Difference between revisions of "Upd 219 imu"
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=ECOs= | =ECOs= |
Revision as of 02:28, 7 August 2009
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Contents
ECOs
ADC OVERVOLTAGE ECO (COMPLETED ON #1-#3)
The circuit to measure the supply voltage causes an over voltage condition on the ADCs - corrupting all measurements.
- replace R43 w/1.0meg resistor
ADXR610 fullscale / bandwidth ECO
- Remove R45 (267k) - changes max rate of ADXRS610
- Change C56 to 6.31nF (no standard value of CAPS, might use 5.6nF+400pF? or 6.7nF....)
- this pair of modifications results in the ADXRS610 BW = 140hz.
IMU
- w/Cout=33nF, and R45=267, Bw=45 hz
- All signals have 1.6Khz BW going into dSPIC
- IDG300 internal RC filter of 140 Hz - internal drive freq >= 10khz. should choose sample rate to move peak into high end of digital sample band.
1
- 7-13-09 : changed R43 to 1.0meg
- 7-3-09 : location IW. reprogram with firmware that supports command 2020
- 6-26-09 : location CEB lab
- 6-23-09 : seems to be working
- 1-24-09 : boots and can reprogram - this will be the IMU development device.
- 1-24-09 : removed broken jumper wires from GND to R28. Shorted Q4 gate to ground.
- 1-24-09 : is missing pushbutton switch and is missing PB pad. Remain 3 pads don't seem to be enough to switch the system on.
2
- 7-13-09 : changed R43 to 1.0meg
- 7-10-09 : switcher replaced.
- 7-2-09 : IMU#2 - doesn't power with either of 2 cables. probably due to review polarity cable - probably needs new switcher.
- 6-23-09 : seems to be working with 'blue' cable w/red and black marks on connector
- 1-24-09 : was able to erase and reprogram.
- 1-24-09 : system is getting 3.3V w/push button - however, unable to program over protected segments
3
- 7-13-09 : changed R43 to 1.0meg
- 6-23-09 : seems to be working. appears to have been relabeled with #1 (despite the #3 appearing on two ICs.) removed label
- 1-24-09 : switching regulator gets voltage w/PB, however, 3.3V is unchanged.
todo
- replace switcher U7
IMU cables
- IMU cables with red wire are all subject to intermittent connections due to large wire size. use a small screw driver or xacto to press wires back into IDC slots.
pinout (new SC Rev200 -> IMU cable
- 12pin -> 10pin
- 1 -> 10
- 2 -> NC
- 3 -> 7
- 4 -> 6
- 5 -> 5
- 6 -> 4
- 7 -> 2
- 8 -> 9
- 9 -> 8
- 10 -> NC
- 11 -> 1
- 12 -> NC
pinout (old SC Rev100->IMU) cable
- 12pin -> 10pin
- 1 -> 1 (VBAT)
- 2 -> NC
- 3 -> 4 (SS)
- 4 -> 5 (SLK)
- 5 -> 6 (MOSI)
- 6 -> 7 (MISO)
- 7 -> 9 (SRVC)
- 8 -> 2 (DEBUG)
- 9 -> 3 (SCPWREN)
- 10 -> NC
- 11 -> 10 (GND)
- 12 -> NC