User Manual

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Document ID: PB-ZB-MOD-003-20DS
3.3 RF FRONT END
This is a cost-effective and high performance RF Front End for low-power and low-voltage 2.4-GHz wireless applications. It is
a range extender for all existing and future 2.4-GHz low-power RF transceivers, transmitters and System-on-Chip products. It
increases the link budget by providing a power amplifier for increased output power, and an LNA with low noise figure for
improved receiver sensitivity. This FE consists of PA, LNA, RF switches, RF impedance matching, and balun for high
performance wireless applications. Module Block diagram with this Front End is shown below:
Fig. 3.3 Block diagram of the module with front end (Power level option “T”)
Functional description of the signals controlling front end are summarized in table 3.2 below
Table 3.2 Functional description of the Front End signals
FE Signal name
Direction
Description
STM32W108 port name
TxRx
Digital input to FE
When ENABLE = 1:
TxRx = 1: Transmit Mode
TxRx = 0: Receive Mode
PC5, TX_ACTIVE
HIGH_GAIN
Digital input to FE
Receive only (ENABLE = 1, TxRx = 0):
HIGH_GAIN = 1: LNA is in High Gain Mode.
LNA Gain = approx. 11dB
HIGH_GAIN = 0: LNA is in Lo Gain Mode.
LNA Gain = approx. 1 dB
PB5, ADC0
ENABLE
Digital input to FE
ENABLE = 1: FE Enabled
ENABLE = 0: FE in power down mode
PC6, nTX_ACTIVE
3.4 ZIGBEE STACKS
The three stacks are available (see block diagram below depicted on Fig. 3.4):
RF4CE stack
Proprietary stack
EmberZNet PRO stack
Fig. 3.4 Available stacks: Left. Proprietary stack, Centre. RF4CE stack, Right. EmberZNet PRO
For more details regarding stacks please consult [3], [4] [5]. Instruction concerning to programming ST32W108 you will find at
[7].