ST7FMC2S4T3 STMicroelectronics, ST7FMC2S4T3 Datasheet - Page 33

• Manufacturer Part Number: ST7FMC2S4T3
• Description: IC MCU 8BIT 16K FLASH 44-LQFP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FMC2S4T3

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LINSCI, SPI
• Peripherals: LVD, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-LQFP
• Processor Series: ST7FMC2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 60
• Number Of Timers: 3
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7MC-KIT/BLDC, ST7MDT50-EMU3, STX-RLINK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• For Use With: 497-8402 - BOARD EVAL COMPLETE INVERTER497-8400 - KIT IGBT PWR MODULE CTRL ST7MC497-6408 - BOARD EVAL BLDC SENSORLESS MOTOR497-4734 - EVAL KIT 3KW POWER DRIVER BOARD497-4733 - EVAL KIT 1KW POWER DRIVER BOARD497-4732 - EVAL KIT 300W POWER DRIVER BOARD497-4731 - EVAL KIT PWR DRIVER CONTROL BRD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

SYSTEM INTEGRITY MANAGEMENT (Cont’d)
6.3.2 Auxiliary Voltage Detector (AVD)
The Voltage Detector function (AVD) is based on
an analog comparison between a V
V
ply. The V
lower than the V
age in order to avoid parasitic detection (hystere-
sis).
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 function is active only if the
LVD is enabled through the option byte (see
tion 14.1 on page
6.3.2.1 Monitoring the V
If the AVD interrupt is enabled, an interrupt is gen-
erated when the voltage crosses the V
V
Figure 18. Using the AVD to Monitor V
IT+(AVD)
IT-(AVD)
AVDF bit
AVD INTERRUPT
REQUEST
IF AVDIE bit = 1
LVD RESET
V
V
V
V
IT+(AVD)
IT+(LVD)
IT-(LVD)
IT-(AVD)
threshold (AVDF bit toggles).
reference value and the V
IT-
reference value for falling voltage is
V
DD
IT+
290).
reference value for rising volt-
0
DD
Main Supply
DD
INTERRUPT PROCESS
IT-(AVD)
IT+(AVD)
main sup-
V
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
DD
hyst
sec-
and
or
1
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
The interrupt on the rising edge is used to inform
the application that the V
If the voltage rise time t
CPU cycles (depending on the reset delay select-
ed by option byte), no AVD interrupt will be gener-
ated when V
If t
– If the AVD interrupt is enabled before the
– If the AVD interrupt is enabled after the V
V
rupts will be received: the first when the AVDIE
bit is set, and the second when the threshold is
reached.
threshold is reached then only one AVD interrupt
will occur.
rv
IT+(AVD)
is greater than 256 or 4096 cycles then:
threshold is reached, then 2 AVD inter-
Figure
IT+(AVD)
t
18.
rv
VOLTAGE RISE TIME
is reached.
ST7MC1xx/ST7MC2xx
rv
DD
is less than 256 or 4096
warning state is over.
INTERRUPT PROCESS
0
IT+(AVD)
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