MCP39F511A datasheet(39/68 Pages) MICROCHIP

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 2018 Microchip Technology Inc.

DS20006044A-page 39

MCP39F511A

7.0

EVENT OUTPUT PINS/EVENT

CONFIGURATION REGISTER

7.1

Event Pins

The MCP39F511A 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, Overcurrent, Over-

temperature or Overpower event is mapped to

the pin. More than one event can be mapped to

the same pin.

Manual control of two pins, independently

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 five limit registers associated with these

events:

• Overtemperature limit

• Voltage Sag limit

• Voltage Surge limit

• Overcurrent limit

• Overpower limit

Each of these limits are compared to the respective

output registers of voltage, current and power. It is

recommended that they have the same unit for

comparison, e.g. 0.1V, or 0.01W.

7.2.1

OVERTEMPERATURE LIMIT

The Overtemperature Limit register is compared to the

10-bit SAR output (Thermistor Voltage Register) and is

a number between 0 and 1023.

When the threshold is passed, the corresponding event

flags and event pins (if mapped) are set.

7.2.2

VOLTAGE SAG AND VOLTAGE

SURGE DETECTION

The event alarms for Voltage Sag and Voltage Surge

work differently compared to the Overcurrent and Over-

power events, which are tested against every computa-

tion cycle. These two event alarms are designed to

provide a much faster interrupt if the condition 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 the following

equation:

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 mapped 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.

7.2.3

OVERCURRENT LIMIT

The Over Current Limit register is compared to the

Current RMS register. When the threshold is passed,

the corresponding event flags and event pins (if

mapped) are set.

7.2.4

OVERPOWER LIMIT

The Over Power Limit register is compared to the

Active Power register. When the threshold is passed,

the corresponding event flags and event pins (if

mapped) are set.

7.3

Voltage Low and Voltage High

Threshold

The MCP39F511A device offers two additional

registers for monitoring the input voltage, the Voltage

Low Threshold and Voltage High Threshold registers.

When the input voltage crosses (high to low) the value

held in the VoltageLowThreshold register, a write to the

device EEPROM will be triggered (saving the Energy

counters).

To avoid multiple writes to EEPROM, a hysteresis is

implemented using VoltageHighThreshold register.

At power-up, when the input voltage crosses (low to

high) the value held in the VoltageHighThreshold

automatically (loading the energy counters). There are

no event bits defined for this feature.

Note:

If an event is mapped to a pin, manual

control of the respective pin is not possi-

ble. To enable manual control, no event

has to be mapped to the pin.

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