then you gain accuracy in that the measurements are ratiometric.Thermistors are just resistors so you need a pull-up resistor to the local supply in order to generate a signal voltage that can be measured by the ADC.The ADC has an internal reference voltage that is quite suitable for reasonably accurate measurements so please consider ditching the external reference unless you have some cunning plan in mind that is not apparent from your question.But i guess using it also to power the voltage reference is not a good idea because the relays can cause noise and voltage fluctuation? What about the power for the voltage reference? I already have a dedicated power supply for the relay board to have real isolation. Not connecting GND to the supply and voltage reference? Do i link GND and COM? The ideal layout will include an analog ground planeĭedicated to the converter and associated analog circuitry. Too near the grounding point of a microcontroller or digital signal In manyĬases, this will be the "analog" ground. The GND pin should be connected to a clean ground point. What if i need to read 6V? I guess i need a voltage divider? Order to provide full dynamic range for a 0V to +Vdd analog input. If a +5V supply is used, an external +5V reference is required in I have the Adafruit LM4040 voltage reference here but it has only 4.096V. This are the values of the different thermistors (not all because i can't post more then 2 links): I have the ADC ADS7830 and the digital isolator MAX14850. I want to read the temps from my central heating system.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |