參數(shù)資料
型號(hào): STM706TAM6F
廠商: STMICROELECTRONICS
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝: 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁數(shù): 4/33頁
文件大?。?/td> 695K
代理商: STM706TAM6F
Operation
STM706T/S/R, STM706P, STM708T/S/R
Doc ID 10518 Rev 10
3.5
Power-fail input/output
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 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 STM70x or the micro-
processor drops below the minimum operating voltage.
If the comparator is unused, PFI should be connected to VSS and PFO left unconnected.
PFO may be connected to MR on the STM70x so that a low voltage on PFI will generate
a reset output.
3.6
Ensuring a valid reset output down to VCC = 0 V
When VCC falls below 1 V, the state of the RST output can no longer be guaranteed, and
becomes essentially an open circuit. If a high value pulldown resistor is added to the RST
pin, the output will be held low during this condition. A resistor value of approximately
100 k
Ω will be large enough to not load the output under operating conditions, but still
sufficient to pull RST to ground during this low voltage condition (see Figure 10).
Figure 10.
Reset output valid to ground circuit
AI08844
STM70x
RST
R1
相關(guān)PDF資料
PDF描述
STM708AM6F 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
STM707M6E 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
STO50U043306FREQ1 TCVCXO, CLOCK, 10 MHz - 20 MHz, HCMOS OUTPUT
STPR1520DF 15 A, 200 V, SILICON, RECTIFIER DIODE, TO-220AC
STPR1610CT 8 A, 100 V, SILICON, RECTIFIER DIODE, TO-220AB
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