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MCP121-475 bảng dữ liệu(PDF) 12 Page - Microchip Technology |
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MCP121-475 bảng dữ liệu(HTML) 12 Page - Microchip Technology |
12 / 26 page MCP111/112 DS21889D-page 12 © 2005 Microchip Technology Inc. 4.2 Negative Going VDD Transients The minimum pulse width (time) required to cause a reset may be an important criteria in the implementa- tion of a Power-on Reset (POR) circuit. This time is referred to as transient duration, defined as the amount of time needed for these supervisory devices to respond to a drop in VDD. The transient duration time is dependant on the magnitude of VTRIP – VDD. Generally speaking, the transient duration decreases with increases in VTRIP – VDD. Figure 4-3 shows a typical transient duration vs. reset comparator overdrive for which the MCP111/112 will not generate a reset pulse. It shows that the farther below the trip point the transient pulse goes, the duration of the pulse required to cause a reset gets shorter. Figure 2-18 shows the transient response characteristics for the MCP111/112. A 0.1 µF bypass capacitor, mounted as close as possible to the VDD pin, provides additional transient immunity (refer to Figure 4-1). FIGURE 4-3: Example of Typical Transient Duration Waveform. 4.3 Effect of Temperature on Time-out Period (tRPU) The time-out period (t RPU) determines how long the device remains in the reset condition. This is affected by both V DD and temperature. The graph shown in Figures 2-22, 2-23 and 2-24 show the typical response for different V DD values and temperatures. 4.4 Using in PICmicro® Microcontroller ICSP™ Applications (MCP111 only) Figure 4-4 shows the typical application circuit for using the MCP111 for voltage supervisory function when the PICmicro microcontroller will be programmed via the In-Circuit Serial Programming™ (ICSP) feature. Additional information is available in TB087, “Using Voltage Supervisors with PICmicro® Microcon- troller Systems which Implement In-Circuit Serial Programming™”, DS91087. FIGURE 4-4: Typical Application Circuit for PICmicro® Microcontroller with the ICSP™ feature. Time (µs) 0V 5V VTRIP(MIN) - VDD tTRANS VTRIP(MAX) VTRIP(MIN) Note: It is recommended that the current into the RST pin be current limited by a 1 k Ω resistor. VDD/VPP VDD MCLR (reset input) (Active-Low) VSS PICmicro® MCU RPU 0.1 µF 1k Ω MCP111 VDD RST VSS |
Số phần tương tự - MCP121-475 |
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Mô tả tương tự - MCP121-475 |
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