Datasheet
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 = V
IN
divided down by 1/5
01111 = DC inductor valley current
10000 = Unimplemented
•
•
•
11100 = Unimplemented
11101 = Overcurrent reference
11110 = Unimplemented
11111 = Unimplemented