- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄225250 > STM1404ATNDQ6F (STMICROELECTRONICS) 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 PDF資料下載
參數(shù)資料
| 型號： | STM1404ATNDQ6F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 7/35頁 |
| 文件大?。?/td> | 366K |
| 代理商： | STM1404ATNDQ6F |
第1頁第2頁第3頁第4頁第5頁第6頁當前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁
STM1404
Operation
The power-fail input (PFI) is compared to an internal reference voltage (independent from
the VRST comparator). If PFI is less than the power-fail threshold (VPFI), the power-fail
output (PFO) will go low. This function is intended for use as an undervoltage detector to
signal a failing power supply. Typically PFI is connected through an external voltage divider
(see Figure 4 on page 9) to either the unregulated DC input (if it is available) or the
regulated output of the VCC regulator. The voltage divider can be set up such that the
voltage at PFI falls below VPFI several milliseconds before the regulated VCC input to the
STM1404 or the microprocessor drops below the minimum operating voltage.
During battery backup, the power-fail comparator is turned off and PFO goes (or remains)
power returns, the power-fail comparator is enabled and PFO follows PFI. If the comparator
is unused, PFI should be connected to VSS and PFO left unconnected. PFO may be
connected to MR so that a low voltage on PFI will generate a reset output.
3.4
Applications information
These supervisor circuits are not short-circuit protected. Shorting VOUT to ground -
excluding power-up transients such as charging a decoupling capacitor - destroys the
device. Decouple both VCC and VBAT pins to ground by placing 0.1 F capacitors as close to
the device as possible.
Table 3.
I/O status in battery backup
Pin
Status
VOUT
Connected to VBAT through internal switch
VCC
Disconnected from VOUT
PFI
Disabled
PFO
Logic low
MR
Disabled
RST
Logic low
VBAT
Connected to VOUT
Vccsw
Logic high
VREF
Pulled to VSS below 2.4 V (VSW)
BLD
Logic high
VTPU
Connected to VBAT through an internal switch
相關PDF資料 |
PDF描述 |
|---|---|
| STM1404CSMDQ6F | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| STM1404CRMDQ6F | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| STM1404CRNCQ6F | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| STM1404CRODQ6F | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
| STM6778YHWB6E | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| STM1404ATNHQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Security Supervisor with Battery Switchover |
| STM1404ATNIQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Security Supervisor with Battery Switchover |
| STM1404ATNJQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Security Supervisor with Battery Switchover |
| STM1404ATOBQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3 V FIPS-140 security supervisor with battery switchover |
| STM1404ATOCQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Security Supervisor with Battery Switchover |
發(fā)布緊急采購，3分鐘左右您將得到回復。