Measurement-computing WEB-TC Manuel d'utilisateur télécharger pdf (Page 31)

WEB-TC User's Guide Specifications

Digital input/output

Table 6. Digital input/output specifications

Digital type

CMOS

Number of I/O

8 (DIO0 through DIO7)

Configuration

Independently configured for input or output.

Switch selectable output voltages: +5 V and +3.3 V

Power on conditions

Power on reset is Input mode except when bits are configured to operate as

alarms.

Pull-up/pull-down configuration

All pins are connected to 47 kOhm resistors that share a common point

accessible at Pin 22 of the device (PU/D). This pin is floating by default and is

user-configurable via external connection. For pull-up mode, connect this pin

to Pin 21 (+5V). For pull-down mode, connect this pin to Pin 48 (GND).

Digital I/O transfer rate (software paced)

 Digital input – 50 port reads or single bit reads per second typical.

 Digital output – 100 port writes or single bit writes per second typical.

Input high voltage (+5 V mode)

4 V min, 5.5 V absolute max.

Input high voltage (+3.3 V mode)

2.64 V min, 5.5 V absolute max.

Input low voltage (+5 V mode)

1 V max., -0.3 V absolute min.

Input low voltage (+3.3 V mode)

0.66 V max., -0.3 V absolute min.

Output low voltage (IOL = 2.5 mA)

0.6 V max.

Output high voltage (IOH=-2.5 mA)

4.3 V min. (+5 V mode), 2.7 V (+3.3 V mode)

Note 7: Ground pins on the WEB-TC labeled GND are isolated from AGND pins and from earth ground.

Temperature alarms

Table 7. Temperature alarm specifications

Number of alarms

8 (one per digital I/O line)

Alarm functionality

Each alarm controls its associated digital I/O line as an alarm output. The input to each

alarm may be any of the analog temperature input channels. When an alarm is enabled, its

associated I/O line is set to output and driven to the appropriate state determined by the

alarm options and input temperature. The alarm configurations are stored in non-volatile

memory and are loaded at power on.

Alarm input modes

 Alarm when input temperature > T1

 Alarm when input temperature > T1, reset alarm when input temperature goes below T2

 Alarm when input temperature < T1

 Alarm when input temperature < T1, reset alarm when input temperature goes above T2

 Alarm when input temperature is < T1 or > T2

Note: T1 and T2 may be independently set for each alarm.

Alarm output modes

 Disabled, digital I/O line may be used for normal operation

 Enabled, active high output (digital I/O line goes high when alarm condition is met)

 Enabled, active low output (digital I/O line goes low when alarm condition is met)

Alarm update rate

1 second

Memory

Table 8. Memory specifications

EEPROM

512 bytes for sensor configuration

FLASH

2 MB for device configuration and website storage

Microcontroller

Table 9. Microcontroller specifications

Type

One high-performance 8-bit RISC microcontroller (isolated)

One high-performance 16-bit RISC microcontroller (non-isolated)

1 2 ... 26 27 28 29 30 31 32 33 34 35 36

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Measurement-computing WEB-TC Manuel d'utilisateur Page 31

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