71M6521DE-IM/F Maxim Integrated Products, 71M6521DE-IM/F Datasheet - Page 83
71M6521DE-IM/F
Manufacturer Part Number
71M6521DE-IM/F
Description
IC ENERGY METER 16K FLASH 68-QFN
Manufacturer
Maxim Integrated Products
Specifications of 71M6521DE-IM/F
Mounting Style
SMD/SMT
Package / Case
QFN-68
Program Memory Size
16 KB
Program Memory Type
Flash
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 83 of 107
- Download datasheet (3Mb)
71M6521DE/DH/FE Data Sheet
During operation, the MPU is in charge of controlling the multiplexer cycles, for example by inserting an alternate
multiplexer sequence at regular intervals using MUX_ALT. This enables temperature measurement. The polarity of
chopping circuitry must be altered for each sample. It must also alternate for each alternate multiplexer reading. This
is accomplished by maintaining CHOP_E = 00.
CE Calculations
The CE performs the precision computations necessary to accurately measure energy. These computations include
offset cancellation, products, product smoothing, product summation, frequency detection, VAR calculation, sag
detection, peak detection, and voltage phase measurement. All data computed by the CE is dependent on the
selected meter equation as given by EQU (in I/O RAM). Although EQU=0 and EQU=2 have the same element
mapping, the MPU code can use the value of EQU to decide if element 2 is used for tamper detection (typically done
by connecting VB to VA) or as a second independent element.
CE STATUS
Since the CE_BUSY interrupt occurs at 2520.6Hz, it is desirable to minimize the computation required in the interrupt
handler of the MPU. The MPU can read the CE status word at every CE_BUSY interrupt.
The CE Status Word is used for generating early warnings to the MPU. It contains sag warnings for VA as well as F0,
the derived clock operating at the fundamental input frequency. CESTATUS provides information about the status of
voltage and input AC signal frequency, which are useful for generating early power fail warnings, e.g. to initiate
necessary data storage. CESTATUS represents the status flags for the preceding CE code pass (CE busy interrupt).
Sag alarms are not remembered from one code pass to the next. The CE Status word is refreshed at every
CE_BUSY interrupt.
Rev 2
EQU
Address
0
1
2
0x7A
CE
Watt & VAR Formula
(WSUM/VARSUM)
VA IA (1 element, 2W 1φ)
with tamper detection
VA*(IA-IB)/2
(1 element, 3W 1φ)
VA*IA + VB*IB
(2 element, 4W 2φ)
Name
CESTATUS
Description
See description of CE status word below
VA*(IA-IB)/2
VAR0SUM
W0SUM/
VA*IA
VA*IA
VAR1SUM
W1SUM/
VA*IB/2
Element Input Mapping
VA*IB
VB*IB
I0SQSUM
IA-IB
IA
IA
I1SQSUM
IB
IB
IB
Page: 83 of 107
Related parts for 71M6521DE-IM/F
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
IC ENERGY METER 16K FLASH 68-QFN
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
IC ENERGY METER 16K FLASH 64LQFP
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
IC ENERGY METER 16K FLASH 64LQFP
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
Power Management Modules & Development Tools 71M6521DE DEMO BOARD M6521DE DEMO BOARD
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
MAX7528KCWPMaxim Integrated Products [CMOS Dual 8-Bit Buffered Multiplying DACs]
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 1.25Gbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Single +5V, fully integrated, 155Mbps laser diode driver.
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM Controllers with Integrated Dual MOSFET Drivers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Highly Integrated Level 2 SMBus Battery Chargers
Manufacturer:
Maxim Integrated Products
Datasheet:
Part Number:
Description:
Current Monitor and Accumulator with Integrated Sense Resistor; ; Temperature Range: -40°C to +85°C
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TSSOP 14/A°/RS-485 Transceivers with Integrated 100O/120O Termination Resis
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
QFN 16/A°/AC-DC and DC-DC Peak-Current-Mode Converters with Integrated Step
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
TDFN/A/65V, 1A, 600KHZ, SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED SWI
Manufacturer:
Maxim Integrated Products
Part Number:
Description:
Integrated Temperature Controller f
Manufacturer:
Maxim Integrated Products