OM-WEB Series User's Guide
Specifications
36
Throughput rate
Table 9. Throughput rate specifications
Number of input
channels
Maximum throughput
1
2 S/s
2
2 S/s on each channel, 4 S/s total
3
2 S/s on each channel, 6 S/s total
4
2 S/s on each channel, 8 S/s total
5
2 S/s on each channel, 10 S/s total
6
2 S/s on each channel, 12 S/s total
7
2 S/s on each channel, 14 S/s total
8
2 S/s on each channel, 16 S/s total
Note 13:
The analog inputs are configured to run continuously. Each channel is sampled twice per second.
The maximum latency between when a sample is acquired and the temperature data is provided by the
Ethernet unit and is approximately 0.5 seconds.
Digital input/output
Table 10. Digital input/output specifications
Parameter
Conditions
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 kΩ 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 the 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 14:
Ground pins on OM-WEB Series devices labeled GND are isolated from AGND pins and from
earth ground.
