NSA2300 Datasheet Rev0.1.pdf 压力温度传感器

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The NSA2300 is a highly integrated 24-bit sensor conditioner for applications of high precision low frequency measurement such as pressure transducer, weight scale. It can provide fully calibration for the sensor inherent temperature drift and non-linearity with a high resolution internal or exter
Supply voltage VDD -0.3 6.5 VDDIO 0.3 6.5 Analog pin voltage 0.3 VDD+0.3V Digital output voltage 0:3 °C ESD Susceptibility kⅤ HBM Storage temperature -60 150 Supply voltage ⅤDD 2.0 5.5V VDDIO L 8V 5.5V )peration temp T 40 125|°C Supply current(a25°C 950 UA PGA oft on during conversion 1500 uA PGA on(Gain>=4) Standby current 160 nA 25C Regulato l.6 1.8 Regulator PSrr dB Current load on lload Regulator Resolution Conversion time Teny Depend on OSR setting, refer ms to table 4.1 Output Data rcsolution 24 raw data on=D) bit LSB=(1/2/23)(VEXT-PSW) 20( raw data on’=O bit LSB=0.25Pa Ettective resolution ENOB refer to Table 41 Bits Depends on (iain osr Gain setting GAIN 128 Step of 2's exp Integral Nonlinearity INL 15 of fs Common mode CMRR 110 dB Rejection Power Supply PSRR dB Rejection Output Data Resolution 16 Bit LSB-(l/256)℃ Abs accuracy of built- ±0.5℃ 25℃ In temp sensor 士l -40to85℃ External Temperature R T-RES 11 14 17 Kohm @25C(T RES sel=0) Resistance (T-RES T RES 6 Kohm @25C(T_ RES sel=1) Intcrnal resistancc l3.5 15 16.5 T ref trim<3: 0>=0000b 6.07 T ref trim<3: 0>=0001b 17.14 T ref trim<3: 0>=0010b 18.21 t ref trim< 3: 0>-0011b 19.29 T ref trim< 3: 0>=0l00b 20.36 T ref trim< 3: 0>-0101b 21.43 T ref trim< 3: 0>=oll0b 22.5 T ref trin≤3:0>=0l1lb RI Kohm I' ref trim<3: 0>-100Ob 3.93 T ref trim 3: 0,>= 1001b 12.86 ref trim<3: 0>-101ob 11.79 T re 3:0>=1011 10.71 T ref trim<3: 0>=1100b 9.64 T ref trim<3: 0>=1101b 8.57 t ref trim<3 0>=1llob 7.5 3:0>=1111b 15 T ref trim<3: 0>=0000b 13.93 T ref trim<3: 0>=0001 b R2 Kolm 12.86 T ref trim<3: 0>=0010b ll.79 10.71 T ref trim<3: 0>=0100b 9.64 T ref trim<3: 0>=0101b 8.57 t ref trim≤3:0>=0l10b T ref trim<3: 0>=0111b 15 T ref trim<3: 0>=1000b 1607 t ref trim<3: 0>-1001b 17.14 T ref trim<3: 0>=1010b 18.21 T ref trim< 3: 0>=1011b 19.29 T ref trim< 3: 0>=loB 20.36 T ref trim 3: 0>-1101b 2143 T ref trim 3: 0>=1l 10b 22.5 t ref trim 3: 0>-111lb 126 15.4 KohmT RES sel=0 4.5 5 5.5 T RES Sel=l Temperature TC 0.32%℃C|40to85℃ Coefficient of T-Res Temperature TCRI2 +/-0.02 %℃|-40to85℃ Coefticient of r1 2/3 Absolute Voltage of ⅤINP.VINN GND+0. VDD PGA off nput Pins -0.1 GND+0. 4 VDDV PGA on -0.8 Differential Input ⅤSP Ranges I/GAL Input pin leakage lin +-1|nA PGA oft Low-side power Rsw 8Ohm Switch resistance Resolution 12 Bit DNL 0.5 LSB INL LSB Rload of dac buffer Rload 5k Ohm Cload ofac Cload F Short current limit 3 m Upper output limit 3/4 VDD Lower output limit 1/4 VDD Serial Clock Frequency Sclk MHZ Table3. 1 control registers 0×00| SPI CtI rADO aISB f .SB_fir SDo_act 0x(0 clive OTP CMD OTP start blow<5: 0> OxFA TEMP LSB R Temp out<7: 0> 0x00 OxF9 TEMP_ MSBR Tep out<15: 8> 0x00 DATA LSBR Data outs: 0> 0x00 F7 DATA CSBR Data out<15: 8>> 0x00 OxF6 DATA MS R Data out <23: 16 0x00 B OxF4 CONFIG RI OSR P<I: 0> Measurement contro]<4: 0>> 0x00 (OTP) OxF3 CONFIG 2 RW Gain P<2: 0>(OTP SHR<1:0> Unip I Temp_sen Raw_data olar sor_ scl(o_on(OTP) (OTP) T TP OxF2 DAC_Ctrl RW DAC on 0x00 (OTP) OXF1 DAC lim RW DAC limit h<3: 0>(OTP) DAC limit 1<3: 0>(OTP) 0x00 UxEFTRES-selRw T ref trim<3: 0(OTP) T REs Se 0x{0 I(OTP Soft reset Softresets7- 0 0x(0 OXDO ID<7: 0>(OTP) 0x00 0xA7 T CONFIG RW Gain T<2: 0>(OTP) OsRT10>(0TP0×00 0xBB- Cal coeff Calibration Registers 0x00 OxAA 1 4-wirc SPl0: 3-wirc SPl 1: LSB first for SPi interface. 0: MSB first for SPI interface Write these bits into ol1010b to start thc otp blowing. The wholc otp banks would bc automatically programmed as what stored in the corresponding Otp registers. The otp banks can only be programmed once Provides a critical read condition to filter out weak programmed "bits when OtP reloading during soft reset. It is recommended to set this bit after OTP programmed in factory to check if the OtP banks are reliably programmed Temperature output with an LSB equals to(1/256)C data(Dat 24 bits ADC output data when raw data On=1 with an LSB equals to(1/2/23)*(VEXT-PSW)20 bits pressure L out<23: 4>)when raw data on=0 with an L SB equals to 0.2.5Pa(atter calibrated) 00:1024X,01:2048X,10:4096X,11:8192X 01110, indicate a temperature conversion. 10100, indicate a pressure conversion Start once conversion back to o when conversion ends 000:1X,001: Reserved,0104X,0l1:8X,100:16X,101:32x,110:64X,111: Reserved 00: NO SHR.01:11SHR,10:1/3SHR,11:19SHR 24bits Raw adC data will bc stored in OxF6-0xF& aftcr a prcssurc or tcmpcraturc convcrsion when this bit is set to 1 0: select external temperature sensor, 1, select internal temperature sensor 0: ADC outputs in bipolar format. 1, ADC outputs in unipolar format tble analog output set the output voltage high limit from 3/4Fs(0000b) to Fs(ll1lb) set the output voltage low limit from 0(0000b)to 1/4Fs(111lb 0: Usc 14Kohm resistancc as thc tcmpcraturc sensor. 1: Usc 5Kohm resistance as thc tcmpcraturc sensor 0>: Trim the rl/R2 from 1/3 to 3/1, that is, trim the reference voltage of external temperature sensor from 1/4 VREF to3ⅤREF Write only register. If set to OxB6, will perform a power on reset sequence. Auto returned to o after the soft completes UScr programmed chip ID Can bc uscd to check whcther communication functionin 22bytes calibration registers used for sensor calibration on chip(raw data on-0)or off-chip(raw data on-1) 000:1X,001:2X,010:4X.011:8X,100:16X,101:32X,110:64X,1ll:128X 00:1024x,01:2048x,10:4096X,11:8192X The NSA831 is a highly integrated 24-bit sensor conditioner for applications of high precision low frequency measurement such as pressure transducer, weight scale. It can provide fully calibration for the sensor inherent temperature drift and non-linearity with a high resolution internal or external temperature sensor. The chip incorporates an in-amp, a buffer and a 24-bit sigma delta modulator followed by a calibration DSP. With wide gain and Osr range, the nsa831 could be suitable for variance sensors. One-time- programmable fuses are used to store the calibration coefficients for on-chip calibration calculations. SPI and 12C interfaces are supported for serial communication YDI ⅤDDIO ASIC MEMS Vin+I VEXT LDO Contrul logics Vout+ VINP Serial O SDO/ADRR Interface PGA ADC SDA/SDISDIO filter INTI AOU SR2 T-R-ITEMP OSC POR OTP Vin- &liming Figure4.1 Basic Application Diagram The reference voltage VREF is defined as the voltage difference between VEXT pin and PSw pin. VEXT pin is powered by the internal 8V regulator for higher PSRR on a noisy system. The user could also bias this pin externally at a higher voltage, for example, short to VDD, to increase the dynamic range A low side switch on the Psw pin connected the low-side of the sensor Sensor current could be automatically turned off when not in measurement mode TEMP pin is used for external temperature sensor input. When using the external temperature sensor, a 14kohm temperature sensitive resistance should be connected between the VEXt and temp pins outside the NSa831 The total gain of the analog path can be set as 1X, 4X, 8X, 16X, 32X and 64X by setting bits GAIN<2: 0>in SYSCONF2 register. The allowed input range is +-VREF/GAIN where VREF is the voltage ditference hetween VEXT and PS w The NSA831 has a digital decimation filter followed the modulator. The output data rate could be programmable from 1024X to 8192X by sctting bits OSR<1: 0> in CONFIG I register SHR<1: 0> is used to configure the ratio of the active phase compared with the sleep phase within once conversion When setting sTIR<l: (>=00b, there's no sleep phase in the conversion and setting siiR<1: 0>=01b/10b/1ib makes the sleep phase occupies (1/2)/(3 4)/(9710)of the once conversion time Tablc4.1 shows thc cffcctivc numbcr of bit(ENOB)and Convcrsion timc(Tss)undcr diffcrcnt gain, OSR and Shr ettings. Table4.2 shows the input referred rms noise Table 4. 1 NOB(bits )under ditferent ODR and Giain settings I'ss (ms) Gain OSR SHR=OO SHR=01 SHR=10 SHR=11 4 8 16 32 64 1024X 2,5 l8.4 17.8 17.8 7.7 17.5 2048X3.78 12.527.5 8.9 18.2 18.2 18.2 L7.9 7.4 4096K 6.34 7.5 32.5 77.5 19.2 18.6 18.7 151831 l7.9 8192X11.4637.572.5177.5 19.8 19 19.1 19.1 18.4 Table 4. 1 Input referred RMS noise (nV)under different ODR and Giain settings(T REs sel =0) Tss (ms) Gain FIIR=00 SIIR=01 SIR=10 SIIR=11 1 4 8 16 64 1024X 2.5 10407.63943.741971.91056.7 606.9 429.2 2048K3.78 7.512.527.57359.3298 144.4747 459.9325.2 4096X6.3117.532.57.5597.62265.11056.7 6i06.9 348.6 229.9 8192X11.4637.572.517.53943.71716.6 800.8 400.4246.5162.6 etting Measurement control =10100b and Sco=I to initiate once pressure conversion, the chip powers up, performs once single conversion, and returns back to standby mode with automatically changing Sco to 0. IT goes high when data is ready for read out. When the data-word (Oxf6-0xf8) has been read out from the data register, InT goes low. The data register can be read several times if required, even when INT is low, but care must be taken not to read data when data register is just in refreshing. A pulsed measurement cycle is applied to pressure conversions with an SHR= 1/1 or 173 or 1/9(setting by SHR i(1/10) of the conversion time is actually active and the remains are in sleep phase re conversion, only (1/2)/(1/4) bits)to lower the average current of the pressure sensor. That is, during once pressi Two different temperature measurement methods are supported in NSA831 Settingtemp sensor sel'=0 indicates using the external temp sensor, setting 'temp sensor sel-I indicates using the internal temp sensor The gain for temperature conversion is fixed at 8X and the osr is configured by Osr t< 1: 0> during temperature conversion Setting Measurement control=01110b and Sco= 1 to initiates once temperature conversion. Like the pressure conversion, the chip returns to standby mode and the data ready interrupt assets after the conversion ends. When when setting raw data on=0, the raw 24bits ADC conversion data will be stored in the 'data out'register and setting "raw data on'-1, the 16-bit temperature data(LSB- 1/256C)is stored in the 'temp out'registers and Set 'dac on=l to get into the analog output mode During analog output mode, the Nsa83 1 alternately performs 64 times pressure conversions and once temperature conversion automatically. The higher 12 bits(without the sign bit)of the calibrated pressure data will be mapped to the aout pin with the equations below and all negative data out values will be mapped to the lower limit voltage. Calibration coefficients must be carefully set in this mode to make the full span of the pressure data occupies the full span of the output voltage Thc dac allows programming a lowcr and uppcr clipping limit for thc output signal. Thc intcrnal 12-bit calculatcd bridge value is compared against the 12-bit value formed by (11, Dac limit h[3: 0], 111111) for the upper limit and (00, DAC limit 1[3: 01,000000 for the lower limit. If the calculated pressure value is higher than the upper limit or lcss than thc lowcr limit, the analog output valuc is clipped to this valuc; otherwise it is output as is When sctting raw data on=l, thc output data rcgistcrs(Oxf6-0xf8)stores the raw ADC output, that is *2 =0) When setting the raw data on=0, the higher 20bits of output data registers stores the calibrated pressure data with an lsB 0.25 Pa and the output temperature register(0xf9-Oxfa)stores the calibrated temperature data with an LSB-1/256C The nsa831 contains 144(160 if ID register and DAC limit OTP register are used)OTP bits released to customer to program sensor calibration coefficients, which can be used to do sensor compensation inside or outside NSA831. To program the otp bits, please follow steps below 1. Write all OTP registers what you want to program 2. Switch the supply voltage on the VDi pin to 6.5V 3. Write Regox30 with oxod to enter continuous mode 4. Write RegOx6c with 01101010b to start OTP programming 5. Waiting 10ms 6. Switch the supply voltage on the vdd back to 2.5V 7. Write Regox6c with 00000001b to set the otp read out margin 8. Write rcgOxc0 with Oxb6 to soft resct the nsa831 9. Read the otp banks back to check if program succeeded NSA831 offcrs an on-chip calibration for sensor offsct, sensitivity, tcmpcraturc drift and non-lincarity with the quotations below and the maximum range for sensors that can be calibrated by NSa831 is shown in table 4.4. To get the calibration coefficient for a particular sensor, please contact Novosense customer support for coefficient calculating kits + ('-0)·(1+ Table4.4 Maximum range of sensors allowed for nsa831 Symbol Description Mi Max Unit Vis Full Span 0.005 STCI I temp drift for sensitivity -0.004 0.004 Vs/℃ STC2 n temp drift for sensitivity -le-5 Vs/℃2 Voff Sensor offset Voff+vfs<Iv/V CTCI I temp drift for Offset -0.005 0.00 V/V/ ℃ ctC 2d temp drift for Offset -1c-5 1e-5 V/V/C

试读 16P NSA2300 Datasheet Rev0.1.pdf 压力温度传感器
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