Measurement-computing USB-7204 Instrukcja Użytkownika Pobierz pdf (Strona 25)

USB-7204 User's Guide Specifications

Counter

Table 14. Counter specifications

Parameter Specification

Pin name (Note 9) CTR

Counter type Event counter

Number of channels 1

Input type TTL, rising edge triggered

Input source CTR screw terminal

Resolution 32 bits

Schmidt trigger hysteresis 20 mV to 100 mV

Input leakage current ±1 µA

Input frequency 1 MHz max

High pulse width 500 ns min

Low pulse width 500 ns min

Input high voltage 4.0 V min, 5.5 V absolute max

Input low voltage 1.0 V max, –0.5 V absolute min

Note 9: CTR is a Schmitt trigger input protected with a 1.5K Ω series resistor.

Non-volatile memory

Table 15. Non-volatile memory specifications

Parameter Specification

EEPROM 1,024 bytes

EEPROM Configuration

Address Range Access Description

0x000-0x1FF Reserved 512 bytes system and cal data

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

Microcontroller

Table 16. Microcontroller specifications

Parameter Specification

Type High performance 8-bit RISC microcontroller

Program Memory 32,768 words

Data Memory 3,936 bytes

Indicator LEDs

Table 17. Indicator LED specifications

Parameter Specification

Power LED (top) Indicates that the device’s microcontroller has power and is configured.

Status LED Blinks to indicate USB communications.

OEM power OEM Connector; LED sink current up to 5 mA per LED @ 5 V

max

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