参数资料
型号: ST72F324K2B6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 20/156页
文件大小: 1027K
代理商: ST72F324K2B6
ST72324J/K
116/156
OPERATING CONDITIONS (Cont’d)
12.3.3 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for VDD,fCPU, and TA.
Notes:
1. Data based on characterization results, not tested in production.
2. When VtPOR is faster than 100 s/V, the Reset signal is released after a delay of max. 42s after VDD crosses the
VIT+(LVD) threshold.
3. Applicable only in low voltage devices (planned).
Figure 62. LVD Startup Behaviour
Note: When the LVD is enabled, the MCU reaches its authorized operating voltage from a reset state.
However, in some devices, the reset state is released when VDD is approximately between 0.8V and 1.5V.
As a consequence, depending on the ramp-up speed, the I/Os may toggle when VDD is within this win-
dow.
This may be an issue especially for applications where the MCU drives power components.
Because Flash write access is impossible within this window, the Flash memory contents will not be cor-
rupted.
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 byte3)
VD level = Low in option byte3)
3.55 1)
2.95 1)
3.75
3.15
4.0
3.35
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 byte3)
VD level = Low in option byte3)
3.35
2.8
3.55
3.0
3.751)
3.15 1)
Vhys(LVD)
LVD voltage threshold hysteresis 1)
VIT+(LVD)-VIT-(LVD)
150
200
250
mV
VtPOR
VDD rise time
1)2)
6
s/V
tg(VDD)
Filtered glitch delay on VDD
1)
Not detected by the LVD
40
ns
5V
1.5V
VIT+
0.8V
LVD RESET
V D
D
Window
t
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