SA9602E(2017) 查看數據表（PDF） - South African Micro Electronic Systems

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SA9602E
(Rev.:2017)

Single Phase Unidirectional Power/Energy Metering IC with Instantaneous Pulse Output

South African Micro Electronic Systems 

SA9602E

FUNCTIONAL DESCRIPTION

The SA9602E is a CMOS mixed signal integrated circuit,

which performs power/energy calculations across a power

range of 500:1, to an overall accuracy of Class 1.

The SA9602E in is a direct replacement for the SA9102E with

the advantage of no external loop capacitors.

The integrated circuit includes all the required functions for

single phase power and energy measurement such as two

oversampling A/D converters for the voltage and current

sense inputs, power calculation and energy integration.

Internal offsets are eliminated through the use of cancellation

procedures. The SA9602E generates pulses, the frequency

of which are proportional to the power consumption. Two

frequency outputs (FOUT1 and FOUT2) are available, with

additional frequency options available on request. The pulse

rate follows the instantaneous power consumption measured.

POWER CALCULATION

In the application circuit (see Figure 3), the voltage drop

across the shunt (RSH) will be between 0 and 16mVRMS (0 to

80A through a shunt resistor of 200μ). This voltage is

converted to a current of between 0 and 16μARMS, by means

of resistors R1 and R2. The current sense inputs saturate at

an input current of ±25μA peak.

VDD

N

Power

Supply

L

GND

VSS

RSH

R1

R2

U1

VDD

IIN

VDD

IIP

OSC1

R3

R5

OSC2

IVP

FOUT1

Pulse Output 1

R4

AGND FOUT2

GND

TEST

Pulse Output 2

VREF

VSS

N

SA9602E

P1

R6

L

GND

VSS

Figure 3: Application Circuit

For the voltage sensor input, the mains voltage (220VAC) is

divided down through a divider (R3, R4 and P1) to 14V. The

current into the A/D converter input is set at 14μARMS at

nominal mains voltage, via resistor R5 (1M). P1 may be

varied for calibration purposes.

In this configuration, with a mains voltage of 220V and a

current of 80A, the output frequency of the SA9602E power

meter chip on FOUT1 is 1160Hz. In this case, one pulse will

correspond to an energy consumption of 17.6kW/1160Hz =

15.17Ws. The output frequency on FOUT2 is FOUT1/290

(i.e. the frequency output at FOUT1 divided by 290).

ANALOG INPUT CONFIGURATION

The input circuitry of the current and voltage sensor inputs is

illustrated in Figure 4. These inputs are protected against

electrostatic discharge through clamping diodes. The

feedback loops from the outputs of the amplifiers AI and AV

generate virtual shorts on the signal inputs. Exact

duplications of the input currents are generated for the analog

signal processing circuitry.

VDD

IIP

CURRENT

SENSOR

INPUT

VSS

VDD

IIN

VSS

VDD

IVP

VOLTAGE

SENSOR

INPUT

VSS

AI

AV

CURRENT

CHANNEL

ADC

VOLTAGE

CHANNEL

ADC

AGND

Figure 4: Internal analog input configuration

SPEC-3117 (REV. 5)

4/10

29-09-2017

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