Measurement-computing PC-CARD-DAS16/330 Manual de usuario descargar pdf (Pagina 22)

PC-CARD-DAS16/330 User's Guide Specifications

Interrupt

Table 7. Interrupt specifications

Interrupts Programmable: levels 2 – 15

Interrupt enable Programmable (default = disabled)

External (External Interrupt)

A/D End-of-channel-scan

A/D FIFO-not-empty

A/D FIFO-half-full

Interrupt sources

A/D Pacer

Counter

Table 8. Counter specifications

Counter type 82C54

Configuration 3 down counters, 16 bits each

Source: Programmable external (Ctr 1 Clk) or 100kHz internal source

Gate: Available at connector (Ctr 1 Gate), pulled to logic high via 10k

resistor (See Note 2).

Counter 1 - User counter

Output: Available at connector (Ctr 1 Out)

Source: Programmable, 1 MHz or 10 MHz internal source

Gate: Available at connector (A/D Pacer Gate), pulled to logic high via

10 k resistor.

Counter 2 - ADC Pacer Lower

Divider

Output: Chained to Counter 3 Clock

Source: Counter 2 Output

Gate: Internal

Counter 3 - ADC Pacer Upper

Divider

Output: Programmable as ADC Pacer clock. Available at user connector

(ADC Pacer out)

Clock input frequency 10 MHz max

High pulse width (clock input) 30 ns min

Low pulse width (clock input) 50 ns min

Gate width high 50 ns min

Gate width low 50 ns min

Input low voltage 0.8 V max

Input high voltage 2.0 V min

Output low voltage 0.4 V max

Output high voltage 3.0 V min

Crystal oscillator frequency 10 MHz

Frequency accuracy 50 ppm

Note 2: If you are not driving the gate of User Counter 1, it is strongly recommended that it be connected

to +5V (VDD).

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