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MCP2122 bảng dữ liệu(PDF) 6 Page - Microchip Technology |
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MCP2122 bảng dữ liệu(HTML) 6 Page - Microchip Technology |
6 / 38 page MCP2122 DS21894C-page 6 Preliminary © 2007 Microchip Technology Inc. 2.3.1 BROWN-OUTS Some applications may subject the MCP2122 to a brown-out condition. Good design practice requires that when a system is in brown-out, the system should be in reset to ensure that the system is in a known state when the system exits the brown-out. This brown-out circuitry is external to the MCP2122. 2.3.1.1 External Brown-Out Reset Circuits Figure 2-2 shows a circuit for external brown-out protection using the TCM809 device. Figure 2-3 and Figure 2-4 illustrate two examples of external circuitry that may be implemented. Each option needs to be evaluated to determine if they satisfy the requirements of the application. FIGURE 2-2: EXTERNAL BROWN-OUT PROTECTION USING THE TCM809 FIGURE 2-3: EXTERNAL BROWN-OUT PROTECTION CIRCUIT 1 FIGURE 2-4: EXTERNAL BROWN-OUT PROTECTION CIRCUIT 2 VSS RST TCM809 VDD MCP2122 VDD RESET Note 1: Resistors should be adjusted for the characteristics of the transistor. 2: This circuit will activate reset when VDD goes below (Vz + 0.7V), where Vz = Zener voltage. VDD 33 k Ω 10 k Ω 40 k Ω VDD RESET MCP2122 Q1 R2 40 k Ω VDD RESET MCP2122 R1 Q1 VDD Note 1: This circuit is less expensive, but less accurate. Transistor Q1 turns off when VDD is below a certain level such that: 2: Resistors should be adjusted for the characteristics of the transistor. VDD • R1 R1 + R2 = 0.7V |
Số phần tương tự - MCP2122_07 |
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Mô tả tương tự - MCP2122_07 |
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