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78M6610+PSU
Energy Measurement Processor
for Single-Phase Power-Supply Units
DATA SHEET
? SPI, I C, or UART interface options with
o
o
DESCRIPTION
The 78M6610+PSU is a single-core energy measurement
processor for single-phase power supplies. It is designed
specifically for real-time monitoring at the input of AC/DC
power converters used in data centers and IT server rooms.
It is available in either a 24-pin QFN or 16-pin TSSOP
package for optimal space savings.
The 78M6610+PSU provides four analog inputs (two
differential and two single ended) for interfacing to voltage,
current, and two optional temperature sensors. Scaled
voltages from the sensors are fed to the single converter
front-end utilizing a high-resolution delta-sigma converter.
An embedded 24-bit energy measurement processor (EMP)
and firmware performs all the necessary computation,
compensation, and data formatting for accurate, real-time
reporting to the host. With integrated flash memory, the
78M6610+PSU is a completely autonomous solution
capable of storing nonvolatile data such as calibration
coefficients and input configuration settings.
FEATURES
? Delta-sigma ADC with precision voltage
reference
? Internal or external oscillator timing reference
2
configurable I/O pins for alarm signaling,
address pins, or user control
? 24-bit energy measurement processor (EMP)
with integrated firmware and flash memory
provides the user with:
True RMS calculations for current,
voltage, line frequency, real power,
reactive power, apparent power, and
power factor
Compensation for ambient temperature,
sensor tolerances, offsets, and EMI filter
components
processor via the UART interface. Alternatively, SPI or I C
The 78M6610+PSU is designed to interface to the host
may also be used. Supported current sensors include
Current Transformers (CT) and Resistive Shunts.
2
o
o
o
Real-time data accumulation based on an
integer number of AC cycles
Quick calibration routines for
manufacturability
Up to two voltage inputs for optional
connection to thermal sensors
Voltage
Sensor
Single Converter
Front End
Measurement
Processor
UART
Current
Sensor
Thermistor
MUX
ADC
RAM
SPI
Digital
I/O
Host
Controller
Thermistor
FLASH
I2C
78M6610+PSU
19-6396; Rev 1; 2/13
Rev 1
1
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