WSN1120L current consumption
The current consumed by a WiSense LPWMN wireless sensor node in sleep mode determines how long the power source will last if the node is configured to operate in RFD (reduced function device) mode and is running on limited energy supply such as a pair of AA/AAA batteries.
The WSN1120L has a bunch of ICs (micro, radio and two serial EEPROMS). When the WiSense stack puts the node into sleep mode, all of these ICs are put into their respective sleep modes (usually the mode with the lowest power consumption). The node’s total sleep mode current is the sum of the sleep mode currents of all these chips.
The pic below shows the total current (2.2 uA) consumed by a WSN1120L node in sleep mode.
The pic below shows the current (0.1 uA) consumed just by the radio (in sleep mode) on a WSN1120L node. This matches the number (0.12 uA) given in the CC1120’s datasheet. The CC1120 retains all of the important configurable registers in sleep mode so no need to reprogram these registers after waking up the CC1120.
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