Measurement-computing USB-1208FS Manual de usuario descargar pdf (Pagina 24)

USB-1208FS User's Guide Specifications

Counter

Table 14. 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, rising edge triggered

Input source CTR screw terminal

Resolution 32 bits

Maximum input frequency 1 MHz

High pulse width 500 ns min

Low pulse width 500 ns min

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

Non-volatile memory

Table 15. Non-volatile memory specifications

EEPROM 1,024 bytes

EEPROM Configuration

Address Range Access Description

0x000 to 0x07F Reserved 128 bytes system data

0x080 to 0x1FF Read/write 384 bytes cal data

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

Microcontroller

Table 16. Microcontroller specifications

Parameter Specification

Type

High performance 16-bit RISC microcontroller

1 2 ... 19 20 21 22 23 24 25 26 27 28 29

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