System overview
UM0897
10/25
Doc ID 17012 Rev 1
2.2.4
Power supply unit
The onboard supply unit contains the low drop fixed positive voltage regulator
LD1117D33TR to generate 3.3 V and ultra-low drop voltage regulator LDS3985M18R to
generate 1.8 V. This 1.8 V supply is needed for the STR9 microcontroller.
2.2.5 User
interface
section
A set of 6 keys is provided for the user interface section in order to select the options on the
TFT.
Figure 7.
User interface