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PDF AS8002 Data sheet ( Hoja de datos )
| Número de pieza | AS8002 | |
| Descripción | Solar Photovoltaic Inverter Measurement IC | |
| Fabricantes | austriamicrosystems AG | |
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Data Sheet
AS8002
Solar Photovoltaic Inverter Measurement IC with Fast Over Current
Detection
1 General Description
2 Key Features
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.
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.
www.austriamicrosystems.com/AS8002
Revision 1.1
1 - 24
1 page  
AS8002
Data Sheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those indicated in Block Electrical Characteristics on page 6 is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min Max Units
Comments
DC supply voltage (VDD)
Input pin voltage (VIN)
Electrostatic discharge (ESD)
-0.3
-0.3
-1000
+5.0
VDD+0.3
1000
V
V
V
AVDD, DVDD
Norm: MIL 883 E method 3015
Storage temperature (Tstrg)
Lead temperature profile (Tbody)
Humidity non-condensing
-55 125 ºC
The reflow peak soldering temperature (body
temperature) specified is in accordance with IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State Surface
Mount Devices”.
5 85 %
www.austriamicrosystems.com/AS8002
Revision 1.1
5 - 24
5 Page 
AS8002
Data Sheet - Detailed Description
Figure 5. Read Mode
SCSB
SCLK
SDI
SDO
addr[6:0]
R/W
6 543 21 0
read_meas_MSB[7:0]
data_addr[7:0]
65 43 21 076 543 21 0
The interface of the AS8002 corresponds to a 4-wire SPI where each data transfer is composed of 16 bits. Each 16-bit transfer of the SDI is
divided into a 7-bit address word indicating the target register, one R/W bit indicating the operation to be done and a 8-bit word data indicating
the data to be written.
The data transferred in SDO is also composed of 16 bits. These can be divided into the 8 MSBs which correspond to the 8 MSBs of the last
conversion run by the ADC plus 8 LSBs which clock out the data that has been requested by the SDI in that same cycle. This allows for a given
read register to be addressed and read in the same 16-bit transfer.
7.4 SPI Hardware Connection
Figure 6 shows a basic interconnection diagram of an AS8002 device with a host controller. Data transmission is enabled with signal SCSB (SS/
), the serial clock is applied at pin SCLK (SCK). Data is shifted into the AS8002 via signal SDI (MOSI) and read from the AS8002 via signal SDO
(MISO).
Figure 6. AS8002 and the Controller
MOSI
MISO
SCK
SS/
SDI
SDO
SCLK
SCSB
www.austriamicrosystems.com/AS8002
Revision 1.1
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