Measurement-computing USB-1608FS Uživatelský manuál stáhnout pdf (Strana 22)

USB-1608FS User's Guide

Counter

Table 8. Counter specifications

Parameter Specification

Pin name CTR

Counter type Event counter

Number of channels 1

Input type Schmitt trigger, 47 kΩ pull-down to ground

Input source CTR screw terminal

Resolution 32 bits

Schmitt trigger hysteresis 1.01 V typ

0.6 V min

1.5 V max

Input high voltage threshold 2.43 V typ

1.9 V min

3.1V max

Input high voltage limit 5.5 V absolute max

Input low voltage threshold 1.42 V typ

1.0 V min

2.0 V max

Input low voltage limit –0.5 V absolute min

0 V recommended min

Maximum input frequency 1 MHz

High pulse width 500 ns min

Low pulse width 500 ns min

Memory

Table 9. Memory specifications

Parameter Specification

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 cal data

0x200-0x3FF Read/write 512 bytes user area

Microcontroller

Table 10. Microcontroller specifications

Parameter Specification

Type High performance 32-bit RISC microcontroller

1 2 ... 17 18 19 20 21 22 23 24 25 26

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