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Data Sheet
AS8002
S o l a r P h o t o v o l t a i c I n v e r t e r M e a s u r em e n t I C w i t h F a s t O v e r C u r r e n t
Detection
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.
2 Key Features
Programmable gain amplifiers to accommodate for different
sensors
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.
An external crystal oscillator is not required as a high accuracy
internal oscillator clock is available.
The on-chip voltage reference is connected to the ADC and to REF.
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.
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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
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
3 Applications
The AS8002 is suitable for PV inverter grid monitoring, Wind inverter
grid monitoring, Isolated voltage sensing, Uninterruptible Power
supplies and Power conditioners.
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12-Bit 100 kSPS ADCs for accurate voltage and current
measurement
AS8002
Data Sheet - A p p l i c a t i o n s
Figure 1. AS8002 Block Diagram
AVDD
DVDD
IOM_VOM
V1P
V1M
V2P
V2M
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TEMP
OVER
CURR
Curr
IOP_VOP
REF
REF
AS8002
OSC
12-Bit
ADC
CAL
CTRL
SCSB
SCLK
SDI
UVLO
I/F
OV TEMP
SDO
XINT
AVSS
DVSS
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Volt
AS8002
Data Sheet - C o n t e n t s
Contents
1 General Description ..................................................................................................................................................................
5 Absolute Maximum Ratings ......................................................................................................................................................
7.3 SPI Interface Data Transfer Protocol..................................................................................................................................................
Measurement Example ...................................................................................................................................................................
Measurement Control and Calibration ............................................................................................................................................
8 Application Information ...........................................................................................................................................................
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