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MCP651 数据表(PDF) 21 Page - Microchip Technology |
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MCP651 数据表(HTML) 21 Page - Microchip Technology |
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21 / 56 page  © 2011 Microchip Technology Inc. DS22146B-page 21 MCP651/2/4/5/9 3.5 Calibrate/Chip Select Digital Input This input (CAL/CS, …) is a CMOS, Schmitt-triggered input that affects the calibration and low power modes of operation. When this pin goes high, the part is placed into a low power mode and the output is high-Z. When this pin goes low, a calibration sequence is started (which corrects VOS). At the end of the calibration sequence, the output becomes low impedance and the part resumes normal operation. An internal POR triggers a calibration event when the part is powered on, or when the supply voltage drops too low. Thus, the MCP652 parts are calibrated, even though they do not have a CAL/CS pin. 3.6 Exposed Thermal Pad (EP) There is an internal connection between the Exposed Thermal Pad (EP) and the VSS pin; they must be con- nected to the same potential on the Printed Circuit Board (PCB). This pad can be connected to a PCB ground plane to provide a larger heat sink. This improves the package thermal resistance ( θJA). |
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