UPD77533 datasheet(26/104 Pages) RENESAS

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Data Sheet S15671EJ4V0DS

µµµµPD77533

5. POSITIONING CONTROL

An outline of the positioning flow is shown in Figure 5-1 below.

Caution ACK and NACK have been omitted from the figure.

The ADC power can also be controlled by the RFON pin, but care must be taken with the control

logic.

Figure 5-1. Outline of Positioning Control

PB1005K

PD77533

ADC

TCXO

Mobile

specified RAM

Host CPU

Power off

Power on

(CLK off)

Power on

Initialization

Settings

Power ON

RESETB

Settings

Commands preset for positioning

. Character Timeout

. FCC Reference Frequency

. TXACTV Control

. Frequency Calibration Control

. Flow Point Control

(Processing End) output setting

Power off

Positioning response (!jm)

Positioning directive

($JM)

RFON = 1

AGC, DCOFF

output starts

(CLK on)

Power on

ADC, DCOFF

start

RFON = 0

AGC, DCOFF

output stops

(CLK off)

RF block ON

SnapShot (GPS signal reception)

Power off

ADC, DCOFF

stop

RF block ON

Pseudo range

calculation

Calculation result

(!hd)

Power off

After receiving the positioning

directive ($JM) from the LS

(location server), the PD77533

may repeat the processing inside

the dotted lines (the processing

from when ADSCK output starts to

when the calculation result (!hd) is

sent) (for the number of repetitions

specified by the LS).

Pin input

Command input

Remark

Power on

ADSCK output starts

ADSCK output stops

Positioning end notification (Processing End)

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