5V-3.3V VOLTAGE TRANSLATOR
All Mikroelektronika’s development systems feature a large number of peripheral
modules expanding microcontroller’s range of application and making the
process of program testing easier. In addition to these modules, it is also
possible to use numerous additional modules linked to the development system
through the I/O port connectors. Some of these additional modules can operate
as stand-alone devices without being connected to the microcontroller.
™
Manual
Additional Board
MikroElektronika
5V-3.3V VOLTAGE TRANSLATOR Additional Board
The
5V-3.3V VOLTAGE TRANSLATOR
additional board is used to adjust voltage levels between a 5V development system and a
3.3V device.
How to connect the board?
The additional board is connected to a development system via two 2x5 connectors and a flat cable with appropriate IDC10 connectors,
Figure 1. A 2x5 connector CN1 is used for connection with the development system, whereas a 2x5 connector CN2 is used for
connection with a device.
2x5 connector CN1
2x5 connector CN2
Figure 1:
5V-3.3V VOLTAGE TRANSLATOR
additional board
Figure 2:
Plugging IDC10 connector into
a development system
Figure 3:
Flat cable with IDC10 connectors
How does the board operate?
The additional board performs voltage adjustment by using two voltage translators 74LVCC3245. The board comes with jumpers
placed in the position indicating that a 5V voltage signal is adjusted to a 3.3V voltage signal. If necessary, the process of voltage
adjustment may be performed in the oposite direction, i.e. a 3.3.V voltage level may be adjusted to a 5V voltage level. In order to set
the voltage adjustment direction to be different from default, it is necessary to place jumpers as in Figure 5.
The additional board utilizes two power supply voltages for its operation. The 5V power supply voltage is supplied from the development
system, whereas the 3.3V power supply voltage is supplied from the device connected to the development system. If this device is not
capable of providing the 3.3V power supply voltage, it may be provided by reducing the 5V power supply voltage supplied from the
development system. This is performed by using a voltage regulator provided on the additional board. In order to enable this voltage
regulator, it is necessary to have jumper J17 placed on the board, Figure 7.
MikroElektronika
Arrows indicating
voltage signal
direction
Figure 4:
Jumpers DIR1 and DIR2 in the position for 5V to
3.3V voltage level adjustment
Figure 5:
Jumpers DIR1 and DIR2 in the position for 3.3V to
5V voltage level adjustment
In case it is necessary to send and receive different voltage signals at the
same time, jumpers belonging to jumper groups DIR1 and DIR2 should
be placed in the appropriate positions. Refer to Figure 6. Jumpers HVS1,
HVS4 and HVS5 belonging to jumper group DIR1 as well as jumpers
LVS0, LVS1, LVS4 and LVS5 belonging to jumper group DIR2 are placed
so as to enable 5V to 3.3V voltage signal adjustment. Likewise, jumpers
HVS2, HVS3, HVS6 and HVS7 belonging to jumper group DIR1 as well
as jumpers LVS2, LVS3, LVS6 and LVS7 belonging to jumper group DIR2
are placed so as to enable 3.3V to 5V voltage signal adjustment.
Figure 6:
Jumpers DIR1 and DIR2 in the position for
bidirectional transfer
Figure 7:
Jumper J17 placed on the board
MikroElektronika
Figure 8:
Additional board and development system connection schematic
MikroElektronika
Figure 9:
Additional board connection schematic
MikroElektronika
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