Mini Mainboard: Difference between revisions
(Added variant table/hardware detection) |
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!voltage | !voltage | ||
!ADC | !ADC | ||
!+/-5% range | |||
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| - | | - | ||
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|0.29 V | |0.29 V | ||
|357 | |357 | ||
|339-375 | |||
|- | |- | ||
| - | | - | ||
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|0.35 V | |0.35 V | ||
|431 | |431 | ||
|409-453 | |||
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| - | | - | ||
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|0.41 V | |0.41 V | ||
|504 | |504 | ||
|479-529 | |||
|- | |- | ||
|Nissan Leaf Gen3 | |Nissan Leaf Gen3 | ||
| Line 51: | Line 55: | ||
|0.48 V | |0.48 V | ||
|598 | |598 | ||
|568-628 | |||
|- | |- | ||
| - | | - | ||
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|0.52 V | |0.52 V | ||
|643 | |643 | ||
|611-675 | |||
|- | |- | ||
| - | | - | ||
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|0.56 V | |0.56 V | ||
|700 | |700 | ||
|665-735 | |||
|- | |- | ||
| - | | - | ||
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|0.67 V | |0.67 V | ||
|831 | |831 | ||
|789-873 | |||
|- | |- | ||
| - | | - | ||
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|0.73 V | |0.73 V | ||
|905 | |905 | ||
|860-950 | |||
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| - | | - | ||
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|0.79 V | |0.79 V | ||
|977 | |977 | ||
|928-1026 | |||
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|0.86 V | |0.86 V | ||
|1067 | |1067 | ||
|1014-1120 | |||
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|0.93 V | |0.93 V | ||
|1154 | |1154 | ||
|1096-1212 | |||
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[[Category:OpenInverter]] [[Category:Inverter]] | [[Category:OpenInverter]] [[Category:Inverter]] | ||
Revision as of 16:58, 6 October 2023
The mini mainboard is the smallest form factor openinverter motor control board. It has the same functionality as the Main Board Version 3 but offloads a few components. It is meant to be used as a daughter board on top of an adapter board. The adapter board must (or may) implement:
- The Wifi module socket
- Relay drivers
In addition the mini mainboard allows talking to SPI peripherals. Therefore some pins have double mapping:
- SIG_CRUISE: MOSI (SJ3 must be closed to the right side for that).
- OUT_BRAKE: MISO
- OUT_ERR: SCK
- OUT_OUVTG: /CS
Like previous boards it contains a 5V switching regulator that can be loaded with about 500 mA. Alternatively It can be powered with a single 5V rail, which has to sit at 5.3V though for sufficient resolver excitation amplitude.
As opposed to earlier mainboards the current sensor inputs are now designed for 5V input, i.e. 2.5V @ 0A. This interfaces directly with most current sensors that OEMs use and also with Melexis chips, LEM HTFS and Tamura L06P current sensors.
Hardware detection
Because the mini mainboard is primarily meant to be mounted on some sort of base board, we wanted to introduce a detection mechanism for the base board in case any special treatment is needed.
We chose to assign a secondary meaning to the OUT_BRAKE pin because its level can be measured by the ADC. So OUT_BRAKE can be brought to a certain voltage level with a high impedance voltage divider. The voltage level encodes the hardware variant. It will not disturb normal operation because its total resistance is chosen at least one order of magnitude larger than the output impedance of OUT_BRAKE, which is about 270 Ohms.
A the upper voltage divider resistor R1 is connected to the "5V" rail which actually sits at 5.3V. R2 is connected to GND
| Variant | R1 | R2 | voltage | ADC | +/-5% range |
|---|---|---|---|---|---|
| - | 47k | 2k7 | 0.29 V | 357 | 339-375 |
| - | 47k | 3k3 | 0.35 V | 431 | 409-453 |
| - | 47k | 3k9 | 0.41 V | 504 | 479-529 |
| Nissan Leaf Gen3 | 47k | 4k7 | 0.48 V | 598 | 568-628 |
| - | 47k | 5k1 | 0.52 V | 643 | 611-675 |
| - | 47k | 5k6 | 0.56 V | 700 | 665-735 |
| - | 47k | 6k8 | 0.67 V | 831 | 789-873 |
| - | 47k | 7k5 | 0.73 V | 905 | 860-950 |
| - | 47k | 8k2 | 0.79 V | 977 | 928-1026 |
| - | 47k | 9k1 | 0.86 V | 1067 | 1014-1120 |
| - | 47k | 10k | 0.93 V | 1154 | 1096-1212 |