MCP39F511N datasheet(37/61 Pages) MICROCHIP

37 / 61 page

 2015-2018 Microchip Technology Inc.

DS20005473B-page 37

MCP39F511N

7.0

EVENT OUTPUT PINS/EVENT

CONFIGURATION REGISTER

7.1

Event Pins

The MCP39F511N device has two event pins that can

be configured in three possible configurations. These

configurations are:

No event is mapped to the pin

Voltage Surge, Voltage Sag, Over Current or

Over Power event is mapped to the pin. More

than one event can be mapped to the same pin.

Manual control of two pins, independently. Pos-

sible only when no event is mapped to the pin.

These three configurations allow for the control of

external interrupts or hardware that is dependent on

the measured power, current or voltage. The Event

Configuration Register below describes how these

events and pins can be configured.

7.2

Limits

There are 6 limit registers associated with these

events:

• Voltage Sag Limit

• Voltage Surge Limit

• Over Current Limit, channel 1

• Over Power Limit, channel 1

• Over Current Limit, channel 2

• Over Power Limit, channel 2

Each of these limits are compared to the respective

output registers of voltage, current and power, and

should have the same unit, e.g. 0.1V, 0.01W, etc.

7.3

Voltage Sag and Voltage Surge

Detection

The event alarms for Voltage Sag and Voltage Surge

work differently compared to the Over Current and

Over Power events, which are tested against every

computation cycle. These two event alarms are

designed to provide a much faster interrupt if the con-

dition occurs. Note that neither of these two events

have a respective Hold register associated with them,

since the detection time is less than one line cycle.

The calculation engine keeps track of a trailing mean

square of the input voltage, as defined by Equation 7-1:

EQUATION 7-1:

Therefore, at each data-ready occurrence, the value of

VSA is compared to the programmable threshold set in

the Voltage Sag Limit register and Voltage Surge Limit

these events are masked to either the Event1 or

Event2 pin, a logic-high interrupt will be given on these

pins.

The Sag or Surge events can be used to quickly

determine if a power failure has occurred in the system.

7.4

Calibration Status Events

The Event register contains eight bits that correspond

to the pass/fail of a calibration attempt issued through

the Auto-Calibrate Gain commands.

These commands can be used to calibrate all

single-point calibration outputs for both channels:

• Line Frequency

•Voltage

• Channel 1 Current

• Channel 1 Active Power

• Channel 1 Reactive Power

• Channel 2 Current

• Channel 2 Active Power

• Channel 2 Reactive Power

Bits 31-24 are status bits with a 1 representing a

calibration fail. These bits are reset to 0 when a

calibration command is successful for whichever

channel (or both) is being calibrated. For more

information

calibration,

see

Section 9.3

“Single-Point Gain Calibrations at Unity Power

Factor”.



LINE

SAMPLE

--------------------------V

SAMPLE

LINE



--------------------------

–





MCP39F511N Datasheet(PDF) 37 Page - Microchip Technology

MCP39F511N Datasheet(HTML) 37 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

Datasheet Download

Link URL