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AS8002 solar photovoltaic inverter measure ment ic with fast over current detection www.austriamicrosystems.com/AS8002 revision 1.1 1 - 24 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 a ccurate 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. ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 2 - 24 AS8002 data sheet - applications figure 1. AS8002 block diagram AS8002 ref ref osc ctrl uvlo ov temp over curr temp 12-bit adc volt curr cal i/f scsb sclk sdi sdo xint iop_vop iom_vom v1p v1m v2p v2m avss dvss avdd dvdd ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 3 - 24 AS8002 data sheet - contents contents 1 general description ......................................................................................................... ......................................................... 1 2 key features............................................................................................................................................................................. 1 3 applications............................................................................................................................................................................... 1 4 pin assignments ....................................................................................................................................................................... 4 4.1 pin descriptions.................................................................................................................................................................................... 4 5 absolute maximum ratings .................................................................................................... .................................................. 5 6 electrical characteristics.................................................................................................. ......................................................... 6 6.1 operating conditions...................................................................................................... ...................................................................... 6 6.2 block electrical characteristics .......................................................................................... .................................................................. 6 7 detailed description........................................................................................................ .......................................................... 9 7.1 operating modes ........................................................................................................... ..................................................................... 10 7.2 spi interface....................................................................................................................................................................................... 10 7.3 spi interface data transfer protocol...................................................................................... ............................................................ 10 7.4 spi hardware connection ................................................................................................... ........................................................... 11 7.5 spi timing ................................................................................................................ .......................................................................... 12 7.6 measurement example ....................................................................................................... ............................................................ 13 7.7 measurement control and calibration ....................................................................................... ..................................................... 14 7.8 interrupts................................................................................................................ ......................................................................... 14 7.9 register map table........................................................................................................ ..................................................................... 15 7.10 register description ......................................................................................................................................................................... 16 8 application information ..................................................................................................... ...................................................... 21 8.1 application hints......................................................................................................... ........................................................................ 21 9 package drawings and markings ............................................................................................... ............................................ 22 10 ordering information....................................................................................................... ...................................................... 24 ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 4 - 24 AS8002 data sheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) 4.1 pin descriptions note: pin number assignment is likely to change. table 1. pin descriptions pin name pin number pin type description iop_vop 1 analog pin analog input channel 0. positive input of the differential analog input. iom_vom 2 analog pin analog input channel 0. negative input of the differential analog input. v1p 3 analog pin analog input channel 1. positive input of the differential analog input. v1m 4 analog pin analog input channel 1. negative input of the differential analog input. v2p 5 analog pin analog input channel 2. positive input of the differential analog input. v2m 6 analog pin analog input channel 2. negative input of the differential analog input. ref 7 analog pin reference positive input voltage. avss 8 supply pin ground reference for the analog circuitry. dvss 9 supply pin ground reference for the digital circuitry. xint 10 digital input/output pin interrupt pin, active low sdo 11 digital output pin serial peripheral interface (spi): serial data output sdi 12 digital input pin serial peripheral interface (spi): serial data input sclk 13 digital input pin serial peripheral interface (spi): serial clock scsb 14 digital input pin serial peripheral interface (spi): serial chip select (active low) dvdd 15 supply pin digital positive supply avdd 16 supply pin analog positive supply avss pad supply pin ground reference for the analog circuitry. AS8002 qfn16 4x4x0.9 sdi sdo xint dvss avdd dvdd scsb scl v2p v2m ref avss iop_vop iom_vom v1p v1m ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 5 - 24 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 (v dd ) -0.3 +5.0 v avdd, dvdd input pin voltage (v in )- 0 . 3v dd +0.3 v electrostatic discharge (esd) -1000 1000 v norm: mil 883 e method 3015 storage temperature (t strg ) -55 125 oc lead temperature profile (t body ) 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?. humidity non-condensing 5 85 % ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 6 - 24 AS8002 data sheet - electrical characteristics 6 electrical characteristics 6.1 operating conditions 6.2 block electrical characteristics avdd=3.0v to 3.6v, t amb = -40 to +125oc. typical values at t amb = +25oc and avdd=3.3v (unless otherwise specified). table 3. operating conditions symbol parameter conditions min typ max units avdd positive analog supply voltage 3.0 3.3 3.6 v avss negative analog supply voltage 00v a - d difference of supplies avdd ? dvdd avss ? dvss -0.1 0.1 v dvdd positive digital supply voltage 3.0 3.3 3.6 v dvss negative digital supply voltage 00v t amb ambient temperature -40 25 125 oc i supp supply current 5ma table 4. block electrical characteristics symbol parameter conditions min typ max units adc dc accuracy res resolution 12 bits inl integral nonlinearity -0.99 +0.99 lsb dnl differential nonlinearity guaranteed no missed codes to 12 bits -0.99 +0.99 lsb ofs offset error 0.6 4 lsb ofsm offset error match 0.1 lsb gain gain error 4 lsb gainm gain error match 0.1 lsb adc dynamic specifications f in =10 khz sine wave input sinad signal to noise = distortion ratio f in = 10khz 71 db snr signal-to-noise ratio 72 db thd total harmonic distortion -78 db sfdr spurious-free dynamic range 84 db ccisol channel-to-channel isolation f in = 40khz -79 db fpbw full power bandwidth at 3db 35 mhz flbw at 0.1db 3.6 adc analog inputs of the analog-to-digital converter vx+ ? vx- differential input voltage ranges -v ref v ref v vcmin input common mode voltage v ref /2 v dd - v ref /2 v aileak dc leakage current -1 +1 a aiizt input capacitance track mode tbd pf aiizh hold mode tbd pf adc conversion rate t conv conversion time running from the internal oscillator 10 s ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 7 - 24 AS8002 data sheet - electrical characteristics t acquisition track-and-hold acquisition time tbd s tput throughput rate 100 ksps aperture aperture delay 4ns jitter aperture jitter 50 ps reference output rfrng range typical accuracy tbd% 2.5 v rftc internal reference drift 10 ppm/oc programmable gain amplifiers ampgain0 gain channel 0 programmable 2 64 v/v | vv0_i0 | input level 0 differential, with gain of 64 14 20 mv p ampgain1 gain channel 1 programmable 2 c 8 v/v | vv1 | input level 1 differential, with gain of 6 150 212 mv p ampoffed offset error drift -20 20 v ampgained gain error drift -0.1 0.1 % ampthd total harmonic distortion tbd temperature sensor tempaerr absolute error (trimmed) -5 +5 oc temprerr relative error (trimmed) -3 +3 oc temprng temperature range -40 85 oc tempres resolution 0.75 oc/lsb internal oscillator oscfreq frequency 10 mhz oscerror relative error -10 +10 % over current ovcurrde lay reaction time from chip input to output 2 s ovcurrer ror relative error for threshold lower than 50mv -20 +20 % for threshold higher than 50mv -10 +10 under voltage lock out uvlohi high threshold 2.85 v uvlohyst hysteresis 0.1 v digital inputs v ih input high voltage 0.7xdvd d v v il input low voltage 0.3xdvd d v i in input current v in =0v or dvdd -1 +1 a c in input capacitance 15 pf digital outputs v oh output high voltage i source = 200 a; dvdd = 3 to 3.6v dvdd - 0.2 v v ol output low voltage i sink = 200 a 0.4 v table 4. block electrical characteristics symbol parameter conditions min typ max units ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 8 - 24 AS8002 data sheet - electrical characteristics coding output coding two?s complem ent power requirements v dd positive supply voltage 33.6v i dd avdd= 3v, f sample = 100ksps input amplifier off 650 a avdd = 3v, f sample = 100ksps input amplifier on 5ma full shutdown mode (off mode) 1 a table 4. block electrical characteristics symbol parameter conditions min typ max units ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 9 - 24 AS8002 data sheet - detailed description 7 detailed description figure 3 presents a typical application schematic for the AS8002 used for voltage and current measurement of a device connected to the grid such a solar inverter or microinverter. the external circuitry comprises the power supply unit that is connected to the grid signal and that generates a stable dc volt age which is the supply of the AS8002 and the digital isolation. both current and voltage are scaled down and filtered prior to be sensed by the AS8002. in the case of the voltage, a resistor divider is enough to scale down the voltage. in the case of the current, a low ohmic shunt resi stor should be used. the value of this shunt resistor should be calculated in order not to saturate the inputs of the AS8002 but to provide a good s ignal to noise ratio. it is also important to minimize the value of the shunt resistor to lower the losses and increase the overall efficiency. unlike commonly used sensing methods, the AS8002 is connected to the same potential level as the grid, which allows using a low cost shunt resistor as the sensing device. the isolation is achieved by means of a digital isolator which should be able to handle a data rate of up to 2mbps. this sensing solution has several advantages compared to other common solutions, like the stability over temperature, accuracy of the measurements and allowed bandwidth. all these lead to an accurate control of the dc-ac converter with low dc injection currents . figure 3. typical application circuit ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 10 - 24 AS8002 data sheet - detailed description 7.1 operating modes when the supply voltage is below the threshold v por , the AS8002 is in reset mode. once the supply voltage is higher than v por , the AS8002 goes into off mode during its initialization time t init . in this mode, the current consumption is reduced and only the control register can be read or written. once the register bit chip_en has been set to 1, the chip goes into on mode and can be normally used after t wakeup . the chip can go immediately back to off mode by setting chip_en to 0. 7.2 spi interface the 16-bit spi interface enables read / write access to the register blocks and is compatible to a standard micro controller in terface, using spi mode 3 (sclk initial state = high, data latched with rising edge of sclk). the spi module is active as soon as pin scsb is pulled low. the AS8002 is then ready to read the 8-bit spi address on the sdi i nput with every rising edge of sclk and writes on its sdo output with the falling edge of sclk. after 16 clock cycles scsb has to be set back t o high status in order to reset the interface for the next read/write cycle. the address is split into an upper 7 bit address (addr[0?6]) and a lower 8 th bit (r/w) containing the read/write information. writing data to the AS8002 is established by setting the r/w bit to 0. the 8 bits following this bit on sdi contain the data to be written into the address specified in the first 8 bits. reading data is established by setting the r/w bit to 1. the 8 bits following this bit on sdo contain the data from the address specified in the first 8 bits on sdi. 7.3 spi interface data transfer protocol figure 4. write mode table 5. characteristics parameter description min max unit v por por threshold voltage 2.6 v t init initialization time 3 ms t wakeup wake up time 300 s 65 0 123 46 5 0 1234 7 65 0 1234 7 65 0 1234 addr[6:0] read_meas_msb[7:0] r/w data[7:0] read_meas_lsb[7:0] scsb sclk sdi sdo ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 11 - 24 AS8002 data sheet - detailed description figure 5. read mode the interface of the AS8002 corresponds to a 4-wire spi where each data transfer is composed of 16 bits. each 16-bit transfer o f 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 w ord 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 hardwa re connection figure 6 shows a basic interconnection diagram of an AS8002 device with a host controller. data transmission is enabled with signal scs b (ss/ ), the serial clock is applied at pin sclk (sck). data is shifted into the AS8002 via signal sdi (mosi) and read from the as800 2 via signal sdo (miso). figure 6. AS8002 and the controller 65 0 1234 65 0 1234 7 65 0 1234 addr[6:0] read_meas_msb[7:0] r/w data_addr[7:0] scsb sclk sdi sdo mosi miso sck ss/ sdo sdi sclk scsb AS8002 uc ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 12 - 24 AS8002 data sheet - detailed description 7.5 spi timing figure 7. timing diagram note: the data on sdo initially reflects the data corresponding to the previous command on sdi. hence, in write mode, the full 16-bit data of a measurement can be read. table 6. timing characteristics parameter description min max unit t l time between scsb falling edge and sck rising edge 350 ns t sclk serial clock period 100 ns t sclkl low period of serial clock 50 ns t sclkh high period of serial clock 50 ns t h time between last falling edge of sck and rising edge of scsb t sck / 2 ns t xssh high time of scsb between two transmissions 350 ns t sdi data input valid to rising clock edge 20 ns t sdo sclk falling edge to data output valid 20 ns scsb (input) sclk (input) sdi (input) sdo (output) t sclk t l t sdi t sdo t oz t oz t h t xssh t sclkl t sclkh data[15] data[15] data[14] data[14] data[0] data[0] ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 13 - 24 AS8002 data sheet - detailed description 7.6 measurement example the following example shows a simple way to alternately read the voltage and current values: bits [b2:b0] in addr 03h cont rol the adc inpu t multiplexer: 1. select the current channel input (iom, iop) : 0610h - set the address [a6:a0] to 03h, - set the r/w bit to 0 (write mode) and the data to 10h (adc_en = 1, mux_sel = 0 ) - in parallel to writing the 16-bit data on sdi, a set of 16-bit data can be read on sdo, which contains the data from the seco nd to last command. 2. select the voltage channel input (v1m, v1p) : 0611h - set the address [a6:a0] to 03h, - set the r/w bit to 0 (write mode) and the data to 11h (adc_en = 1, mux_sel = 1 ) - in parallel to writing the 16-bit data on sdi, a set of 16-bit data can be read on sdo, which contains the data from the seco nd to last command. 3. change the input multiplexer back to current channel input (iom, iop) : 0610h - repeat the sequence 1 above: addr = 03h, data = 10h, - the 16-bit current input data from the second to last invoked command (1 above) can be read on sdo. 4. loop sequences 2 and 3 note: in sequence 2, the 16-bit voltage input data from the second to last command can be read on sdo. figure 8. measurement diagram note: the 16-bit input data from the voltage and current measurements contain the adc data in the lower 12 bits and two status bits i n the upper 4 bits (see register map table on page 15) . name addr default content b7 b6 b5 b4 b3 b2 b1 b0 input multiplexer 03h 00h adc_en mux_sel[2:0] 0: current channel pga output 1: voltage channel pga output set mux to current measurement set mux to voltage measurement set mux to current measurement set mux to voltage measurement sdi msb 0610h lsb data from previous command data from previous command read current input value read voltage input value sdo msb lsb msb lsb msb lsb msb lsb transmission 1 transmission 2 transmission 3 transmission 4 1) 2) 3) 4)=2) msb 0611h lsb msb 0610h lsb msb 0611h lsb ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 14 - 24 AS8002 data sheet - detailed description 7.7 measurement control and calibration the conversion starts on scsb falling edge when adc_en is a 1. the value of the result of the conversion can be read at the next spi write command 10s later. figure 9. adc burst mode read_meas will be transferred to the current, voltage or auxiliary measurement upon mux_sel[2:0] value ? curr_meas, volt_meas or aux_meas. calibration is done according to the formulas: for current channel: read_meas = adc_meas * (1024 + pga_curr_gain_cal ) / 1024 (eq 1) for voltage channel: read_meas = adc_meas * (1024 + pga_volt_gain_cal ) / 1024 (eq 2) for auxiliary channel: read_meas = adc_meas * (1024 + aux_gain_cal ) / 1024 (eq 3) note: the raw adc results are also available in the registers and are called adc_meas[11:0] 7.8 interrupts when an over current, an under voltage or an over temperature occurs the bit warning_detected is set to 1. the interrupt state is present on interrupt_detected and on the pin xint. the statuses are available in the register interrupt status. it contains the bits over_currrent_int_en , under_voltage_int_en , over_temp_int_en . the generation of the interrupt can be enabled or disabled in the register ?interrupt enable?. it contains the bits over_currrent_int_i , under_voltage_int_i, over_temp_int_i. values of the register interrupt status are kept until this register is read. table 7. current and voltage measurements name content b15 b14 b13 b12 b11:b0 current measurement 0 warning_detected interrupt_detected x curr_meas voltage measurement 0 warning_detected interrupt_detected x volt_meas channel_1 channel_2 channel_3 channel_1 channel_2 not updated not updated scsb channel measured channel read ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 15 - 24 AS8002 data sheet - detailed description 7.9 register map table note: highlighted registers are read only registers (bits). table 8. register map name addr default content b7 b6 b5 b4 b3 b2 b1 b0 control 01h 00h over_ current_ch annel over_ current_ en adc_ref_ en pga_ volt_en pga_ curr_en temp_ sensor_ en chip_en pga gain 02h 00h pga_volt_gain[1:0] pga_curr_gain[4:0] input multiplexer 03h 00h adc_en mux_sel[2:0] over temperature threshold 04h ffh over_temp_thres[7:0] interrupt enable 05h 00h over_ current_int _en under_ voltage_ int_en over_ temp_int_ en over current range 06h ffh over_current_range[7:0] current measurement msb 10h 00h 0 warning_ detected interrupt_ detected x curr_meas[11:8] current measurement lsb 11h 00h curr_meas[7:0] voltage measurement msb 12h 00h 0 warning_ detected interrupt_ detected x volt_meas[11:8] voltage measurement lsb 13h 00h volt_meas[7:0] auxiliary measurement msb 14h 00h 0 warning_ detected interrupt_ detected x aux_meas[11:8] auxiliary measurement msb 15h 00h aux_meas[7:0] temperature measurement 16h 00h temp[7:0] interrupt status 17h 00h over_ current_i under_ voltage_i over_ temp_i asic id 1 18h 02h 0 0 0 0 0 0 1 0 asic id 2 19h 5xh 0 1 0 1 x x x x raw adc results msb 1ah 00h 0 warning_ detected interrupt_ detected x adc_meas[11:8] raw adc results lsb 1bh 00h adc_meas[7:0] pga current gain calibration 3ah 00h pga_curr_gain_cal[7:0] pga voltage gain calibration 3bh 00h pga_volt_gain_cal[7:0] auxiliary channel gain calibration 3ch 00h aux_gain_cal[7:0] ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 16 - 24 AS8002 data sheet - detailed description 7.10 register description table 9. 01h address: 01h control register controls the power on and o ff of the internal blocks bit bit name default access description 0 chip_en 0h r/w 0: chip in complete power off 1: chip on 1 temp_sensor_en 0h r/w 0: temperature sensor disabled 1: temperature sensor enabled 2 pga_curr_en 0h r/w 0: current channel pga disabled 1: current channel pga enabled 3 pga_volt_en 0h r/w 0: voltage channel pga disabled 1: voltage channel pga enabled 4 adcref_en 0h r/w 0: internal adc reference voltage off 1: internal adc reference voltage on note: this bit must be set to allow adc measurements. 5 over_current_en 0h r/w 0: over current detector disabled 1: over current detector enabled 6 over_current_channel 0h r/w 0: over current detector connected to inputs iop_vop and iom_vom 1: over current detector connected to inputs v2p and v2m table 10. 02h address: 02h pga gain register controls the gain of the current and voltage channel pgas bit bit name default access description 4:0 pga_curr_gain 00h r/w gain for current channel is given by the formula: 2*pga_curr_gain+2 (eq 4) 7:6 pga_volt_gain 0h r/w gain for voltage channel is given by the formula: 2*pga_volt_gain+2 (eq 5) table 11. 03h address: 03h input multiplexer register controls the adc and select th e channel to be converted bit bit name default access description 2:0 mux_sel 00h r/w select the input to be converted: 0: current channel pga output 1: voltage channel pga output 2: v2p and v2m 3: avdd and avss 4: iop_vop and iom_vom 5: v1p and v1m 6: reserved 7: reserved 4 adc_en 0h r/w enable the adc conversion that will start on the next scsb falling edge ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 17 - 24 AS8002 data sheet - detailed description table 12. 04h address: 04h over temperature threshold register set the over temperature threshold value bit bit name default access description 7:0 over_temp_thres ffh r/w over temperature detection is triggered when temp value is higher than over_temp_thres table 13. 05h address: 05h interrupt enable register separately enables the interrupts bit bit name default access description 0 over_temp_int_en 0h r/w 0: interrupt due to over temperature is disabled 1: interrupt due to over temperature is enabled 1 under_voltage_int_en 0h r/w 0: interrupt due to under voltage is disabled 1: interrupt due to under voltage is enabled 2 over_current_int_en 0h r/w 0: interrupt due to over current is disabled 1: interrupt due to over current is enabled table 14. 06h address: 06h over current range register set the over current comparators absolute threshold voltage bit bit name default access description 7:0 over_current_range ffh r/w the threshold voltage is given by the formula: over_current_range*1m (eq 6) where: over_current_range should be higher than 10h table 15. 10h address: 10h current measurement msb register gives measured value of current (msb) a nd status of warnings and interrupts bit bit name default access description 3:0 curr_meas[11:8] 0h r msb of current channel measurement, value is given as 2?s complement number by the formula: i=curr_meas*1.22m / (rshunt*curr_gain) (eq 7) 5 interrupt detected 0h r same value as xint (complemented) 0: no interrupt detected 1: interrupt is detected 6 warning detected 0h r over temperature, under voltage or over current detected 0: no warning detected 1: warning detected ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 18 - 24 AS8002 data sheet - detailed description table 16. 11h address: 11h current measurement lsb register gives measured value of current (lsb) bit bit name default access description 7:0 curr_meas[7:0] 0h r lsb of current channel measurement, value is given as 2?s complement number by the formula: i=curr_meas*1.22m / (rshunt*curr_gain) (eq 8) table 17. 12h address: 12h voltage measurement msb register gives measured value of voltage (msb) and status of warnings and interrupts bit bit name default access description 3:0 volt_meas[11:8] 0h r msb of voltage channel measurement, value is given as 2?s complement number by the formula: volt_meas*1.22m / volt_gain (eq 9) 5 interrupt detected 0h r same value as xint (complemented) 0: no interrupt detected 1: interrupt is detected 6 warning detected 0h r over temperature, under voltage or over voltage detected 0: no warning detected 1: warning detected table 18. 13h address: 13h voltage measurement lsb register gives measured value of voltage (lsb) bit bit name default access description 7:0 volt_meas[7:0] 0h r lsb of voltage channel measurement, value is given as 2?s complement number by the formula: volt_meas*1.22m / volt_gain (eq 10) table 19. 14h address: 14h auxiliary measurement msb register gives measured value of auxiliary channel (msb) and status of warnings and interrupts bit bit name default access description 3:0 aux_meas[11:8] 0h r msb of auxiliary channel measurement, value is given as 2?s complement number by the formula: aux_meas*1.22m (eq 11) 5 interrupt detected 0h r same value as xint (complemented) 0: no interrupt detected 1: interrupt is detected 6 warning detected 0h r over temperature, under auxiliary or over auxiliary detected 0: no warning detected 1: warning detected ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 19 - 24 AS8002 data sheet - detailed description table 20. 15h address: 15h auxiliary measurement lsb register gives measured value of auxiliary channel (lsb) bit bit name default access description 7:0 aux_meas[7:0] 0h r lsb of auxiliary channel measurement, value is given as 2?s complement number by the formula: aux_meas*1.22m (eq 12) table 21. 16h address: 16h temperature measurement register gives measured value of temperature bit bit name default access description 7:0 temp 0h r temperature value (in c) is given by the formula: 92+temp*3/4 (eq 13) table 22. 17h address: 17h interrupt status register gives status of each interrupt source bit bit name default access description 0 over_temp_i 0h r 0: over temperature not detected 1: over temperature detected 1 under_voltage_i 0h r 0: under voltage not detected 1: under voltage detected 2 over_current_i 0h r 0: over current not detected 1: over current detected table 23. 18h address: 18h asic id 1 register provides chip identification bit bit name default access description 7:0 asic_id 02h r chip indentification table 24. 19h address: 19h asic id 2 register provides chip version number bit bit name default access description 7:0 asic_version 5xh r 50h: chip version 0 51h: chip version 1 ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 20 - 24 AS8002 data sheet - detailed description table 25. 1ah address: 1ah raw adc results msb register gives measured value of the adc (msb) and status of warnings and interrupts bit bit name default access description 3:0 adc_meas[11:8] 0h r msb of raw adc measurement, value is given as 2?s complement number by the formula: adc_meas*1.22m (eq 14) 5 interrupt detected 0h r same value as xint (complemented) 0: no interrupt detected 1: interrupt is detected 6 warning detected 0h r over temperature, under voltage or over current detected 0: no warning detected 1: warning detected table 26. 1bh address: 1bh raw adc results lsb register gives measured value of raw adc (lsb) bit bit name default access description 7:0 adc_meas[7:0] 0h r lsb of raw adc measurement, value is given as 2?s complement number by the formula: adc_meas*1.22m (eq 15) table 27. 3ah address: 3ah pga current gain calibration register set value of correction coefficient for current measurement bit bit name default access description 7:0 pga_curr_gain_cal 00h r/w correct the measured current value multiplying it by the following factor, where pga_curr_gain_cal is a number defined as 2?s complement: (1024 + pga_curr_gain_cal) / 1024 (eq 16) table 28. 3bh address: 3bh pga voltage gain calibration register set value of correction coefficient for voltage measurement bit bit name default access description 7:0 pga_volt_gain_cal 00h r/w correct the measured voltage value multiplying it by the following factor, where pga_volt_gain_cal is a number defined as 2?s complement: (1024 + pga_volt_gain_cal) / 1024 (eq 17) table 29. 3ch address: 3ch auxiliary channel gain calibration register set value of correction coefficient for auxiliary measurement bit bit name default access description 7:0 aux_gain_cal 00h r/w correct the measured value of the auxiliary channel multiplying it by the following factor, where aux_gain_cal is a number defined as 2?s complement: (1024 + aux_gain_cal) / 1024 (eq 18) ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 21 - 24 AS8002 data sheet - application information 8 application information table 30 provides examples of gain selection of channel 1 for different shunt resistors and maximum rms currents. 8.1 application hints grounding and layout. the analog and digital supplies of the AS8002 (avdd, dvdd, avss, dvss) are independent and separately pinned out to minimize coupling between the analog and digital sections of the device. the printed circuit board (pcb) that hou ses the AS8002 should be designed such that the analog and digital sections are separated and confined to certain areas on the board. this des ign facilitates the use of ground planes that can be easily separated. to provide optimum shielding for ground planes, a minimum etch technique is generally best. all vss pins of the AS8002 should be sunk in the ground plane. digital and analog ground planes should be joined in only one spot. if the AS8002 is in a system where multiple d evices require an avss and dvss connection, th is connection should st ill be made at one point only; a star ground point that sh ould be establishe d as close as possible to the ground pins on the AS8002. avoid running digital lines under the device as this couples noise into the chip. however, the analog ground plane should be al lowed to run under the AS8002 to avoid noise coupling. the power supply lines to the AS8002 should use as large trace width as possible to provide low impedance paths and reduce the effects of glitches on the power supply line. likewise, the positive supply pins avdd and dvdd should be connected only at one common star point close the output of the powe r supply. for best performance of the analog blocks of the AS8002, it is important to have a clean, noise-free supply voltage at avdd. to avoid radiating noise to other sections of the board, fast switching signals, such as clocks, should be shielded with digita l ground, and clock signals should never run near the analog inputs. avoid crossover of digital and analog signals. to reduce the effects of feedth rough within the board, traces on opposite sides of the board should run at right angles to each other. a microstrip technique is the best metho d but is not always possible with a double sided board. in this technique, the component side of the board is dedicated to ground planes, while sig nals are placed on the opposite side. good decoupling is also important. all analog supplies should be decoupled with 10f ceramic capacitors in parallel with 0.1f capacitors to gnd. refer to typical application circuit (page 9) . to achieve the best results from these decoupling components, they must be placed as close as possible to the device the 0.1f capacitors should have low effective series resistance (esr) and low effective series induc tance (esi), such as common ceramic types or surface-mount types. these low esr and esi capacitors provide a low impedance path to ground at high frequencies to handle transient currents due to internal logic switching. table 30. gain selection shunt resistor value sensing rms current (a) recommended linear gain for channel 1 for adc to work in 80% of dynamic range 7.5 m 1.5 gain1 = 64 10 m 1.5 gain1 = 48 5 m 3 gain1 = 48 7.5 m 3 gain1 = 32 10 m 3 gain1 = 24 5 m 6 gain1 = 24 7.5 m 6 gain1 = 16 10 m 6 gain1 = 12 ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 22 - 24 AS8002 data sheet - pack age drawings and markings 9 package drawings and markings the device is available in a 16-pin qfn (4x4x0.9mm) package. figure 10. 16-pin qfn (4x4x0.9mm) package notes: 1. dimensioning and tolerancing conform to asme y14.5m-1994 . 2. all dimensions are in millimeters, angles are in degrees. 3. dimension b applies to metallized terminal and is measured between 0.25 and 0.30mm from terminal tip. dimension l1 represen ts terminal full back from package edge up to 0.1mm is acceptable. 4. coplanarity applies to the exposed heat slug as well as the terminal. 5. radius on terminal is optional. #1 2 3 4 56 7 8 9 10 11 12 16 15 14 13 symbol min typ max a 0.75 0.85 0.95 a1 0.203 ref b 0.25 0.30 0.35 d 4.00 bsc e 4.00 bsc d2 2.30 2.40 2.50 e2 2.30 2.40 2.50 symbol min typ max e 0.65 bsc l 0.40 0.50 0.60 l1 0.10 p 45o bsc aaa 0.15 ccc 0.10 ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 23 - 24 AS8002 data sheet - revision history revision history note: typos may not be explicitly mentioned under revision history. revision date owner description 1.0 14 may, 2010 jja initial revision 1.1 25 aug, 2010 spo updated the following in register map (page 15) : 1) register bit b4 at address 01 (previously under_voltage_en) is now adc_ref_en 2) asic id 2 register value is now 5xh ams ag technical content still valid
www.austriamicrosystems.com/AS8002 revision 1.1 24 - 24 AS8002 data sheet - ordering information 10 ordering information the devices are available as the standard products shown in table 31 . note: all products are rohs compliant and pb-free. buy our products or get free samples online at icdirect: http://www.austriamicr osystems.com/icdirect for further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicros ystems.com/distributor copyrights copyright ? 1997-2010, austriamicrosystems ag, tobelbaderstrasse 30, 8141 unterpremstaetten, austria-europe. trademarks registe red ?. all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by austriamicrosystems ag are covered by the warranty and patent indemnification provisions appearing in its term of sale. austriamicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth he rein or regarding the freedom of the described devices from patent infringement. austriamicrosystems ag reserves the right to change specificatio ns and prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with austriamic rosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temper ature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems ag for each application. for shipments of les s than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag tobelbaderstrasse 30 a-8141 unterpremstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors and representatives, please visit: http://www.austriamicrosystems.com/contact table 31. ordering information ordering code description delivery form package AS8002 aqfp temperature: -40oc to 125oc tape & reel in dry pack; 6000 pieces / reel 16-pin qfn (4x4x0.9mm) ams ag technical content still valid

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