
71M6513/71M6513H
A Maxim Integrated Products Brand
VAR (DIO7)
PULSES
W (DIO6)
3 -Phase Energy Meter IC
DATA SHEET
SEPTEMBER 2011
DISPLAY (me-
mory-mapped
APULSEW
APULSER
EXT_PULSE
LCD segments)
SERIAL
(UART0/1)
DATA
MPU
EEPROM
ADC
SAMPLES
CE_BUSY
(I2C)
Mux Ctrl.
CE
XFER_BUSY
INTERRUPTS
DIO
I/O RAM (CONFIGURATION RAM)
Figure 18: MPU/CE Communication (Functional)
The MPU will wait for the CE to signal that fresh data is ready (the XFER interrupt). It will read the data and perform additional
processing such as energy accumulation.
CE PRAM
FLASH
CE_EN
COMPUTATION
XFER Interrupt
ENGINE
CE DRAM
MPU
Figure 19: MPU/CE Communication (Processing Sequence)
Fault, Reset, Power-Up
Reset Mode: When the RESETZ pin is pulled low or when V1 < VBIAS, all digital activity in the chip stops while analog circuits
are still active. The oscillator and RTC module continue to run. Additionally, all I/O RAM bits are cleared. As long as V1, the
input voltage at the power fault block, is greater than VBIAS, the internal 2.5V regulator will continue to provide power to the
digital section.
Once initiated, the reset mode will persist until the reset timer times out, signified by WAKE rising. This will occur in 4100
cycles of the real time clock after RESETZ goes high, at which time the MPU will begin executing its preboot and boot
sequences from address 00. See the security section for more description of preboot and boot.
? 2005-2011 Teridian Semiconductor Corporation
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