MCP19116-ESLASHMJ datasheet(51/246 Pages) MICROCHIP

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 2015-2016 Microchip Technology Inc.

DS20005479B-page 51

MCP19116/7

6.11.2

ERROR AMPLIFIER DISABLE

The error amplifier can be disabled such that its output

is parked to a known state. The <EADIS> bit defaults to

zero and the error amp is enabled during normal

operation. In case the user wants to disable the error

amplifier, setting the EADIS bit parks the error amplifier

output to just below the low clamp voltage. Under

normal operation, the error amplifier output runs

between

2 * BG

(upper

clamp

value)

and

1 * BG – 150 mV (lower clamp value). The analog

feedback circuitry utilizes an offset pedestal (1 * BG) to

improve accuracy at low levels.

ABECON: ANALOG BLOCK ENABLE CONTROL REGISTER

R/W-0

U-0

R/W-0

DIGOEN

DSEL2

DSEL1

DSEL0

DRUVSEL

—

EADIS

ANAOEN

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

u = Bit is unchanged

x = Bit is unknown

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 7

DIGOEN: DIG Test MUX to GPA0 connection control

1 = DIG Test MUX output is connected to external pin GPA0

0 = DIG Test MUX output is not connected to external pin GPA0

bit 6-4

DSEL<2:0> Digital Test Signals

000 = QRS (output of DESAT comparator)

001 = PWM_L (PWM output after monostable)

010 = PWM (oscillator output from the microcontroller)

011 = TMR2EQ (when TMR2 equals PR2)

100 = OV (overvoltage comparator output)

101 = SWFRQ (switching frequency output)

110 = SDRV_ON_ONESHOT (200 ns one-shot signal to reset WDM logic)

111 = Unimplemented

bit 3

DRUVSEL: Selects gate drive undervoltage lockout level

1 = Gate Drive UVLO set to 5.4V

0 = Gate Drive UVLO set to 2.7V

bit 2

Unimplemented: Read as ‘0’

bit 1

EADIS: Error Amplifier Disable bit

1 = Disables the error amplifier (Output parked low, clamped to 1 * BG)

0 = Enables the error amplifier (Normal operation)

bit 0

ANAOEN: Analog MUX Output Control bit

1 = Analog MUX output is connected to external pin GPA0

0 = Analog MUX output is not connected to external pin GPA0

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