RM0401 Rev 3 73/771
RM0401 Power controller (PWR)
90
4.2.2 Brownout reset (BOR)
During power on, the Brownout reset (BOR) keeps the device under reset until the supply
voltage reaches the specified V
BOR
threshold.
V
BOR
is configured through device option bytes. By default, BOR is off. 3 programmable
V
BOR
threshold levels can be selected:
• BOR Level 3 (VBOR3). Brownout threshold level 3.
• BOR Level 2 (VBOR2). Brownout threshold level 2.
• BOR Level 1 (VBOR1). Brownout threshold level 1.
Note: For full details about BOR characteristics, refer to the "Electrical characteristics" section in
the device datasheet.
When the supply voltage (V
DD
) drops below the selected V
BOR
threshold, a device reset is
generated.
The BOR can be disabled by programming the device option bytes. In this case, the
power-on and power-down is then monitored by the POR/ PDR or by an external power
supervisor if the PDR is switched off through the PDR_ON pin (see
Section 4.2.1: Power-on
reset (POR)/power-down reset (PDR)).
The BOR threshold hysteresis is ~100 mV (between the rising and the falling edge of the
supply voltage).
Figure 9. BOR thresholds
-36
6$$6$$!
M6
HYSTERESIS
"/2THRESHOLD
2ESET
To Next Page
Loading...
Need help?
General
