OPTION_REG datasheet(56/222 Pages) MICROCHIP

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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.

BUFFCON: UNITY GAIN BUFFER CONTROL REGISTER

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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