Measurement Computing USB-ERB08 - Manual (Page 20)

USB-ERB08 User's Guide Specifications
External power input
Table 3. External power input specifications
Parameter Conditions Specification
External power input +6.0 VDC to 12.5 VDC (9 VDC
power supply included)
6.0 V > Vext or Vext > 12.5 V PWR LED = Off (power fault) Voltage supervisor limits - PWR LED
(Note 1)
6.0 V < Vext < 12.5 V PWR LED = On
External power adapter (included) MCC p/n CB-PWR-9 +9 V ±10%, @ 1 A
Note 1: The USB-ERB08 monitors the external +9 V power supply voltage with a voltage supervisory
circuit. If this power supply exceeds its specified limit, the PWR LED will turn off indicating a
power fault condition.
External power output
Table 4. External power output specifications
Parameter Conditions Specification
External power output - current range 4.0 A max.
External power output (Note 2) Voltage drop between power input and daisy
chain power output 0.5 V max
Compatible cable(s) for daisy chain C-MAPWR-x x = 2 , 3, or 6 feet
Note 2: The daisy chain power output option allows multiple Measurement Computing USB boards to be
powered from a single external power source in a daisy chain fashion. The voltage drop between
the module power supply input and the daisy chain output is 0.5 V max. Users must plan for this
drop to ensure the last module in the chain will receive at least 6.0 VDC.
USB specifications
Table 5. USB specifications
USB "B" connector Input
USB device type USB 2.0 (full-speed)
Device compatibility USB 1.1, USB 2.0
USB "A" connector Downstream hub output port
Supports USB 2.0 high-speed, full-speed and low-speed operating points
USB hub type
Self-powered, 100 mA max downstream VBUS capability
Compatible products MCC USB Series devices
USB cable type (upstream and downstream) A-B cable, UL type AWM 2527 or equivalent.
(min 24 AWG VBUS/GND, min 28 AWG D+/D-)
USB cable length 3 meters max.
Relay contact pull-up/down option
Table 6. Relay pull-up/pull-down specifications
R1, R3, R5, R7, R10, R12, R14, R16 Relays NO contact pull-up (to USB +5V) / pull-down
R2, R4, R6, R8, R9, R11, R13, R15 Relays NC contact pull-up (to USB +5V) / pull-down
4-2