MCP39F511 datasheet(39/62 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005393B-page 39

MCP39F511

7.0

EVENT OUTPUT PINS/EVENT

CONFIGURATION REGISTER

7.1

Event Pins

The MCP39F511 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.

Note:

If an event is mapped to a pin, manual

control of the respective pin is not possible.

To enable manual control, no event has to

be mapped to the pin.

7.2

Limits

There are five limit registers associated with these

events:

• Overtemperature limit. The overtemperature

event is only available on system versions

0xFA14 and later.

• 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 (analog input voltage register) and is

a number between 0 and 1023.

When

the

threshold

has

been

passed

the

corresponding event flags and event pins (if mapped)

will be 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 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.

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