EVK-7 / EVK-8 / EVK-M8 User Guide
UBX-14002502 - R09
Early Production Information
Device description
Page 13 of 28
11
P1B
O
Second connection for over-all current measurement (see Figure 6)
10
P2A
O
3.0 V
Battery output (unloaded)
100
Ω
1% resistor for battery backup current measurement to pin 9 (P2B)
NOTE: There is a current protection to 3 mA. See circuit in figure 7 (D2, D4, R29)
9
P2B
O
Second junction for battery backup current measurement
8
TIMEPULSE1
O
3.3 V
Time pulse 1 (internally buffered output)
2
7
EXTINT0
I
3.3 V
External interrupt input
6
RESERVED1
-
-
not connected
5
SDA /CS
I/O
3.3 V
If slide switch on I2C, then DDC interface selected; Function: data input / output
If slide switch on SPI, then SPI interface selected; chip select input – LOW ACTIVE
4
SCL / SCK
I/O
3.3 V
Clock input / output
3
TxD / MISO
I/O
3.3 V
If slide switch on I2C, then DDC interface selected / UART TxD (3.3V Level)
If slide switch on SPI, then SPI interface selected; Master in Slave out (MISO)
2
RxD / MOSI
I/O
3.3 V
If slide switch on I2C, then DDC interface selected / UART RxD (3.3V Level)
If slide switch on SPI, then SPI interface selected; Master out Slave in (MOSI)
1
GND
I
-
Common ground pin
Table 5: Connector pin description for EVK-7 / EVK-8 / EVK-M8 (pins numbered from right to left on the front panel)
4.3.9
LED
On the front panel of the unit, a single blue LED shows the time pulse 1 signal. The LED starts flashing one pulse
per second during a GNSS fix. If there is no GNSS fix, the LED will only light, without flashing.
4.3.10
Backup Battery
There is a backup battery in the evaluation unit. This is necessary to store orbital information between operations
and to enable faster start-up. It is a RENATA 3.0 V Li / MnO² battery of the type CR2450. The battery has a rated
capacity of 540 mA. The battery operating temperature range is -40° C to +85° C.
In case the built-in backup battery runs low or empty after a long storage period, purchase the above described
battery for replacement (refer to the section 10 for battery replacement guidelines).
CAUTION! RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF
USED BATTERIES ACCORDING TO THE INSTRUCTIONS!
4.3.11
GNSS Configuration
The EVK-7 and EVK-8 supports GPS, QZSS and GLONASS. The EVK-M8N/C and EVK-M8MEVA/EVK-M8QEVA
supports GPS, Galileo,
QZSS, GLONASS, and BeiDou.
The GNSS to be used can be configured on u-center (View
Messages View then UBX-CFG-GNSS). For more
information, refer to the
u-center User Guide
[21], the
u-blox 7 Receiver Description including Protocol
Specification
[9] and
u-blox 8 / u-blox M8 Receiver Description including Protocol Specification
[20].
4.3.12
RTC Configuration (EVK-7EVA and EVK-M8MEVA)
The EVK-7EVA and EVK-M8MEVA include the EVA-7M or EVA-M8M GNSS receiver with an external RTC. By
default, the EVA-7M or EVA-M8M module is not running in single crystal mode. The EVK-7EVA and EVK-
M8MEVA evaluation kits can be set to single crystal mode by using the configuration string described in the
EVA-7M Hardware Integration Manual
[8] and the
EVA-8M / EVA-M8M Hardware Integration Manual
[18].
Applying the configuration string results in a permanent change and cannot be reversed. The current
consumption is significantly higher in single crystal mode. For more information see the
EVA-7M Data Sheet
[5],
EVA-8M Data Sheet
[25] and the
EVA-M8M Data Sheet
[13].
2
Time pulse not available in all EVK versions. Please refer to section 4.3.4 on how to check availability of Time pulse 1 on your EVK.
