71M6531D/F, 71M6532D/F
Energy Meter IC
DATA SHEET
Simplifying System IntegrationTM
October 2009
FEATURES
GENERAL DESCRIPTION
• Wh accuracy < 0.1% over 2000:1 current
range
• 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
The Teridian 71M6531D/F and 71M6532D/F are highly inte-
grated SOCs with an MPU core, RTC, FLASH and LCD driver.
Teridian’s patented Single Converter Technology® with a 22-bit
delta-sigma ADC, four analog inputs, digital temperature com-
pensation, 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.
• Four-quadrant metering
• Tamper detection (Neutral current with CT,
Rogowski or shunt, magnetic tamper input)
• 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:
A 32-kHz crystal time base for the entire system and internal bat-
tery 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 sin-
gle-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.
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
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.
• 22-bit delta-sigma ADC with 3360 Hz or
2520 Hz sample rate
• 8-bit MPU (80515), 1 clock cycle per in-
struction, 10 MHz maximum, with integrated
ICE for debug
CT/SHUNT
A
LOAD
POWER SUPPLY
NEUTRAL
CT
LOAD
B
• RTC for TOU functions with clock-rate adjust
register
• 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
• 32 kHz time base
• 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
• 68-pin QFN package for 71M6531D/F pin-
compatible with 71M6521, 100-pin LQFP
package for 71M6532D/F, lead free
ADC
V3.3
SYS
V3.3A
GNDA GNDD
IAP*
IAN*
VA
PWR MODE
CONTROL
TERIDIAN
71M6531
71M6532
IBP*
IBN*
VB
WAKE-UP
REGULATOR
VBAT
V2.5
BATTERY
TEMP
VOLTAGE REF
LCD & DIO
SENSOR
VREF
COM0..3
LCD SEG
SEG/DIO
VBIAS
RAM
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
v1.2
© 2005-2009 TERIDIAN Semiconductor Corporation
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