Power; Usb Specifications; Current Excitation Outputs (Ix+) - Measurement Computing USB-TEMP User Manual

USB-TEMP User's Guide

Power

Parameter
Supply current
Supply current
(Note 16)
User +5V output voltage range
(terminal block pin 21 and pin 47)
User +5V output current
(terminal block pin 21 and pin 47)
Isolation
This is the total current requirement for the USB-TEMP which includes up to 10 mA for
Note 16:
the status LED.
Self-Powered Hub refers to a USB hub with an external power supply. Self-powered hubs
Note 17:
allow a connected USB device to draw up to 500 mA.
Root Port Hubs reside in the PC's USB Host Controller. The USB port(s) on your PC are
root port hubs. All externally powered root port hubs (desktop PC's) provide up to
500 mA of current for a USB device. Battery-powered root port hubs provide 100 mA or
500 mA, depending upon the manufacturer. A laptop PC that is not connected to an
external power adapter is an example of a battery-powered root port hub.

USB specifications

USB device type
Device
compatibility
USB cable type
USB cable length

Current excitation outputs (Ix+)

Parameter
Configuration
Current excitation output ranges
Tolerance
Drift
Line regulation
Load regulation
Output compliance voltage (relative to GND pins 9,19,28,38)
Table 5-14. Power specifications
Conditions
USB enumeration
Continuous mode
Connected to self-powered hub. (Note 17)
Bus-powered and connected to a self-powered hub.
(Note 17)
Measurement system to PC
Table 5-15. USB specifications
USB 2.0 (full-speed)
USB 1.1, USB 2.0
Self-powered, 100 mA consumption max
A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND, min 28 AWG
D+/D-)
3 meters max.
Table 5-16. Current excitation output specifications
5-7
Specifications
Specification
<100 mA
70 mA max.
4.75 V min. to
5.25 V max.
10 mA max.
500 VDC min.
Conditions Specification
4 dedicated pairs:
±I1 - CH0/CH1
±I2 - CH2/CH3
±I3 - CH4/CH5
±I4 - CH6/CH7
Thermistor 10 µA typ.
RTD 210 µA typ.
±5% typ.
200 ppm/°C
2.1 ppm/V max.
0.3 ppm/V typ.
3.90 V max.
-0.03 V min.