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Analogue 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.