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PDF 78M6610+PSU Data sheet ( Hoja de datos )
| Número de pieza | 78M6610+PSU | |
| Descripción | Energy Measurement Processor | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-6396; Rev 0; 7/12
78M6610+PSU
Energy Measurement Processor
for Single-Phase Power-Supply Units
DS_6610_096
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.
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The 78M6610+PSU is designed to interface to the host
processor via the UART interface. Alternatively, SPI or I2C
may also be used. Supported current sensors include
Current Transformers (CT) and Resistive Shunts.
DATA SHEET
FEATURES
• Delta-sigma ADC with precision voltage
reference
• Internal or external oscillator timing reference
• SPI, I2C, or UART interface options with
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:
o True RMS calculations for current,
voltage, line frequency, real power,
reactive power, apparent power, and
power factor
o Compensation for ambient temperature,
sensor tolerances, offsets, and EMI filter
components
o Real-time data accumulation based on an
integer number of AC cycles
o Quick calibration routines for
manufacturability
o Up to two voltage inputs for optional
connection to thermal sensors
Voltage
Sensor
Current
Sensor
Thermistor
Thermistor
Single Converter
Front End
Measurement
Processor
MUX
ADC
RAM
UART
SPI
Digital
I/O
Host
Controller
FLASH
78M6610+PSU
I2C
Rev 0
1
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
DS_6610_096
78M6610+PSU Data Sheet
1.1 Clock Management
The 78M6610+PSU can be clocked by either the trimmed internal RC oscillator or by oscillator circuitry
that relies on an external crystal. The 78M6610+PSU hardware automatically handles the clock sources
logic and distributes the clock to the rest of the device.
Upon reset or power-on, the 78M6610+PSU will automatically select the external clock, if available, after
1024 clock cycles of the internal oscillator, allowing the external crystal adequate time to start-up. After
power-on or during run-time, the 78M6610+PSU will automatically switch to the internal oscillator in the
event of a failure with the external oscillator (or crystal not mounted). This condition is also monitored by
the processor and available to the user in the ALARMS register.
The internal RC oscillator is trimmed and temperature compensated. It provides an accurate clock
source, however for applications requiring highest line frequency accuracy, the use of an external crystal
is recommended (only available in the 24-pin QFN package).
The 78M6610+PSU external clock circuitry requires a 20.000 MHz crystal. The circuitry includes two
18pF ceramic capacitors. Figure 2 shows the typical connection of the external crystal. This oscillator is
self biasing and therefore an external resistor should NOT be connected across the crystal.
18pF
20.000MHz
18pF
XIN
XOUT
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78M6610+PSU/B
Figure 2: XTAL Connection
Alternatively, an external clock signal can be utilized instead of the crystal. In this case, the external clock
should be connected to the XOUT pin while the XIN pin should be connected to GNDD.
If the external crystal is not utilized (not mounted), the XOUT pin should be connected to GNDD and the
XIN pin left unconnected.
Rev 0
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
DS_6610_096
78M6610+PSU Data Sheet
2.2 Current and Voltage RMS Calculations
The 78M6610+PSU provides true RMS measurements for both current and voltage inputs. The RMS is
obtained by performing the square sum of the instantaneous samples of voltage and current over a time
interval (commonly referred as accumulation time) and then performing a square root of the result after
dividing by the number of samples in the time interval.
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=
2�∑Nn=−01 Vn2
N
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=
2�∑Nn=−01
N
In2
iX
V
X
N-1
∑N
n=0
N-1
∑N
n=0
Figure 7: RMS Calculations
X Irms
IrOff
X
VrOff
Vrms
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Rev 0
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
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| PDF Descargar | [ Datasheet 78M6610+PSU.PDF ] | |
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