Difference between revisions of "USB"
From Gumstix User Wiki
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{| border="1" cellpadding="5" cellspacing="0" | {| border="1" cellpadding="5" cellspacing="0" | ||
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| − | | style="width:100px;background: | + | | style="width:100px;background:limegreen;" | USBH_PWR1 || colspan="2" | Pull-up to 3.3 volts to enable USB port |
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| − | | style="background: | + | | style="background:limegreen;" | USBH_PEN1 || colspan="2" | |
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| − | | style="background: | + | | style="background:limegreen;" | USBH_P1 || rowspan="4" align="center" | USB port || USB D+ |
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| − | | style="background: | + | | style="background:limegreen;" | USBH_N1 || USB D- |
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| style="background:tomato;" | V_BATT || USB VBUS | | style="background:tomato;" | V_BATT || USB VBUS | ||
Revision as of 10:02, 14 March 2008
| USBH_PWR1 | Pull-up to 3.3 volts to enable USB port | |
| USBH_PEN1 | ||
| USBH_P1 | USB port | USB D+ |
| USBH_N1 | USB D- | |
| V_BATT | USB VBUS | |
| GND | USB DGND | |
The 24-pin flex ribbon connector has USB port 1 on it. The pinouts you need are:
- V_BATT (pin 24) - USB power
- USBH_N1 (pin 18) - USB D-
- USBH_P1 (pin 17) - USB D+
- GND (pin 8) - USB Ground
In addition, you need to pull USBH_PWR1 (pin 20) up to 3.3 volts to enable the port. You need to provide a stable 3.3 volt supply, which is fairly simple to do by adding a small SOT23 package voltage regulator (like the LM3480), with the power input coming from V_BATT (pin 24) and the output going to USBH_PWR1 (pin 20).
