CC2431ZRTCR datasheet(9/16 Pages) TAOS

Part #	CC2431ZRTCR

Description	System-on-Chip for 2.4 GHz ZigBee/ IEEE 802.15.4 with Location Engine

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Manufacturer	TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]

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CC2431

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10*log10(distance)

Path Loss vs. log-distance for source 0x85, Z=2.1082. A=42.4103, n=2.9773

Figure 2: Path loss vs. log distance

2.1.2.1.4 Search Boundary Coordinates

It is possible to reduce error and estimation

time by setting search boundaries for the

estimated location X and Y coordinates. The

maximum area that can be considered is with

X and Y in the interval [0.0, 63.75] meters.

Assume that the Location Engine search is to

be limited to include only the rectangular area

bounded by the coordinates [xmin, ymin] and

[xmax, ymax].

Four search boundary parameters are entered

in the following order:

xmin, xdelta , ymin, ydelta

where:

xdelta = xmax - xmin

ydelta = ymax - ymin

Note that even when it is chosen to search in

the

whole

possible

search

space,

these

coordinates

must

be

entered

as

the

coordinates for the whole space, i.e. the

following values: 0.0, 63.75, 0.0, 63.75.

If some input parameters are omitted the

Location Engine will not estimate correctly.

2.1.2.1.5 RSSI Values

The RSSI values are the RSSI measurements

corresponding

to

the

set

of

reference

coordinates. The RSSI values are within the

interval [-40 dBm, -95 dBm] with precision 0.5

dBm. The negative sign is removed in the

value written. As an example, in the case

where the value RSSI = -50.35 dB, this would

be written into the location engine as 50.5.

Note that a value of 0.0 must be written as

RSSI value for unused reference coordinates,

if less than 16 reference nodes are used. The

engine will not function correctly if only some

of the parameters are loaded.

2.1.2.2 Loading Parameters

All measured parameters described in the

previous sections are loaded into the RF

register

MEASPARM

.

Before

writing

to

MEASPARM

, a 1 must be written to the register

bit LOCENG.PARLD to indicate that a set of

measured parameters are being written. Once

the

parameter

load

process

commences

CC2431 Data Sheet (Rev. 2.01) SWRS034B

Page 9 of 15

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