MAX78615-LMU View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX78615-LMU

Isolated Energy Measurement Processor

Maxim Integrated 

MAX78615+LMU Data Sheet

Multipurpose (MP) Pins

The MAX78615+LMU provides five MASK registers for signaling the status of any STATUS bit to one of five

Multipurpose (MP) DIO pins. These MASK registers have the same bit mapping as the STATUS register. The user

must first enable the respective MP pin as an output before the DIO can be driven to its active state.

Pin Name

MP0

MP4

MP6/ADDR1

MP7

Register

MASK0

MASK4

MASK6

MASK7

Description

A combination of a bit set in both the STATUS register and

a MASK register causes the assigned MP pin to be

activated (default active-low).

Relay Control

If one of the RELAY bits in a MASK register is set, only the respective relay status bit in the STATUS register will

change the state of the assigned MP pin. Two options are provided for controlling the state of the RELAY status bit:

1. Manual control of relay status using the STATUS_SET and STATUS_RESET registers.

2. Autonomous control determined by the state of other bits in the STATUS and MASK register. For example, if a

MASK register has the RELAY1 and VA_SURGE bits set, a surge alarm on voltage source VA would assert the

RELAY1 status bit.

The MAX78615+LMU includes a programmable delay for driving the MP pins from the MASK register when the

relay bit is set. The relay control logic allows setting a delay time (increments of 250µs) for energizing (setting) and

de-energizing (clearing) the relay pin relative to the zero crossing of the referenced voltage source. The time

specified in the registers is expressed in number of high-rate samples. There is a pipeline delay of 1 sample

introduced by the timers.

Registers

RYA_TON

RYB_TON

RYA_TOFF

RYB_TOFF

Description

Relay turn-on delay following low-to-high transition of referenced voltage.

Relay turn-off delay following high-to-low transition of referenced voltage.

TOFF_DELAY

Line

Voltage

Relay

Command

De-Energized

TON_DELAY

Energized

Figure 22. Relay Control

De-Energized

Rev 0

38

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