Analog Devices LTC4316 I2C address translation board with JST EH connectorsDesigned by Mycrobits in United States of America
The Analog Devices LTC4316 is an amazing problem solving chip. It isolates and translates (2.5 to 5V) I2C lines and allows you to hardware program the translation bit. If you are running out of I2C a…Read More…
The Analog Devices LTC4316 is an amazing problem solving chip. It isolates and translates (2.5 to 5V) I2C lines and allows you to hardware program the translation bit. If you are running out of I2C addresses or have a conflict this may be your easy solution. If you aren't sure how to deal with JST EH connectors digikey has individual wires crimped with EH connections as well as the housings they get pushed into.
Side note We have a crimper so I may sell pre made cables as well at some point. Using JST connectors for my projects solved so many problems I will never go back to hobby jumpers. You can cut one cable set in half and use hard soldered wired on one side and JST on the other if you don't want to add JST to your other boards. Or you could always remove the JST EH headers.
So what's the story? I had these made when I needed one more I2C address than I had available when using PCF8574N and AN I2C expanders. The alternatives were not great and this made it easy. If you needed an additional 16 addresses or more it would make even more sense.
Seems like these would be all over the place. I see someone with a dual version up now, but there was no one offering anything when I needed it. Mine comes with the precision resistors (unsoldered) to set it to 00010000 or 0x40. See page 9 of the datasheet. It can be resistor/hardware programmed for whatever translation bit works best in your system if 0x40 isn't convenient. Just use 1% resistors to avoid errors. There are pads to place resistors as pull ups on the incoming and outgoing sides of the bus but they are not included as they may or may not be needed for your circuit.
So what's included and what will I need to know? The first picture is the part as it will arrive to you. The board and 2 precision resistors to set the board to 0x40 translation bit. The second pic shows a fully stuffed board including incoming and outgoing I2C pullups which are not included. Please note the board calls out R3/RLT as 887 and R4/RLB as 1k. Actual values are 887K and 1M. The reason for this is a mistaken reading of the datasheet. If you check table 2 and 3 on page 9 you will notice that the values are listed as Kohm at the top of the column. This caused me no end of problems in testing when I was using values off by a factor of 1k. I have never seen a column of resistors notated in this way before so it caught me by surprise. At any rate the values on the board match the values called out in the datasheet. Just please be aware of those values needing to be multiplied by the heading of the columns or 1k. I2C connections are IN at the edge of the board with OUT being the other connector. From the top of the board down (as it is printed) the I2C pins are SCL SDA V(2.25-5.5) GND for both JST headers.
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