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Jira LegacyserverSystem JIRAcolumnskey,summary,type,created,updated,due,assignee,reporter,priority,status,resolutionserverId6df7ba0d-c6df-39f5-b19f-bb96d235af5fkeyhttps://uwmidsun.atlassian.net/browse/MH-152

J1772 Interface

  •  When board is powered, Regulator U3 should output 5V otherwise the PP and CP readings may be off.
  •  Y1 should output a 16MHz wave otherwise CAN may not work as expected.

In case documentation and instructions here are not clear enough, see this link: https://blog.digital-scurf.org/posts/evse-tester-prototype/ (unfinished but better than most stuff on the internet)Proximity Pilot (PP)

...

“Parallel resistance” refers to the resistors + switch on pin 5 on the connector side.

Expected readings:

EVSE_PROXIMITY Voltage Parallel Resistance (VOhms)

U4 Inverting Input Voltage (V)

PA7 Voltage (V)

Not Connected (infinite)

4.46

2.735

480

12.5377

1.530.938

2.771502

1.7753

10.938

  •  PA7 should always be DC. Time constant for RC filter (R8, C10) = 10us = 100kHz
  •  PA7 should never exceed 3.3V

...