Notes: P/S Design Review
   HRH 26 Oct 2020  10:00 - 12:00

Signal B_12V_ISO_BATT needs to be switched w/ latching relay
   It could be on the same relay as the Apollo
   other set of contacts

Benthos Acoustic Modem needs to be added
   Look at the current power board for architecture
   ( also see page 8 )

Sheet 4: 

  replace U136 HiSideSw w a latching relay
  or a P-FET or an OptoCoupler w/ enough output current

Sheet 6: 

  put Benthos Acoustic Modem ACM+ and ACM- on a separate connector

Sheet 7: 

  Reed switch goes away

  Add a scaled digital input from J32 pin 2/3 to XLP that tells XLP the state of the pressure switch

Sheet 8: 

  Remove the one-shots

  Drive the FETs directly from GPIO

  Use K3 to turn on/off pwr to the Benthos Acoustic Modem

  Wire U124 output directly to J27 Avtrak 6

Sheet 9: 

  Eliminate U3

  U2 is not beefy enough; need 12-15 Amps

  ( ISO rating is higher that we want to run the switch )

  Use a single switch, not two in parallel

  Worse case: just a fuse, or a relay

  Possibilities:  

    VN5016

    BTS6133

    VN920

    BTS441 ( HRH suggestion )

Sheet 12:

  J30 B_RDF_STBY_BATT_6V needs to be wired in parallel

  Identify what each battery pack us used for