2Hardware description and setup
This section provides a description of the main components of this evaluation kit, giving instruction for a quick
setup of the system.
2.1 Components description
The evaluation kit consists of two main components:
• 1 Motherboard based on STM8A microcontroller, interfacing host PC with daughterboard. The
communication with the PC is established through isolated USB.
• 1 Daughterboard assembling EVAL-L99H02QF.
The daughterboard with EVAL-L99H02QF and the motherboard are already properly plugged provided.
Figure 2. EVAL-L99H02QF block diagram
2.2 Motherboard schematic
A universal motherboard is used to control and drive the daughterboard containing the EVAL-L99H02QF. The
motherboard has the following functions:
• USB-to-UART conversion: a FT232RL USB to serial UART interface is used to convert the data from the
GUI, in the PC, in commands that are processed by the microcontroller.
• STM8AF51xAT microcontroller: it is used to convert the commands from the GUI in control signals for the
L99H02QF in the daughterboard. Also it process the data received from the L99H02QF and return the
results to the GUI by the USB.
• L4995R LDO: this LDO is used to convert the +12 V used to supply the motherboard to a +5 V voltage used
to supply the microcontroller and the L99H02QF in the daughterboard.
• Socket and connectors to plug the daughterboard.
The motherboard schematic is shown in the following figures. Schematic and BOM of the motherboard can be
found on the ST website.
UM2922
Hardware description and setup
UM2922 - Rev 1 page 3/18
