71M6531D/F, 71M6532D/F
Energy Meter IC
DATA SHEET
Simplifying System IntegrationTM
19-5374; Rev 1; 4/13
FEATURES
GENERAL DESCRIPTION
• Wh accuracy < 0.1% over 2000:1 current
The 71M6531D/F and 71M6532D/F are highly
range
integrated SOCs with an MPU core, RTC, FLASH and LCD
driver. The patented Single Converter Technology® with a
22-bit delta-sigma ADC, four analog inputs, digital tempera-
ture compensation, precision voltage reference, battery voltage
monitor and 32-bit computation engine (CE) supports a wide
range of residential metering applications with very few low-
cost external components.
• Exceeds IEC62053/ANSI C12.20 standards
• Four sensor inputs
• Low-jitter Wh and VARh plus two additional
pulse test outputs (4 total, 10 kHz maximum)
with pulse count
• Four-quadrant metering
• Tamper detection (Neutral current with CT,
Rogowski or shunt, magnetic tamper input)
A 32-kHz crystal time base for the entire system and internal
battery backup support for RAM and RTC further reduce system
cost. The IC supports 2-wire, and 3-wire single-phase and
dual-phase residential metering along with tamper-detection
mechanisms. The 71M6531D/F offers single-ended inputs for
two current channels and two single-ended voltage inputs.
The 71M6532D/F has two differential current inputs and three
single-ended voltage inputs.
Maximum design flexibility is provided by multiple UARTs, I2C,
μWire, up to 21 DIO pins and in-system programmable FLASH
memory, which can be updated with data or application code
in operation.
• Line frequency count for RTC
• Digital temperature compensation
• Sag detection for phase A and B
• Independent 32-bit compute engine
• 46-64 Hz line frequency range with same
calibration. Phase compensation (± 7°)
• Three battery modes with wake-up on timer
or push-button:
BROWNOUT Mode (52 µA typ.)
LCD Mode (21 µA typ., DAC active)
SLEEP Mode (0.7 µA typ.)
• Energy display during mains power failure
• 39 mW typical consumption @ 3.3 V, MPU
clock frequency 614 kHz
• 22-bit delta-sigma ADC with 3360 Hz or
2520 Hz sample rate
A complete array of ICE and development tools, programming
libraries and reference designs enable rapid development and
certification of TOU, AMR and Prepay meters that comply with
worldwide electricity metering standards.
• 8-bit MPU (80515),1 clock cycle per instruction,
10 MHz maximum, with integrated ICE for
debug
• RTC for TOU functions with clock-rate adjust
register
CT/SHUNT
A
LOAD
POWER SUPPLY
NEUTRAL
CT
LOAD
B
• Hardware watchdog timer, power fail monitor
• LCD driver with 4 common segment drivers:
Up to 156 (71M6531D/F) or 268 pixels
(71M6532D/F)
• Up to 22 (71M6531D/F) or 43 (71M6532D/F)
general-purpose I/O pins. Digital I/O pins
compatible with 5 V inputs
ADC
V3.3
SYS
V3.3A
GNDA GNDD
IAP*
IAN*
VA
PWR MODE
CONTROL
IBP*
IBN*
VB
WAKE-UP
71M6531
71M6532
REGULATOR
VBAT
V2.5
BATTERY
TEMP
VOLTAGE REF
LCD & DIO
• 32 kHz time base
SENSOR
VREF
COM0..3
LCD SEG
SEG/DIO
VBIAS
RAM
• High-speed slave SPI interface to data RAM
• Two UARTs for IR and AMR, IR driver with
modulation
• FLASH memory with security and in-system
program update:
128 KB (71M6531D/32D)
256 KB (71M6531F/32F)
• 4 KB MPU XRAM
• Industrial temperature range
88.88.8888
SERIAL PORTS
FLASH
MEMORY
TX
RX
AMR
IR
I2C or µWire
EEPROM
COMPUTE
ENGINE
RX/DIO1
TX/DIO2
SENSE
DRIVE/MOD
TEST PULSES
SPI HOST
MPU
COMPARATOR
POWER
FAULT
TIMERS
V1
SPI
OSC/PLL
RTC
XIN
V3P3D
GNDD
32 kHz
ICE_E
ICE I/F
XOUT
* Differential pins only on 6532D/F
02/18/2009
• 68-pin QFN package for 71M6531D/F pin-
compatible with 71M6521, 100-pin LQFP
package for 71M6532D/F, lead free
Rev 2
1