The transceiver has two power supply pins, one for the core of the transceiver called VBAT and one for the host controllerinterface (SPI, DIOs, BUSY) called VBAT_IO. Both power supplies can be connected together in application. In case a lowvoltage micro-controller (typically with IO pads at 1.8 V) is used to control the transceiver, the user can:• use VBAT at 3.3 V for optimal RF performance• directly connect VBAT_IO to the same supply used for the micro-controller• connect the digital IOs directly to the micro-controller DIOs.At any time, VBAT_IO must be lower than or equal to VBAT.