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| ST72321B Datasheet, PDF (141/187 Pages) STMicroelectronics – 64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface | |||
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OPERATING CONDITIONS (Contâd)
12.3.2 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for VDD, fCPU, and TA.
Symbol
VIT+(LVD)
VIT-(LVD)
Vhys(LVD)
VtPOR
tg(VDD)
Parameter
Reset release threshold
(VDD rise)
Conditions
VD level = High in option byte
VD level = Med. in option byte2)
VD level = Low in option byte2)
Min
4.01)
3.551)
2.951)
Reset generation threshold
(VDD fall)
VD level = High in option byte 3.8
VD level = Med. in option byte2) 3.351)
VD level = Low in option byte2) 2.81)
LVD voltage threshold hysteresis VIT+(LVD)-VIT-(LVD)
VDD rise time 3)2)
LVD enabled
VDD glitches filtered (not detect-
ed) by LVD 3)
6µs/V
Typ
4.2
3.75
3.15
4.0
3.55
3.0
200
Max
4.5
4.01)
3.351)
4.251)
3.751))
3.15 1)
100ms/V
40
Unit
V
mV
ns
Notes:
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.
Below 3.8V, device operation is not guaranteed.
3. Data based on characterization results, not tested in production.
3. When VtPOR is faster than 100 µs/V, the Reset signal is released after a delay of max. 42µs after VDD crosses the
VIT+(LVD) threshold.
12.3.3 Auxiliary Voltage Detector (AVD) Thresholds
Subject to general operating conditions for VDD, fCPU, and TA.
Symbol
VIT+(AVD)
VIT-(AVD)
Vhys(AVD)
âVIT-
Parameter
1â0 AVDF flag toggle threshold
(VDD rise)
0â1 AVDF flag toggle threshold
(VDD fall)
AVD voltage threshold hysteresis
Voltage drop between AVD flag set
and LVD reset activated
Conditions
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
VIT+(AVD)-VIT-(AVD)
VIT-(AVD)-VIT-(LVD)
Min
4.41)
3.95 1)
3.4 1)
4.21)
3.751)
3.21)
Typ
4.6
4.15
3.6
4.4
4.0
3.4
200
450
Max
4.91)
4.41)
3.81)
4.65 1)
4.2 1)
3.61)
Unit
V
mV
mV
1. Data based on characterization results, tested in production for ROM devices only.
12.3.4 External Voltage Detector (EVD) Thresholds
Subject to general operating conditions for VDD, fCPU, and TA.
Symbol
Parameter
Conditions
VIT+(EVD)
VIT-(EVD)
Vhys(EVD)
1â0 AVDF flag toggle threshold
(VDD rise)1)
0â1 AVDF flag toggle threshold
(VDD fall)1)
EVD voltage threshold hysteresis
VIT+(EVD)-VIT-(EVD)
1. Data based on characterization results, not tested in production.
Min Typ Max Unit
1.15 1.26 1.35
V
1.1
1.2
1.3
200
mV
141/187
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