Measurement Computing USB-1602HS-2AO - Manual (Page 43)

USB-1602HS-2AO User's Guide Specifications
43
Counters
Table 13. Counter specifications
Parameter Specification
Number of channels 4 independent CTRL 0,1,2,3 (may be configured as gated if desired)
Modes Counter, Period, Pulse width, Timing
Counter mode options Totalize, Clear on Read, Rollover, Stop at top, 16-bit or 32-bit, any other channel can
decrement the counter
Period mode options Measure x1, x10, x100, or x1000 periods, 16-bit or 32-bit, 4 time bases to choose from
(20.83 ns, 208.3 ns, 2.083 μs, 20.83 μs), any other channel can gate the period measurement
Pulse width mode options 16-bit or 32-bit values, 4 time bases to choose from (20.83 ns, 208.3 ns, 2.083 μs, 20.83 μs),
any other channel can gate the pulse width measurement
Timing mode options 16-bit or 32-bit values, 4 time bases to choose from (20.83 ns, 208.3 ns, 2.083 μs, 20.83 μs)
Resolution 16 or 32-bits
Maximum input frequency 20 MHz
Input type TTL, rising edge triggered
Absolute maximum input
voltage 15V
De-bounce function 16 selections, from 500ns to 25.5ms, pos or neg edge, glitch detect and/or de-bounce modes
Required input current ±5 µA
Minimum pulse width 25 nS high, 25 ns low
Input high voltage 2.0 V minimum, 5.5 V maximum
Input low voltage 0.8 V maximum, 0 V minimum
Timers
Table 14. Timer specifications
Parameter Conditions Specification
Number of channels Two: TMR/PWM0, TMR/PWM1
Effective frequency range 0.0112 Hz to 24 MHz
Period resolution 20.83 nS
Pulse width resolution 20.83 nS
Output high voltage
(IOH = –2.5 mA) 2.4 V minimum
Output low voltage (IOL = 2.5 mA) 0.4 V maximum
Output current 2.5 mA maximum per pin