Timer - Measurement Computing USB-1208HS-4AO User Manual

USB-1208HS-4AO User's Guide

Timer

Timer terminal name
Timer type
Output value
Internal clock frequency
Register widths
High pulse width
Low pulse width
Output high voltage
Output low voltage
Output current
Memory
Data FIFO
Non-volatile memory
Power
Parameter
Operating modes
Supply current (see Note 1)
Power consumption excluding
analog and digital outputs
Power available for +5 V, AICKO,
AOCKO, TMR, analog outputs,
digital I/O
Digital output power calculation
Analog output power calculation
+5 V output power calculation
+5 V output voltage range
(see Note 2)
+5 V output current
Fuses
This is the total current consumption for the USB-1208HS-4AO including +5 V, digital output and
Note 1:
analog output currents.
Table 10. Timer specifications
TMR
PWM output with count, period, delay, and pulse width registers
Default state is idle low with pulses high, software selectable output invert
40 MHz
32 bits
20 ns minimum
20 ns minimum
4.4 V minimum (IOH = -50 µA)
3.76 V minimum (IOH = -24 mA)
0.1 V maximum (IOL = 50 µA)
0.44 V maximum (IOL = 24 mA)
±24 mA maximum per pin (see "Power" section for additional information)
Table 11. Memory specifications
4 kS analog input/4 kS analog output
32 KB (16 KB firmware storage, 16 KB calibration/user data)
Table 12. Power specifications
Conditions Specification
Bus-powered, USB 5 V supply
Suspend mode <2.5 mA
Enumeration <100 mA
Run mode <500 mA
Run mode
1.175 W maximum (235 mA input current)
Run mode
1.325 W maximum
The total power consumption for all external loads must be
less than this value and each load must meet the individual
specification for the terminal.
Power per output = Iout * 5 V (for example, @ 24 mA, P =
0.024*5 = 120 mW/output)
Power per output = (Iout * 16.5 V)/0.78 (for example, @
3 mA, P = (0.003*16.5)/0.80 = 63.5 mW/output)
Power (W) = Iout * 5 V
Run mode
4.5 V minimum, 5.25 V maximum
Suspend mode,
0 V
enumeration
Run mode, no 265 mA maximum (1.325 W).
other output loads
On USB supply
0452.750 - Littelfuse 0.750A NANO2® Slo-Blo®
Subminiature Surface Mount Fuse.
Spare fuse mounted in holder on PCB.
23
Specifications