Revision as of 03:14, 10 July 2009

connections to SC

• depending on the specific PCA assembly, it is possible to use either one, or both the connections to the SC.
• if both connections are made, no significant ECOs are needed to the SC, and power for the SC side of the PCA is provided from the SC without local (PCA) support circuitry.

battery dataport connection (1st cable)

• requires a 5 position, 1.0mm cable, double ended. We can easily build this.
• to have the loadwasher signal get to the ADCs, no (significant) mods are required to the SC - the load-washer signal is read via the batt-temp input. R102 / C73 would be changed to adjust the cut-off frequency, which is normally 160hz.
  • change C73 from 0.1uF to 1nF

• if the 2nd cable is not attached, then ~24V is provided to the SC side of the PCA from this cable and requires the battery measurement ECO
  • several regulators need to be populated on the SC side of the PCA

linear spring connection (2nd cable)

• requires a 5 position, 0.8mm cable, double ended. (we should have some of these - 6" length)
• this connection uses the SC 3.0V ref to power the SC side of the PCA
• if not using battery dataport (1st) cable - significant SC ECOs are required to get the loadwasher signal to the ADCs:
  • remove R17
  • Remove R138
  • Change value of C95 from 0.1uF to 10nF
  • Jumper wire from TP72 to TP56
  • both the SC and the MC see the loadwasher signal

other connections

• DB15? cable is connected to the charge amplifier
• external 24V is required - this can be shared with other devices. it powers the charge amplifier and some PCA circuity.