2
Hardware architecture
The
evaluation boards are equipped with:
•
CN1 connector: used only if the board is connected to an external microcontroller.
Table 1.
CN1 pin description
Pin
Description
Sel1 Sel2, Sel3
Output voltage selectors
EN
Enable input
TW (for the
only) Thermal warning output and overvoltage warning output
WI (for the
only)
Watchdog input
RST
Reset output
VEXT
Input external voltage reference (3.3 or 5 V)
GND
Ground reference
VADC
Output voltage. This pin can be used to read the output voltage via a configured
external ADC peripheral that belongs to the MCU.
•
Jumpers: to be used in standalone working mode only.
Table 2.
Jumper pin description
Pin
Description
Sel1 Sel2, Sel3
Output voltage selectors.
To set SELx to high, put a jumper between the central position and ‘1’ position.
To set SELx to low, put a jumper between the central position and ‘0’ position.
EN1
Enable jumper.
To enable the board, mount the jumper and remove it right after.
Vcw1 (for the
only)
Watchdog disable jumper.
In standalone mode, disable the watchdog by applying a jumper on Vcw1.
•
Voltage connectors
Table 3.
Voltage connector details
Connector
Description
VS
Operating DC power supply voltage range from 2.15 to 28 V
V
O
LDO output voltage
UM3028
Hardware architecture
UM3028
-
Rev 1
page 4/37
