XO1.75 A3 Tinderbox

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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	+2.5V out	PJP1	0.100
28	+3.3V USB	PQ24.1	0.100
29	+3.3V WLAN	Q15.3	0.100
30	+1.8V WLAN	Q11.1	0.100
31			0.100
32			0.100
33			0.100

They are described to the tinderbox power measurement software by the cl2_a3.csv file.