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The actuator allows the end user application to monitor and compute the energy status through regular measurement of the device internal parameters. Internal storage voltage STV (V) and average current generated ACG (µA) are actual measured values whereas average current consumed ACC (µA) is a computed value. The computed average current consumed value includes motor amount and direction of movement, radio data rate, radio communication frequency, and sleep current. The following two diagrams are illustrations of the energy balance from a running application.
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Energy Storage
The actuator uses its status bit "Energy Storage" to indicate that its long-term operation has consumed more energy than it generated. The remaining charge level at this point is approximately 25%, which is why the device continues with full functionality while signaling a negative energy balance to the user. It is strongly recommended to regularly check the ES bit in order to recognize a discharge of the storage and to prevent its progression by suitable measures (e.g. Slow Harvesting outside of the standard operating times). If the energy storage continues to discharge and its voltage falls below a certain limit, then the device automatically goes into the state of Forced Heating.
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Energy storage typical voltage values
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Voltage [V] LTO
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Fully charged – for charge stop (bq25505 and USB)
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2.8
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Fully charged – for indicator bit
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2.7
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Normal operation
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2.4 typical (2.0 … 2.8)
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Energy storage bit set when below
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2.3
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Forced Heating starts when below
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2.0
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Forced Heating stops when above
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2.4
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Microcontroller turning off all loads and its own power when below
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1.8
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Microcontroller power-up (under hardware-control) when above
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2.37
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Battery spec HTC1450 (capacity / charge stop / discharge stop)
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>500mAh / 2.8V / 1.5V
PORT 0 - MAC Command 0x06
If, on Port 0, a MAC command 0x06 is sent to the device, the device returns battery level information.
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Device Response
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Battery Level
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0
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The device is connected to an external power source
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1
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2.00 V
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1 <= d <= 254
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254
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2.64 V
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255
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