EVA-M8E - Miniature Untethered Dead Reckoning (UDR) Module

The EVA-M8E module introduces u-blox's Untethered Dead Reckoning (UDR) technology in the ultra-compact EVA form factor.

The EVA-M8E module introduces u-blox's Untethered Dead Reckoning (UDR) technology in the ultra-compact EVA form factor. Measuring 7 x 7 mm, EVA offers the designer flexibility in the selection and placement of peripheral components and only requires Flash memory, an inertial sensor, and an optional real-time clock (RTC) crystal. The EVA-M8E's sensor may be installed in any position within the vehicle without configuration.

UDR provides the benefits of Dead Reckoning (DR) without requiring speed information from the vehicle. This significantly reduces the cost of installation for after-market Dead Reckoning applications and brings DR performance to applications where previously only GNSS was possible. The strength of UDR compared with GNSS alone is particularly apparent under poor signal conditions in urban environments, where it brings continuous positioning even to devices with antennas installed within the vehicle. Useful positioning performance is also available during complete signal loss, for example in parking garages and short tunnels. UDR positioning starts as soon aspower is applied to the module, even before the first GNSS fix is available. Inertial sensing enables vehicle yaw, pitch, and roll to be calculated and reported directly.

The intelligent combination of GNSS and sensor measurements enables accurate, real-time positioning at rates up to 20 Hz, as needed, for smooth and responsive interactive applications. Native high-rate sensor data can be relayed to the host for applications such as driving behaviour analysis or accident reconstruction.

The EVA-M8E includes u-blox's latest generation GNSS receiver, which adds Galileo to the multi-constellation reception that already includes GPS, GLONASS, BeiDou and QZSS. The module provides high sensitivity and fast GNSS signal acquisition and tracking. UART, USB, DDC (I²C compliant) and SSI interface options provide flexible connectivity and enable simple integration with most u-blox cellular modules.

Key features:

  • Industry's smallest UDR module form‑factor
  • Leading performance under poor signal conditions
  • Continuous navigation during signal interruptions
  • Independent of any electrical connection to the car
  • Real‑time positioning at rates up to 20 Hz
  • Low cost of ownership, ideal for high volume projects

For sales and technical development support from our in-house engineering team, please contact the Alpha Micro team.

Parameters Specifications
Receiver type

72-channel u-blox M8 engine

GPS/QZSS L1 C/A, GLONASS L10F, BeiDou B1I, Galileo E1B/C


Nav. update rate

Up to 20Hz

Position accuracy

2.0m CEP


Cold starts: 26s

Aided starts: 3s

Re-acquisition: 1s


Tracking & navigation: -160dBm²

Cold starts: -148dBm

Hot starts: -157dBm


AssistNow GNSS Online

AssistNow GNSS Offline (up to 35 days)

AssistNow Autonomous(up to 6 days)

OMA SUPL & 3GPP compliant

Oscillator Crystal
Real Time Clock (RTC)

Can be derived either from onboard GNSS crystal (for lowest system costs and smallest size) or from external RTC Clock

(Default mode, for lower battery current)

SQI Flash


Sensor External DDC gyro/accelerometer required
Supported antennas Active and passive³
Antenna supervision Short and open circuit detection supported with external circuit
Raw data Code phase output
Odometer Integrated in navigation filter

Up to 4 circular areas

GPIO for waking up external CPU

Spoofing detection

Built in

Signal integrity

Signature feature with SHA 256

Data logger (external Flash required)

For position, velocity, time and odometer data

¹ For default mode: GPS/SBAS/QZSS+GLONASS

² Limited by FW for best DR performance

³ An external LNA and SAW recommended for passive antenna applications

Electrical data
Supply voltage 2.7 to 3.6 V
Power consumption

29mA @ 3.0V (Continuous, default concurrent mode)

Backup supply 1.4 to 3.6 V
Serial interfaces



1 SPI (optional)

1 DDC (I²C compliant)

1 SQI interface (for Flash update)

Digital I/O

Configurable timepulse

1 EXTINT input for Wakeup


Configurable 0.25 Hz to 10 MHz

Protocols NMEA,UBX binary, RTCM


43 pin LGA (Land Grid Array): 7.0 x 7.0 x 1.1 mm, 0.13 g

Environmental data, quality & reliability

Operating temperature -40°C to +85°C
Storage temperature -40°C to +105°C
RoHS compliant (lead free) and green (no halogens)
Qualification according to standard JESD47
Moisture sensitivity level 3
Part Number Description Pack Size
EVA-M8E u-blox M8 concurrent GNSS 43-pin LGA module, Untethered Dead Reckoning, crystal, external Flash and sensor, green (Professional grade)
Reel of 500
Support Products
u-blox M8 Untethered Dead Reckoning GNSS Evaluation Kit, supports NEO-M8U and EVA-M8E
EVA-M8E application board, miniature EVA-M8E design example with integrated antenna

EVK-8/EVK-M8 evaluation kits enable simple evaluation of the high performance u-blox M8 positioning technology. The built-in USB interface provides both power supply and high-speed data transfer, and eliminates the need for an external power supply.AlphaMicro_u-blox_EVK-M8N

u-blox 8/M8 evaluation kits are compact, and their user-friendly interface and power supply make them ideally suited for use in laboratories, vehicles and outdoor locations. Furthermore, they can be used with a PDA or a notebook PC, making them the perfect companion through all stages of design-in projects.


  • Easy to use
  • Extensive visualization and evaluation features
  • Supports AssistNow Online and AssistNow Offline A-GNSS services
  • 1 USB port, 1 UART port, 1 I2C/SPI port (switchable)
  • All ports accessible outside
  • Power supply and data transfer over USB (USB V2.0 compatible)

Kit includes:

  • Compact 105 x 64 x 26 mm EVK‑M8 or EVK‑8 unit
  • USB cable
  • EVK‑M8: Active GPS / GLONASS / BeiDou antenna
  • EVK‑8: Active GPS / GLONASS antenna
  • Quick Start reference card

u-center GPS/GNSS evaluation software

The EVK-M8 download includes u-center, which is an interactive tool for configuration, testing, visualization and data analysis of positioning chips and modules. u-center provides useful assistance during all phases of a system integration project.

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Last updated: 23 August 2016