Nokia NSM-3 Series Technical Documentation Manual page 16

NSM–3/3D
System Module
The voltage limit (VLIM1 or VLIM2) is selected by logic LOW or logic
HIGH on the CHAPS (N101) VLIM input pin. In NSM–3 phones VLIM is
fixed low in HW.
When the switch in output overvoltage situation has once turned OFF, it
stays OFF until the the battery voltage falls below VLIM and PWM = LOW
is detected. The switch can be turned on again by setting PWM = HIGH.
VCH
VCH<VOUT
VOUT
VLIM
SWITCH
PWM (1 Hz)
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Issue 4 02/2002
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