Difference between revisions of "Rev200 mods"

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m (→‎FET)
m (→‎PCB needed Revisions)
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* change D13 to diode that actually has 200mV drop @ 1uA.  BAS116-F-7 appears to have 427mV @ 0.3uA
 
* change D13 to diode that actually has 200mV drop @ 1uA.  BAS116-F-7 appears to have 427mV @ 0.3uA
 
**  
 
**  
−
* increase size of resisters for supply voltage measurement (R241)
+
 
  
 
==SCMC==
 
==SCMC==
 
* change cutoff freq to ~15Khz for temp circuit (U22) R102=1k, C73=0.01u  
 
* change cutoff freq to ~15Khz for temp circuit (U22) R102=1k, C73=0.01u  
  
 +
* pg 7/18 : remove R232 - 10k for batt_temp_mon pullup
 +
* pg 7/18 : remove R245 - 220 ohm for mtr_temp_mon pullup
 +
 +
* pg 7/18 : R206, R216 -> 6.66k to scale range 0-5V to 0-3.0V  (current sensors)
 +
* pg 7/18 : bridge current sensor use same values phase U,V
 +
 +
 +
* Pg 8/18 : increase size of resisters (by 10x) for supply voltage measurement (R91, R94, R221, R88).  Keep cut off freq the same. 
 +
 +
* pg 8/18 : populate so measurement of supply voltage is default (R222, R233 installed).  its easier to remove components than to add them.
  
 +
* pg 14/18 : Add DNP 1k? to the TP252 node that connects to the new previous linear spring connector
  
−
* populate so measurement of supply voltage is default (R222, R233 installed).  its easier to remove components than to add them.
+
* pg 3/18 : replace 1.25mm header for EC30 enc/hall w/ 12x0.8mm header
−
* locate IMU header for easy access.  possibly rot180 - or move 2mm away from edge.
+
** [[http://mediawiki.dideas.com/index.php?title=Upd_2x0_218_controller#pinout 12x8 pinout]]
−
* remove 1.25mm headers for EC30 encoder/hall sensor, replace with single 12x0.8mm header. Make a 5V clock output from one of the HALL C PIO.  [http://dhcp-17-197.media.mit.edu/ankle/for_mpd/prelim-EMILE3_070709.pdf  interface cable]
+
** [http://dhcp-17-197.media.mit.edu/ankle/for_mpd/prelim-EMILE3_070709.pdf  interface cable]
 +
* replace hall_c input with SSI_CLK 5V output
  
 
* need to determine the accuracy of the RTC.  Seems to be drifting.
 
* need to determine the accuracy of the RTC.  Seems to be drifting.
−
* R206, R216 -> 6.66k to scale range 0-5V to 0-3.0V  (current sensors)
 
−
* bridge current sense duplicate phase U,V sense
 
  
 
* need to workout : linear spring input to be used for some other 0-3V analog signal inputs.  Would like AGND, Analog 3V reference, Analog 5V, and a pair of analog inputs.   
 
* need to workout : linear spring input to be used for some other 0-3V analog signal inputs.  Would like AGND, Analog 3V reference, Analog 5V, and a pair of analog inputs.   
 
** Battery temp, and previous linear spring.
 
** Battery temp, and previous linear spring.
 
** Add zero ohm, DNP at TP252 and route to linear spring input
 
** Add zero ohm, DNP at TP252 and route to linear spring input
 +
 +
* locate IMU header for easy access.  possibly rot180 - or move 2mm away from edge.
 +
** KS - lower position. CB in V2 appears to be much more space in the shell
  
 
==IMU==
 
==IMU==
 
* probably want to upgrade dual axis IMU  
 
* probably want to upgrade dual axis IMU  
 
* battery measurement circuit needs to be re-done.
 
* battery measurement circuit needs to be re-done.

Revision as of 21:32, 30 September 2009


PCB needed Revisions

  • debug documentation should should show all TP pads, and not be the mirror image.
  • KS - need to adjust PCB outlines
  • height of coin cells is too great. need the original coin cell spec

current sensors

  • presently 5V current sensor becomes 3.283V, but ADC reference is 3.0V so of the 75.76A range (0->5V), only 69.23A are viable. Thus range is -37.88A to +31.34A. The scale factor is 65536 / (5/.066 * 3/(5*10/15.23)) = 946.6789

FET

  • w/clamp circuit - use thermal vias for R4 - this device is impossible to replace
    • will try low temp solder and send to MPD


  • populate coin charger as default with 6.3V target voltage (R=1.21meg). If non-rechargeable cells are installed, DNP the connecting resistor. (pg 4/8)
  • way to measure coin cell voltage without charger enabled? Connect pin 3 of U10 to something like the SFTYSNS_EN, or MTR_EN signal at TP97 or U20B
  • change D13 to diode that actually has 200mV drop @ 1uA. BAS116-F-7 appears to have 427mV @ 0.3uA


SCMC

  • change cutoff freq to ~15Khz for temp circuit (U22) R102=1k, C73=0.01u
  • pg 7/18 : remove R232 - 10k for batt_temp_mon pullup
  • pg 7/18 : remove R245 - 220 ohm for mtr_temp_mon pullup
  • pg 7/18 : R206, R216 -> 6.66k to scale range 0-5V to 0-3.0V (current sensors)
  • pg 7/18 : bridge current sensor use same values phase U,V


  • Pg 8/18 : increase size of resisters (by 10x) for supply voltage measurement (R91, R94, R221, R88). Keep cut off freq the same.
  • pg 8/18 : populate so measurement of supply voltage is default (R222, R233 installed). its easier to remove components than to add them.
  • pg 14/18 : Add DNP 1k? to the TP252 node that connects to the new previous linear spring connector
  • pg 3/18 : replace 1.25mm header for EC30 enc/hall w/ 12x0.8mm header
  • replace hall_c input with SSI_CLK 5V output
  • need to determine the accuracy of the RTC. Seems to be drifting.
  • need to workout : linear spring input to be used for some other 0-3V analog signal inputs. Would like AGND, Analog 3V reference, Analog 5V, and a pair of analog inputs.
    • Battery temp, and previous linear spring.
    • Add zero ohm, DNP at TP252 and route to linear spring input
  • locate IMU header for easy access. possibly rot180 - or move 2mm away from edge.
    • KS - lower position. CB in V2 appears to be much more space in the shell

IMU

  • probably want to upgrade dual axis IMU
  • battery measurement circuit needs to be re-done.
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