EVK-M8T User Guide
UBX-14041540 - R05
Device description
Page 9 of 22
Early Production Information
4.3.7
Test Connector
This 14-pin test-connector provides additional functionality to the EVK, allowing access to the
interface pins and an ability to measure the current used by the EVK. All pins are ESD protected.
For accurate measurements, it is recommended to use a cable of at most 1 meter in length. Figure 3
shows an example of a power supply connected to the test connector by using standard adapter
cables from the manufacture Hirschmann. Figure 4 shows an example for overall current
measurement. When connecting the 3.3 V digital interfaces RS232, SPI and DDC to your application,
a cable length less than 25 cm is recommended.
PIN Nr. PIN NAME
I/O LEVEL
DESCRIPTION
14
V5_IN
I
4.75 V - 5.25 V Power input – can be used instead of USB
13
GND
I
-
Common ground pin
12
P1A (VCC)
O
3.3 V
Power output – max. current supply 100 mA
1
Ω
1% resistor for over-all current measurement to pin 11 (P1B)
NOTE: the current includes also SQI Flash, LNA
11
P1B
O
Second connection for over-all current measurement (see Figure 5)
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
TIMEPULSE 1 O
3.3V
Time pulse 1 (internally buffered output)
7
EXTINT0
I
3.3 V
External interrupt or time-mark input
6
TIMEPULSE 2 O
3.3 V
Time pulse 2 (internally buffered output)
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-M8T (pins numbered from right to left on the front panel)
V5_IN
GND
GND
V5_IN
Hirschmann
Part Nr.: 934160100
Figure 3: Example 5V DC power supply
