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UPD77533 Datasheet(PDF) 26 Page - Renesas Technology Corp

Part # UPD77533
Description  MOS INTEGRATED CIRCUIT
PDF  104 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD77533 Datasheet(HTML) 26 Page - Renesas Technology Corp

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Data Sheet S15671EJ4V0DS
24
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
µ
PD77533
µ
ADC
TCXO
Mobile
specified RAM
Host CPU
LS
Power off
Power off
Power off
Power off
Power off
Power on
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
Power off
Power off
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
µ
ADSCK output starts
ADSCK output stops
Positioning end notification (Processing End)



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