Datasheet

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 at 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.
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.
Figure 1: 5V-3.3V VOLTAGE TRANSLATOR additional board
2x5 connector CN2
2x5 connector CN1
Figure 3: Flat cable with IDC10 connectors
Figure 2: Plugging IDC10 connector into
a development system