ISM420-INT

Confidential Inventek Systems, LLC. Revision 1.1.1 Inventek Systems User Manuel OEM GPS Module Interposer Part No. ISM420-INT – Rev A Page 1 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 Table of Contents 1 2 GENERAL DESCRIPTION ...................................................................................... 3 PART NUMBER DETAIL DESCRIPTION .............................................................. 3 Ordering Information................................................................................................. 3 3 GENERAL FEATURES ............................................................................................. 4 3.1 Flexible Power Control ....................................................................................... 4 4 COMPLIMENTARY DOCUMENTATION ............................................................. 4 4.1 Inventek Systems ................................................................................................ 4 5 Schematic .................................................................................................................... 5 5.1 Module Architecture ........................................................................................... 5 5.2 Hardware Features .............................................................................................. 6 5.3 Recommended Antenna Specifications .............................................................. 6 6 HARDWARE ELECTRICAL SPECIFICATIONS ................................................... 6 6.1 Power Supply Maximum Ratings ....................................................................... 6 6.1.1 Detailed Pin Description ................................................................................. 6 7 BASIC OPERATION (SPI/UART or I2C) ................................................................. 8 8 SOFTWARE INTERFACE ........................................................................................ 9 8.1 NMEA input and output messages ..................................................................... 9 8.2 SiRF Binary Protocol .......................................................................................... 9 9 Product Compliance Considerations ........................................................................... 9 10 ORDERING INFORMATION ................................................................................. 10 11 REVISION CONTROL ............................................................................................ 10 12 CONTACT INFORMATION................................................................................... 10 Page 2 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 1 GENERAL DESCRIPTION This specification is a description of the Interposer board for the ISM420 SiRF IV ROM based GPS module. This board was designed specifically for a simple and low cost method to evaluate the RF performance of the ISM420 and become familiar with the various interfaces and how to control the GPS modue. For detailed specifications on the ISM420 please see the functional specification on the www.inventeksys.com The Inventek ISM420 is a 48 channel global positioning system (GPS) receiver in a very compact Surface Mount Device (SMD) GPS module with high sensitivity, high gain, and low power. The small form factor GP receiver is designed for a broad spectrum of OEM applications and is based on the fast and deep GPS signal search capabilities of CSR , SiRFstarIV™ architecture. Several key features about this interposer are: 20 pin DIP socket – 100 mil on center 1.8 Volts Ipex or Hroshi U.FL connector for an external antenna. No external EE on board Setup to be defaulted in NMEA-0182, 4800 baud, 1, N 2 PART NUMBER DETAIL DESCRIPTION Ordering Information Device ISM420INT Description Interposer Board, DIP,UART, ISM420 Page 3 of 10 Ordering Number ISM420R-INT Confidential Inventek Systems, LLC. Revision 1.1.1 3 GENERAL FEATURES • • • • • • • • • 3.1 Based on the high performance features of the SiRFstar IV, GSD4e ROM processor. High sensitivity navigation engine (PVT) tracks as low as -163dBm 48 track verification channels NMEA-0183, or OSP SiRF binary output Integrated LNA, SAW Filter, TCXO and RTC Inputs (only) +3.3 V tolerant Single power supply voltage 1.8V. Lead Free Design which is compliant with ROHS requirements 50 Ohm antenna input Flexible Power Control For embedded applications that will be using NMEA OR SiRF protocol, it is possible to control the state of ISM420 by simply toggling the ON/OFF pin (4). This permits the user to save considerable battery energy by keeping the module in the lowest possible energy state where it consumes less than 10uA. When a satellite fix is required simply toggling the ON/OFF pin (4) puts the module back into full power. If the last fix was less than 2 hours ago, the ISM420 will do a hot fix and be able to get a fix in one second in open sky environment. Then the users circuit can toggle the ON/OFF pin (4) again to put the module into the hibernate state. No external battery backup circuits required. An application requiring location information every minute will save over 98% on the power consumption depending upon frequency of updates. For portable applications, such as in a laptop, that do not have easy access to the actual module pins, the same can be accomplished by send a command via the SiRF binary port to either wake up the module or put the module into hibernate state. 4 COMPLIMENTARY DOCUMENTATION 4.1 Inventek Systems SiRF Binary Protocol Reference Manual OSP Reference Manual NMEA Reference Manual SiRF Live Demo Software Page 4 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 5 Schematic 5.1 Module Architecture Figure 1 Inventek’s ISM420-INT General Block Diagram Page 5 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 5.2 Hardware Features The ISM420-INT is a complete navigation GPS processor built on a low power SiRF IV GSD4e processor. The module has an ARM7 processor and RF front end with integrated LAN and SAW to complete a standalone or Aided-GPS engine. The user is only able to select the output to the host to be UART for the Rev A board, future designs will support I2C or SPI. Yu will be able to boot strap the device to come in any of the above modes. The default output is a UART outputting, NMEA-0183 at 4800 baud. It is recommended you connect an external Flash memory to the ISM420 to allow for both ROM patch space for any future ROM fixes and also this is where the ISM420 will store client generated extended ephemeris. The client generated extended ephemeris allows for quick TTFF and can save significant battery power as well as allow for smaller GPS antenna designs. ROM based Autonomous by simply toggling the ON/OFF pin (4). This permits the user to save considerable battery energy by keeping the module in the lowest 5.3 Recommended Antenna Specifications ISM420R1-CX module is designed for use with an active or passive antenna. 6 HARDWARE ELECTRICAL SPECIFICATIONS 6.1 Power Supply Maximum Ratings Parameter Input voltage Current (avg) at full power (1.8V) ISM420 Module 1.8 VDC 45 mA 6.1.1 Detailed Pin Description J1 – Pin 9,10 – Connect to Ground J2 - Pin 20 – Connect to 1.8 V RTC in: Do not connect. J2 – Pin 16 – to a momentary switch to 1.8V to turn on GPS Page 6 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 J2- Pin 15 – Rx- UART_RX UART data receive J2 – Pin 12 – Tx - UART_TX UART data transmit Wakeup: This is an output that indicates the state of the GPS. Low is hibernate and high is active.Wake up can be used to control / enable external devices. RF-in RF IN from antenna If you want to have your own external RF Connector uses the following guidelines. * Make sure to use a standard 50 ohm SMA or similar connection. Please note – care should be taken when laying out the RF IN on your PCB as it is a 50 ohm transmission line. This will match the impedance of the connector pin for minimal transmission loss. Care should be taken to not place switching circuits in close proximity to this trace. Reset - Do not connect Pin 18 ON_OFF (input) The input level is 1.8V level direct hardware connection to the internal Finite State Machine. The RTC clock must be on and standby for this control to be functional. Minimum on pulse duration is two RTC ticks, about 63us. Minimum inter-pulse interval is one second. Minimum off duration is two RTC ticks, about 63us. See Figure below give a guideline for pulse waveform. A critical item to avoid is contact bounce if mechanical switch are used. EIT Do not connect EIT Pull to ground V In Input Voltage, 1.8 V and add minimize ripple VDDQ_0 Pull down if not used Page 7 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 ECLK – Do not connect 7 BASIC OPERATION (SPI/UART or I2C) The ISM420 has three outputs to the host, SPI, I2C and UART. All ports are multiplexed on a shared set of pins. At system reset, the host port pins are disabled, so no conflict occurs. At system reset, you can boot strap the device as follows: Port Type Pin 16 Pin 15 UART 1( External pull-up) 1(internal pull-up) SPI (Default) 0 (internal pull-down) 1 (internal pull-up) I2C 0 (Add a pull down) 0 ( Add a pull-down) The host ports are configured based on these straps. The software sets up the port pins requirements during low power modes. UART Mode Port Type UART Mode 16 1( External Pull up) 15 Do no connect The ISM420 will output NMEA-0183, 4800 baud, 8-N-1. The transmit and receive channel contain a 64B FIFO. • TX is GPS output • RX used for GPS control • nCTS and nRTS are optionally used for hardware flow control. Through this UART connection, your host microcontroller can change the baud rate, change the output to OSP ( SiRF Binary) or enable or disable many features of the ISM420. Outputs are LVCMOS 1.8V compatible. SPI Mode Port Type SPI Mode Pin 16 Do no connect Pin 15 Do no connect The host interface SPI is a slave mode SPI. • MOSI,MISO,nCS and SCLK • • Transmit and Receive have independent 1024B FIFO buffers. An interrupt is provided when the transmit FIFO and outpu serial register are both empty. Page 8 of 10 Confidential Inventek Systems, LLC. • • Revision 1.1.1 The transmit and receive have individual software defined 2-byte idle patterns of 0xa7 0xb4. Max clock of 6.8Mhz I2C Mode Port Type SPI Mode Pin 16 0 (Add a pull down) Pin 15 0 (Add a pull down) The host interface I2C mode. • Operation up to 400kbps. • Transmit and Receive have independent FIFO length of 64 bytes. • The default address is o RC: 0x60 o TX: 0x62 • Multi-master I2C mode is default mode 8 SOFTWARE INTERFACE The host serial I/O port of the module’s serial data interface supports full duplex communication between the module and the user. The default serials are shown in Table below: Port Port A Port A Protocol NMEA 0183 OSP(SIRF Binary) Optional Description GGA, GSA, GSV, GLL, RMC, VTG Optional – can send command to switch to OSP. See SiRF OSP Protocol Manual 8.1 NMEA input and output messages A complete description of each message is contained in the SiRF NMEA reference manual. 8.2 SiRF Binary Protocol A complete description of each binary message is contained in the SiRF Binary Protocol reference manual. 9 Product Compliance Considerations Page 9 of 10 Confidential Inventek Systems, LLC. Revision 1.1.1 RoHS: Restriction of Hazardous Substances (RoHS) directive has come into force since 1st July 2006 all electronic products sold in the EU must be free of hazardous materials, such as lead. 10 ORDERING INFORMATION Part number ISM420R1-CT ISM420EVB ISM420INT Description GPS module Evaluation Board Interposer Board Package Temperature Surface Mount Tray -35C- 80 °C UART/SDIO/SPI with antenna DIP format 11 REVISION CONTROL Document : ISM420INT ECO: Release 1 8/23/2010 – Release 1.1.1 Internal GPS Interposer Production release Release : FMT Internal Release 12 CONTACT INFORMATION Inventek Systems 2 Republic Road Billerica Ma, 01862 Tel : 978-667-1962 www.inventeksys.com Inventek Systems reserves the right to make changes without further notice to any products or data herein to improve reliability, function, or design. The information contained within is believed to be accurate and reliable. However Inventek Systems does not assume any liability arising out of the application or use of this information, nor the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. Page 10 of 10