EVA-M8E - Hardware Integration Manual
UBX-15028542 - R05
Contents
Page 12 of 44
Production Information
Figure 3
: Connecting an external SQI Flash memory
Running the firmware from the SQI Flash requires a minimum SQI Flash size of 8 Mbit. An 8 Mbit
device is also sufficient to save AssistNow Offline and AssistNow Autonomous information as well as
Current configuration data. However, to run firmware from the SQI Flash and provide space for logging
results, a minimum size of 8 Mbit might not be sufficient, depending on the amount of data to be
logged.
☞
For more information about supported SQI Flash devices see Table 15.
EVA-M8E modules have a configurable
VCC_IO
monitor threshold (iomonCfg) to ensure that the
EVA-M8E receiver only starts if the
VCC_IO
supply is within the supply range of the SQI Flash device
(VCC_IO is used to supply the SQI Flash). This will ensure that any connected SQI Flash memory will
be detected correctly at startup. See the u-blox 8 / u-blox M8 Receiver Description Including Protocol
Specification [2] for setting the iomonCfg value.
The
VCC_IO
monitor threshold is set to default 2.69 V value to support minimum 2.7 V
VCC_IO
voltage. If the default value for the
VCC_IO
monitor threshold is not suitable it can be set according
to the IO supply voltage level (
VCC_IO
) in the eFuse by the Low Level Configuration. If VCC_IO voltage
3.0 V to 3.6 V is used, send the following sequence to the module
•
B5 62 06 41 0C 00 00 00 03 1F 4F 22 4C 5C FF 7F 7F FF 8A 7C
☞
Applying these sequences result in a permanent change and cannot be reversed. An unstable
supply voltage at the
VCC_IO
pin while applying these sequences can also damage the receiver.
☞
Make sure that the
SAFEBOOT_N
pin is available for entering Safe Boot Mode. Programming the
SQI Flash memory with a Flash firmware is done typically at production. For this purpose the EVA-
M8E module have to enter the Safe Boot Mode. More information about
SAFEBOOT_N
pin see
section 2.6.
☞
The default concurrent reception will be reset to GPS/QZSS/SBAS and GLONASS. EVA-M8E can
be changed to concurrent GPS/QZSS/SBAS and BeiDou by sending a dedicated UBX message
(
UBX-CFG-GNSS
) to the module. More information see the u-blox 8 / u-blox M8 Receiver
Description Including Protocol Specification [2].
2.3
I/O Pins
All I/O pins make use of internal pull-ups. Thus, there is no need to connect unused pins to
VCC_IO
.
