Charger Interface Test Plan
- Nita E
Owned by Nita E
https://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.
Proximity Pilot (PP)
“Parallel resistance” refers to the resistors + switch on pin 5 on the connector side.
Expected readings:
EVSE_PROXIMITY Parallel Resistance (Ohms) | U4 Inverting Input Voltage (V) | PA7 Voltage (V) |
|---|---|---|
Not Connected (infinite) | 4.46 | 2.735 |
480 | 2.77 | 1.938 |
150 | 1.53 | 0.938 |
PA7 should always be DC. Time constant for RC filter (R8, C10) = 10us = 100kHz
PA7 should never exceed 3.3V
Control Pilot (CP)
Status | EVSE_CONTROL_PILOT Voltage (V) | PA6_AN6_CONTROL_PILOT_PWM Voltage (V) | PA5_AN5_CONTROL_PILOT_SENSE Voltage (V) |
|---|---|---|---|
A (standby) | 0 | 0 | 0 |
B (vehicle detected) | +9/-12V square wave 1kHz | +2.87/0V square wave 1kHz | 2.87 * duty cycle |
C (ready) PA2_CONTROL_PILOT_SELECT must be ON to enter this state | +6/-12V square wave 1kHz | +1.27/0V square wave 1kHz | 1.27 * duty cycle |
PA5 should always be DC. Time constant for RC filter (C17, R20) t = 0.1s = 10Hz
Neither PA6 or PA5 should exceed 3.3V
Duty cycle depends on maximum current allowed for charging
Relay Controls
Both PB7 and PB9 should be enabled before any power is detected on 12V_CONTACTOR_COIL_SW (cathode of D9).
When both are enabled, 12V_CONTACTOR_COIL_SW should be at 12V.
When both are enabled, initial current should be approx 30A and LED3 should turn on. It should be enough to close the relay.
The relay should open if PB7 or PB9 (or both) are off.