astra telematics AT240 Manual do utilizador - Página 11
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Imprimir páginaAnalogue to Digital Converter (ADC) Inputs
ADC1 can be used to measure analogue voltages up to 5.0V maximum
ADC2 can be used to measure analogue voltages up to 15.0V maximum
External scaling can be used to measure higher voltages if necessary.
Integrated Accelerometer(s)
The AT240A has a built in 3 axis MEMS accelerometer that operates in the range ±2g and is used
to measure driver behaviour (acceleration and braking) during normal driving conditions.
The accelerometer also allows the AT240 to wake from sleep on movement, with configurable
thresholds. Please refer to the MEMS parameter and Power Management section for more
details.
iButton / Temperature Probe (1-wire) Interface
This can be used with iButton devices for the purpose of driver ID, or with DS18B20 temperature
probes. Please refer to the appropriate application notes for more details of how to use these
features.
CANBus
The AT240 has integrated CANBus. Please refer to CANBus and FMS Application Notes for details
of supported protocols and features.
IMPORTANT NOTE: The CANBus pins are ESD protected to 15kV, but can only withstand
a continuous voltage of 12V maximum. These pins must not be used for any other
application to avoid damage to the device.
4.2V and 3.3V Outputs
These are reserved for use with external devices. The 3.3V regulated output can be used as a
reference voltage for external temperature sensors and used with the ADC1 input. These
outputs are fused at 150mA, maximum recommended current drain is 100mA.
Device Configuration / Settings
For device configuration options and related commands, please refer to the Astra Telematics
Command Reference document, which describes our generic commands, which can be used with
all our devices.