SM9333 SMI | Alldatasheet
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DOC # 40DS9302.03 Ultra-Low Pressure Digital Sensor SM9333/SM9336 Series Differential Pressure Sensors
DESCRIPTION
The SM9333/SM9336 are digital, ultra-low pressure sensors offering state-of-the-art MEMS pressure transducer technology and CMOS mixed signal processing technology to produce a digital, fully conditioned, multi-order pressure and temperature compensated sensor in JEDEC standard SOIC-16 package with a dual vertical porting option. It is available in a differential pressure configuration. The total accuracy after board mount and system level autozero is less than 1%FS. The excellent warmup behavior and long term stability further assures its expected performance over the life of the part. Page 1 FEA TURES
- Pressure ranges: 125 and 250 Pa Differential
- Accuracy after Autozero: < 1%FS
- 16 bit I2C Digital interface
- Pressure calibrated and temperature compensated output
- Compensated temperature range: -20 to 85oC Combining the pressure sensor with a signal-conditioning ASIC in a single package simplifies the use of advanced silicon micro-machined pressure sensors. The pressure sensor can be mounted directly on a standard printed circuit board and a high level, calibrated pressure signal can be acquired from the digital interface. This eliminates the need for additional circuitry, such as a compensation network or microcontroller containing a custom correction algorithm. The SM9333/SM9336 are shipped in sticks or tape & reel. Medical Industrial Sleep Apnea HVAC CPAP Airflow Measurement Ventilators Pressure Transmitters Gas Flow Instrumentation Pneumatic Gauges Air Flow Monitors Pressure Switches Life Sciences Safety Cabinets Gas Flow Instrumentation
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com No. Characteristic Symbol Minimum Maximum Units 1 Supply Voltage VDD 3.0 5.5 V 2 Digital IO Voltage VIO,DIG -0.3 VDD+0.3 V 3 Max. Digital IO Current (DC) IIO,DIG -10 +10 mA
4 Storage Temperature(a,b) TSTG -40 +125 °C
5 Proof Pressure (a, c) PProof 7 (1.0) kPa (PSI) 6 Burst Pressure (a, d) PBurst 20 (2.9) kPa (PSI) 1. Absolute Maximum Ratings All parameters are specified at Vdd = 3.3 V supply voltage at 25oC, unless otherwise noted. Notes: a. Tested on a sample basis. b. Clean, dry air compatible with wetted materials. Wetted materials include silicon, glass, RTV (silicone), gold, aluminum, copper, nickel, palladium, epoxy, stainless steel and plastic (mold compound). c. Proof pressure is defined as the maximum pressure to which the device can be taken and still perform within specifications after returning to the operating pressure range. d. Burst pressure is the pressure at which the device suffers catastrophic failure resulting in pressure loss through the device. Page 2 No. Description Symbol Minimum Maximum Units
2.1 ESD HBM Protection at all Pins VESD(HBM) -2 2 kV
- ESD 3. External Components * Not tested in production Calibrated Pressure Ranges No. Device Type PMIN (Pa) PMAX (Pa)
1 SM9333 – 125 Differential -125 +125
2 SM9336 – 250 Differential -250 +250
- Calibrated Pressure Ranges No. Description Symbol Min. Typ. Max. Units
1 Supply bypass capacitor* CVDD
2 I2C Data and clock pull up resistors* RP 4.7 kOhm
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 3 5. Recommended Operating Conditions The recommended operating conditions must not be exceeded in order to ensure proper functionality of the device. All parameters specified in the following sections refer to these recommended operating conditions unless stated otherwise. No. Description Symbol Min. Typ. Max. Units 1 Supply Voltage VVDD 3.0 3.3 3.6 V 2 Low level input voltage at SDA, SCL VIN,I2C,lo -0.3 0.9 V 3 High level input voltage at SDA, SCL VIN,I2C,hi 0.8 * VVDD VVDD+0.3 V
4 Compensated Temperature (b) TCOMP -20 +85 °C
5 Operating Temperature TA -20
85 °C 6. OPERATING CHARACTERISTICS TABLE All parameters are specified at Vdd = 3.3 V DC supply voltage at 25oC, unless otherwise noted. No. Characteristic Symbol Minimum Typical Maximum Units 1 Supply Current (e) IVDD 3.3 3.8 mA
2 Digital Pressure Output @ PMIN OUTMIN -26,215 Counts
3 Digital Pressure Output @ PMAX OUTMAX +26,214 Counts
4 Digital Full Scale Span FS 52,429 Counts
5 Resolution (Digital Output) 16 Bits
6 Update Rate 2000 Hz
Accuracy (f, g, h) SM9333 – 125 Differential ACCAZ -1.25 0.2 1.25 %FS SM9336 – 250 Differential -1 0.1 1 %FS
8 Digital Output
Accuracy (f) SM9333 – 125 Differential ACC SM9336 – 250 Differential -1.5 ± 0.3 1.5 %FS
9 Bandwidth BW 20 Hz
10 Position Sensitivity SG 0.1 %FS/g
11 Power-up
time* From supply VDD > 3.0 V to output settled to 63% of final value tUP ms
12 Step response
time* Pressure step response; settled to 63% of final value tRESP 18 ms
13 Step response
settling time* Pressure step response; output settled to full accuracy tSETTLE ms * Not tested in production Notes: e. Supply current given for continuous operation. Device can be set to sleep mode with significantly lower power consumption. Refer to section 11 for details. f. The accuracy specification applies over all operating conditions in dry clean air. This specification includes the combination of linearity, repeatability, and hysteresis errors over pressure, temperature, and 3.3 V supply voltage. g. Based on system level autozero at 25 oC after board mount or solder reflow. h. Based on sample testing during initial product qualification, not tested in production. Notes: b. Clean, dry air compatible with wetted materials.
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 4
7 I2C Interface
No. Description Condition Symbol Min. Typ. Max. Units
1 SDA output low voltage* ISDA = 3 mA VSDA,OL 0
0.4 V 2 Low-to-High transition threshold* pins SA0, SCL VSDA,LH 0.5 0.6 0.7 VDD 3 High-to-Low transition threshold* pins SA0, SCL VSDA,HL 0.3 0.4 0.5 VDD
4 I2C clock frequency*
5 Bus free time between a START and STOP condition*
6 Clock low time*
7 Clock high time*
8 START condition hold time*
9 Data setup time*
10 Data hold time*
11 Setup time for repeated START condition*
12 Setup time for STOP condition*
13 Rise time of SDA and SCL signals*
14 Fall time of SDA and SCL signals*
- Not tested in production 8. Qualification Standards REACH Compliant RoHS Compliant PFOS/PFOA Compliant For qualification specifications, please contact Sales at sales@si-micro.com
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com SOIC-16 (C) Vertical Package Dimensions Notes:
- All dimensions in units of [mm]
- Moisture Sensitivity Level (MSL): Level 3
- Clean, dry air compatible with wetted materials. Wetted materials include : Wetted materials include silicon, glass, RTV (silicone), gold, aluminum, copper, epoxy and mold compound.
- Tolerance on all dimensions ±0.13 mm unless otherwise specified.
- [B] is tube connected to bottom side of sensor die.
- [T] is tube connected to top side of sensor die. Topside pressure is positive pressure. An increase in topside pressure will result in an increase in sensor output
- Bottom plate is stainless steel
- Robust JEDEC SOIC-16 package for automated assembly
- Manufactured according to ISO9001 , ISO14001 and ISO/TS 16949 standards Lot Number Identification Page 5 9. Package Reference
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com NOTES:
- Do not connect to NC pins Package Pin-Out Package Labeling Pin No. Pin Function
1 NC (No Connect)
5 VSS
6 VDD
10 SDA
11 SCL
13 GND (ASIC Test Pin)
SM9235/SM9333/SM9336 Applications Circuit Page 6
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 7 11. Part Number Legend 10. Ordering Information Part Number Pressure Range b Voltage Shipping Comment SM9333-BCE-S-125-000 -125 Pa to +125 Pa 3.3 V Sticks (45 parts/stick) Bandwidth 20Hz a Tape and Reel (350 parts/reel) SM9333-BCE-T-125-000 SM9336-BCE-S-250-000 -250 Pa to +250 Pa 3.3 V Sticks (45 parts/stick) Bandwidth 20Hz a SM9336-BCE-T-250-000 Tape and Reel (350 parts/reel) NOTES: a. Contact SMI for bandwidths other than 20 Hz b. Contact SMI for gauge parts Package Pin-Out
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 8 12. Typical Characteristics * Zero pressure accuracy tested at 30 oC and 3.3V. Measured after HTOL (at 105 oC and 5.5V) at 168, 500 and 1000 hrs. Not tested in production
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 9 13. Functional Description
13.1 Overview
The SM9x3x series is a high precision, factory calibrated differential pressure sensor for ultra low pressure measurements. It combines a low pressure MEMS die with a 16 bit ASIC, utilizing DSP for multi dimensional polynomial error correction. The calibrated pressure output data is available via digital data interface (I2C). Status information on the sensor integrity and unique serial number are accessible via this digital interface.
13.2 Global Sensor Parameters
13.2.1 Digital Pressure Transfer Function
In general digital output data is available with a word length of 16 bit. The numeric representation is always as 2's complement, which results in a range of: The pressure sensor device is calibrated in the end-of-line production test over the specified Pmin to Pmax pressure range (see Section 4). The output code at Pmin is nominally -26,215 and at Pmax it is nominally 26,214. This allows the sensor to still operate monotically outside its nominal range till the maximum (or minimum) counts are reached. An example for a 250 differential SM9336-BCE-S-250-000 is given in the graph below
13.2.2 Conversion from counts to pressure
The digital output count gives a signed 16 bit value for pressure and to convert the count to a pressure percent reading, p%FS, (in % full scale pressure) the following equation can be used The equation below converts p%FS to actual calibrated pressure units pp-unit with pmin and pmax as specified in section 4 Green: Accuracy per specification Red and Blue: Outside specification, but expect monotonic behavior till maximum (or minimum) code is reached
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 10
13.2.4 Digital Temperature Transfer Function
An internal temperature sensor measures the chip temperature. The temperature characteristic is linear and is described by the following equation: DT = b1 * TA + b0 The temperature transfer function parameters are as follows: The typical temperature accuracy at 30 °C is within ± 2 °C.
13.3 Voltage Supply
The device is supplied from pin VDD, typically 3.3 V, but it can operate as high as 5 V. From this supply input several internal voltage regulators are generating stabilized voltage levels for analog and digital circuit sections. The different internal voltages are monitored by power-OK diagnostic circuitry. Also a stabilized voltage for the resistive MEMS pressure sensor is derived from VDD. The digital data interface allows to set it into Sleep Mode using a specific command (Enter Sleep Mode), which ensures very low consumption (IVDD,SM) of typically less than 10 µA. Of course, in Sleep Mode no pressure data is acquired. For the I2C command to send the sensor into Sleep Mode see 13.6. To wake-up the sensor to normal operation, the clock input SCL shall be toggled (a rising edge at SCL will wake-up the device).
13.4 Diagnosis Functions
13.4.1 MEMS Sensor Bridge Diagnostics
Internal errors of the MEMS pressure sensor are detected and the STATUS registers can be read via the digital I2C interface. Bridge Diagnostics An integrated bridge diagnostic circuit supervises the resistive pressure sensor to detect any of the faults as follows:
- Sensor faults:
- Short of any of the four bridge resistors of the pressure sensor
- Interruption of any of the four of bridge resistors
- Wiring faults:
- Open connection of any of the bridge supply or signals
- Wrong connection of any sensor bridge terminal to either ground or bridge supply The MEMS sensor bridge diagnostics are active permanently (true background diagnostics) and in case of an error the bridge check fail event is indicated by setting the bit bc_fail in the internal STATUS register. Bridge Supply Diagnostics Another diagnostic function checks if the supply to the sensor bridge is in its specified range. Here, in case of a supply error the bit bs_fail in the STATUS register will be set.
13.4.2 Configuration Memory Check
The integrity of data stored in the embedded NVM used as the configuration memory (calibration parameters, device configuration, device ID, etc.) is checked at power-up of the component by calculation of a check sum (CRC). If a check sum error is detected no reliable pressure calculation is possible. Therefore, the sensor remains in idle state, i.e. no pressure data transferred to the output registers DSP_T and DSP_S. In this case the bits STATUS.dsp_s_up and dsp_t_up will never be set. Temperature Digital Output Sensitivity / Offset Symbol Temperature [°C] Symbol Value [counts ] Symbol Value Unit TA,1 -40 DT,OUT,1 -32768 b1 397.2 counts/°C TA,2 125 DT,OUT,2 32767 b0 -16881 counts
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 11
13.5 I2C Interface
The SM9x3x features an I2C slave interface. This interface provides direct access to registers of the memory of the SM9x3x sensor. An external I2C master (e.g. a microcontroller) can read from and write to memory addresses (registers) of the device using the following commands:
- Random write: Sets a memory address and writes data to consecutive memory addresses of the device starting at the set memory address.
- Random read: Sets a memory address and reads data from consecutive memory addresses of the device starting at the set memory address.
- Read last: Reads data from the device starting at the last memory address set by the master. This facilitates repeated reading of the same memory addresses without transmitting a memory address first. All reads/writes must start at word aligned addresses (i.e. LSB of memory address equals 0) and read/write an even number of bytes. I2C Interface Timing Diagram:
13.5.1 I2C Command Format
The SM9x3x-Sensor uses a standard 7-bit I2C slave address field. The LSB of the slave address specifies the frame type used to perform read and write operations. For LSB = 0 the protocol is compatible to standard I2C EEPROMs, for LSB = 1 the protocol is extended by a CRC protection. Thus, each device occupies two I2C addresses: even addresses are for standard EEPROM compatible protocols and odd addresses are for CRC protected protocols. Unprotected and CRC protected frames can be interleaved. The two different frame types - standard EEPROM (without CRC) or CRC protected - are shown in the next two figures.
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 12 I2C Read / Write Commands - Standard EEPROM compatible protocol: I2C Read / Write Commands - CRC protected protocol: The memory address field sets the byte address of the first memory location to be read from or written to. Only 16-bit-word aligned reads/writes are supported, i.e. the LSB of memory address has to be zero always. The read/write data is transferred MSB first, low byte before high byte. The length field (bits[7:4]) required for CRC protected frames specifies the number of data bytes to be transferred decremented by one, i.e. a value of 0001b corresponds to two bytes. All frames must transfer an even number of bytes. The maximum length for CRC protected read/write frames is 16/4 bytes. For unprotected frames the length is unlimited.
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 13 The CRC4 and CRC8 for redundancy check are computed in the same bit and byte order as the transmission over the bus. The polynomials employed are:
- CRC4: polynomial 0x03; initialization value: 0x0F
- CRC8: polynomial 0xD5; initialization value: 0xFF If a CRC errors occurs, then the event bit com_crc_error in the STATUS register will be set.
13.5.2 I2C Command Examples
For all examples below the 7-bit device slave address used is 0x6C for unprotected commands, and 0x6D for CRC protected commands, respectively. The command sequence following describes an unprotected Read command (without CRC) of 3 subsequent 16-bit words starting at memory address 0x2E to read the corrected IC temperature, corrected pressure signal, and (synchronized) status bits of the sensor. Random Read: The following sequence writes one 16-bit word to address 0x22. This will copy 0x6C32 into the command register CMD to move the component to Sleep Mode. Random Write: Byte # 0 1 2 3 4 5 6 7 8 SBM (sent by master) 0xD8 0x2E 0xD9 SBM comment slave address 6C + LSB = 0 for Write memory address slave address 6C + LSB = 1 for Read SBS (sent by sensor) 0xF2 0x7D 0xEA 0x82 0x1E 0x00 SBS comment DSP_T (Lo-Byte) ad. 0x2E DSP_T (Hi-Byte) DSP_S (Lo-Byte) ad. 0x30 DSP_S (Hi-Byte) sync‘ed Status (b7 - b0) ad. 0x32 sync‘ed Status (b15 - b8) Byte # 0 1 2 3 SBM (sent by master) 0xD8 0x22 0x32 0x6C SBM comment slave address 6C + LSB = 0 for Write memory address Lo-Byte written to CMD[7:0] Hi-Byte written to CMD[15:8] SBS (sent by sensor) SBS comment
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 14 The next command sequence describes a CRC protected Read command of 3 subsequent 16-bit words starting at memory address 0x2E. Random Read - protected by CRC: The next example describes a Write of one 16-bit word (contents 0xCF9E) with CRC protection to address 0x36 to clear events in the STATUS register. Random Write - protected with CRC: Byte # 0 1 2 3 4 5 6 7 8 9 10 SBM (sent by master) 0xDA 0x2E 0x5B 0xDB SBM comment slave address + LSB = 0 for Write memory address 3: length = 4Byte B: CRC4 slave address + LSB = 1 for Read SBS (sent by sensor) 0xF2 0x7D 0xEA 0x82 0x1E 0x00 0x65 SBS comment DSP_T (Lo-Byte) ad. 0x2E DSP_T (Hi-Byte) DSP_S (Lo-Byte) ad. 0x30 DSP_S (Hi-Byte) sync‘ed Status (b7 - b0) ad. 0x32 sync‘ed Status (b15 - b8) CRC8 (calc'd) Byte # 0 1 2 3 4 5 SBM (sent by master) 0xDA 0x36 0x16 0x9E 0xCF 0xA1 SBM comment slave address 6D + LSB = 0 for Write memory address 1: length = 2Byte 6: CRC4 STATUS (Lo-Byte) ad. 0x36 STATUS (Hi-Byte) CRC8 (calculated) SBS (sent by sensor) SBS comment
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 15
13.6 Register Descriptions
Register Read or Write are performed via the digital communication interface. After power-up of the IC all registers except STATUS and CMD are write protected. Command register: Temperature register: Pressure register: The registers DSP_T and DSP_S contain invalid data after power-up until the first temperature and pressure values have been measured by the device and transferred to these registers. In case a NVM CRC error occurred, the DSP_T and DSP_S registers would never be updated. Thus, after power up it is necessary to wait until the STATUS.dsp_s_up and dsp_t_up bits have been set at least once before using the temperature or pressure data. It is not sufficient to wait just for a fixed time delay. 0x22 CMD bits name default rw description 15:0 cmd 0 w Writing to this register controls the state of the SM9x3x device. 0x6C32: SLEEP Mode Initiate the power state SLEEP, powering down the ASIC 0xB169: RESET Performs a reset. After reset the power-up sequence will be executed, i.e. the registers are loaded with data from the configuration memory, also a CRC check is performed. 0x2E DSP_T bits name default rw description 15:0 dsp_t r Corrected temperature measurement value of the sensor. Whenever this register is updated with a new measurement the STATUS.dsp_t_up event bit is set. 0x30 DSP_S bits name default rw description 15:0 dsp_s r corrected pressure measurement value of the sensor. Whenever this register is updated with a new measurement the STATUS.dsp_s_up event bit is set.
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com Page 16 Status register - synchronized: The bits STATUS_SYNC[15:5,0] are identical to the bits STATUS[15:5,0]. The bits STATUS_SYNC[4:3] are copied from the STATUS register when the corresponding DSP registers are read. First reading the DSP registers and then STATUS_SYNC ensures that both values are consistent to each other. The synchronized status STATUS_SYNC register can be used to continuously poll the pressure, temperature and status of the device with a single read command by reading three 16 bit words starting at address 0x2E. By evaluating STATUS_SYNC.dsp_t_up and STATUS_SYNC.dsp_s_up it can be determined if the values in DSP_T and DSP_S acquired during the same read contain recently updated temperature or pressure values. Status register: 0x32 STATUS_SYNC bits name default rw type description 0 idle 0 rw status STATUS.idle 1 - reserved - 0 rw event reserved 2 - reserved - 0 rw event reserved 3 dsp_s_up 0 rw event when DSP_S is read STATUS.dsp_s_up is copied here 4 dsp_t_up 0 rw event when DSP_T is read STATUS.dsp_t_up is copied here 5 - reserved - 0 rw status reserved 6 - reserved - 0 rw status reserved 7 bs_fail 0 rw event STATUS.bs_fail 8 bc_fail 0 rw event STATUS.bc_fail 9 - reserved - 0 rw event reserved 10 dsp_sat 0 rw status STATUS.dsp_sat 11 com_crc_error 0 rw event STATUS.com_crc_error 12 - reserved - 0 rw status reserved 13 - reserved - 0 rw status reserved 14 dsp_s_missed 0 rw event STATUS.dsp_s_missed 15 dsp_t_missed 0 rw event STATUS.dsp_t_missed 0x36 STATUS bits name default rw type1 description 0 idle 0 rw status 0: chip in busy state 1: chip in idle state 1 - reserved - 0 rw event reserved 2 - reserved - 0 rw event reserved 3 dsp_s_up 0 rw event 1: DSP_S register has been updated. Cleared when DSP_S is read 4 dsp_t_up 0 rw event 1: DSP_T register has been updated. Cleared when DSP_T is read. 5 - reserved - 0 rw status reserved 6 - reserved - 0 rw status reserved 7 bs_fail 0 rw event 1: bridge supply failure occurred 8 bc_fail 0 rw event 1: sensor bridge check failure occurred 9 - reserved - 0 rw event reserved
DOC # 40DS9302.03 SM9333/SM9336 Series www.si-micro.com 0x36 STATUS bits name default rw type1 description 10 dsp_sat 0 rw status 1: a DSP computation leading to the current DSP_T or DSP_S values was saturated to prevent overflow 11 com_crc_error 0 rw event 1: communication CRC error 12 - reserved - 0 rw status reserved 13 - reserved - 0 rw status reserved 14 dsp_s_missed 0 rw event 1: dsp_s_up was 1 when DSP_S updated 15 dsp_t_missed 0 rw event 1: dsp_t_up was 1 when DSP_T updated
- "Event" type flags remain set until cleared by writing '1' to the respective bit position in STATUS register (not STATUS_SYNC). Writing 0xFFFF to the STATUS register will clear all event bits.
- "Status" type flag represents a condition of a hardware module of the IC and persists until the condition has disappeared. Serial Number register 0: Serial Number register 1: 0x50 SER0 bits name default rw description 15:0 ser0 r Serial number of the IC, Lo-Word 0x50 SER1 bits name default rw description 15:0 ser1 r Serial number of the IC, Hi-Word
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