Measurement-computing USB-1616FS Manuel d'utilisateur télécharger pdf (Page 26)

USB-1616FS User's Guide Specifications

Counter

Table 10. Counter specifications

Pin name

CTR

Counter type

Event counter

Number of channels

Input type

TTL, rising edge triggered

Resolution

32 bits

Counter/timer read/write rates; software paced

Counter read: system dependent, 33 reads to 1000 reads per second

Counter clear: system dependent, 33 reads to 1000 writes per second

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

1.0 V min, -0.5 V max

Input high voltage

4.0 V min, 5.5 V max

Memory

Table 11. Memory specifications

Data FIFO

32,768 samples, 65,536 bytes

EEPROM

1,024 bytes

EEPROM configuration

Address range

Access

Description

0x000-0x07F

Reserved

128 bytes system data

0x080-0x1FF

Read/Write

384 bytes calibration data

0x200-0x3FF

Read/Write

512 bytes user area

Microcontroller

Table 12. Microcontroller specifications

Type

High performance 8-bit RISC microcontroller

Program memory

16,384 words

Data memory

2,048 bytes

Power

Table 13. Power specifications

Parameter

Conditions

Specification

Supply current

USB enumeration

<100 mA

Supply current (Note 5)

Continuous mode

350 mA typ

User +5V output voltage range (Note 6)

Available at the 5V screw terminal

4.0 V min, 5.25 V max

User +5V output current (Note 7)

Available at the 5V screw terminal

50 mA max

Note 5: The total current requirement for the USB-1616FS which includes up to 10mA for the status LEDs.

Note 6: Output voltage range assumes input power supply voltage is within specified limits

Note 7: The total amount of current that can be sourced from the 5V screw terminal for general use. This

specification includes any additional contribution due to DIO loading.

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