ST72325J7B5 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72325J7B5

8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE

STMicroelectronics 

ST72325

6.4 SYSTEM INTEGRITY MANAGEMENT (SI)

The System Integrity Management block contains

the Low Voltage Detector (LVD)Auxiliary Voltage

Detector (AVD) functions and Clock Security Sys-

tem (CSS). It is managed by the SICSR register.

6.4.1 Low Voltage Detector (LVD)

The Low Voltage Detector function (LVD) gener-

ates a static reset when the VDD supply voltage is

below a VIT- reference value. This means that it

secures the power-up as well as the power-down

keeping the ST7 in reset.

The VIT- reference value for a voltage drop is lower

than the VIT+ reference value for power-on in order

to avoid a parasitic reset when the MCU starts run-

ning and sinks current on the supply (hysteresis).

The LVD Reset circuitry generates a reset when

VDD is below:

– VIT+ when VDD is rising

– VIT- when VDD is falling

The LVD function is illustrated in Figure 17.

The voltage threshold can be configured by option

byte to be low, medium or high.

Provided the minimum VDD value (guaranteed for

the oscillator frequency) is above VIT-, the MCU

can only be in two modes:

Figure 17. Low Voltage Detector vs Reset

– under full software control

– in static safe reset

In these conditions, secure operation is always en-

sured for the application without the need for ex-

ternal reset hardware.

During a Low Voltage Detector Reset, the RESET

pin is held low, thus permitting the MCU to reset

other devices.

Notes:

The LVD allows the device to be used without any

external RESET circuitry.

If the medium or low thresholds are selected, the

detection may occur outside the specified operat-

ing voltage range. Below 3.8V, device operation is

not guaranteed.

The LVD is an optional function which can be se-

lected by option byte.

It is recommended to make sure that the VDD sup-

ply voltage rises monotonously when the device is

exiting from Reset, to ensure the application func-

tions properly.

VDD

VIT+

VIT-

Vhys

RESET

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