MCP19116 datasheet(41/246 Pages) MICROCHIP

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 2015-2016 Microchip Technology Inc.

DS20005479B-page 41

MCP19116/7

6.2

Output Overvoltage Protection

The MCP19116/7 devices feature output overvoltage

protection. This feature also utilizes a comparator

module similar to the standard PIC comparator module.

This is used to prevent the power system from being

damaged when the load is disconnected. The

OVREFCON register contains the digital value that

sets the analog DAC voltage at the inverting input of the

comparator. By comparing the divided down power

train output voltage connected to the non-inverting

input (VS) of the comparator with the OVREF reference

voltage, the user can determine when an overvoltage

event has occurred and can automatically take action.

The OVCON register contains the interrupt flag polarity

and OV enable bits along with the Output Status bit just

as VINCON does for the input voltage UVLO and

OVLO. When <OVEN> bit in the OVCON register is set

and an overvoltage occurs, the control logic

automatically sets the secondary gate drive output

(SDRV) high and the primary gate drive output (PDRV)

low.

Note:

The OVIF Interrupt Flag bit is set when an

interrupt condition occurs, regardless of

the state of its corresponding enable bit or

the Global Enable bit (GIE) in the INTCON

OVCON: OUTPUT OVERVOLTAGE COMPARATOR CONTROL REGISTER

U-0

R/W-0

R-0

R/W-0

—

OVEN

OVOUT

OVINTP

OVINTN

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 7-4

Unimplemented: Read as ‘0’

bit 3

OVEN: OV Comparator Output Enable bit

1 = OV Comparator output is enabled

0 = OV Comparator output is not enabled

bit 2

OVOUT: Output Overvoltage Status Output bit

1 = Output Overvoltage has occurred

0 = No Output Overvoltage has occurred

bit 1

OVINTP: OV Comparator Interrupt on Positive Going Edge Enable bit

1 = The OVIF interrupt flag will be set upon a positive going edge of the OV

0 = No OVIF interrupt flag will be set upon a positive going edge of the OV

bit 0

OVINTN: OV Comparator Interrupt on Negative Going Edge Enable bit

1 = The OVIF interrupt flag will be set upon a negative going edge of the OV

0 = No OVIF interrupt flag will be set upon a negative going edge of the OV

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