WM_PRJ_Q2400_PTS_005 -007
18th January 2006
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How to choose R1 and C1:
How to choose R1:
R1 has to be chosen to have a full range of BAT_TEMP (from 0 V to 2.8 V)
when the CTN value changes from the minimum to the maximum
temperature.
How to choose C1:
C1 has to be chosen to have a RC filter with a time constant lower than
2 ms.
Calculation examples:
CTN(+25 °C) = 47 kΩ
CTN(+55 °C) = 10 kΩ
CTN(-10 °C) = 300 kΩ
CTN(-10 °C) x VCC = ( CTN(-10 °C) + R1 ) x BAT_TEMP (full range)
R1= 47 kΩ BAT_TEMP(-20 °C) = 2.42 V
BAT_TEMP(+55 °C) = 0.49 V
R(-20 °C) = R1//CTN(-10 °C) = 40 kΩ
R(+55 °C) = 8 kΩ
With C= 10 nF:
RC(-20 °C) = 400 µs
RC(+55 °C) = 80 µs
2.5 ON / ~OFF
This input is used to switch ON or OFF the WISMO module. A high level signal
has to be provided on the pin ON/~OFF to switch ON the module. The level of
the voltage of this signal has to be maintained between 2.4 V and VDD during a
minimum of 1 s. This signal can be left at high level until switch OFF.
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