This from a person who has his own board to try?puff wrote:have you tried measuring output without divider? or changing divider for, say, 10K?
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This from a person who has his own board to try?puff wrote:have you tried measuring output without divider? or changing divider for, say, 10K?
russian wrote: Also checked with +12 power supply and Frankenso own 5v. This time I have perfect 5v power and same -0.6v offset on op-amp output.
Do not rememberaneox wrote:Did you find an answer? Issue resolved?
You learn every day.. Explains why they explicitly call it a "rail-to-rail output" op amp.kb1gtt wrote: Hmmm, it would appear that this type of rail to rail op-amp can't go to the rails. I see Vicr should limit the top end to between 4 and 4.2. So we are really lucky that it's going to 3.39v. From this datasheet http://www.ti.com/lit/ds/symlink/lmv324.pdf page 6
The solution for this has to be to get a rail to rail that will actually go to the rails, or live with the 4V max.
Why scale the input? Is not 4.8/4.95 good enough?kb1gtt wrote:I'm tempted to say we should scale the input
what is the full part number for our application?DaWaN wrote:The TI LMV934-N
i"ve just placed an order for a bunch of MCP6004-E/SL from Avnet Express (see https://octopart.com/search?q=MCP6004-E%2FSL), once I get those would offer them as an upgrade for existing boards.kb1gtt wrote:So I proclaim, that we should use the MCP6004 that DaWaN suggested.
The SENT protocol is designed for interfacing sensors to ECUs.kb1gtt wrote: I'm kind of dream of little boxes that you connect to the analog input sensor or digital outputs all connected with a digital bus, perhaps CAN or optical.
Using the same opamp on my design, I have the same behavior, about .2V.kb1gtt wrote:The input can go for that range, the issue is the output. That ST chip is much better about actually being a rail to rail chip. Is .2V either rail close enough? See page 6 for VCC = 5V found in aneox's link. Snippet below.