2.13 Hardware Revision Notes
Starting September of 2006, all U3 shipments changed from hardware revision 1.20 to 1.21.
Following are the some of the main changes in revision 1.21:
• The default timer clock frequency is 48 MHz.
• All TimerBaseClock frequencies are twice the previous frequencies.
• The input timer edge limit is now 30,000 edges/second, compared to the old limit of
10,000 edges/second.
• Stream mode is now supported. See Section 3.2.
• Other new functions are supported, including Watchdog, SPI, Asynch, I2C, and SHT1X.
• Typical supply current is 50 mA.
Older U3s can be upgraded by LabJack for a small fee. For information about upgrading a rev
1.20 unit, go to labjack.com.
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