78M6610+LMU Data Sheet
Multipurpose (MP) Pins
The 78M6610+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
Register
MASK0
MASK4
Description
MP4
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).
MP6/ADDR1 MASK6
MP7
MASK7
MP10
MASK10
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 78M6610+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
Description
RYA_TON
RYB_TON
Relay turn-on delay following low-to-high transition of referenced voltage.
RYA_TOFF
RYB_TOFF
Relay turn-off delay following high-to-low transition of referenced voltage.
TOFF_DELAY
Line
Voltage
TON_DELAY
Relay
Command
De-Energized
De-Energized
Energized
Figure 26. Relay Timing
41
Rev 0
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
