HW description
UM1454
14/28
Doc ID 022085 Rev 2
2.5
HW general features
2.5.1
I/O signal voltage configuration
2.5.2 Reset
STEVAL integrates a reset pushbutton that generates a reset pulse for the STM32W. The
reset signal can also be externally generated via pin 24 of the J2 connector.
2.5.3 Configurable
button
STEVAL integrates two SW-configurable pushbuttons that are connected to the PB6 and
PB0 pins of the STM32W micro.
2.5.4
Voltage battery meter
STEVAL allows to measure the residual voltage available when an external battery is used.
The function is enabled through the SW and is derived by means of an IMD9A component
whose output is connected to one of the analog ports of the STM32W micro.
Table 5.
STEVAL interfaces maximum voltage configuration
Connector
Pin
Range values
Description
J2
extension
connector
Pin 1
Max. 6 V external power supply
voltage (may be used also as supply
input if selected by user using the
proper jumper positioning).
This pin is totally user settable (pay attention
to avoid power supply conflicts).
Pin 2
0 V interface
GND - system ground (0 V)
Pin 3
3.3 V output board power supply (10
mA maximum current available).
Take care when used to supply external
circuits
Pin 4
0 V interface
GND - system ground (0 V)
Pin 5 to 24
Max. 3.3 V interface voltage
All the system logic signals and I/O signals
must be interfaced by a maximum 3.3 V level
voltage
J3 emulator
connector
Pin 1,2
Max. 3.3 V interface voltage
Supply and enable for the external emulator
(pay attention to avoid power supply
conflicts).
Pin
4,6,8,10,12,
14,16,18,20
0 V interface
GND - system ground (0 V)
Pin
3,5,7,9,13,15
Max. 3.3 V interface voltage
All the emulator interface logic signals must
be interfaced by a maximum 3.3 V level
voltage
Pin
11,17,19
10 k
Ω
pull-down interface
10 k
Ω
resistor connected to GND internally
on the board
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