W2SG0008i-B-T - Wi2Wi - Datasheet.Live

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Product Datasheet

ALT-PDT-DOC Revision 1.48

June 10, 2013

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Table of Contents

1 General Description ..................................................................................................................4

1.1 Pin Definition ................................................................................................................................. 5

1.2 Pin Configuration ........................................................................................................................... 6

1.3 System Block Diagram .................................................................................................................. 7

1.4 Power Supply Considerations ....................................................................................................... 7

2 Specifications............................................................................................................................7

2.1 Clock Frequency ........................................................................................................................... 7

2.2 Interfaces ....................................................................................................................................... 8

2.2.1 Host UART Interface ............................................................................................................. 8

2.2.2 Host I2C Interface .................................................................................................................. 8

2.2.3 Host Slave SPI ...................................................................................................................... 9

2.3

Master Mode I

C Interface [Dead Reckoning (DR) I

C Interface]

........................................... 9

3 Specific Pin Functions ..............................................................................................................9

3.1 Baud Rate Selection ..................................................................................................................... 9

3.2 On / Off ........................................................................................................................................ 10

3.3 Wake Up ...................................................................................................................................... 11

3.4

External Interrupts (EIT1 & EIT2) ................................................................................................ 11

3.5 Time Mark (TM) ........................................................................................................................... 11

3.6 Auto Start Feature ....................................................................................................................... 11

4 WAAS with SBAS or Wide Area Differential GPS...............................................................12

4.1 Differential GPS........................................................................................................................... 12

4.2 Wide Area DGPS or WAAS ........................................................................................................ 12

4.3 How do we enable WAAS-SBAS on the W2SG0008? ............................................................... 13

5 Electrical/RF Characteristics: Operating ................................................................................14

6 Performance ............................................................................................................................15

6.1 Acquisition Time .......................................................................................................................... 15

6.2 Position Accuracy (3-D NAV) ...................................................................................................... 15

6.3 Environmental Characteristics .................................................................................................... 16

6.4 Current and Power Consumption ................................................................................................ 16

7 Antenna ...................................................................................................................................17

8 Normal Mode of Operation ....................................................................................................17

9 Development Support .............................................................................................................18

10 Mechanical Information .........................................................................................................18

10.1 Mechanical Specification ............................................................................................................. 18

10.2 Storage and Baking Instructions ................................................................................................. 19

10.3 Recommended Reflow Profile ..................................................................................................... 19

11 Ordering Information ..............................................................................................................20

11.1 Evaluation Kits............................................................................................................................. 21

12 Disclaimers .............................................................................................................................21

12.1 Datasheet Status ......................................................................................................................... 22

13 Certifications ..........................................................................................................................22

14 References ..............................................................................................................................22

14.1 Specifications .............................................................................................................................. 22

14.2 Trademarks, Patents and Licenses ............................................................................................ 22

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

List of Figures:

Figure 1: Pin Configuration ............................................................................................................ 6

Figure 2: System Block Diagram .................................................................................................... 7

Figure 3: Power on Sequence ....................................................................................................... 10

Figure 4: Traditional DGPS System ............................................................................................. 12

Figure 5: SBAS Example System ................................................................................................. 13

Figure 6: Normal Mode of Operation (USB Dongle Reference Schematic) ................................ 17

Figure 7: Mechanical Dimensions ................................................................................................ 18

Figure 8: Recommended Reflow Profile ...................................................................................... 20

Figure 9: W2SG0008i Module on USB Dongle Evaluation Board .............................................. 21

List of Tables:

Table 1: Pin Definition.................................................................................................................... 5

Table 2: Absolute Maximum Ratings ............................................................................................. 8

Table 3: Host Interface Selection .................................................................................................... 8

Table 4: Pin Configuration for Baud Rate Selection at Start-up .................................................... 9

Table 5: Operating Electrical Characteristics ............................................................................... 14

Table 6: Average Time to First Fix............................................................................................... 15

Table 7: Positional Accuracy ........................................................................................................ 15

Table 8: Environmental Characteristics ........................................................................................ 16

Table 9: Current and Power Consumption.................................................................................... 16

Table 10: Ordering Information .................................................................................................... 20

Revision History:

Rev.

Revision Date

Originator

Changes

1.0

June 12, 2010

WJL

Initial draft

1.1

Dec 23, 2010

WJL

Updated Pin list, corrected text

1.22

Apr 15, 2011

WJL/ELK

Updated text/Formatted

1.31

June 16, 2011

WJL/ELK

Added current consumption numbers/PN update

1.32

October 3, 2011

WJL

Updated power numbers, changed EMC status, added Time

Mark Pin info

1.35

December 16, 2011

WJL

Added 1Hz, Auto Start, Corrected text on Antenna Bias and

SRESET

1.36

February 9, 2012

DDS

Updated pin diagram, description and ref. schematic

1.38

February 22, 2012

DDS

Removed SRESET from text and reference schematic

1.39

March 8, 2012

DDS

Updated Figure 7 (Mechanical Dimensions)

Added Section 12.3 (Baking, Storage Instructions)

1.4

August 20, 2012

DDS

Added schematic, image and ordering information for USB

Dongle Eval-Board

1.42

October 4, 2012

DDS

Updated power and current consumption values

1.45

April 12, 2013

DDS

Added start-up configuration for baud-rate selection

1.46

May 30, 2013

DDS

Updated Section 2, added Table 3 for Host Interface Options

1.47

June 6, 2013

DDS

Updated part-ordering information

1.48

June 10th, 2013

WJL

Added LNA gain seetings

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

1 General Description

This specification provides a general guideline on the performance and the integration of the

Wi2Wi, Inc. NAVSTAR L1C/A Band, 48 Channel GPS Receiver Module Solution. The solder-

down module, Part Number W2SG0008i is targeted to assist companies to easily integrate GPS

functionally into their products. This is accomplished by reducing their development times and

cost by using a complete, small form factor, low power, ready to integrate GPS Receiver System

Solution.

W2SG0008i is a new and improved GPS solution based on SiRFStarIV™ chip set. The

SiRFStarIV™ platform with SiRFAware™ GPS technology optimizes mobile phones, mobile

computers, and mobile internet devices for location enabled services. Extremely low power

consumption and fast location allows a broad range of location enabled services without

compromising battery life or dependence on a network – from navigating to playing location-

based games to searching for friends at the mall.

Key features of the W2SG0008i are as follows:

 GPS technology based upon SiRFStarIV™ by CSR/SiRF™

 W2SG0008i uses a SiRFStarIV™ Signature Series ROM v2.2

 Compact design for easy integration: 6.75 mm x 6.75 mm x 2 mm

 Fast, Responsive Location Experience

o 48 track verification channels

o SBAS (WAAS, EGNOS, MSAS, GAGAN)

o High Speed acquisition time and high sensitivity GPS Receiver

o High sensitivity navigation engine (PVT) tracks as low as -163dBm

 Breakthrough Power Consumption

o Adaptive micro power controller

o Ultra-low power consumption (Only 50 to 500μA maintains hot start capability)

o 50Ω Antenna Launch

o 48 verification channel GPS receiver

 Reliable in Difficult Environments

o Active Jammer Remover:

 Removes in-band jammers up to 80 dB-Hz

 Tracks up to 8 CW jammers

o SBAS/DGPS (WAAS, ENGOS, MSAS, GAGAN ) support

 Enhanced Navigation

o Smart MEMS sensor interface

o Multi-master I2C bus for smart sensors (Compass, Accelerometer)

o Interrupt input for context change alarms

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

1.1 Pin Definition

The functional pin definition for the W2SG0008i is presented below in Table 1.

Table 1: Pin Definition

GND0

GND

Ground

I2C_CLK

CLK

Dead Reckoning I2C Clock

RTC

Real Time Clock (32.768K Hz)

CTS

I/O

UART CTS

SPI Clock

HS0 PD

GND1

GND

Ground

I2C_DIO

I/O

Dead Reckoning I2C SDA

WAKEUP

Wake up output for control of external memory

GND2

GND

Ground

EIT1

External Interrupt Trigger 1

GND3

GND

Ground

No Connection

GPS_TX

SPI MISO (Default)

UART Transmit

I2C SCL

RTS

SPI nCS (Default)

RTS

HS1 PU

UTC Time Mark Output

ANT_IN

Antenna input; 50 ohm impedance

GPS_RX

UART Receive Input port

SPI MOSI

I2C SDA

ON/OFF

Power State Control Pulse required to wake up device from power on sleep state

EIT2

External Interrupt Trigger 2

GND4

GND

Ground

1V8_IN

PWR

1.8V DC

GND5

GND

Ground (Corner Pad)

GND6

GND

Ground (Corner Pad)

GND7

GND

Ground (Corner Pad)

GND8

GND

Ground (Corner Pad)

* Wi2Wi reserves the right to change the above information.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

1.2 Pin Configuration

The W2SG0008i is a 24 pin SMD device with a board down antenna connection. The pin

configuration is presented below in Figure 1.

Figure 1: Pin Configuration

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

1.3 System Block Diagram

The System Block for the W2SG0008i is presented below in Figure 2.

Figure 2: System Block Diagram

The W2SG0008i provides an internal LNA, all required power regulation, and clocking. The

TTL UART Interface is accessed via Pin 12 and 16.

1.4 Power Supply Considerations

The W2SG0008i must be powered from a single 1.8V supply. The W2SG0008i does not support

operation with separate voltage supply sources to different sections of the module. Customer

designs with split voltage supply sources (for example, one for battery back-up supply and one

for main current load), can be met by using a diode bridge combining the different sources into

a single 1.8V supply to the W2SG0008i. The high current supply source can be enabled by the

WAKEUP output pin; the low current back-up supply battery can be connected to one of the

diode inputs. The supply controlled by WAKEUP must provide full power within 100 µS of

being enabled to prevent high current draw from the back-up source.

2 Specifications

2.1 Clock Frequency

The W2SG0008i features an internal clock and crystal and requires no external clock sources.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Absolute Maximum Ratings:

The values presented below in Table 2 are those parameters beyond which permanent damage

could result. These values do not imply functional operation and should be considered as stress

ratings only.

Table 2: Absolute Maximum Ratings

Parameter

Symbol

Rating

Units

Input Voltage

VDD

5.5

RF Input

RFIN

dBm

Case Temperature

TCASE

°C

Lead Temperature (Soldering, 10sec)

TMFG

260

°C

Operating Temperature Range

-40 to +85

°C

Storage Temperature Range

NA to +150

°C

2.2 Interfaces

Table 3 below shows the pin configuration for GPIO6 / CTS (Pin 4) and GPIO 7 / RTS (Pin 13)

for the selection of host interfaces.

Table 3: Host Interface Selection

Host Interface

GPIO6 / CTS (Pin 4)

GPIO7 / RTS (Pin 13)

UART

High

Slave SPI

Low

High

RESERVED

High

Low

Multi-master I2C

Low

2.2.1 Host UART Interface

The TTL UART Interface (Pins 12 and 16) has a baud rate 4800 BAUD. Protocol options for the

W2SG0008i are NMEA and OSPTM (SiRF BINARY™).

2.2.2 Host I2C Interface

The TTL I2C Interface (Pins 12 and 16) has a speed range of 400kbps. The default values for the

I2C interface are: Rx: 0x60, Tx: 0x62

Operating mode is multi-master: The Transmit side operates as a master by seizing the I²C bus

when detected idle, the Receive side operates as a slave when another master seizes bus and

transmits to the module address. The I²C module implements the I²C bus standard contention

resolution mechanism.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

2.2.3 Host Slave SPI

The Slave SPI (SSPI) is a 4-wire slave mode SPI port. The highest clock rate for Slave SPI is

6.840320MHz and supports both SPI and Micro wire formats. The transmitter and receiver have

individual firmware-defined 2-byte idle patterns of 0xa7 & 0xb4. SPI detects synchronization

errors and is reset by software.

The 4 SPI pins are:

 SSPI_DO: slave SPI data output (MISO)

 SSPI_DI: slave SPI data input (MOSI)

 SSPI_CLK: slave SPI clock input (CLK)

 SSPI_SS_N: slave SPI chip select (CS#) active low

2.3 Master Mode I

C Interface [Dead Reckoning (DR) I

C Interface]

The W2SG0008i master mode I

C interface provides support for dead reckoning (DR). The

master mode port has 2 pins: I2C_DIO (Pin 6) and I2C_CLK (Pin 2). Both pins are pseudo

open-drain and require pull-up resistors on the external bus.

Dead reckoning applications

support the DR I

C interface. The I

C interface supports required sensor instruments such as

gyros, accelerometers, compasses or other sensors that can operate with an I

C bus. DR I

interface supports common sensor formats (accelerometer, gyro, magnetometer, altimeter, etc.).

Typical data lengths are usually several bytes (command + in/out data).

Standard I

C bus has

a maximum data rate of 400 kbps and a minimum data rate of 100 kbps.

3 Specific Pin Functions

The pins related to special features of the W2SG0008i, which may or may not be used depending

on a customer’s design.

3.1 Baud Rate Selection

I2C_DIO (Pin 6) and I2C_CLK (Pin 2) can be used to configure the W2SG0008i module to

output NMEA at standard baud rates, if you are not using I2C or SPI flash devices on these pins.

Table 4 below lists the settings for I2C_DIO and I2C_CLK to configure the baud rate at start-up.

After start-up, these pins can be released for other purposes.

Table 4: Pin Configuration for Baud Rate Selection at Start-up

I2C_DIO (Pin 6)

I2C_CLK (Pin 2)

Protocol

Baud Rate

High

NMEA

4800

High

Low

NMEA

9600

Low

High

NMEA

38400

Low

OSP

115200

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Note:

This flexibility is not available if any MEMS or non-volatile memory devices are attached

to the auxiliary serial bus. The internal software default baud rate is 4800 when an

EEPROM or SPI flash device is attached, but this can be changed via a CCK patch or an

OSP message.

Failure to tie I2C_DIO and I2C_CLK high or low in the absence of both SPI flash and

EEPROM causes an increase in standby and hibernate current, and also causes the start-

up configuration of the UART to be indeterminate.

3.2 On / Off

After power up, the W2SG0008i is in a hibernate state awaiting a pulse on the On/Off pin to put

it into a fully active state. To enable the W2SG0008i a positive pulse for two RTC ticks (62uS)

must be applied. To place the module back into a hibernate state, the same pulse needs to be

applied to the On/Off signal after the Receiver has stabilized after a Fix (Stabilization can be up

to 18 minutes depending on weather conditions). This can be verified with a message ID 18,

called “OK to Send”, that comes out when the receiver is receptive to commands. Figure 3

shows the internal state power up sequence of the SiRFStarIV™ inside the W2SG0008i, many of

the signals listed are not accessible outside of the module, they are provided as reference only.

Figure 3: Power on Sequence

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

3.3 Wake Up

The WAKEUP pin is an output from the W2SG0008i used to enable an external PMIC (Power

Management Integrated Circuit). A low on this output indicates that the W2SG0008i is in one of

its low-power states (Hibernate or Standby mode) and requires no more than 60 µA of current on

the 1.8V power rail. A high on this output indicates that the W2SG0008i is in operational mode

requiring an external regulator to provide enough current for normal operation of the W2SG0008i

module.

3.4

External Interrupts (EIT1 & EIT2)

The EIT1 and EIT2 are external, level sensitive interrupts to the Modules internal ARM processor

via the interrupt controller module. The EIT2 pin is also configurable as an edge-sensitive input.

EIT is disabled at power-on hardware reset, and EIT2 is enabled as an input at power-on

hardware reset.

Either pin can be used as a source of a level sensitive interrupt to wake-up the W2SG0008i from

Standby and Hibernate low-power modes. This function allows external sensors, e.g. gyro,

accelerometer, compass, etc., to provide an interrupt when a change of state is detected.

Either pin can be used as an interrupt source for the module.

3.5 Time Mark (TM)

The Time Mark pin [14] functions as follows: the Time Mark output provides a one pulse-per

second (1pps) signal to the customer’s application processor. When the receiver provides a valid

navigation solution which consists of five satellite vehicles, the rising edge of each TMARK

pulse is synchronized with the UTC one second epochs to within ±1 microsecond. The receiver

software produces a binary format data message containing the UTC time associated with each

time mark pulse. This signal is a positive logic, buffered CMOS level output pulse that

transitions from a logic “low” condition to logic “high” at a 1 Hz rate. The TMARK output pulse

rise time is typically less than 2 nanoseconds and the pulse duration is typically 200

milliseconds.

Patch Option:

A patch exists that allows the Time Mark to output the 1 PPS with only four satellite vehicles

instead of the default of five satellites. This patch can be downloaded from the Wi2Wi Extranet

and implemented with the GPS patch manager that will run on Windows 7 and Linux operating

systems. Please register at www.wi2wi.com to download from the extranet site.

3.6 Auto Start Feature

It has been determined that by connecting the Wake-Up Pin [7] to the On/Off Pin [17] will

automatically turn on the part upon power up. This will enable the customer to Auto enable or

Auto Wake up the part. To put the part into sleep would require that this connection not be made

and that a positive going pulse is initiated to put the part into a hibernate state.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

4 WAAS with SBAS or Wide Area Differential GPS

4.1 Differential GPS

Differential GPS (DGPS) is traditionally used with the fix of three to four satellites and the

secondary fix from ground based GPS receiver based stations that retransmit the secondary fix

via VHF/UHF and occasionally FM. DGPS can achieve positional accuracies of between 60 cm

~ 10 cm/s. See Figure 4.

Figure 4: Traditional DGPS System

DGPS requires at least two antennas, one for the NavStar L1 CA signal from the satellite and one

antenna for the secondary fix from the VHF/UHF/FM transmitter. Also a secondary application

processor is used to perform “Mixing” calculations between the two fixes. This increases the size

and the expenses of the system.

4.2 Wide Area DGPS or WAAS

Wide Area DGPS or WAAS (Wide Area Augmentation System) uses the same concept but

eliminates the need for the secondary RF signal. It accomplishes this by reusing the already

orbiting satellites to re-broadcast other secondary fixes that have been established by ground

based master stations in North America and Hawaii, to measure small variations in the GPS

satellites' signals in the western Hemisphere. Measurements from the reference stations are

routed to master stations, which queue the received Deviation Correction (DC) and send the

correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or

better). These master stations rebroadcast the secondary fix to the NavStar satellites which

broadcast the secondary fix on unused channel space. This enables a GPS receiver to utilize the

same antenna to reprocess both fixes internal to it also eliminating the need for a secondary

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

application processor. WAAS enables a GPS receiver to provide positional accuracy to 300 cm ~

200 cm. Of course a GPS receiver utilizing WAAS will need an expanded offering of GPS

receiver channels to effective use this feature like the W2SG0008i which has 48 channels

available for this function.

As noted this system was originally developed for the U.S. and Northern Hemisphere

Geography. As GPS became ubiquitous in technology use throughout the world, similar systems

called generically as Satellite-Based Augmentation System (SBAS). A SBAS is a system that

supports wide-area or regional augmentation through the use of additional satellite-broadcast

messages. Such systems are commonly composed of multiple ground stations, located at

accurately-surveyed points. The ground stations take measurements of one or more of the GNSS

satellites, the satellite signals, or other environmental factors which may impact the signal

received by the users. Using these measurements, information messages are created and sent to

one or more satellites for broadcast to the end users.

While SBAS designs and implementations may vary widely, with SBAS being a general

term referring to any such satellite-based augmentation system, under the International Civil

Aviation Organization (ICAO) rules a SBAS must transmit a specific message format and

frequency which matches the design of the United State’s Wide Area Augmentation System.

Figure 5: SBAS Example System

Some examples of these are (GPS Aided GEO Augmented Navigation) GAGAN

developed for the Indian Sub-Continent, European Geostationary Navigation Overlay Service

(EGNOS) developed for the European Union, and the Japanese Multi-functional Satellite

Augmentation System (MSAS), respectively.

4.3 How do we enable WAAS-SBAS on the W2SG0008?

WAAS-SBAS is enabled by issuing Message ID 133, (MID 133) is supported in One Socket

Protocol (Formerly SiRF™ Binary Protocol mode), and then the accuracy improves to 300 cm ~

100 cm with it enabled, depending on Open Sky Conditions (Multi-Path interference). With MID

133 not enabled, the accuracy is near 1500 cm.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

5 Electrical/RF Characteristics: Operating

Table 5 below presents the normal limits of operation for the W2SG0008i. Operations of the W2SG0008i

beyond the limits of these tables are not recommended and may result in permanent damage of the device.

Unless otherwise specified, operating conditions are over TA = -30°C to +85°C. Typical is defined as TA =

+25°C.

Table 5: Operating Electrical Characteristics

Parameter1

Symbol

Min.

Typ.

Max.

Units

Power Supply (VCC)

Power Supply Voltage

VCC

1.71

1.80

1.89

I/O Supply Voltage

VIO

1.71

1.80

1.89

Power Supply Ripple

VRIP

100

I/O Input Current

IIO

1.5

2.0

Current Consumption (ICC)

Acquisition Mode Current

ICC_ACQ

Tracking Mode Current

ICC_TR

Power Save Mode Current

ICC_PS

µA

UART Interface (TX, RX)

Input Pin Voltage

VRX

1.8

3.6

Output Pin Voltage

VTX

1.8

GPS Enable (GPS_ON/OFF)

Input Pin Low Voltage

VIL

0.45

Input Pin High Voltage

VIH

1.35

1.8

3.6

RF Input

Input Impedance

RANT

Ω

Operating Frequency

FOPR

1.575

GHz

RF Characteristics

Power In @1.5745 GHz

-157

-131

-10

dBm

Noise Figure

3.0

Input IP2 (ƒ1=849MHz, ƒ2=2424MHz) -30dBm in

IIP2

-.5

dBm

Input IP3 (ƒ1=1574.5MHz, ƒ2=1575.5MHz)

-30dBm in

IIP3

-2

dBm

Input Return Loss

RLIN

-10.0

Input VWR

VWRIN

1.50:1

1.8:1

Reverse Isolation

ISL

-28

Stability (100 -10000 MHz)

Receiver Sensitivity:

•Signal Acquisition @ 31dBHz

PACQ

-148

dBm

•Signal Tracking

PTR

-163

dBm

Notes:

1 All parameters are at TA = 25C°, unless otherwise specified.

2 Defined as peak current drawn during initial acquisition operation of GPS Receiver.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

6 Performance

6.1 Acquisition Time

The average Time to First Fix (TTFF) for the W2SG0008i when integrated with the

W2SG0008i-DEV Development System is presented in Table 6 below:

Table 6: Average Time to First Fix

Parameter1

Symbol

Min

Typ.

Max.

Units

Hot Start – Typ. Signal @ -140 dBm

TTFFTYP

0.7

<1.0

Hot Start – Low Signal @ - 146 dBm

TTFFLOW

1.0

Hot Start – Weak Signal@ - 150 dBm

TTFFWEAK

2.0

Cold Start @ -130 dBm

TTFFCLD

Cold Start @ -140 dBm

TTFFCLD

Cold Start @ -146 dBm

TTFFCLD

Cold Start @ -150 dBm

TTFFCLD

Notes:

1 Stationary receiver, unless otherwise specified.

2 All parameters are at TA = 25°C, unless otherwise specified.

6.2 Position Accuracy (3-D NAV)

Table 7 below presents the Positional Accuracy for the W2SG0008i when integrated with the

W2SG0008i-DEV Development System.

Table 7: Positional Accuracy

Parameter1

Typ.

Units

Horizontal Position Accuracy: CEP (50%)

2.5

Horizontal Position Accuracy: 2dRMS (95%)

Vertical Position Accuracy: CEP (50%)

Vertical Position Accuracy: 2dRMS (95%)

Horizontal Velocity Accuracy: Deviation

0.01

m/s

Vertical Velocity Accuracy: Deviation

0.4

m/s

Notes:

1 Stationary receiver, Open Sky at -130dBm, unless otherwise specified.

2 All parameters are at TA = 25°C, unless otherwise specified.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

6.3 Environmental Characteristics

Table 8 establishes the environmental limits for operational use of the W2SG0008i.

Table 8: Environmental Characteristics

Parameter

Symbol

Min

Typ.

Max.

Units

Storage Temperature

TSTR

+150

C°

Operating Temperature

TOPR

-40

+25

+85

C°

Humidity

%/Non-condensing

Altitude

60,000/18,288

ft/m

Acceleration

6.0

Velocity

<1,000

knots

6.4 Current and Power Consumption

Table 9 shows the current and power consumption values in different modes of operation for

W2SG0008i.

Table 9: Current and Power Consumption

Mode of Operation

Current

Unit

Power @ 1.8V

Unit

Typ

Max

Typ

Max

Acquisition Mode

50.5

63.5

90.9

114.3

Tracking Mode

33.5

48.5

60.3

87.3

Hibernate Mode /

Power Save Mode

10.5

14.5

µA

18.9

26.1

µW

6.4.1 Internal LNA Gain

The W2SG008i is provided with an internal LNA amplifier with two selectable gain levels.

In general, the high gain mode is intended for use with passive antennas, while the low gain

mode is used when there is an external LNA as part of the RF front end (e.g. active antenna).

By default the internal LNA amplifier is configured in high gain mode.

When an active antenna with an external LNA has to be used, the internal LNA amplifier

must be configured in low gain mode.

To change to Low Gain mode, please review the following steps:

1) Switch GPS Communication Protocol from NMEA to OSP mode

2) Send Tracker Configuration Message (OSP MID178,02) - (Disable Internal LNA and drive

GPS_EXT-LNA_EN signal):

A0 A2 00 39 B2 02 00 F9 C5 68 03 FF 00 00 0B B8 00 01 77 FA 01 01 03 FC 03 FC 00 7D

00 00 00 00 00 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E1 00 00 00 62 00 60 01 01 01

F4 2A 01 0B 5A B0 B3

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

3) Wait for SiRF StarIV Ack: A0 A2 00 03 0B B2 00 00 BD B0 B3

4) Tracker configuration setting requests in message (OSP 178, 02) will apply after the next reset.

5) Perform a Hot Start reset

Wait for SiRF StarIV Ack: A0 A2 00 03 0B 80 00 00 8B B0 B3

6) Switch GPS Communication Protocol back to NMEA

6.4.1.1 Maximum Antenna Gain

 In high gain mode, a passive antenna acts as input. Total RF gain (sum of internal LNA

gain, cable and filter losses) of ≤ 5 dB is considered acceptable.

 In low gain mode, an active antenna acts as input. Total RF gain (sum of external antenna

gain, internal LNA gain, cable and filter losses) of 14 to 24 dB is considered acceptable.

7 Antenna

The W2SG0008i is designed to work with a passive or an active antenna. The GPS module

incorporates an integrated LNA and it will work with either an active or a passive antenna.

For W2SG0008i Evaluation Kit, the selection of antenna is based on the following configuration:

 Onboard Passive Chip Antenna: JP1 open, R15 open, R16 connected

 External Active Antenna: JP1 connected, R15 connected, R16 open

W2SG0008i EVK-1 consists of both, onboard passive chip antenna and external active antenna;

while W2SG0008i EVK-2 consists of only onboard passive chip antenna.

8 Normal Mode of Operation

Figure 6 shows the normal mode of operation of W2SG0008i.

Figure 6: Normal Mode of Operation (USB Dongle Reference Schematic)

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Note: Antenna selection is based on the following configuration:

 Onboard Passive Chip Antenna: JP1 open, R15 open, R16 connected

 External Active Antenna: JP1 connected, R15 connected, R16 open

9 Development Support

The W2SG0008i device is embedded with GPS software. This software is optimized to work in

very weak signal environments to improve navigation availability and accuracy.

To enable GPS performance testing, Wi2Wi provides a W2SG0008i GPS Evaluation board,

along with the SiRFLive software. SiRFLive is a PC tool that provides real-time monitoring of

an attached GPS receiver’s operation such as satellites being tracked, observed signal strength,

and current position.

10 Mechanical Information

10.1 Mechanical Specification

The overall dimensions of the W2SG0008i are 6.75 mm x 6.75 mm x 2 mm. The module

includes a shield. The general dimensions of the module are presented in Figure 7. The module is

a Surface Mount Device (SMD). The measurements in Figure 7 are in mm, and are not to scale.

Figure 7: Mechanical Dimensions

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Note: Refer to Ordering Information in Section 11.

 YY indicates Year

 WW indicates Work Week

 X indicates ROM version (e.g. B = ROM v2.2)

10.2 Storage and Baking Instructions

A W2SG0008i is an MSL4 qualified package. After opening the bag, the parts should be:

a. Stored as per J-STD-033 standard.

b. Mounted within 72 hours of factory conditions (≤ 30°C, 60% RH)

If the parts have been exposed in transit, they should be baked per J-STD-033 standard for 24

hours at 125°C.

10.3 Recommended Reflow Profile

Assembly Guidelines:

1. Follow solder paste manufacturers recommended profile

a. All RoHS solder pastes contain the same basic chemistry; however, each manufacturer

may have a recommended reflow profile that performs best for their product.

2. The profile illustrated in JESD-020 and below is for reference only.

a. There is no one profile that fits all scenarios.

3. Profiles must be dialed in to the specific assembly type.

4. ENIG finishes are more susceptible to voids and air entrapment.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

a. Selecting a RoHS solder paste that is “ENIG” compatible is recommended.

5. Recommended finishes for LGA/BGA inclusive assemblies include HASL, OSP, Tin, &

Silver.

Figure 8: Recommended Reflow Profile

Key features of the profile in Figure 8:

 Initial Ramp = 1 to 2.5°C/Sec to 175°C +/- 25°C equilibrium

 Equilibrium = 60 to 180 seconds

 Ramp to Maximum (Peak) temperature (245°C) = 3°C/sec max.

 Time above liquidus temperature (217°C): 45-90 seconds

11 Ordering Information

Table 10: Ordering Information

Part Order Number

Description

Packing Method

W2SG0008i-B-T

Baud Rate = 4800 bps

Tray

W2SG0008i EVK-1

USB Dongle with Integrated Passive Chip Antenna

and External Active Antenna

Box

W2SG0008i EVK-2

USB Dongle with Integrated Passive Chip Antenna

Box

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

11.1 Evaluation Kits

 W2SG0008i EVK-1: W2SG0008i USB Dongle Evaluation Kit with Active Antenna

This kit is designed to provide a quick evaluation with the customer’s host processor. It

includes a USB Dongle with W2SG0008i module, onboard passive chip antenna, an

external active antenna and an evaluation CD with Application Notes, Datasheet, Product

Brief, Schematic, Quick Start Guide, SiRFLive software and other supporting documents.

 W2SG0008i EVK-2: W2SG0008i USB Dongle Evaluation Kit with Integrated Antenna

This kit is designed to provide a quick evaluation with the customer’s host processor. It

includes a USB Dongle with W2SG0008i module, onboard passive chip antenna and an

evaluation CD with Application Notes, Datasheet, Product Brief, Schematic, Quick Start

Guide, SiRFLive software and other supporting documents.

Figure 9: W2SG0008i Module on USB Dongle Evaluation Board

12 Disclaimers

Wi2Wi, Inc. PRODUCTS ARE NOT AUTHORISED FOR USE AS CRITICAL

COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS

WRITTEN APPROVAL OF THE MANAGING DIRECTOR OF Wi2Wi, Inc.

The definitions used herein are:

a) Life support devices or systems are devices which (1) are intended for surgical implant into

the body, or (2) support or sustain life and whose failure to perform when properly used in

accordance with the instructions for use provided in the labeling can reasonably be expected to

result in a significant injury to the user. b) A critical component is any component of a life

support device or system whose failure to perform can be reasonably expected to cause the

failure of the life support device or system, or to affect its safety or effectiveness.

Wi2Wi, Inc. Doc No. ALT-PDT-DOC Rev.1.48

Data sheet, GPS Module - W2SG0008i

June 10th, 2013

Wi2Wi does not assume responsibility for use of any of the circuitry described, no circuit patent

licenses are implied and Wi2Wi reserves the right at any time to change without notice said

circuitry and specifications.

12.1 Datasheet Status

Wi2Wi, Inc. reserves the right to change the specification without prior notice in order to

improve the design and supply the best possible product. Updated information, firmware and

release notes will be made available on www.wi2wi.com. Please check with Wi2Wi Inc. for the

most recent data before initiating or completing a design.

13 Certifications

The W2SG0008i conforms to the following standards when integrated to the Evaluation Kit.

EMC/Immunity

 FCC Part 15 Chapter B (USA)

 IC Canada (Canada)

 CE Mark (Europe)

14 References

14.1 Specifications

 System Specification, SiRFStarIV™ GSD4e BGA, Issue 5

 NMEA 0183 Version 3.01, January 2002, Addendum NMEA 0183-HS Version 1.0

 OSP Issue 9

 FAA WAAS Specification FAA-E 2892b

14.2 Trademarks, Patents and Licenses

 Trademarks: SiRF, SiRF logo, SiRFStar, are trademarks of SiRF Technology, Inc.

 Licenses: Software and firmware license from CSR/SiRF™

Mouser Electronics

Authorized Distributor

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