Difference between revisions of "USB"

From Gumstix User Wiki
Jump to: navigation, search
Line 13: Line 13:
 
| style="background:grey;" | GND || USB DGND
 
| style="background:grey;" | GND || USB DGND
 
|}
 
|}
 +
  
  
 
The [[24pin_connector|24-pin flex ribbon]] connector has USB port 1 on it.  
 
The [[24pin_connector|24-pin flex ribbon]] connector has USB port 1 on it.  
 
The pinouts you need are:
 
The pinouts you need are:
 +
  
 
* V_BATT (pin 24) - USB power
 
* V_BATT (pin 24) - USB power
Line 22: Line 24:
 
* USBH_P1 (pin 17) - USB D+
 
* USBH_P1 (pin 17) - USB D+
 
* GND (pin 8) - USB Ground
 
* 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 [http://www.national.com/mpf/LM/LM3480.html LM3480]), with the power input coming from V_BATT (pin 24) and the output going to USBH_PWR1 (pin 20).
 
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 [http://www.national.com/mpf/LM/LM3480.html LM3480]), with the power input coming from V_BATT (pin 24) and the output going to USBH_PWR1 (pin 20).

Revision as of 10:55, 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).