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MCP1318MT bảng dữ liệu(PDF) 27 Page - Microchip Technology |
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MCP1318MT bảng dữ liệu(HTML) 27 Page - Microchip Technology |
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27 / 44 page  © 2005 Microchip Technology Inc. DS21985A-page 27 MCP131X/2X 4.1.1 POWER-UP/RISING VDD As the device VDD rises, the device’s Reset circuit will remain active until the voltage rises above the “actual” trip point (VTRIP) plus the hysteresis (VHYS). Figure 4-13 shows a power-up sequence and the waveform of the RST and RST pins. As the device powers up, the voltage will start below the valid operating voltage of the device. At this volt- age, the Reset output value is not valid. Once the volt- age is above the minimum operating voltage (1V) and below the selected VTRIP, the Reset output will be active. Once the device voltage rises above the “actual” trip point (VTRIP) plus the hysteresis (VHYS), the Reset delay timer (tRST) starts. When the Reset delay timer times out, the Reset output (RST/RST) is driven inactive. FIGURE 4-13: Reset pin Operation on a Power-up. 4.1.2 POWER-DOWN/BROWN-OUTS As the device powers-down/brown-outs, the voltage (VDD) falls from a voltage above the devices trip point (VTRIP). The devices “actual” trip point voltage (VTRIP) will be between the minimum trip point (V TRIPMIN) and the maximum trip point (VTRIPMAX). Once the device voltage (VDD) goes below this voltage, the Reset pin(s) will be forced to the active state. There is a hysteresis on this trip point. This is so that noise on the device volt- age (VDD) does not cause the Reset pin (RST/RST) to “jitter” (change between driving an active and inactive). Figure 4-14 shows the waveform of the RST pin as determined by the VDD voltage, while Table 4-1 shows the state of the RST pin. 4.1.2.1 Operation of RST pin with Internal Pull-Up Resistor The internal pull-up resistor has a typical value of 4.7 k Ω. The internal pull-up eliminates the need for an external resistor. To reduce the current consumption of the device, when the RST pin is driving low, the resistor is disconnected. FIGURE 4-14: RST Operation as determined by the VTRIP and VHYS. Note: While the Reset delay timer (tRST) is active, additional system current is con- sumed. VTRIPMAX VTRIPMIN VTRIP 1V VDD VTRIP + VHYS tRST RST RST Note: Only the MCP1316M, MCP1318M and MCP1319M devices have an open-drain RST output pin with an internal pull-up resistor. VDD VTRIPMAX VTRIPMIN VTRIP VTRIP VTRIP + VHYS RST 1V < 1V is outside the device specifications tRPD tRST tRPD tRST |
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