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MCP1318MT bảng dữ liệu(PDF) 30 Page - Microchip Technology |
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MCP1318MT bảng dữ liệu(HTML) 30 Page - Microchip Technology |
30 / 52 page MCP131X/2X DS21985D-page 30 2005-2012 Microchip Technology Inc. 4.1 Reset Voltage Trip Point (V TRIP) Operation The device’s Reset voltage trip point (V TRIP) is selected when the device is ordered. As the voltage on the device’s VDD pin is above or below this selected trip point, the output of the Reset pin (RST/RST) will be forced to either the inactive or active state. For the voltage trip point, there is a minimum trip voltage (VTRIPMIN) and a maximum trip voltage (VTRIPMAX). The voltage that the device “actually” trips at will be referred to as VTRIP. The trip voltage is specified for the falling of the device VDD. There is also a hysteresis (VHYS) on the trip point. This is so that noise on the device voltage (VDD) does not cause the Reset pin (RST/RST) to “jitter” (change between driving an active and inactive state). The Reset pin (RST or RST) will be forced active if any of the following occur: • The Manual Reset input (MR) goes low • The Watchdog Timer times out •VDD goes below the threshold • During device power-up After the device exits the Reset condition, the delay circuitry will hold the RST and RST pins active until the appropriate Reset delay time (tRST) has elapsed. TABLE 4-1: RESET PIN STATES Device State of RST Pin when: State of RST (3) Pin when: Output Driver VDD < VTRIP VDD > VTRIP + VHYS VDD < VTRIP VDD > VTRIP + VHYS MCP1316 L H — — Push-pull MCP1316M LH (2) — — Open-drain (2) MCP1317 — — H L Push-pull MCP1318 L H H L Push-pull MCP1318M LH (2) H L Open-drain (2) MCP1319 L H H L Push-pull MCP1319M LH (2) H L Open-drain (2) MCP1320 LH (1) — — Open-drain (1) MCP1321 LH (1) H L Open-drain (1) MCP1322 LH (1) H L Open-drain (1) Note 1: Requires External Pull-up resistor. 2: Has Internal Pull-up resistor. 3: The RST pin output is always push-pull. |
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