OM13005,598 NXP Semiconductors, OM13005,598 Datasheet - Page 187

• Manufacturer Part Number: OM13005,598
• Description: BOARD EVAL EM773 METER US PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13005,598

• Design Resources: Plug Meter Schematics, Gerber Files USB Dongle Schematics, Gerber Files
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 32-Bit
• Utilized Ic / Part: EM773FHN33,551
• Interface Type: USB
• Maximum Operating Temperature: + 150 C
• Operating Supply Voltage: 1.8 V to 3.6 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EM773, OL2381
• Other names: 568-6680

16.1 How to read this chapter
16.2 Introduction
UM10415
User manual
The EM773 Metrology Engine is available on part EM773 only.
The Metrology Engine performs electricity measurements for one second periods. The
bandwidth for the voltage and current inputs is 2 kHz. This means that for 50 Hz mains, up
to 40 harmonics can be measured, and for 60 Hz mains up to 33 harmonics.
Figure 48
connected to the Metrology Engine. In this case the current measurements are done
using a resistor Rshunt and two current measurement channels I_HIGHGAIN and
I_LOWGAIN. Voltage is measured using a resistor voltage divider and the VOLTAGE
channel.
The opamps in the measurement circuit amplify or attenuate the mains current and
voltage signals to the level required by the Metrology Engine. The opamps also apply a
DC-bias in order to enable the measurement of AC signals. Finally, the opamps can also
be used as low-pass filters to limit the input signal bandwidth to 2 kHz.
Fig 48. EM773 with external measurement circuitry connected to Metrology Engine
UM10415
Chapter 16: EM773 Metrology engine
Rev. 1 — 10 September 2010
shows the EM773 with an example of the external measurement circuitry
Mains in
Load
All information provided in this document is subject to legal disclaimers.
Rshunt
R
Rev. 1 — 10 September 2010
Supply
Power
Opamp
R
I_HIGHGAIN
I_LOWGAIN
VOLTAGE
V
SS
EM773
Metrology
engine
I2C/SPI/UART Power meter
V
DD
Data output
© NXP B.V. 2010. All rights reserved.
User manual
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