 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ST7LITE2 Datasheet(PDF) 29 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
ST7LITE2 Datasheet(HTML) 29 Page - STMicroelectronics |
|
|
29 / 133 page  ST7LITE2 29/133 7.6 SYSTEM INTEGRITY MANAGEMENT (SI) The System Integrity Management block contains the Low voltage Detector (LVD) and Auxiliary Volt- age Detector (AVD) functions. It is managed by the SICSR register. Note: A reset can also be triggered following the detection of an illegal opcode or prebyte code. Re- fer to section 12.2.1 on page 88 for further details. 7.6.1 Low Voltage Detector (LVD) The Low Voltage Detector function (LVD) gener- ates a static reset when the VDD supply voltage is below a VIT-(LVD) reference value. This means that it secures the power-up as well as the power-down keeping the ST7 in reset. The VIT-(LVD) reference value for a voltage drop is lower than the VIT+(LVD) reference value for power- on in order to avoid a parasitic reset when the MCU starts running and sinks current on the sup- ply (hysteresis). The LVD Reset circuitry generates a reset when VDD is below: –VIT+(LVD)when VDD is rising –VIT-(LVD) 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-(LVD), the MCU can only be in two modes: – 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. The LVD is an optional function which can be se- lected by option byte. Use of LVD with capacitive power supply: with this type of power supply, if power cuts occur in the ap- plication, it is recommended to pull VDD down to 0V to ensure optimum restart conditions. Refer to circuit example in Figure 84 on page 112 and note 4. 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. Figure 17. Low Voltage Detector vs Reset VDD VIT+(LVD) RESET VIT-(LVD) Vhys 1 |
Similar Part No. - ST7LITE2 |
|
Similar Description - ST7LITE2 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
