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  1. K

    How will a car 10A circuit deal with double load?

    Previous measurements were from the right side brake lamp circuit. The add-on I am looking to build will be hooked up to the same brake lamp circuit. Today I have measured drawn amps for the same right side brake lamp: 1.56 A Then masured DMM probes resistance at ~0.4 ohm which translates into...
  2. K

    How will a car 10A circuit deal with double load?

    Is it, perhaps, wrong to extrapolate the same amperage @ lower voltage ?
  3. K

    How will a car 10A circuit deal with double load?

    Good catch! I have measured 11.8V at the tail lights connector without load, engine off. Battery was 12.2V. II need this working down to a battery voltage level of 10.5V which is about the time when car batteries get swapped. That would make probably 10.1V without load at tail lights connector...
  4. K

    How will a car 10A circuit deal with double load?

    Well, I have taken some measurements and run some calculations on them today, which ultimately resulted in ~0.9 V drop on the wires. I guesstimated some 5m of wire run of my standard looking hatchback. According to this calculator the dimension that corresponds to that voltage drop over that...
  5. K

    How will a car 10A circuit deal with double load?

    The brake lamp circuit is generally fused at 10A on most passenger cars. Since incandescent light bulbs present inrush currents of about 10x their steady state currents, I am guessing these fuses are slow fuses. One such bulb will steadily draw 1.5 - 2A. I am looking to using that same circuit...
  6. K

    Naughty circuit breaker situation

    Happy new year all! Ever since I had put in a WiFi controlled relay at a led light outside, trouble has begun... My setup: It was on a Christmas day, family was waiting for me, I think I... have not made very good contacts at WR in the diagram above :-) - Few days after CB0 started...
  7. K

    crystal, oscillator problem ?

    I asked Max. Int. support last week; no answer: So, in case anyone out there is struggling, try changing PWNMODE bits.
  8. K

    crystal, oscillator problem ?

    Tried with 47 uF, 100 uF, 220 uF accross the uC power input, no joy. One of the caps even made things worse (probably high ESR, it has been on the shelf for years). Also tried adding 3.3 nF + 15 pF in parallel to the transmitter's 100 nF bypass, no joy either. As a sidenote, typical transmitter...
  9. K

    EP5R marking

    Perhaps not ? I have 7 characters marked in total "EP5R" and "HAC" on the part; the XC9259 appears to only have 5.
  10. K

    crystal, oscillator problem ?

    Hello Harald, I am using the 3rd way. The other two are for different chips anyway (excellent datasheet...). There are 100 nFs bypasing both the uC and the MAX. Perhaps not enough storage capacity ? There is no oscilloscope on my bench :(. Same behaviour observed when supplying power from...
  11. K

    EP5R marking

    second line reads HAC I think it is a MEMS sensor of some sort, LGA package. Couldn't find it through online part search engines... if someone knows of it, please tell. Thanks
  12. K

    crystal, oscillator problem ?

    Working with this radio transmitter MAX41460. It is supposed to output a signal on its CLKOUT pin for the MCU to interrupt on and shift out radio bits. It works fine when MCU (ATTiny88) runs at 2 or 4 MHz from its internal RC oscillator, but that is too slow for the workload. 8 MHz would be...
  13. K

    this evil I2C monster scoffing at me from its minute package

    Has anyone had any interaction with the supplier from the link above ? Mine was not the greatest, I tend to think they are only a .ca facade for the Chinese warehouses...
  14. K

    this evil I2C monster scoffing at me from its minute package

    Or, perhaps not... the I2C lines are both pulled down by the MEMS I2C slave - as far as my logic analyzer can tell. Leaving the SDA and SCL open show correct operation on the master side. Even more, on both test boards the resistance between VDD and GND pads reads around 640 ohm. Have I...
  15. K

    this evil I2C monster scoffing at me from its minute package

    Thank you, I suspect it is not the level shifter though. Just tried it with a Nucleo board which can do 3v3 natively, thus I have ditched the level shifter. None of the boards would budge. I have not put 2.7 k's but 3.3 k's. Speed was 9.4 kHz, so , really... This is the first time I deal with...
  16. K

    this evil I2C monster scoffing at me from its minute package

    It is this little guy - a MEMS sensor in its WLP-4 package. Setup: - Arduino Uno R3 - some 30 cm of wires - home etched breakboards for the culprit sensor (two of them) - Logic level shifter 5V - 3.3V: My mosfet is 2N7000 with 9k1 pullups. Works just fine for SPI, this being its first go...
  17. K

    LGA / MEMS / magnetic sensors - why do I see them fail so much ?

    Yeah, I sound like I am skilled, but reality contradicts... - The chips I am buying from a well known distributor and are produced by reputed or ok vendors. I took note on the 125 deg limit and reprogrammed my oven to do 90 deg for 23h. I managed getting it to operate in the 87 - 94 deg...
  18. K

    LGA / MEMS / magnetic sensors - why do I see them fail so much ?

    I think it is the die that is susceptible to cracking, not the enclosing plastic, and I don't think going over 125 a bit would be that much of an issue. After all, these can withstand 260 C for a couple of reflows. What I do know is that without baking them the failure rate is higher. Surely...
  19. K

    LGA / MEMS / magnetic sensors - why do I see them fail so much ?

    Aww, come on! good idea with the test fixture but these are not so easy to find. Only found one on ebay for some $75. And it says QFN16 not LGA16... Got other sources ? L.E. Oh, build it you say... I immediately thought about those socket adapters... Ok how do I build these ? I got some...
  20. K

    LGA / MEMS / magnetic sensors - why do I see them fail so much ?

    i know these kind of sensors are sensitive but, man... how do they fail so easily ?! My procedure: - bake the MEMS sensors @ 125 deg C for 9 hours (dry out phase) - apply solder paste over the boards through an electropolished stencil - place the sensors by hand as straight as I can then put...
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