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ANSELA 数据表(PDF) 56 Page - Microchip Technology |
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ANSELA 数据表(HTML) 56 Page - Microchip Technology |
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56 / 222 page  MCP19111 DS22331A-page 56 2013 Microchip Technology Inc. 8.2 Unity Gain Buffer The unity gain buffer module is used during a multi- phase application and while operating in Bench Test mode. When the ATSTCON<BNCHEN> bit is set, the device is in Bench Test mode and the ASEL<4:0> bits of the BUFFCON register determine which internal analog signal can be measured on the GPA0 pin. When measuring signals with the unity gain buffer, the buffer offset must be added to the measured signal. The factory measured buffer offset can be read from memory location 2087h. Refer to Section 11.1.1 “Reading Program Memory as Data” for more infor- mation. REGISTER 8-2: BUFFCON: UNITY GAIN BUFFER CONTROL REGISTER R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 MLTPH2 MLTPH1 MLTPH0 ASEL4 ASEL3 ASEL2 ASEL1 ASEL0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-5 MLTPH<2:0>: System configuration bits 000 = Device set as stand-alone unit 001 = Device set as multiple output MASTER 010 = Device set as multiple output SLAVE 011 = Device set as multi-phase MASTER 100 = Device set as multi-phase SLAVE bit 4-0 ASEL<4:0>: Multiplexer output control bit 00000 = Voltage proportional to current in the inductor 00001 = Error amplifier output plus slope compensation, input to PWM comparator 00010 = Input to slope compensation circuitry 00011 = Band gap reference 00100 = Output voltage reference 00101 = Output voltage after internal differential amplifier 00110 = Unimplemented 00111 = Voltage proportional to the internal temperature 01000 = Internal ground for current sense circuitry, see Section 6.5 “Voltage for Zero Current” 01001 = Output overvoltage comparator reference 01010 = Output under voltage comparator reference 01011 = Error amplifier output 01100 = For a multi-phase SLAVE, error amplifier signal received from MASTER 01101 = For multi-phase SLAVE, error signal received from MASTER with gain, see Section 6.8 “MASTER Error Signal Gain” 01110 = VIN divided down by 1/5 01111 = DC inductor valley current 10000 = Unimplemented • • • 11100 = Unimplemented 11101 = Overcurrent reference 11110 = Unimplemented 11111 = Unimplemented |
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