Wi.232FHSS-25-FCC-R datasheet(48/67 Pages) RADIOMETRIX

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WI.232FHSS-25-R/ WI.232FHSS-250-R DATASHEET

Revision 1.1.0

4.1.31. CMD Halts Traffic (regCMDHALT)

regNVCMDHALT (0x23)

regCMDHALT (0x6E)

R/W

Default CMD Halt Setting: Disabled (0x00)

When configuring the module’s register settings, it is possible that incoming RF transmissions can intermix

with the command interpreter’s response, making it difficult to determine if your commands were

successfully processed. Changing this register setting to 0x01 will cause the module to store incoming RF

traffic (up to RF buffer overflow) while the CMD line is low. When the CMD pin is returned high, the RF

engine will send all buffered data to the UART. This feature is present in all Wi.232FHSS-250-R modules

and Wi.232FHSS-25(-R) modules with firmware version 1.0.4 or newer.

4.1.32. Receiver LNA Mode (regLNAMODE)

regNVLNAMODE (0x24)

regLNAMODE (0x6F)

R/W

Default Receiver LNA Mode: High Sensitivity (Wi.232FHSS-25), AGC Enabled (Wi.232FHSS-250-R)

By default, the Wi.232FHSS-25 module is configured for maximum receiver sensitivity. Similarly, the

Wi.232FHSS-250-R is factory-configured to use its internal automatic gain control (AGC) circuit to manage

receiver sensitivity. Reducing the gain increases the linearity of the receiver, but reduces maximum

sensitivity; increasing the gain does the opposite. Generally speaking, higher linearity (increased third

order input intercept point, IIP3) will give improved performance in high-interference environments; high

gain yields better performance in low-interference environments.

The Wi.232FHSS-250-R contains an AGC circuit that manages these settings automatically, and it should

be used whenever possible. When reading the digital RSSI registers (regIMMEDRSSI, regLGPRSSI), the

internal calculation automatically compensates for the current LNA gain setting. However, when

attempting to make analog RSSI measurements, fixing the LNA gain will produce more meaningful results.

The following table summarizes the LNA settings for each of the modules.

LNA

Mode

WI.232FHSS-25-R

WI.232FHSS-250-R

Meaning

IIP3 Increase

Sensitivity

Decrease

Meaning

IIP3 Increase

Sensitivity Decrease

0x00

High

Sensitivity

Reference

AGC Enabled

Variable

0x01

High Linearity

15 dB

10 dB

High

Sensitivity

Reference

0x02

Invalid

N/A

Mid Linearity

19.1 dB

6.5 dB

0x03

Invalid

N/A

High Linearity

41.8 dB

9.5 dB

Table 18, LNA Mode Settings

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