Nordic Semiconductor Asa

Janne Juusola

Mikko Lintonen

Jarmo Väänänen

A voltage monitoring circuit portion is arranged to monitor a negative supply voltage (V) and comprises a negative voltage generator arranged to generate the negative supply voltage (V) and to output the negative supply voltage (V) at an output terminal. A capacitor is arranged so that a first capacitor plate is connected to the output terminal of the generator and to a reference node via a potential divider. The potential divider is arranged to produce a monitor voltage (V) between the resistors, where the reference node is supplied with a positive predetermined reference voltage (V). A comparator compares the monitor voltage (V) to a threshold voltage (V) and to produce an output signal having a first value when the monitor voltage (V) is below the threshold voltage (V) and having a second value otherwise. The negative voltage generator is enabled only when the output signal has its second value.

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Oulu, Finland

Janne Juusola