71M6545HT-IGTSLASHF datasheet(36/66 Pages) MAXIM

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71M6545T/71M6545HT

Energy Meter ICs

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Figure 6. Waveforms Comparing Voltage, Current, Energy per Interval, and Accumulated Energy

Transitions from SLP mode to BRN mode can be initiated

by the following events:

1) Wake-up timer timeout.

2) Pushbutton (PB) is activated.

3) A rising edge on DIO4 or DIO55.

4) Activity on the RX or OPT_RX pins.

Brownout Mode

In BRN mode, most nonmetering digital functions are

active including ICE, UART, EEPROM, and RTC. In BRN

mode, the PLL continues to function at the same fre-

quency as MSN mode. It is up to the MPU to reduce the

PLL frequency or the MPU frequency in order to minimize

power consumption.

From BRN mode, the MPU can choose to enter SLP mode.

When system power is restored while the 71M654xT is in

BRN mode, the part automatically transitions to MSN

mode.

Sleep Mode

When the VV3P3SYS pin voltage drops below 2.8 VDC,

the 71M654xT enters BRN mode and the VV3P3D pin

obtains power from the VBAT pin instead of the VV3P3SYS

pin. Once in BRN mode, the MPU may invoke SLP mode

by setting the SLEEP bit. The purpose of SLP mode is to

consume the least amount power while still maintaining

the real time clock, temperature compensation of the

RTC, and the nonvolatile portions of the I/O RAM.

In SLP mode, the VV3P3D pin is disconnected, removing

all sources of current leakage from the VBAT pin. The

nonvolatile I/O RAM locations and the SLP mode functions,

such as the temperature sensor, oscillator, RTC, and the

RTC temperature compensation are powered by the

VBAT_RTC pin. SLP mode can be exited only by a system

power-up event or one of the wake methods.

If the SLEEP bit is asserted when VV3P3SYS pin power is

present (i.e., while in MSN mode), the 71M654xT enters

SLP mode, resetting the internal WAKE signal, at which

point the 71M654xT begins the standard wake from sleep

procedures.

When power is restored to the VV3P3SYS pin, the

71M654xT transitions from SLP mode to MSN mode and

the MPU PC (Program Counter) is initialized to 0x0000.

At this point, the XRAM is in an undefined state, but

nonvolatile I/O RAM locations are preserved.

Applications Information

Connecting 5V Devices

All digital input pins of the 71M654xT are compatible with

external 5V devices. I/O pins configured as inputs do not

require current-limiting resistors when they are connected

to external 5V devices.

Direct Connection of Sensors

The 71M654xT supports direct connection of current

transformer and shunt-fed sensors.

Using the 71M6545T/HT with Local Sensors

The 71M6545T/HT can be configured to operate with

locally connected current sensors. All current inputs are

connected to a current transformer (CT) and are there-

fore isolated. This configuration implements a polyphase

-500

-400

-300

-200

-100

100

200

300

400

500

TIME (ms)

VOLTAGE (V)

CURRENT (A)

ENERGY PER INTERVAL (Ws)

ACCUMULATED ENERGY (Ws)

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