STM32W108CBU6 STMICROELECTRONICS [STMicroelectronics], STM32W108CBU6 Datasheet - Page 159

• Manufacturer Part Number: STM32W108CBU6
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STM32W108CB, STM32W108HB
12.3.2
Operating conditions at power-up
Power-on resets (POR HV and POR LV)
The STM32W108 measures the voltage levels supplied to the three power domains. If a
supply voltage drops below a low threshold, then a reset is applied. The reset is released if
the supply voltage rises above a high threshold. There are three detection circuits for power
on reset as follows:
●
●
●
Table 27.
Table 28.
Table 29.
The POR LVcore and POR LVmem reset sources are merged to provide a single reset
source, POR LV, to the Reset Generation module, since the detection of either event needs
to reset the same system modules.
NRST pin
A single active low pin, NRST, is provided to reset the system. This pin has a Schmitt
triggered input.
To afford good noise immunity and resistance to switch bounce, the pin is filtered with the
Reset Filter module and generates the reset source RSTB to the Reset Generation module.
Table 30.
Always-on domain release
Always-on domain assert
Supply rise time
1.25 V domain release
1.25 V domain assert
1.8 V domain release
1.8 V domain assert
Reset filter time constant
POR HV monitors the always on domain supply voltage. Thresholds are given in
Table
POR LVcore monitors the core domain supply voltage. Thresholds are given in
Table
POR LVmem monitors the memory supply voltage. Thresholds are given in
Parameter
Parameter
Parameter
27.
28.
POR HV thresholds
POR LVcore thresholds
POR LVmem thresholds
Reset filter specification for RSTB
Parameter
From 0.5 V to 1.7 V
Doc ID 16252 Rev 2
Test conditions
Test conditions
Test conditions
1.35
1.26
Min
Min
Min
Min
1.0
0.5
0.9
0.8
2.1
Electrical characteristics
12.0
Typ
Typ
Typ
Typ
1.2
0.6
1.0
0.9
1.5
1.4
Max
Max
Max
1.65
1.54
Max
16.0
250
0.7
1.1
1.0
1.4
Table
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Unit
Unit
Unit
Unit
µs
µs
29.
V
V
V
V
V
V