Difference between revisions of "Rev200 mods"
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=PCB needed Revisions= | =PCB needed Revisions= | ||
+ | ==discussion== | ||
+ | |||
+ | * overall our goal is it keep to a minimum the number of changes. The changes they we have proposed are absolutely necessary from our point of view. | ||
+ | |||
+ | * changing 0.8mm headers to 1mm | ||
+ | ** Obviously we would like to avoid this. In particular have had cables made for the EC30-MILE and IMU. However, with the other connectors I don't see a problem with this. | ||
+ | |||
+ | *4 Channel DAC | ||
+ | ** Have not made us of the DAC, however that very well could change as we will soon be doing automated testing. Unless there is a very compelling reason to remove it - I suggest that it remain. | ||
+ | |||
+ | *Primary Li cells | ||
+ | ** Again, unless there is a compelling reason, I believe it should remain. My understanding is that the foot print of the 2ndary and primary cells overlapped. Although I guess there is a possible problem with through hole mounting? | ||
+ | |||
+ | * The present design with the current sensors can actually cause an over-voltage condition on the dsPIC. When this happens there are offset and cross coupling issues on all channels. The slight lose in resolution is minor compared with the upside. | ||
+ | |||
+ | * Hall sensor should remain. The location of the sensor may change slightly. | ||
+ | ** The purpose of the connection to TP252 is so that we may experiment with alternative sensors. At present we don't have any. | ||
+ | |||
+ | |||
+ | |||
==FET== | ==FET== | ||
− | * w/clamp circuit - use thermal vias for R4 - this device is impossible to replace | + | * (1) w/clamp circuit - use thermal vias for R4 - this device is impossible to replace |
** will try low temp solder and send to MPD | ** will try low temp solder and send to MPD | ||
− | * height of coin cells is too great. need the original coin cell | + | * (2) height of coin cells is too great. need the cells from this original coin cell specification |
− | * pg 4/8 : populate coin cell charger as default | + | * (3) pg 4/8 : populate coin cell charger as default |
** populate BT2,BT3 as default, DNP BT1,BT4 (but keep R18, D21) | ** populate BT2,BT3 as default, DNP BT1,BT4 (but keep R18, D21) | ||
** DNP D13 only if primary coins are installed. | ** DNP D13 only if primary coins are installed. | ||
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*** expect a 150-200mV drop across D13 | *** expect a 150-200mV drop across D13 | ||
− | * change D13 (and D21 ?) to diode that actually has 200mV drop @ 1uA. BAS116-F-7 appears to have 427mV @ 0.3uA | + | *(4) change D13 (and D21 ?) to diode that actually has 200mV drop @ 1uA. BAS116-F-7 appears to have 427mV @ 0.3uA |
** See : [http://www.diodes.com/datasheets/ds30233.pdf (PDF)] - Diodes Inc BAS116-7-F fig 3, pg 2] | ** See : [http://www.diodes.com/datasheets/ds30233.pdf (PDF)] - Diodes Inc BAS116-7-F fig 3, pg 2] | ||
− | * pg 4/8 : ability 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 | + | *(5) pg 4/8 : ability 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 |
==SCMC== | ==SCMC== | ||
− | * pg 7/18 : change cutoff freq to ~15Khz for temp circuit (U22) R102=1k, C73=0.01u | + | *(6) pg 7/18 : 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 | + | *(7) pg 7/18 : remove R232 - 10k for batt_temp_mon pullup |
− | * pg 7/18 : remove R245 - 220 ohm for mtr_temp_mon pullup | + | *(8) 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) | + | *(10) pg 7/18 : R206, R216 -> 6.66k to scale range 0-5V to 0-3.0V (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 | ** 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 | ||
− | * pg 7/18 : bridge current sensor use same values phase U,V | + | *(11) 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. | + | *(12) 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. | + | *(13) pg 8/18 : 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 | + | *(14) pg 3/18 : replace 1.25mm header for EC30 enc/hall w/ 12x0.8mm header |
** [[http://mediawiki.dideas.com/index.php?title=Upd_2x0_218_controller#pinout 12x8 pinout]] | ** [[http://mediawiki.dideas.com/index.php?title=Upd_2x0_218_controller#pinout 12x8 pinout]] | ||
** [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] | ||
− | * pg 6/18 : replace HALL_C input with SSI_CLK 5V output | + | *(15) pg 6/18 : replace HALL_C input with SSI_CLK 5V output |
− | * pg 11/18 : (CB) need to determine the accuracy of the RTC. Seems to be drifting. | + | *(16) pg 11/18 : (CB) need to determine the accuracy of the RTC. Seems to be drifting. |
− | * pg 18/18 : Remove LSSGA before TP56 | + | *(17) pg 18/18 : Remove LSSGA before TP56 |
− | * Connect TP56 to LSSGA connector. needs to protect dsPIC, but no other circuity. | + | *(18) Connect TP56 to LSSGA connector. needs to protect dsPIC, but no other circuity. |
** adjust C95 for 15khz cutoff freq | ** adjust C95 for 15khz cutoff freq | ||
− | * pg 14/18 : Connect TP252 to LSSGA connector. Needs to protect dsPIC, but no other circuity. | + | *(19) pg 14/18 : Connect TP252 to LSSGA connector. Needs to protect dsPIC, but no other circuity. |
− | * 3/18 : LSSGA connector signals: | + | *(20) 3/18 : LSSGA connector signals: |
** AGND | ** AGND | ||
− | ** A3V ref | + | ** A3V ref (analog 3.0V reference) |
− | ** A 3V supply | + | ** A 3V supply ???? |
+ | *** Think I mean a 3.3V supply that can supply working current. The reference can't (shouldn't) supply power for components. | ||
** TP56 analog in | ** TP56 analog in | ||
** TP252 analog in | ** TP252 analog in |
Revision as of 21:55, 4 October 2009
- PF Top Nav; PCB; Hardware; Assembly PFCmdMenu iochan
- PCA : SC/MC 218 FET 217 IMU219 Swiffy Rev200_mods
- PFCMD : SC; MC; PFCMD_PY; Pf_calb_table_py; Virtual spring test; PF1_Code_History; PF EEPROM
- SERIES: S01 S02 S03 wow_left wow_right
PCB needed Revisions
discussion
- overall our goal is it keep to a minimum the number of changes. The changes they we have proposed are absolutely necessary from our point of view.
- changing 0.8mm headers to 1mm
- Obviously we would like to avoid this. In particular have had cables made for the EC30-MILE and IMU. However, with the other connectors I don't see a problem with this.
- 4 Channel DAC
- Have not made us of the DAC, however that very well could change as we will soon be doing automated testing. Unless there is a very compelling reason to remove it - I suggest that it remain.
- Primary Li cells
- Again, unless there is a compelling reason, I believe it should remain. My understanding is that the foot print of the 2ndary and primary cells overlapped. Although I guess there is a possible problem with through hole mounting?
- The present design with the current sensors can actually cause an over-voltage condition on the dsPIC. When this happens there are offset and cross coupling issues on all channels. The slight lose in resolution is minor compared with the upside.
- Hall sensor should remain. The location of the sensor may change slightly.
- The purpose of the connection to TP252 is so that we may experiment with alternative sensors. At present we don't have any.
FET
- (1) w/clamp circuit - use thermal vias for R4 - this device is impossible to replace
- will try low temp solder and send to MPD
- (2) height of coin cells is too great. need the cells from this original coin cell specification
- (3) pg 4/8 : populate coin cell charger as default
- populate BT2,BT3 as default, DNP BT1,BT4 (but keep R18, D21)
- DNP D13 only if primary coins are installed.
- Would like the coin cells to have 6.0 to 6.1V to be fully changed. ABS maximum is 6.2V
- It doesn't appear to be possible to obtain this tight voltage specification with 1% resistors and the (PDF) MIC5235 LDO. The LDO has up to 2% variation in its output over temperate. Thus a total variation of upto +- 3.65% could be expected.
- 6.2 +- 3.65% = 5.98V to 6.42V
- expect a 150-200mV drop across D13
- (4) change D13 (and D21 ?) to diode that actually has 200mV drop @ 1uA. BAS116-F-7 appears to have 427mV @ 0.3uA
- See : (PDF) - Diodes Inc BAS116-7-F fig 3, pg 2]
- (5) pg 4/8 : ability 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
SCMC
- (6) pg 7/18 : change cutoff freq to ~15Khz for temp circuit (U22) R102=1k, C73=0.01u
- (7) pg 7/18 : remove R232 - 10k for batt_temp_mon pullup
- (8) pg 7/18 : remove R245 - 220 ohm for mtr_temp_mon pullup
- (10) pg 7/18 : R206, R216 -> 6.66k to scale range 0-5V to 0-3.0V (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
- (11) pg 7/18 : bridge current sensor use same values phase U,V
- (12) Pg 8/18 : increase size of resisters (by 10x) for supply voltage measurement (R91, R94, R221, R88). Keep cut off freq the same.
- (13) pg 8/18 : populate so measurement of supply voltage is default (R222, R233 installed). its easier to remove components than to add them.
- (14) pg 3/18 : replace 1.25mm header for EC30 enc/hall w/ 12x0.8mm header
- (15) pg 6/18 : replace HALL_C input with SSI_CLK 5V output
- (16) pg 11/18 : (CB) need to determine the accuracy of the RTC. Seems to be drifting.
- (17) pg 18/18 : Remove LSSGA before TP56
- (18) Connect TP56 to LSSGA connector. needs to protect dsPIC, but no other circuity.
- adjust C95 for 15khz cutoff freq
- (19) pg 14/18 : Connect TP252 to LSSGA connector. Needs to protect dsPIC, but no other circuity.
- (20) 3/18 : LSSGA connector signals:
- AGND
- A3V ref (analog 3.0V reference)
- A 3V supply ????
- Think I mean a 3.3V supply that can supply working current. The reference can't (shouldn't) supply power for components.
- TP56 analog in
- TP252 analog in
- locate IMU header for easier access. possibly rot180 - or move 2mm away from edge.
- KS - lower position for V2.
- CB - in V2 appears to be much more space in the shell, no other changes may be needed.
IMU
- probably want to upgrade dual axis IMU
- battery measurement circuit needs to be re-done.