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Obsolete
Product(s)
- Obsolete
Product(s)
ST72324B-Auto
Electrical characteristics
12.4
LVD/AVD characteristics
12.4.1
Operating conditions with LVD
Subject to general operating conditions for TA.
12.4.2
Auxiliary voltage detector (AVD) thresholds
Subject to general operating conditions for TA.
Table 87.
Operating conditions with LVD
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIT+(LVD) Reset release threshold (VDD rise)
VD level = high in option byte
4.0(1)
4.2
4.5
V
VD level = med. in option byte(2) 3.55(1)
3.75
4.0(1)
VD level = low in option byte(2)
2.95(1)
3.15
3.35(1)
VIT-(LVD) Reset generation threshold (VDD fall)
VD level = high in option byte
3.8
4.0
4.25(1)
VD level = med. in option byte(2) 3.35(1)
3.55
3.75(1)
VD level = low in option byte(2)
2.8(1)
3.0
3.15(1)
Vhys(LVD) LVD voltage threshold hysteresis
(1)
VIT+(LVD)-VIT-(LVD)
150
200
250
mV
VtPOR
VDD rise time
(1)
Flash devices
6s/V
100ms/V
8/16K ROM devices
20ms/V
32K ROM devices
∝ ms/V
tg(VDD)
Filtered glitch delay on VDD
(1)
Not detected by the LVD
40
ns
1.
Data based on characterization results, tested in production for ROM devices only.
2.
If the medium or low thresholds are selected, the detection may occur outside the specified operating voltage range.
Table 88.
AVD thresholds
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIT+(AVD)
1
0 AVDF flag toggle threshold
(VDD rise)
VD level = high in option byte
4.4(1)
4.6
4.9
V
VD level = med. in option byte
VD level = low in option byte
3.6
VIT-(AVD)
0
1 AVDF flag toggle threshold
(VDD fall)
VD level = high in option byte
4.2
4.4
VD level = med. in option byte
4.0
VD level = low in option byte
3.4
Vhys(AVD) AVD voltage threshold hysteresis
VIT+(AVD)-VIT-(AVD)
200
mV
V
IT-
Voltage drop between AVD flag set and
LVD reset activated
VIT-(AVD)-VIT-(LVD)
450
1.
Data based on characterization results, tested in production for ROM devices only.