FS7755

Rev. 1.1

3/22

1.

General Description

The FS7755 is a high accuracy electrical energy measurement IC. The part specifications surpass the

accuracy requirements as quoted in the IEC1036 standard.

The only analog circuitry used in the FS7755 is in the ADCs and reference circuit. All other signal processing

(e.g., DSP) is carried out in the digital domain. This approach provides superior stability and accuracy over

extremes in environmental conditions and over time.

The FS7755 supplies average real power information on the low-frequency outputs F1 and F2. These logic

outputs may be used to directly drive an electromechanical counter or interface to an MCU. The CF logic output

gives instantaneous real power information. This output is intended to be used for calibration purposes or for

interfacing to an MCU.

be reset and no pulses will be issued on F1, F2, and CF.

An internal no load threshold ensures that the FS7755 does not exhibit any creep when there is no load.

The FS7755 is available in a 24-lead SSOP package.

2.

Features

High Accuracy, Surpasses 50Hz/60Hz IEC 687/1036

Less than 0.1% Error over a Dynamic Range of 500 to 1

Synchronous outputs with CF, F1 and F2

The FS7755 Supplies Average Real Power on the Impulse Outputs F1 and F2

The High-Frequency Output CF Is Intended for Calibration and Supplies Instantaneous Real Power

The Logic Output REVP Can Be Used to Indicate a Potential Miswiring or Negative Power

Direct Drive for Electromechanical Counters and Two Phase Stepper Motors (F1 and F2)

A PGA (Programmable Gain Amplifier) in the Current Channel Allows the Use of Small Values of Shunt and

Burden Resistance

Proprietary ADCs and DSP Provide High Accuracy over Large Variations in Environmental Conditions and

Time

On-Chip Power Supply Monitoring

On-Chip Creep Protection (No Load Threshold)

On-Chip Reference 2.5V ± 8% (30ppm/℃ Typical) with External Overdrive Capability

Single 5V Supply, Low Power (15mW Typical)

Low Cost CMOS Process

3.

Applications

Single Phase Electronic Energy Meter

4.

Ordering Information

FS7755-IS

Package Type

S: SSOP-24

Operating Temperature Range

I: Industrial Standard