The MTi 600-series Development Board (MTi-600 DEV) exposes the pins of the MTi-600 on the External connector, a 2.54 mm pitch header, making it easier for the user to test all the features and the peripherals offered by the MTi-600. Next to that, the MTi-600 DEV has a micro USB connector and two DSUB9 connectors for testing different communication protocols. It also includes a mikroBUS™ compatible GNSS extension socket to connect a GNSS module for the MTi-670-DK and MTi-680-DK. This chapter discusses in more detail the connections and peripherals available on the MTi-600 DEV.
The MTi-600 DEV has the following connections as shown in the figure below:
MTi 600-series Development Board overview with connector designators
The External Connector makes all of the MTi-600 pins available on a 2.54 mm pitch header. The pin numbering is an exact copy of the MTi-600 pinning itself. All pins have a direct connection to the MTi-600 except for pin 1 (Vext). Pin 1 is connected through a diode and can only be used to power the MTi-600 (not for monitoring). The pinning can be seen in the following table.
Pin descriptions of External Connector
|
Pin |
Name |
I/O |
Description |
|
1 |
Vext |
PWR |
Power input |
|
2 |
GND |
PWR |
Ground |
|
3 |
CAN_H |
I/O |
CAN bus differential low side |
|
4 |
CAN_L |
I/O |
CAN bus differential high side |
|
5 |
RS232_TxD |
O |
RS232 transmitter output to host |
|
6 |
RS232_RTS |
O |
RS232 Ready To Send output to host |
|
7 |
RS232_RxD |
I |
RS232 receiver input from host |
|
8 |
RS232_CTS |
I |
RS232 Clear To Send input from host |
|
9 |
SYNC_IN1 |
I |
Multifunctional synchronization input |
|
10 |
SYNC_IN2 |
I |
Multifunctional synchronization input |
|
11 |
GNSS_TxD |
O |
RS232 transmitter output to GNSS module |
|
12 |
GNSS_RxD |
I |
RS232 receiver input from GNSS module |
|
13 |
SYNC_OUT |
O |
Configurable synchronization output |
|
14 |
GND |
PWR |
Ground |
|
15 |
UART_TxD |
O |
UART transmitter output |
|
16 |
UART_RxD |
I |
UART receiver input |
The MTi-600-DK can be supplied by USB or through the External Connector. In case the External Connector is used to power the board, the USB power will be disconnected from the MTi-600. Additionally, pin 9 of both DSUB9 connectors can be connected directly to pin 1 (Vext) of the External connector by placing the corresponding zero-Ohm resistor.
The micro USB port on the main board can be used to connect the MTi-600 to a host through the included micro USB cable. The USB device requires the drivers that are automatically included when downloading the MT Software Suite. The following table shows the required switch configuration for this connection.
|
Switch |
Position |
|
SW1 |
- |
|
SW2 |
Down (default) |
Connector 1 can be used to connect a CAN bus to the MTi-600 with a DSUB9 connector. The table below shows the pinning of this connector. The DSUB9 connector connects directly to the MTi-600 without relying on any switch. The CAN bus interface includes a 120 Ohm termination resistor on the MTi-600 DEV.
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Pin out of DSUB9 connector CAN
DSUB9 connector 1 pinning for CAN
|
Pin |
Name |
Description |
|
2 |
CAN_L |
CAN bus differential low side |
|
3 |
GND |
Ground |
|
5 |
GND |
Ground |
|
7 |
CAN_H |
CAN bus differential high side |
|
9 |
VIN_Ext |
Supply input (requires zero-Ohm resistor) |
Switch SW1 needs to be set in the downward position to enable the RS232 connections on DSUB9 connector 2. The table below shows the pinning of DSUB9 connector 2 if the RS232 interface is enabled.
Pin out of DSUB9 connector RS232
DSUB9 connector 2 pinning for RS232
|
Pin |
Name |
Description |
|
2 |
RS232_TxD |
RS232 transmitter output to host |
|
3 |
RS232_RxD |
RS232 receiver input from host |
|
5 |
GND |
Ground |
|
7 |
RS232_CTS |
RS232 Clear To Send input from host |
|
8 |
RS232_RTS |
RS232 Ready To Send output to host |
|
9 |
VIN_Ext |
Supply input (requires zero-Ohm resistor) |
Switch configuration for enabling RS232
|
Switch |
Position |
|
SW1 |
Down (default) |
|
SW2 |
- |
To activate the RS422 interface, switch SW1 should be in the upward position and switch SW2 in the middle position. The table below shows the pinning of DSUB9 connector 2 if the RS422 connections are enabled. The RS422 interface includes a 120 Ohm termination resistor on both the RxD and TxD lines.
|
Pin |
Name |
Description |
|
1 |
RS422_RxD- |
RS422 negative receiver input from host |
|
2 |
RS422_RxD+ |
RS422 positive receiver input from host |
|
3 |
RS422_TxD+ |
RS422 positive transmitter output to host |
|
4 |
RS422_TxD- |
RS422 negative transmitter output to host |
|
5 |
GND |
Ground |
|
9 |
VIN_Ext |
Supply input (requires zero-Ohm resistor) |
Switch configuration for enabling RS422
|
Switch |
Position |
|
SW1 |
Up |
|
SW2 |
Mid |
To be able to use the UART pins on the External Connector, switch SW2 needs to be set in the upward position. This will ensure that the UART_RxD is not controlled by any of the transceivers of the MTi-600 DEV. The UART_TxD will still transmit over USB and RS422 (when enabled), allowing the user to monitor the MTi-600 output. The UART pinning on the External Connector can be seen in table #Pin descriptions of External Connector.
Switch configuration for enabling UART
|
Switch |
Position |
|
SW1 |
- |
|
SW2 |
Up |
The MTi-670-DK comes with the GNSS daughter card installed in the GNSS extension socket.
The GNSS extension socket has mikroBUS™ compatible pinning. This enables the user to connect alternate GNSS daughter card modules with mikroBUS™ pinning to the MTi-600-DEV. The pinning connections for the GNSS extension socket are listed in the table below. This extension only uses the 3.3V supply pin, which is connected to the 3V3 that is generated on the MTi-600 DEV.
Connections on UART communication GNSS extension sockets.
|
Pin |
Mikro BUS |
MTi-670/680 |
Pin |
Mikro BUS |
MTi-670/680 |
|
P200-1 |
AN |
NC |
P201-1 |
PWM |
NC |
|
P200-2 |
RST |
Pull-up |
P201-2 |
INT |
SYNC_IN2 |
|
P200-3 |
CS |
NC |
P201-3 |
TX |
GNSS_RxD |
|
P200-4 |
SCK |
NC |
P201-4 |
RX |
GNSS_TxD |
|
P200-5 |
MISO |
NC |
P201-5 |
SCL |
NC |
|
P200-6 |
MOSI |
NC |
P201-6 |
SDA |
NC |
|
P200-7 |
3.3V |
3V3 |
P201-7 |
5V |
5V |
|
P200-8 |
GND |
GND |
P201-8 |
GND |
GND |
The MTi-600 DEV board translates the RS232 signal levels from the MTi-600 to the 3V3 UART levels used on the extension board. This transceiver can be disabled by placing a zero-Ohm resistor on the GNSS_Disable resistor position (see #MTi 600-series Development Board overview with connector designators). In this case, the GNSS pins on the External connector can be used to connect an RS232 level enabled GNSS receiver.
As shown in the figures below, the standard GNSS daughter card consists of a GNSS receiver and a barometer sensor component. The barometer is not used/connected to the MTi-670-DK, since the MTi-600 has an internal barometer. The LEDs (Power and PPS) give an indication of the proper functioning of the GNSS daughter card. The supplied GNSS antenna can be connected to the SMA connector.
Top view (left) and the bottom view (right) of the MTi-670-DK GNSS daughter card
The MTi-680-DK comes with the RTK GNSS daughter card installed in the GNSS extension socket. As shown in the figures below, the RTK GNSS daughter card consists of an RTK GNSS receiver, a barometer sensor component, an Xbee socket and a USB connector. The barometer is not used/connected to the MTi-680-DK, since the MTi-600 has an internal barometer. The LEDs (Power, PPS, Xbee and RTK status) give an indication of proper functioning of the RTK GNSS daughter card and Xbee power. The supplied GNSS antenna can be connected to the SMA connector.
Top view (left) and the bottom view (right) of the MTi-680-DK RTK GNSS daughter card
The RTK GNSS daughter card is equipped with an XBee module socket. XBee modules are embedded solutions providing wireless end-point connectivity to devices. The XBee socket can be used to feed RTCM correction messages to the MTi-680-DK RTK GNSS receiver or to connect to an XBee wireless module.
|
Pin |
GNSS board |
|
P202-1 |
VRADIO (3V3, max. 300 mA) |
|
P202-2 |
RTCM_RxD |
|
P202-3 |
RTCM_TxD |
|
P202-[4..9] |
NC |
|
P202-10 |
GND |
|
P203-[11..20] |
NC |
The RTK GNSS daughter card (GNSS-RTK-DK-D) also features a Safeboot pin which can be used in case communication issues with the GNSS module on the daughter card arise. Please refer to BASE for instructions on how to use this pin and how to retrieve communication.
MTi-600 DEV power supply specifications
|
|
Min |
Typ |
Max |
Unit |
|
VUSB |
4.5 |
5 |
5.5 |
V |
|
Vext |
4.5 |
- |
24 |
V |
Absolute maximum ratings MTi-600 DEV
|
Parameter |
Min |
Max |
Unit |
Comments |
|
Operating temperature |
-40 |
+85 |
ºC |
|
|
Vext |
-0.3 |
30 |
V |
Power input on External connector or DSUB9 connectors |
|
VUSB |
-0.3 |
6.0 |
V |
USB power input |
|
VUART |
-0.3 |
3.6 |
V |
|
|
VRS232/SYNC |
-25 |
25 |
V |
|
|
VRS422 |
-15 |
15 |
V |
|
|
VCAN_DC |
-58 |
58 |
V |
Common mode voltage of CAN_H and CAN_L with respect to ground |
|
VCAN_DIFF |
-17 |
17 |
V |
Differential voltage between CAN_H and CAN_L |
|
Acceleration[1] |
|
10,000 |
g |
Any axis, unpowered, for 0.2 ms |
|
ESD protection[2] |
|
±2000 |
V |
Human body model |
[1] This is a mechanical shock (g) sensitive device. Proper handling is required to prevent damage to the part.
[2] This is an ESD-sensitive device. Proper handling is required to prevent damage to the part.
MTi 600-series Development Board drawing (Top and Side view)