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9150-0125-01 R-1
3. POWER MANAGEMENT
SIGNAL
PARAMETER
Input Voltage Range for Digital
V33_IN
Inputs
I33_IN
Input Current for Digital Inputs
Input Voltage Range for RF
VRF_IN
circuitry
IRF_IN
Input Current for RF Circuitry
Input Voltage Range for USB
VUSB
Device
Voltage range of VRF_EN
VRF_EN
output
Ripple voltage requirements
V33_ripple
for V33_IN
Ripple voltage requirements
VRF_ripple
for VRF_IN
I2C
Voltage range of I
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.
Default Thresholds for Different Power States
•
Partial Suspend: 3.5V
•
Full Suspend: 3.1V
•
Full Off: 2.7V
•
HW Protection Cutoff: 2.6V
To set different thresholds via AT command details refer UAPI document Section 21.5 Voltage-Based Power Management and
Section 21.6 State of Charge Power Management.
ST150M User Manual
RANGE
3.1 – 3.6
100 max
3.0 -3.6
500 max
4.75 – 5.75
0 - 3
0 – 50
0 - 50
0 – 3.3
C
2
Confidential & Proprietary Information
NOM.
UNITS
3.3
Volts
–
mA
3.3
Volts
–
mA
5.0
Volts
0
Volts
0
mV pk-pk
0
mV pk-pk
3.3
Volts
NOTES
50mV ripple max, 80uA
– 200mA depending on BLE/GPS
power and usage
50mV ripple max, 1.6A bursts @ 25ms during
transmit bursts. Integrator should ensure min
voltage during bursts does not drop below 3V
8
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