Measurement Specialties PMD-1024HLS Manual Do Utilizador
PMD-1024HLS User's Guide
Specifications
Counter section
Table 4-2. Counter specifications
Pin name (Note 4)
CTR
Counter type
Event counter
Number of channels
1
Input source
CTR screw terminal
Resolution 32
bits
Schmidt trigger hysteresis
20 mV to 100 mV
Input leakage current
±1 µA
Maximum input frequency
1 MHz
High pulse width
500 ns min
Low pulse width
500 ns min
Input low voltage
0 V min, 1.0 V max
Input high voltage
4.0 V min, 15.0 V max
Note 4:
CTR is a Schmitt trigger input
Power
Table 4-3. Power specifications
Parameter Conditions
Specification
Supply current (Note 5)
No Load
60 mA
Input power requirements
(Note 6)
(Note 6)
4.75 V min, 5.25 V max
USB +5 V power available
Measured at “USB +5 V” screw terminals
(pins 10,14 and 30)
(pins 10,14 and 30)
4.4 V min, 5.25 V max
Connected to:
Self-powered hub
Externally-powered root port hub
[350 mA] – [total output source
current]
current]
USB +5 V power output
current (Note 7)
current (Note 7)
Connected to
Bus-powered hub
Battery-powered root port hub.
[60 mA] – [total output source
current]
current]
Hold current: 350 mA, typical
Trip current: 700 mA typical
Trip/recovery time: 100 mS, max
USB +5 V overcurrent
protection
protection
Resettable fuse
On resistance: 1.3 Ohms max
Note 5:
Note 6:
Note 7:
This is the total (no load) current requirement for the PMD-1024HLS.
Bus-powered hubs are allowed to provide downstream USB power as low as 4.4 V.
Although your PMD-1024HLS will typically function at this 4.4 V minimum, guaranteed
performance requires a minimum power supply voltage of 4.75 V. All self-powered and
root port hubs will meet this 4.75 V minimum.
Although your PMD-1024HLS will typically function at this 4.4 V minimum, guaranteed
performance requires a minimum power supply voltage of 4.75 V. All self-powered and
root port hubs will meet this 4.75 V minimum.
See available source/sink current level in the "Digital input/output" section.
4-2