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3 POWER MANAGEMENT
Note: -40º to +85ºC operating temperature
3.1 POWER MANAGEMENT HIGH LEVEL OVERVIEW
The Power UAPI is responsible for handling the different power states of the UAPI and switching between them.
The power states are based on configurable battery voltage thresholds. This module also handles the required
action before moving into a powered down state.
Power States
There are five different power states that have different limitations on them to control the amount of power of
the module:
• Normal: The device runs as normal with no restrictions.
• Factory: Same as normal, but if no solar input is detected for four hours, the device goes into the Full
Off state. This is the default state of the device when the factory configuration is on the device. Once
the user updates the configuration, this mode is inaccessible.
• Partial Suspend: The device is limited on the frequency of track messages it can send to reduce power
consumption.
• Full Suspend: The device cannot send any track messages.
• Full Off: The device sends a command to the fuel gauge to fully disconnect the ST150 module from
power. Only light on the solar panel can wake the device up from this state.
V33_IN Input Voltage Range for Digital Inputs 3.1 – 3.6 3.3 Volts
50mV ripple max, 80uA
– 200mA depending on
BLE/GPS power and
I33_IN Input Current for Digital Inputs 100 max – mA
VRF_IN Input Voltage Range for RF circuitry 3.0 -3.6 3.3 Volts
50mV ripple max, 1.6A
bursts @ 25ms during
transmit bursts.
Integrator should
ensure min voltage
during bursts does not
IRF_IN Input Current for RF Circuitry 500 max – mA
VUSB Input Voltage Range for USB Device
5.75
5.0 Volts
VRF_EN Voltage range of VRF_EN output 0 - 3 0 Volts
V33_ripple
Ripple voltage requirements for V33_IN 0 – 50 0 mV pk-pk
VRF_ripple Ripple voltage requirements for VRF_IN 0 - 50 0 mV pk-pk
I2C Voltage range of I
2
C 0 – 3.3 3.3 Volts
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