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MCP201TEP bảng dữ liệu(PDF) 8 Page - Microchip Technology |
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MCP201TEP bảng dữ liệu(HTML) 8 Page - Microchip Technology |
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8 / 40 page  MCP201 DS21730F-page 8 © 2007 Microchip Technology Inc. TABLE 1-4: FAULT / SLPS SLOPE SELECTION DURING POR TABLE 1-5: FAULT / SLPS TRUTH TABLE 1.6 Internal Voltage Regulator The MCP201 has a low drop-out voltage, positive regulator capable of supplying 5.00 VDC ±5% at up to 50 mA of load current over the entire operating temperature range. With a load current of 50 mA, the minimum input-to-output voltage differential required for the output to remain in regulation is typically +0.5V (+1V maximum over the full operating temperature range). Quiescent current is less than 1.0 mA, with a full 50 mA load current, when the input-to-output voltage differential is greater than +2V. The regulator requires an external output bypass capacitor for stability. The capacitor should be either a ceramic or tantalum for stable operation over the extended temperature range. The compensation capacitor should range from 1.0 µf – 22 µf and have a ESR or CSR of 0.4 Ω – 5.0Ω. The input capacitor, CF, in Figure 1.4 should be on the order of 8 to 10 times larger than the output capacitor, CG. Designed for automotive applications, the regulator will protect itself from reverse battery connections, double- battery jumps and up to +40V load dump transients. The voltage regulator has both short-circuit and thermal shutdown protection built-in. Regarding the correlation between VBAT, VREG and IDD, please refer to Figure 1-4 through 1-6. When the input voltage (VBAT) drops below the differential needed to provide stable regulation, the output VREG will track the input down to approximately 3.5V, at which point the regulator will turn off. This will allow microcontrollers with internal POR circuits to generate a clean arming of the Power-on Reset trip point. The MCP201 will then monitor VBAT and turn on the regulator when VBAT is 6.0V. The device will come up in either READY1 or READY mode and will have to be transitioned to Operational mode to re-enable data transmission. In the start phase, VBAT must be at least 6.0V (Figure 1-4) to initiate operation during power-up. In Power-down mode, the VBAT monitor will be turned off. The regulator has a thermal shutdown. If the thermal protection circuit detects an overtemperature condition caused by an overcurrent condition (Figure 1-6) of the regulator, it will shut down. The regulator has an overload current limiting. During a short-circuit, VREG is monitored. If VREG is lower than 3.5V, the regulator will turn off. After a thermal recovery time, the VREG will be checked again. If there is no short-circuit (VREG > 3.5V), the regulator will be switched back on. The MCP201 will come up in either READY1 or READY mode and will have to be transitioned to Operational mode to re-enable data transmission. The accuracy of the voltage regulator, when using a pass transistor, will degrade due to the extra external components needed. All performance characteristics should be evaluated on every design. FAULT/SLPS Slope Shaping HNormal LAlternate(1) Note 1: This mode does not conform to LIN bus specification version 1.3, but might be used for K-line applications. Note: This pin is ‘0’ whenever the internal circuits have detected a short or thermal excursion and have disabled the LIN output driver. Note: Every time TX is toggled, a Fault condition will occur for the length of time, depending on the bus load. The Fault time is equal to the propagation delay. TXD In RXD Out LIN Bus I/O Thermal Override FAULT / SLPS Out Comments LH VBAT OFF L Bus shorted to battery HH VBAT OFF H Bus recessive L L GND OFF H Bus dominant H L GND OFF L Bus shorted to ground xx VBAT ON L Thermal excursion Legend: x = don’t care |
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