Measurement Computing USB-231 - Manual (Page 25)

USB-231 User's Guide Specifications
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Memory
Table 8 Memory specifications
Parameter Specification
Data FIFO 2,047 samples (4096 bytes)
Non-volatile memory  Up to 256 kB microcontroller integrated Flash
 2 kB microcontroller integrated EEPROM)
Power requirements
Table 9. Power specifications
Parameter Specification
From USB 4.50 to 5.25 VDC (Note 2)
Idle USB current 165 mA
Maximum load USB current <500 mA (Note 3)
Note 2: A typical bus-powered hub provides 100 mA on its USB lines. The USB-231 does not work on a bus-
powered hub.
Note 3: The maximum power draw from all output terminals should be kept under 0.9 W to avoid overloading
the USB port
Power output
Table 10. External voltage specifications
Parameter Specification
Output voltage 5 V, ±3%
Maximum current 150 mA
Overcurrent protection 200 mA
Short circuit current 50 mA
Overvoltage protection ±20 V
USB specifications
Table 11. USB specifications
Parameter Specification
Device type USB 2.0 full speed (12 Mb/s)
Device compatibility USB 1.1, USB 2.0
Connector type USB micro-B receptacle
USB cable type A-micro-B cable, UL type AWM 2725 or equivalent (28 AWG × 2C + 28 AWG × 2C +
AB)
USB cable length 3 m (9.84 ft) max