Wavecom GR64 UART Sleep Protocols Dokumentacja Pobierz pdf (Strona 83)

7.3. HARDWARE DESIGN

considering these attributes, it was considered it the ideal solution. The

antenna is attached to the sides of the enclosure with double-sided tape.

7.3.2 Processor

Selection Criteria

When considering the system processor, the following features should be

considered:

Power Consumption In order to maximise battery life under mains power

failure conditions, the chosen processor should support power saving

modes and generally have a low power consumption.

Operating Voltage This determines the level shifters which will be required

(if at all) to interface to other digital devices.

Operating Speed The device needs to be suﬃciently fast to process, store

and upload the data faster than real-time to ensure that no data is lost.

RAM Capacity There should be suﬃcient work-space for all required variables,

data rec ord arrays and system states storage.

Program Storage Capacity The program will include human-readable status

messages which must be stored along with the executing program.

Thus, suﬃcient space should be allowed f or all these messages, the

program itself and s pace for future expansion.

Non-Volatile Storage System settings and recorded data should be stored

in non-volatile memory to ensure system recovery from a power outage.

If the chosen process or does not provide non-volatile storage, an external

memory should be added.

on-board Peripherals Timers are required for creation of delays, analogue

to digital converters for system health monitoring and communication

ports for use with the G SM module, system status reporting and connection

to other modules.

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Wavecom GR64 UART Sleep Protocols Dokumentacja Strona 83