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首页NSA2300 Datasheet Rev0.1.pdf 压力温度传感器
NSA2300 Datasheet Rev0.1.pdf 压力温度传感器
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更新于2023-03-16
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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 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 I2C interfaces are supported for serial communication. 超小体积,高精度压力温度传感器
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NOVOSENSE
NSA831: Pressure Sensor Conditioner
with Digital Temperature Calibration
Datasheet
Product Overview
z The NSA831 is a highly integrated, low power
high precision pressure sensor conditioner. The
NSA831 features a low noise instrument
amplifier, a low power 24 bit Σ-Δ ADC, a 12bits
DAC and digital sensor Calibration logics.
z Both internal and external temperature sensing
are supported for the pressure sensor calibration
with a precision of ±1
℃
z The NSA831 can provide on-chip digital
compensation of sensor offset, gain, temperature
drift and non-linearity based on the internal fuse
banks (OTP), which is fast, precise without the
cost overhead with trimming by laser or external
components.
z Digital calibration coefficients can be written to
OTP by a simply PC-based calibration kit
provided by Novosense through the SPI/I2C
interface.
Key Features
z Input Referred RMS noise: 600nV @
OSR=1024X, GAIN=32X
z Digital compensation of sensor offset, sensitivity,
temperature drift and non-linearity with on-chip
OTP.
z Programmable gain for sensors with different
input spans up to rail-to-rail.
z Low power instrument amplifier and 24-bit Σ-Δ
ADC
z High accuracy (±1 )
℃ temperature sensor
z 4-level resolution settings for power and
accuracy trade off
z SPI / I2C Interface
z Ultra low power-down current ( < 0.2uA )
z Supply voltage 2.0V to 5.5V
z Operation temperature from -40
°C to 125°C
Available Supports
z Evaluation kit with calibration procedure for fast
user design
z Support for mass calibration
z Quick circuit customization possible
Applications
z Pressure sensor conditioner
z Strain Gauge interface
z Industry process control
NSA831
Novosense Confidential Page 2
1.0 ABSOLUTE MAXIMUM RATING ................................................................................................................................. 3
2.0 ELECTRICAL CHARACTERISTICS ............................................................................................................................ 3
3.0 REGISTERS ....................................................................................................................................................................... 6
3.1. CONTROL REGISTERS ..................................................................................................................................................... 6
4.0 FUNCTIONAL DESCRIPTIONS .................................................................................................................................... 8
4.1. SIGNAL PATH ..................................................................................................................................................................... 8
4.1.1. Analog Inputs and Reference .................................................................................................................................... 8
4.1.2. PGA, Buffer and Modulator ...................................................................................................................................... 8
4.1.3. Digital Filter with Programmable Over-Sampling Factor ....................................................................................... 8
4.1.4. Work Mode ................................................................................................................................................................ 9
4.1.4.1. Pressure Conversion ............................................................................................................................................. 9
4.1.4.2. Temperature measurement .................................................................................................................................... 9
4.1.4.3. Analog Output Mode ............................................................................................................................................. 9
4.2. OUTPUT DATA FORMAT .................................................................................................................................................... 10
4.3. OTP ................................................................................................................................................................................ 10
4.4. SENSOR CALIBRATION .................................................................................................................................................... 10
5.0 SPI INTERFACE ............................................................................................................................................................. 11
5.1. INTERFACE SPECIFICATION .............................................................................................................................................. 11
6.0 I2C INTERFACE ............................................................................................................................................................. 13
7.0 PAD ASSIGNMENT ........................................................................................................................................................ 14
8.0 TYPICAL APPLICATION ............................................................................................................................................. 15
8.1. I2C MODE ....................................................................................................................................................................... 15
8.2. SPI MODE ....................................................................................................................................................................... 16
8.3. OWI MODE ..................................................................................................................................................................... 16
NSA831
Novosense Confidential Page 3
1.0 ABSOLUTE MAXIMUM RATING
Parameter Symbol Min Typ Max Unit
Comments
Supply Voltage VDD -0.3 6.5 V
VDDIO -0.3
6.5 V
Analog pin voltage -0.3 VDD+0.3
V
Digital output voltage -0;3 VDDIO+0.3 V 25°C
ESD Susceptibility 2 kV HBM
Storage temperature -60 150
°C
2.0 ELECTRICAL CHARACTERISTICS
Parameter Symbol Min Typ Max Unit
Comments
Supply/Regulation
Supply Voltage VDD 2.0 5.5 V
VDDIO 1.8V
5.5 V
Operation temp T
A
-40 125
°C
Supply Current@25°C
on during conversion
I
DD_pgaoff
950 uA PGA off
I
DD_pgaon
1500 uA PGA on (Gain>=4)
Standby current I
sd
160 nA 25°C
Regulator output 1.6 1.8 2 V
Regulator PSRR 60 dB
Current load on
Regulator
Iload 5 mA
Signal Chain (MUX+PGA+BUFFER+ADC) CHARACTERISTICS
Resolution N 24 Bits
Conversion time Tcnv Depend on OSR setting, refer
to Table 4.1
ms
Output Data Resolution 24 (‘raw_data_on’=1) bit LSB = (1/2^23)*(VEXT-PSW)
20(‘raw_data_on’=0) bit LSB = 0.25Pa
Effective Resolution ENOB refer to Table 4.1 Bits Depends on Gain & OSR
NSA831
Novosense Confidential Page 4
Gain setting GAIN 1 128 Step of 2’s exp
Integral Nonlinearity INL 15 ppm
of FS
Common Mode
Rejection
CMRR 80 110 dB
Power Supply
Rejection
PSRR 60 dB
TEMPERATURE SENSOR
Output Data Resolution 16 Bit LSB = (1/256) ℃
Abs Accuracy of built-
in temp sensor
±0.5 ℃ @25℃
±1 -40 to 85 ℃
External Temperature
Resistance. (T-RES)
R
T-R ES
11 14 17 Kohm @25℃ (T_RES_sel=0)
R
T-R ES
4 5 6 Kohm
@25℃ (T_RES_sel=1)
Internal Resistance
R1
13.5 15 16.5
Kohm
T_ref_trim<3:0> = 0000b
16.07
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> = 0100b
20.36
T_ref_trim<3:0> = 0101b
21.43
T_ref_trim<3:0> = 0110b
22.5
T_ref_trim<3:0> = 0111b
15
T_ref_trim<3:0> = 1000b
13.93
T_ref_trim<3:0> = 1001b
12.86
T_ref_trim<3:0> = 1010b
11.79
T_ref_trim<3:0> = 1011b
10.71
T_ref_trim<3:0> = 1100b
9.64
T_ref_trim<3:0> = 1101b
8.57
T_ref_trim<3:0> = 1110b
7.5
T_ref_trim<3:0> = 1111b
R2
15
Kohm
T_ref_trim<3:0> = 0000b
13.93
T_ref_trim<3:0> = 0001b
12.86
T_ref_trim<3:0> = 0010b
11.79
T_ref_trim<3:0> = 0011b
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