SONY GXB5005

SMD Type GPS Receiver Module
GXB5005
Description
The GXB5005 is a 12-channel GPS (Global Positioning System) receiver module.
This small module includes all the functions required for GPS and is designed for using an active antenna.
The GXB5005 can support the various kinds of the portable applications as well as the car navigation system.
Features
‹ General
Š
Š
Š
Š
Implementation of Sony CXD2951GA-4 single chip GPS
Small size with SMD type pads and shield case
Module size (typ.):
22.4 (W) × 23.5 (D) × 3.2 (H) [mm]
Current consumption:
Acquisition (typ):
70 [mA]
Tracking (typ):
41 [mA]
Battery backup (typ): 7 [µA]
Š Datum:
WGS-84
Š Communication method: Supports NMEA-0183 version 3.01
Š Internal 32.768kHz RTC
Š Internal 18.414MHz TCXO
Š Antenna input 50Ω
Š Recommended antenna element
An active antenna with 0dB and RF amplifier with NF ≤ 2dB, 8 to 30dB gain
‹ Functionality
Š 12-channel GPS receiver capable of simultaneously receiving 12 satellites
Š All-in-view measurement
Š Valid fix indication output
Š 1PPS output
Š WAAS/EGNOS compatible
Š Supported baud rate:
4800bps/9600bps/19200bps/38400bps by HW setting
Š Internal power on reset circuit
Š Antenna sense (option)
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.
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E05728-PS
GXB5005
‹ Performance
Š Tracking sensitivity:
–152dBm (typ.)
Š Acquisition sensitivity:
–139dBm (typ.)
Š Time to first fix (time until initial measurement after power-on) (typ., Open sky)
Cold start (without ephemeris and almanac): 40s
Warm start (without ephemeris with almanac): 33s
Hot start (with ephemeris and almanac):
2 to 3s
Š Positioning accuracy (Open air with ≥ –130dBm, PDOP ≤ 2.0)
Stand alone (GPS unit only) 2DRMS: approx. 2m
Š Follow-up performance: Velocity:
500km/h or less
Acceleration: 1G or less
Absolute Maximum Ratings
Item
Symbol
Min.
Max.
Unit
Power supply voltage
VDD
–0.5
3.7
V
Input voltage
VI
–0.5
5.5
V
Output voltage
VO
–0.5
VDD + 0.5
V
Operating temperature
Topr
–40
+85
°C
Storage temperature
Tstg
–40
+105
°C
Operating Conditions
Item
Symbol
Min.
Typ.
Max.
Unit
3.1
3.4
3.7
V
50
mVp-p
3.0
V
5.5
V
Power supply voltage
VDD
Power supply voltage ripple
VDD-rip
Backup battery voltage
Vbat
2.6
VIN
–0.3
Input pin voltage
(25°C)
2.8
ICC
70
mA
Supply current: Tracking (25°C)
ICC
41
mA
Standby current
Istdby
7
120
µA
Operating temperature
Topr
+25
+85
°C
Reception frequency, L1 CA code
FIN
Supply current: Acquisition
–40
1575.42
-2-
MHz
GXB5005
Architecture
CXD2951
TCXO
CMOS Radio Block
Freq.
Synthesizer
CPU
BPF
Down
Converter
LNA
SAW
LNA
LPF
1 bit
RF/IF Unit
1.023MHz
TCXO
Baseband Unit
Acquisition Block
Tracking Block
Host I/O
Control signal
JTAG, GPIO, etc.
ARM7TDMI
Time
Counter
RTC
CXO
32.768kHz
CPU
TCXO
Multiplier/
Divider
RAM/
ROM
Computation & Control Block
CPU, Counter
DLL, D.MF, S/P
18.414MHz
-3-
1.8V
Regulator
GXB5005
Pin Configuration
(Top View)
32kHz X'tal
22.4mm
3. ANT Cont
4. BR1
5. BR0
6. RXD0
7. TXD0
8. WA1
9. WA0
Regulator
23.5mm
19. 1PPS
18. B.U.
17. VDD
16. RST CXD2951
15. GND
14. GND
13. Status Out
12. RF GND
11. RF IN
10. RF GND
1. AD In0
2. AD In1
LNA
TCXO
Pin Description
Pin No.
Symbol
I/O
Description
1
AD In0
I
Antenna sense input 0
2
AD In1
I
Antenna sense input 1
3
ANT Cont
4
BR1
I
Baud rate setting 1
5
BR0
I
Baud rate setting 0
6
RXD0
I
UART (CH0) reception data
7
TXD0
O
UART (CH0) transmission data
8
WA1
I
WAAS enable 1
9
WA0
I
WAAS enable 0
10
RF GND
11
RF IN
12
RF GND
RF GND
13
Status Out
Status output
14
GND
GND
15
GND
GND
16
RST
17
VDD
Power supply 3.4V
18
B.U.
Battery backup 2.8V
19
1PPS
I/O
Antenna sense enable (High active)
RF GND
I
I
O
GPS signal input
Hardware reset (Low active)
1PPS output
-4-
RF
Shield Case Land
GXB5005
Baud Rate Setting
Baud rate
BR1
BR0
4800
Open (L)
H
9600
Open (L)
Open (L)
19200
H
Open (L)
38400
H
H
WAAS Enable
WAAS
Command*1
*1
WA1
WA0
Open (L)
Don’t care
Disable
H
Open (L)
Enable
H
H
WAAS function is set by @WA command via UART when WA1 is Low.
-5-
GXB5005
Electrical Characteristics
DC Characteristics
(Ta = –40 to +85°C)
Item
Symbol
Supply voltage
Supply voltage ripple
Input
voltage
Output
voltage
Condition
Min.
Typ.
Max.
Unit
VDD
3.1
3.4
3.7
V
17
Vbat
2.6
2.8
3.0
V
18
50
mVp-p
VDD-rip
Pins
17, 18
H level
VIH
2.0
5.5
V
L level
VIL
–0.3
0.8
V
3, 4, 5, 6, 8,
9, 16
AD
VAD
0
(VDD – 0.1)
V
1, 2
H level
VOH
IOH = –8mA
L level
VOL
IOL = 2mA
Current consumption
ICC (3.3V)
Istdby
2.4
V
0.4
Acquisition
70
Tracking
41
Vbatt = 2.8V
7
V
3, 7, 19
mA
17
µA
18
120
AC Characteristics
(Ta = 25°C)
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
C/N output value
CN
–130dBm input,
Tracking, *1
TCXO frequency
Ftcxo
Internal
Message latency
Tl
RF gain
Grf
114
dB
Noise figure
NF
2
dB
Output signal rise time
Ttlh
Zload = 5kΩ,
20pF
25
55
ns
Output signal fall time
Tthl
Zload = 5kΩ,
20pF
30
60
ns
*1
42
dB
18.414
MHz
1.0
Using SONY evaluation software “GPS View”
Timing of Output Signal
Pin 7
(TXD0)
90%
20pF
5kΩ
90%
Ttlh
10%
-6-
10%
s
GXB5005
Status Out
“Status Out” signal turns over
1. Definition of internal status
Š Searching: Searching satellites after initialization
Š Tracking:
Navigation message decoded at least one satellite
Š Positioning: Position fixing
2. “Status Out” status by each internal status
Š Reset:
Input, pulled down internally
Š Initialization: Output Low
Š Searching: Output 1s High, 1s Low turn over
Š Tracking:
Output 0.5s High, 0.5s Low turn over
Š Positioning: Output High (keeping)
1
3
2
4
H
Searching
1.0s
1.0s
L
H
0.5s
Tracking
0.5s
L
H
Positioning
L
3. Jitter
Turns over regular pulse width ±5% max.
|T – T1| / T ≤ 5%
T
T
H
H
T1
T1
L
L
T: Regular pulse width (1s/0.5s)
T1: Actual pulse width
4. Status transition
Check internal status every 0.5s, only the status changes, “Status Out” output logic turns over and keeps
specified High-Low output interval.
Only status changes to positioning, “Status Out” output turns over High caused by the previous status.
1.0s
0.5s
High
Status Out
Low
Searching
Tracking
Change state
-7-
Positioning
Change state
GXB5005
UART Interface
Interface:
Baud rate:
Start bit:
Data bit:
Stop bit:
Parity bit:
Flow control:
Data output cycle:
Asynchronous serial interface (UART)
4800bps/9600bps/19200bps/38400bps
1 bit
8 bits
1 bit
None
Xon/Xoff
Approximately 1 second (default)
1
LSB
D0
MSB
D1
D2
D3
D4
D5
D6
D7
0
Start bit
1 bit
Data bit
8 bits
Stop bit
1 bit
NMEA0183 Format
The GXB5005 can output 8 different types of sentence: GPGGA, GPGLL, GPGSA, GPGSV, GPRMC, GPVTG,
GPZDA and PSGSA. If 9600bps, 19200bps or 38400bps baud rate is set for port setting, it outputs 7 types of
sentence: GPGGA, GPGSA, GPGSV, GPRMC, GPVTG, GPZDA and PSGSA as default. Moreover, if 4800bps
baud rate is set, it outputs 4 types of sentences: GPGGA, GPGSA, GPGSV and GPRMC as default.
NMEA Message Output Timing
NMEA messages are output within 1s after the 1PPS pulse.
t+1
t+2
t+3
t+4
t+5
t+6
T
1PPS
t+1
t+2
t+3
-8-
t+4
t+5
t+6
NMEA
GXB5005
1PPS Output
The 1PPS output provides a timing pulse synchronized to GPS time once a valid fix is available.
The figure below shows the behavior of the 1PPS output signal after reset. For a period of 160µs after reset,
the 1PPS signal outputs the system clock. The actual 1PPS signal is activated at 500ms after reset.
Reset 1+
ECLKOUT (1PPS)
500ms
1PPS signal output occurs 500ms after reset
Expansion
160µs
Reset 1+
ECLKOUT (1PPS)
CPU clock exists for 160µs after reset
Expansion
Reset
1+
ECLKOUT (1PPS)
145ns
(6.90MHz)
-9-
GXB5005
Backup Mode
The backup mode is established by setting all inputs Low except for B.U. (Vbat: 2.6 to 3.0V). In this mode, the
low power consumption can be achieved by stopping all oscillators except for RTC oscillator. Although all
registers are initialized, the SRAM for both of Ephemeris data and Almanac data in backup area are held.
Antenna Sense (Option)
The antenna sensing function detects three kinds of external active antenna connection conditions, open/
normal/short, by using A/D converter incorporated into the CXD2951.
The @ANT command shows the previous antenna sensing result and users would know the three kinds of
conditions. For details, see the CXD2951 Communication Command Specifications.
T+1
T+2
T+3
T+4
T+5
T+6
T+7
T+8
T + 9 T + 10 T + 11 T + 12 T + 13 T + 14 T + 15 T + 16 T + 17
RTC
Antenna
condition
Voltage
(RFIN)
open
normal
normal
short
VDD
0
Approx.1s
Approx. 3s
Antenna status detection timing
Threshold Levels
The threshold current Ir is as follows when VDD = 3.3V.
Š open:
Ir < 3.6mA
Š normal: 3.7mA ≤ Ir ≤ 44.0mA
Š short: 44.0mA < Ir
- 10 -
Approx. 3s
(Second)
GXB5005
Reference Circuit
The antenna sense circuit is available by putting a few components on the customer board.
Refer to the following diagram.
Antenna Power 3V
GXB5005
10kΩ
CXD2951
EPORT12
Sense Resistor
(1/8W)
22Ω
ANT Cont
EVON1
EVON0
AD In1
AD In0
Choke Coil
Inductor
Customer Board
Antenna
Connector
To Active
Antenna
Command Specifications
The GXB5005 modules have a command format, NMEA-0183 version 3.01. A list of the supported UART
interface is as follows. For detailed descriptions, see the CXD2951 Communication Command Specification
document.
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GXB5005
Mechanical Dimensions
9.8
Top View
(Unit: mm)
P = 2.2
1.2
R0.4
22.4
21.55
1.1
1.1
P = 2.2
3.2
23.5
22
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Sony Corporation