AS8002

Solar Photovoltaic Inverter Measurement IC with Fast Over Current

Detection

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Data Sheet

1 General Description

Power inverters in solar photovoltaic systems are often connected

directly to the electricity grid in order to inject the created energy into

the mains and act as an electricity supplier. This energy must comply

with certain regulations that set the standard in terms of quality and

safety which requires of accurate measurements.

The AS8002 is a highly accurate measurement IC that allows

monitoring the generated energy with low cost shunt resistors or

other sensors for the current and resistor dividers for the voltage.

This approach allows avoiding more expensive sensing devices

while achieving the required accuracy for DC and AC measurements

of current and voltage, as well as stability over the operating

temperature range of the inverter.

The 12-bit ADC samples the voltage and current and provides their

instantaneous values through an SPI interface.

The 12-bit ADC is preceded by low noise programmable gain

amplifiers in order to accommodate different sensors.

The ADC has three multiplexed inputs, offering one secondary

channel in addition to the main voltage and current.

The on-chip temperature sensor provides the inverter designer the

option of temperature compensation for any of the measured

parameters or functional blocks provided, over the full operating

temperature range of the device.

The on-chip voltage reference is connected to the ADC and to REF.

An external crystal oscillator is not required as a high accuracy

internal oscillator clock is available.

The independent over current interrupt detects a high current on the

grid and allows the processor to open the switches without waiting

for the ADC conversion.

2 Key Features

12-Bit 100 kSPS ADCs for accurate voltage and current

measurement

Programmable gain amplifiers to accommodate for different

sensors

Three multiplexed inputs to the 12-Bit ADC for secondary

measurements that require high accuracy and fast sampling

rates

On chip temperature sensor connected to one of the inputs of

the multiplexer

On-chip voltage reference with small temperature coefficient

(10ppm/K typ). This reference is available at the pin REF.

Low power on chip oscillator

SPI compatible interface

Internal registers for easy offset and gain compensation

Interrupt alerts (including Under Voltage Lock-Out and Over

Temperature)

Independent programmable over current interrupt

3 Applications

The AS8002 is suitable for PV inverter grid monitoring, Wind inverter

grid monitoring, Isolated voltage sensing, Uninterruptible Power

supplies and Power conditioners.