Accelerometer; Factory Hardware Configuration; Proprietary Motion Activated Track; Custom Hardware Configuration - Globalstar ST100 User Manual

8545-0194-01 v1.0

2.12. ACCELEROMETER

2.12.1. FACTORY HARDWARE CONFIGURATION

The ST100 is shipped from the factory with the Accelerometer connected to the ASIC processor.
Rather than issue the normal "track" command, during configuration, the VAR may issue the binary command "Proprietary
Motion Activated Track". This will cause the ASIC to use the accelerometer for motion detection.
Custom Nordic firmware written by the VAR using the Globalstar ST100 SDK may also be used to invoke this special track
mode. All interface to the ASIC processor from such custom code is via the binary serial packed commands described in
section 4.2.

2.12.1.1. Proprietary Motion Activated Track

In this mode, the ST100 uses the same proprietary motion detection algorithm as the SPOT branded SPOT Gen3, SPOT Gen4,
SPOT Trace, and SPOTX products. Track reporting is suspended when the accelerometer indicates that the device is not
moving and operates when the accelerometer indicates that the device is moving. This is the mode that is the default mode on
the SPOT branded products listed here. (These products do not offer non-suspending track, which is the most common mode
used in the ST100).

2.12.2. CUSTOM HARDWARE CONFIGURATION

The ST100 can be ordered with the I2C lines and interrupt lines of the accelerometer routed to the Nordic processor. With
this special order, the customer is expected to write custom code using the ST100 SDK to implement whatever algorithm he
chooses on the accelerometer.
• In this configuration, the Nordic processor has direct control of the accelerometer.
• The accelerometer is an ST Micro LIS3DH. The user must program and access it directly.
• Data sheets and programming guides for the accelerometer are available at:
https://www.st.com/en/mems-and-sensors/lis3dh.html
Note, however that the ASIC has control over the accelerometer's power. The custom code written by the VAR using the SDK
must turn the accelerometer on and off using the "Turn Accelerometer On/Off" command (see section 4.2. BINARY SERIAL
PACKET COMMANDS, page 30).
ST100 User Manual v1 Confidential & Proprietary Information 13