S100 Slave - GPS U-Blox SAM-M8Q

Overview

The S100 Slave - GPS U-Blox SAM-M8Q v1.1 is a certified Rhomb.io Slave module that contains an antenna module. It also includes an accelerometer/magnetometer. The antenna module included in this Rhomb.io Slave Module is designed to receive and track the L1C/a signals provided at 1575.42 MHz by the Global Positioning System (GPS). Like every Rhomb.io Slave Module, it can be controlled by the Rhomb.io Masters.

TOP VIEW:


GPS Module 3DTOP.JPG


BOTTOM VIEW:

GPS Module 3DBOT.JPG



Applications

  • Point-of-sale (POS)
  • loT
  • Smart energy gateways
  • Industrial and consumer applications that require small, cost efficient, and ready-to-use GNSS solutions.

Module specification

Key Features

The table below shows the main features of the S100 Slave - GPS U-Blox SAM-M8Q v1.1:

GPS Antenna Module Features
GPS Antenna Module SAM-M8Q GNSS
Category Standard Precision GNSS
GNSS GPS/GZSS ; GLONASS ; Galileo
Interfaces UART; I2C
Operating voltage 2.7 - 3.6 V
Others Additional SAW
Additional LNA
RTC Crystal
Built-in-antenna
1 Timepulse
Accelerometer/Magnetometer Features
Accelerometer/Magnetometer FXOS8700CQ
Sensor 6-axis sensor
Supply Voltage 1.95 V to 3.6 V (VDD) // 1.62V to 3.6V (VDDIO)
Output Data Rates From 1.563 Hz to 800 Hz for each sensor
Acceleration Measurements Resolution 14-bit ADC
Magnetic Measurements Resolution 16-bit ADC
Power Consumption 240uA at 100Hz / 80uA at 25 Hz (both sensors active)

SAM-M8Q GNSS

The SAM-M8Q GNSS benefits from the exceptional performance of the u-blox M8 multi-GNSS engine. The SAM-M8Q GNSS offers high sensivity and minimal acquisition times in an ultra compact form factor.

The SAM-M8Q GNSS uses concurrent reception of up to three GNSS systems (GPS/Galileo and GLONASS), it recognizes multiple constellations simultaneously and provides outsanding positioning accuracy in scenarios where urban canyon or weak signals are involved.

It also supports augmentation of QZSSm GAGAN and IMES together with WAAS, EGNOS, MSAS. The 15 x 15 mm patch antenna provides the best compromise between the performance of a Right Hand circular Polarized (RHCP) anntena and a small size to be integrated in any design.

This device pin mapping is the next:

PIN MAPPING GPS.JPG

PIN MAPPING DESCRIPTION GPS.JPG

POWER

Regarding the power supply, the device has several different power supply pins:

In the S100 Slave - GPS U-Blox SAM-M8Q v1.1 the power source comes from the Rhomb.io module connectors. The source used is DVCC. To supply "DVCC", we can use "3V3" or "2V8". Each power source is connected by a solder jumper so you can choose "DVCC" by soldering one of the solder jumpers,"3V3" or "2V8". By default the solder jumper of the 3V3 power source is soldered.

The second Power source is VIO_IN, it comes from the Rhomb.io Module connectors too. VIO_IN is the Voltage Power source that comes from the Master. It depends on the Voltage of the Master.

BLOCK DIAGRAM

The next figure shows the Block Diagram for the S100 Slave - GPS U-Blox SAM-M8Q v1.1.

GPS Module BlockDiagram.JPG

Solder Jumpers

There are two Solder Jumpers used to choose the power source for "DVCC", as it was mentioned before. There are three options :

-"2V8"(SJ2)

-"3V3"(SJ1)

As we can see in the image below:


GPS Module SJ.JPG


ID Memory

The DS28E05 is a 112-byte user-programmable EEPROM organized as 7 pages of 16 bytes each. Memory pages can be individually set to write protected or EPROM emulation mode through protection byte settings. Each part has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip.

Applications:

  • Accessory/PCB Identification
  • Medical Sensor Calibration Data Storage
  • Analog Sensor Calibration
  • Aftermarket Management of consumables

Features:

  • Single-contact 1-Wire Interface
  • 112 Bytes User EEPROM with 1k Write Cycles
  • Programmable Write Protection and OTP EPROM Emulation Modes for User Memory
  • Unique Factory-Programmed 64-Bit ROM ID Number
  • Operating Range: 1.71V to 3.63V, -40ºC to +85ºC

The configuration is shown in the next image:
S200 Master Module - Kinetis K8x IDMEMORY.JPG

Connections

GPIO

The following table summarizes the GPIOs used on the S200 Master Module - Kinetis K81 v2.0. It is also indicated the possible functions that these GPIOs are able to have.

Rhomb.io pinout Signal Module Signal Functions Device Pin
GPIO-A IO0 IO0 RST Accel/Magnet 16
IO1 IO1 INT2 Accel/Magnet 9
IO2 IO2 EXTINT GPS 19
IO3 IO3 TIMEPULSE GPS 7

Serial interfaces

The following table indicates the available serial interfaces on the Rhomb.io standard and which of them are in use. The table also shows the nomenclature used on the Rhomb.io standard for auxiliary connections and its corresponding on the schematic.

Signal (Rhomb.io) Signal (module) Used by Pin
I2C-A
I2C-A_SDA I2C-A_SDA Accelerometer/magnetometer & GPS A/M(Pin 6) & GPS(Pin 9)
I2C-A_SCL I2C-A_SCL Accelerometer/magnetometer & GPS A/M(Pin 7) & GPS(Pin 12)
UART-A
UART-A_RXD UART-A_RXD GPS Pin 14
UART-A_TXD UART-A_TXD GPS Pin 13

The I2C pull-ups resistors (4K7) are mounted on the Rhomb.io Motherboards. For more details, look at the module specifications for the Rhomb.io standard.

OTHER INTERFACEs

Signal (Rhomb.io) Signal (module) Function Used by Pin
INT INT0 Interruption Accelerometer/magnetometer Pin 11
RESET #RESET_IN RESET_N GPS Pin 18
1WIRE 1WIRE Security signal ID Memory Pin A2 & B2

Power

As per the supply lines used on the board, there is a summary on the next table.

Signal (Rhomb.io) Signal (module) Voltage (V) Used
1V8 150mA 1V8 1.8 No
2V8 150mA 2V8 2.8 Selectable
3V3 3V3 3.3 Selectable(Default)
5V_USB USB/OTG 5 No
VSYS VSYS 3 - 5.5 No
VBAT VBAT VBAT No


Mechanical specifications

GPS ALL.jpg

Warranty

  • Precaution against Electrostatic Discharge. When handling Rhomb.io products, ensure that the environment is protected against static electricity. Follow the next recommendations:
  1. The users should wear anti-static clothing and use earth band when manipulating the device.
  2. All objects that come in direct contact with devices should be made of materials that do not produce static electricity that would cause damage.
  3. Equipment and work table must be earthed.
  4. Ionizer is recommended to remove electron charge.
  • Contamination. Be sure to use semiconductor products in the environment that may not be exposed to dust or dirt adhesion.
  • Temperature/Humidity. Semiconductor devices are sensitive to environment temperature and humidity. High temperature or humidity may deteriorate semiconductor devices characteristics. Therefore avoid storage or usage in such conditions.
  • Mechanical Shock. Care should be exercised not to apply excessive mechanical shock or force on the connectors and semiconductors devices.
  • Chemical. Do not expose semiconductor device to chemical because reaction to chemical may cause deterioration of device characteristics.
  • Light Protection. In case of non-EMC (Epoxy Molding Compound) package, do not expose semiconductor IC to strong light. It may cause devices malfunction. Some special products which utilize the light or have security function are excepted from this specification.
  • Radioactive, Cosmic and X-ray. Semiconductor devices can be influenced by radioactive, cosmic ray or X-ray. Radioactive, cosmic and X-ray may cause soft error during device operation. Therefore semiconductor devices must be shielded under environment that may be exposed to radioactive, cosmic ray or X-ray.
  • EMS (Electromagnetic Susceptibility). Note that semiconductor devices characteristics may be affected by strong electromagnetic waves or magnetic field during operation.

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