USB-CTR datasheet(2/8 Pages) ETC

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Measurement Computing

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USB-CTR Series

Features

Counter Input Modes

USB-CTR Series devices support the following counter input

modes:

• totalize mode (event counter)

• period measurement mode

• pulse-width measurement mode

• timing measurement mode

Counter input modes are software-selectable. Some modes

include the max limit and the min limit register values, which

do not directly affect the current count, but set limits in some

modes to determine counter behavior.

Each mode supports additional counter options.

Totalize Mode

In totalize mode, a USB-CTR Series device functions as a high

speed pulse event counter for general counting applications.

Each counter can be set to any resolution up to 64-bits based on

the software-selectable max limit and min limit register values.

The counters can accept frequency inputs up to 48 MHz.

The counter input connector (

CxIN) is used as the primary

counter input, and the counter gate connector (

CxGT) can be

used to perform one of the following functions:

• set the count direction

• gate the counter

• clear/reload the counter with the min limit value

• trigger a particular counter to begin counting.

The following totalize measurement mode options are software-

selectable:

Clear on Read: The counter is cleared after each read (synchro-

nous or asynchronous). The value of the counter before it was

cleared is latched and returned. It is typically cleared to zero,

but depending on counting mode, it may be cleared to the value

stored in the min limit register.

Range Limit: Set max limit and min limit register values to mimic

limit switches in a mechanical counter.

• When counting up, the counter freezes or rolls over to the

min limit count whenever the count reaches the max limit

• When counting down, the counter freezes or rolls over to

the max limit count whenever the count reaches the min

limit register value.

Counter Inputs 0-3

USB

Port

FPGA

Microcontroller

with

USB 2.0

High-Speed Interface

D+/D-

Clock

Output

8-Bit

Data

Bus

16-Bit

FIFO

Bus

Power Supplies

VBUS

(5 V)

Power Control

3.3 V Always On

Counter Outputs 0-3

Counter Gates 0-3

Trigger Input

Clock Output

External Clock Input

DIO 0-7

DIO

Protection

Counter Inputs 4-7

Counter Outputs 4-7

Counter Gates 4-7

Timer Outputs 0-3

+VO

3.3 V

5 V

1.2 V

USB-CTR08 only

USB-CTR Series Block Diagram

USB-CTR Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

USB-CTR Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers

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Datasheet Download

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