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ST7DALI Datasheet(PDF) 31 Page - STMicroelectronics

Part No. ST7DALI
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7DALI
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SYSTEM INTEGRITY MANAGEMENT (Cont’d)
7.6.2 Auxiliary Voltage Detector (AVD)
The Voltage Detector function (AVD) is based on
an analog comparison between a VIT-(AVD) and
VIT+(AVD) reference value and the VDD main sup-
ply voltage (VAVD). The VIT-(AVD) reference value
for falling voltage is lower than the VIT+(AVD) refer-
ence value for rising voltage in order to avoid par-
asitic detection (hysteresis).
The output of the AVD comparator is directly read-
able by the application software through a real
time status bit (AVDF) in the SICSR register. This
bit is read only.
Caution: The AVD functions only if the LVD is en-
abled through the option byte.
7.6.2.1 Monitoring the VDD Main Supply
The AVD voltage threshold value is relative to the
selected LVD threshold configured by option byte
(see section 15.1 on page 130).
If the AVD interrupt is enabled, an interrupt is gen-
erated when the voltage crosses the VIT+(LVD) or
VIT-(AVD) threshold (AVDF bit is set).
In the case of a drop in voltage, the AVD interrupt
acts as an early warning, allowing software to shut
down safely before the LVD resets the microcon-
troller. See Figure 18.
Figure 18. Using the AVD to Monitor VDD
VDD
VIT+(AVD)
VIT-(AVD)
AVDF bit
01
RESET
IF AVDIE bit = 1
Vhyst
AVD INTERRUPT
REQUEST
INTERRUPT Cleared by
VIT+(LVD)
VIT-(LVD)
LVD RESET
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
0
1
hardware
INTERRUPT Cleared by
reset
1




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