Difference between revisions of "USB"
|Line 41:||Line 41:|
Revision as of 12:58, 4 April 2008
|USBH_PWR1||Pull-up to 3.3 volts to enable USB port|
|USBH_P1||USB port||USB D+|
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).
WARNING: This information could be yet inaccurate. TODO: D+/D- pull-down resistors (software?), termination resistors and capacitors for EMI suppresion, plus USBH_PEN1 and USBH_PWR1
(read warning above)