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Baseband Lsi. CXD2956AGL-1 Datasheet |
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GPS Baseband LSI
CXD2956AGL-1
Description
The CXD2956AGL-1 is a dedicated LSI for the GPS
(Global Positioning System), satellite-based location
measurement system.
Compared with conventional methods, position
detection time and sensitivity are substantially
improved with the use of an advanced signal
processing scheme.
Although package sizes differ, the CXD2956AGL-1
has realized compatibility with a foot pattern to the
CXD2963GH.
This LSI used together with the Sony GPS RF down
converter IC enables the configuration of a 2-chip
system capable of measuring its position anywhere
on the globe. The CXD2956AGL-1 is ideal for use in
automotive, cellular handset, handheld navigation,
mobile computing and other location-based applications.
Features
• 12-channel GPS receiver capable of simultaneously
receiving 12 satellites
• Reception frequency: 1575.42MHz
(L1 band, CA code)
• Reference clock (TCXO) frequency:
18.414MHz (GPS, Sony compatible),
• 32-bit RISC CPU (ARM7TDMI)
• 288K-byte Program ROM
• 72K-byte Data RAM
Power is supplied only to 8K-byte Data RAM while
in backup mode.
• System power management
• 1-channel UART
• Internal RTC (Real Time Clock)
• 10-bit successive approximation system A/D
converter
• All-in-view positioning
• Communication format: Supports NMEA-0183
• Supports DGPS (optional)
Conforms to RTCM SC-104 Ver. 2.1 and DARC
• 1 PPS output
• Supports assisted-GPS for cellular (optional)
183 pin VFLGA (Plastic)
Absolute Maximum Ratings
• Supply voltage I/O IOVDD
• Supply voltage core CVDD
• Input voltage
VI
• Output voltage
VO
• Operating temperature Topr
• Storage temperature Tstg
–0.5 to +4.6
–0.5 to +2.5
–0.5 to +6
–0.5 to +6
–40 to +85
–50 to +150
V
V
V
V
°C
°C
Recommended Operating Conditions
• Supply voltage I/O IOVDD 3.0 to 3.6
∗ Under operation with internal ROM, using no
external expansion bus: IOVDD 2.6 to 3.6V
∗ Under operation in backup mode:
BKUPIOVDD 2.5 (Min.) V
• Supply voltage core CVDD 1.62 to 1.98
• Operating temperature Topr –40 to +85
V
V
°C
Input/Output Pin Capacitance
• Input capacitance
CIN
• Output capacitance COUT
• I/O capacitance
CI/O
9 (Max.)
11 (Max.)
11 (Max.)
pF
pF
pF
Structure
Silicon gate CMOS IC
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E04729-PS
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CXD2956AGL-1
Performance
• Tracking sensitivity: –152dBm (average) or less
• Acquisition sensitivity: –139dBm (average) or less in normal mode
–150dBm (average) or less in high sensitivity mode
∗ Reference data using the Sony's reference board when using both an antenna of 25dBi gain and a RF
amplifier with NF ≤ 2dB, 25dB gain.
• TTFF (Time to First Fix):
Time until initial position measurement after power-on with the following conditions:
Cold Start (without both ephemeris and almanac time): 50s (average) / 60s (95% possibility)
Warm Start (without ephemeris but with almanac time): 35s (average) / 40s (95% possibility)
Hot Start (with both ephemeris and almanac time): 2s (minimum) / 6s (95% possibility)
∗ Reference data with elevation angle of 5° or more and no interception environment with satellite powers
≥ –130dBm. (Not in high sensitivity mode)
Note) "95% possibility" means "position time with 95% possibility".
• Positioning accuracy:
2DRMS: approx. 5m
∗ Reference data with elevation angle of 5° or more and no interception environment with satellite powers
≥ –130dBm.
• Measurement data update time: 1s
• Current consumption:
40mW (average) while position calculating with tracking satellites in low power mode
90mW (average) while position calculating with acquiring and tracking satellites
∗ Reference data using the Sony's reference board when the reference clock input is 18.414MHz, and its
amplitude is 3.3V swing.
• 1PPS output
1µs or less precision, 1PPS outputs from ECLKOUT (Pin 97).
Note) These values are not guaranteed, depending on the conditions.
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Block Diagram
IF
1.023MHz
CXD2956AGL-1
TCXO
Reference clock
18.414MHz
(GPS,
Sony compatible)
Acquisition Block
• Acquire GPS signals
Tracking Block
• Locking to GPS signals
• 12ch correlations
Costas Loop & DLL
Computation & Control
• Control acquisition &
Tracking block
• Position calculation
ARM7TDMI
RTC
Timer
3ch
RAM
72KB
ROM
288KB
X'tal
32.768kHz
External bus
UART
A/D
–3–
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