USB-2416 User's Guide
Specifications
37
Note 5:
The external pull-up is connected to the digital output bit through an external pull-up resistor. Adding an
external pull-up resistor connects it in paral
lel with the internal 47k Ω pull
-up resistor of that particular digital
input/output bit. Careful consideration should be made when considering the external pull-up resistor value and
the resultant pull-up voltage produced at the load.
Note 6:
Does not include the additional leakage current contribution that may occur when using an external pull-up
resistor.
Counter
Table 23. CTR specifications
Parameter
Conditions
Specification
Pin name
CTR0, CTR1
Number of channels
2 channels
Resolution
32-bits
Counter type
Event counter
Input type
Schmitt trigger, rising edge triggered
Input source
CTR0 (pin 43)
CTR1 (pin 45)
Counter read/writes rates
(software paced)
Counter read
System dependent, 500 reads per second.
Counter write
System dependent, 500 reads per second.
Input characteristics
Each CTRx input pin
562
KΩ pull
-
up resistor to +5V, 10 kΩ series
resistor
Input voltage range
±15 V max
Maximum input voltage range
CTR0,CTR1 relative to GND and
DGND pins
±20 V max (power on/off)
Input high voltage
1.3 V min, 2.2 V max
Input low voltage
1.5 V max, 0.6 V min
Schmitt trigger hysteresis
0.4 V min, 1.2 V max
Input bandwidth (
-3
db)
1 MHz
Input capacitance
25 pf
Input leakage current
±120 nA
Input frequency
1 MHz max
High pulse width
500 ns, min
Low pulse width
500 ns, min
Note 7:
The DGND and GND pins are common and isolated from earth ground.
Memory
Table 24. Memory specifications
EEPROM
4096 bytes isolated micro reserved for sensor configuration
256 bytes USB micro for external application use
Microcontroller
Table 25. Microcontroller specifications
Type
One high-performance 8-bit RISC microcontroller with USB interface (non-isolated)
One high-performance 16-bit RISC microcontroller for measurements (isolated)
