XO1.75 A3 Tinderbox
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This page is monitored by the OLPC team.
This page describes the Tinderbox Power setup for the XO-1.75 A3 prototype.
Readings
It must be emphasized that these power measurements are a starting point! They will be improved (hopefully by leaps and bounds !) They are already a good improvement, in terms of power supply efficiency, over the A1/A2 numbers.
Example readings from the XO-1.75 A3 Tinderbox include:
- Linux when Idle
- Linux writing to the SD
- Linux w. USB key inserted
- Linux reading from a USB key
- 2.5W drawn from USB
- Others are at http://dev.laptop.org/~wad/xo1.75_a3/
Channels
These are the channels wired up to the Aligent 34980A voltmeter.
| Channel | Name | Connection | Resistance |
|---|---|---|---|
| 1 | DC In | PF1 | 0.056 |
| 2 | Vin | PJP16 | 0.010 |
| 3 | Vcore in | PJP12 | 0.050 |
| 4 | Vcore out | PJP8 | 0.010 |
| 5 | +3.3VSUS in | PJP15 | 0.100 |
| 6 | +3.3VSUS out | PJP10 | 0.025 |
| 7 | +3.3V EC | R262 | 0.100 |
| 8 | +1.5V in | PJP2 | 0.047 |
| 9 | +1.5V out | PJP3 | 0.025 |
| 10 | Vterm | PJP4 | 0.047 |
| 11 | +1.8V in | PJP14 | 0.100 |
| 12 | +1.8V out | PJP11 | 0.033 |
| 13 | DC In | PF1 | Voltage |
| 14 | Vin | PJP6 | Voltage |
| 15 | Vcore | PJP8 | Voltage |
| 16 | +3.3V in | PJP7 | 0.100 |
| 17 | +3.3V out | PJP9 | 0.033 |
| 18 | +5V in | PJP6 | 0.100 |
| 19 | +5V out | PJP5 | 0.033 |
| 20 | +5V USB | U9.7,8 | 0.050 |
| 21 | BL in | PR16 | 0.050 |
| 22 | LCD Analog in | PL2 | 0.100 |
| 23 | +1.8V LCD | PQ22.1 | 0.100 |
| 24 | +1.8V DCON | PQ21.1 | 0.100 |
| 25 | +3.3V DCON | SP1 | 0.100 |
| 26 | +1.2V out | PJP13 | 0.100 |
| 27 | +1.5V SOC | R64 | 0.033 |
They are described to the tinderbox power measurement software by the cl2_a3.csv file.