STM32W108HB datasheet(159/179 Pages) STMICROELECTRONICS

159 / 179 page

STM32W108CB, STM32W108HB

Electrical characteristics

Doc ID 16252 Rev 2

159/179

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:

●

POR HV monitors the always on domain supply voltage. Thresholds are given in

Table 27.

●

POR LVcore monitors the core domain supply voltage. Thresholds are given in

Table 28.

●

POR LVmem monitors the memory supply voltage. Thresholds are given in 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 27.

POR HV thresholds

Parameter

Test conditions

Min

Typ

Max

Unit

Always-on domain release

1.0

1.2

1.4

Always-on domain assert

0.5

0.6

0.7

Supply rise time

From 0.5 V to 1.7 V

250

µs

Table 28.

POR LVcore thresholds

Parameter

Test conditions

Min

Typ

Max

Unit

1.25 V domain release

0.9

1.0

1.1

1.25 V domain assert

0.8

0.9

1.0

Table 29.

POR LVmem thresholds

Parameter

Test conditions

Min

Typ

Max

Unit

1.8 V domain release

1.35

1.5

1.65

1.8 V domain assert

1.26

1.4

1.54

Table 30.

Reset filter specification for RSTB

Parameter

Min

Typ

Max

Unit

Reset filter time constant

2.1

12.0

16.0

µs

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