File : CS-SUP-MUTI-WTHERMAPP-E01.sxw
7.8 END OF BATTERY LIFE DETECTION
To detect the end of battery life, the
WaveTherm
module uses the power metering principle rather than
measurement of the battery voltage. Lithium batteries are, in particular during passivation, unsuitable for the
voltage measurement method to determine the remaining capacity.
The
WaveTherm
records and evaluates all events (measurements, transmissions) to decrement the power
meter according to the battery used. When the meter passes below a predefined threshold, the “end of
battery life” is signalled with the
Application Status
byte.
The initial value of the end-of-life meter is factory-set. It depends on the type and number of batteries used.
When the end of battery life is detected, the detection date is memorised and may be read with a radio
command.
7.8.1 Description of the parameters used
Parameter
number
Description
Size
(in bytes)
Access
Right
Default value
0x20
Application Status
1
R/W
0x00
0x90
Date of detection of end of battery life
6
R/W
0x00
0xA2
Battery life duration counter
2
R
0xC15C
When the end of battery life is detected, the bit b0 of the
Application Status
is set to 1 ; and the detection date
is stored. This date can be read by a standard read command of internal parameter (format of the date
described in chapter 7.1.3).
MSB
LSB
Application Status
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
detection
0:
not
detected
1:
detected
Low
Threshold of
sensor 2
0:
not
detected
1
: detected
High
Threshold of
sensor 2
0:
not
detected
1
: detected
Low
Threshold of
sensor 1
0:
not
detected
1
: detected
High
Threshold of
sensor 1
0:
not
detected
1
: detected
number of detected
sensors
0 :
0 or 1 sensor
detected
1 :
2 sensors detected
-
End of
battery life
0:
not
detected
1
: detected
WaveTherm modules – application handbook
page 64 of 65
