Revision as of 01:16, 14 July 2009

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• PCA : SC/MC 218 FET 217 IMU219 Swiffy Rev200_mods
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PFMENU DOCS Aiw_hardware iochan AIW_assembly

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 : change 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 : change 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