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STM1061N31WX6F bảng dữ liệu(PDF) 6 Page - STMicroelectronics |
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6 / 21 page STM1061 6/21 PIN DESCRIPTIONS See Figure 2., page 4 and Table 1., page 4 for a brief overview of the signals connected to this de- vice. OUT (Open Drain). This is the Open Drain Out- put. It goes low when VCC drops below VTH–, and remains low as long as VCC is below VTH– + VHYST. VCC. This is the Supply voltage and input for the Voltage Detector. VSS. Ground, VSS, is the reference for the power supply. It must be connected to the system ground. Table 2. Pin Functions OPERATION Output The STM1061 Voltage Detector monitors system voltages from 1.6V to 5V in 100mV increments. The detector is designed to ignore fast transients on VCC and has a voltage hysteresis (VHYST). The STM1061 asserts an output signal (OUT) whenev- er VCC goes below the Voltage Detect Threshold (VTH–). The output signal (OUT) stays asserted until VCC goes above the Voltage Detect Release (VTH+). Output voltage (VOUT) is guaranteed valid down to VCC =0.7V at 25°C. The STM1061has an open drain active-low output which will sink current when output is asserted. Connect a pull-up resistor from OUT to any supply voltage up to 6V (see Figure 6., page 5). Select a resistor value large enough to register a logic low, and small enough to register a logic high while all of the input current and leakage paths connected to the reset output line are being supplied. A 10k pull-up is sufficient in most applications. The advantages of open drain output is the ability to connect more open drain outputs in parallel (wired OR connections) as well as connect the output to a power supply voltage different from VCC. Negative-Going VCC Transients and Undershoot The STM1061 device is relatively immune to neg- ative-going VCC transients (glitches). The graph (see Figure 11., page 9) indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (further below the thresh- old), the maximum allowable pulse width decreas- es. Any combination of duration and overdrive which lies under the curve will NOT generate a re- set signal. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional tran- sient immunity. Pin Name Function SOT23-3 SOT323-3 (SC70-3) 12 OUT Active-Low Open Drain Output 33 VCC Supply Voltage 21 VSS Ground |
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