NXP Semiconductors MKW01Z128, Reference Manual, Page: 57 / 884

Sub 1 GHz Transceiver Architecture Description
MKW01xxRM Reference Manual, Rev. 3, 04/2016
5-2 Freescale Semiconductor, Inc.
Figure 5-1. MKW01Z128 Transceiver Block Diagram
5.3 Transceiver Power Supply
The MKW01Z128 has separate power pins for both the MCU and the transceiver. The transceiver employs
on-chip regulation and management that provides stable operating characteristics over the full temperature
and voltage range of operation. This includes the full output power of +17dBm which is maintained from
1.8 to 3.6 V.
The transceiver voltage source is supplied via pins VBAT1 and VBAT2. See Section 4.2, “Power
connections” for power supply connection and bypassing details. Freescale recommends that the MCU and
transceiver be powered together from the same supply.
5.4 Low Battery Detector
A low battery detector is also included allowing the generation of an interrupt signal in response to passing
a programmable threshold adjustable through the register
RegLowBat . The interrupt signal can be mapped
to any of the DIO pins, through the programming of RegDioMapping .