Measurement Computing USB-231-OEM, User Manual, Page: 23 / 26

USB-231-OEM User's Guide Specifications
23
LED electrical characteristics
Table 8.
LED electrical specifications
Parameter Condition Specification
Output Low Voltage
I
OL
= 8 mA 0.4 V max
I
OL
= 18 mA 1.2 V typ
External pull-up voltage 5.25 V max
Maximum sinking current 18 mA max
Memory
Table 9 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 10. 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-OEM 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 11. 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 12. 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