LPS27HHTWTR

LPS27HHTW Datasheet MEMS pressure sensor: 260-1260 hPa absolute digital output barometer with embedded temperature sensor in water-resistant package Features • • • • • • • • • • Pressure sensor with water-resistant package Potting gel and grounded metal cap 260 to 1260 hPa absolute pressure range Current consumption down to 4 µA Absolute pressure accuracy: 0.5 hPa Low pressure sensor noise: 0.7 Pa Temperature accuracy: ±1.5 °C Embedded temperature compensation 24-bit pressure data output ODR from 1 Hz to 200 Hz • • • • • SPI, I²C or MIPI I3CSM interfaces Embedded FIFO Interrupt functions: Data-Ready, FIFO flags, pressure thresholds Supply voltage: 1.7 to 3.6 V ECOPACK lead-free compliant Applications Product status link LPS27HHTW Product summary Order code LPS27HHTWTR Temp. range [°C] -40 to +85°C Package CCLGA-10L Packing Tape and reel Product label • • • • • • • Altimeters and barometers for portable devices GPS applications Weather station equipment Sport watches e-cigarettes Water depth monitoring Gas metering Description The LPS27HHTW is an ultra-compact piezoresistive absolute pressure sensor which functions as a digital output barometer. The device also embeds a temperature sensor to monitor ambient temperature. The LPS27HHTW comprises a sensing element and an IC interface which communicates through I²C, MIPI I3CSM or SPI from the sensing element to the application. The sensing element, which detects absolute pressure, consists of a suspended membrane manufactured using a dedicated process developed by ST. The LPS27HHTW is available in a ceramic LGA package with metal lid. It is guaranteed to operate over a temperature range extending from -40 °C to +85 °C. The package is holed to allow external pressure to reach the sensing element. Gel inside the IC protects the electrical components from water and the metal cap is grounded electrically for better ESD robustness. DS13489 - Rev 1 - January 2021 For further information contact your local STMicroelectronics sales office. www.st.com LPS27HHTW Block diagrams 1 Block diagrams Figure 1. Device architecture block diagram Temperature Sensor I2C Analog Front-End MUX Digital Logic ADC MIPI I3CSM SPI Sensing Element Sensor Bias Voltage and Current Bias Clock and timing Figure 2. Digital logic Digital LP Filter LPF1 Digital LP Filter Analog Front-End LPF0 1 Pout Pressure Compensation 0 ADC Temperature Compensation DS13489 - Rev 1 EN_LPFP Output Registers I2C MIPI I3CSM Tout FIFO SPI page 2/55 LPS27HHTW Pin description 2 Pin description GND 9 GND 8 SCL/SPC 2 GND 7 6 CS 10 1 INT_DRDY VDD Vdd_IO Figure 3. Pin connections (bottom view) 3 RES 4 SDA/SDI/SDO 5 SDO/SA0 Table 1. Pin description Pin number Name 1 Vdd_IO 2 3 4 Power supply for I/O pins SCL I²C / MIPI I3CSM serial clock (SCL) SPC SPI serial port clock (SPC) Reserved Connect to GND SDA I²C / MIPI I3CSM serial data (SDA) SDI 4-wire SPI serial data input (SDI) SDI/SDO 5 Function SDO SA0 3-wire serial data input/output (SDI/SDO) 4-wire SPI serial data output (SDO) I²C least significant bit of the device address (SA0) MIPI I3CSM least significant bit of the static address (SA0) SPI enable 6 CS I²C and MIPI I3CSM / SPI mode selection (1: SPI idle mode / I²C and MIPI I3CSM communication enabled; 0: SPI communication mode / I²C and MIPI I3CSM disabled) DS13489 - Rev 1 7 INT_DRDY Interrupt or Data-Ready 8 GND 0 V supply 9 GND 0 V supply 10 VDD Power supply page 3/55 LPS27HHTW Mechanical and electrical specifications 3 Mechanical and electrical specifications 3.1 Mechanical characteristics VDD = 1.8 V, T = 25 °C, unless otherwise noted. Table 2. Pressure and temperature sensor characteristics Symbol Parameter Test condition Min. Typ.(1) Max. Unit Pressure sensor characteristics PTop Operating temperature range -40 +85 °C Pop Operating pressure range 260 1260 hPa Pbits Pressure output data Psens Pressure sensitivity PAccRel Relative accuracy over pressure (2) PAccT Absolute accuracy over temperature Pnoise RMS pressure sensing noise(3) P= 800 - 1100 hPa, T = 25 °C 24 bits 4096 LSB/hPa ±0.025 hPa P = 860 ~ 1160 hPa, T = 25 ~ 65°C ±0.5 P = 260 ~ 1260 hPa, T = 0 ~ 65 °C ±1 with embedded filter and at T = 25 °C hPa 0.007 hPa RMS 1 10 25 ODRPres Pressure output data rate (4) 50 Hz 75 100 200 TCO Temperature coefficient offset P_longterm Pressure accuracy, long-term stability P_drift Soldering drift P = 860 ~ 1160 hPa, T = -20 ~ +65 °C 0.75 Pa/°C 1 hPa/year ±0.5 hPa Temperature sensor characteristics Top Operating temperature range Tacc Temperature absolute accuracy Tsens Temperature sensitivity -40 25 ~ 65 °C +85 °C ±1.5 °C 100 LSB/°C 1 10 25 ODRT Temperature output data rate 50 Hz 75 100 200 1. Typical specifications are not guaranteed. 2. By design, the typ. value is defined based characterization data with 10 hPa pressure interval. 3. Pressure noise RMS evaluated in a controlled environment, based on the average standard deviation of 50 measurements with LOW_NOISE_EN = 1, EN_LPFP = 1, LPFP_CFG = 1. 4. Output data rate is configured acting on ODR[2:0] in CTRL_REG1 (10h). DS13489 - Rev 1 page 4/55 LPS27HHTW Electrical characteristics 3.2 Electrical characteristics VDD = 1.8 V, T = 25 °C, unless otherwise noted. Table 3. Electrical characteristics Symbol VDD Vdd_IO Parameter Test condition Min. Unit 1.7 3.6 V IO supply voltage 1.7 Vdd+0.1 V 4 LOW_NOISE_EN = 0 Supply current µA @ ODR 1 Hz 12 LOW_NOISE_EN = 1 IddPdn Max. Supply voltage @ ODR 1 Hz Idd Typ.(1) Supply current in power-down mode 0.9 µA 1. Typical specifications are not guaranteed. Table 4. DC characteristics Symbol Parameter Condition Min. Typ. Max. Unit 0.3 * Vdd V DC input characteristics Vil Low-level input voltage (Schmitt buffer) Vih High-level input voltage (Schmitt buffer) 0.7 * Vdd V DC output characteristics DS13489 - Rev 1 Vol Low-level output voltage Voh High-level output voltage 0.2 Vdd - 0.2 V V page 5/55 LPS27HHTW Communication interface characteristics 3.3 Communication interface characteristics 3.3.1 SPI - serial peripheral interface Subject to general operating conditions for Vdd and TOP. Table 5. SPI slave timing values Symbol Parameter Value(1) Min. tc(SPC) SPI clock cycle fc(SPC) SPI clock frequency tsu(CS) CS setup time 6 th(CS) CS hold time 8 tsu(SI) SDI input setup time 5 th(SI) SDI input hold time 15 tv(SO) SDO valid output time th(SO) SDO output hold time tdis(SO) SDO output disable time Max. Unit ns 100 10(2) MHz ns 50 9 50 1. Values are guaranteed at 10 MHz clock frequency for SPI with both 4 and 3 wires, based on characterization results, not tested in production. 2. Recommended to set max SPI clock 8 MHz to ≤50 Hz ODR. Figure 4. SPI slave timing diagram Note: Measurement points are done at 0.3·Vdd_IO and 0.7·Vdd_IO for both ports. DS13489 - Rev 1 page 6/55 LPS27HHTW Communication interface characteristics 3.3.2 I²C - inter-IC control interface Subject to general operating conditions for Vdd and TOP. Table 6. I²C slave timing values Symbol f(SCL) I²C standard mode(1) Parameter I²C fast mode(1) Min. Max Min. Max. 0 100 0 400 SCL clock frequency tw(SCLL) SCL clock low time 4.7 1.3 tw(SCLH) SCL clock high time 4.0 0.6 tsu(SDA) SDA setup time 250 100 th(SDA) SDA data hold time 0 th(ST) START condition hold time 4 0.6 tsu(SR) Repeated START condition setup time 4.7 0.6 tsu(SP) STOP condition setup time 4 0.6 4.7 1.3 tw(SP:SR) Bus free time between STOP and START condition 3.45 Unit kHz µs ns 0 0.9 µs µs 1. Data based on standard I²C protocol requirement, not tested in production. Figure 5. I²C slave timing diagram REPEATED START START tsu(SR) tw(SP:SR) SDA tsu(SDA) START th(SDA) tsu(SP) STOP SCL th(ST) tw(SCLL) tw(SCLH) Note: Measurement points are done at 0.3·Vdd_IO and 0.7·Vdd_IO for both ports. DS13489 - Rev 1 page 7/55 LPS27HHTW Absolute maximum ratings 3.4 Absolute maximum ratings Stress above those listed as “Absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Table 7. Absolute maximum ratings Symbol Vdd Vdd_IO Vin P(water) Ratings Maximum value Unit Supply voltage -0.3 to 4.8 V I/O pins supply voltage -0.3 to 4.8 V -0.3 to Vdd_IO +0.3 V 1 MPa -40 to +125 °C 2 (HBM) kV Input voltage on any control pin Overpressure TSTG Storage temperature range ESD Electrostatic discharge protection Note: Supply voltage on any pin should never exceed 4.8 V. This device is sensitive to mechanical shock, improper handling can cause permanent damage to the part. This device is sensitive to electrostatic discharge (ESD), improper handling can cause permanent damage to the part. DS13489 - Rev 1 page 8/55 LPS27HHTW Functionality 4 Functionality The LPS27HHTW is a high-resolution, digital output pressure sensor packaged in a CCLGA package with metal lid. The complete device includes a sensing element based on a piezoresistive Wheatstone bridge approach, and an IC interface which communicates a digital signal from the sensing element to the application. 4.1 Sensing element An ST proprietary process is used to obtain a silicon membrane for MEMS pressure sensors. When pressure is applied, the membrane deflection induces an imbalance in the Wheatstone bridge piezoresistances whose output signal is converted by the IC interface. 4.2 IC interface The complete measurement chain is composed of a low-noise amplifier which converts the resistance unbalance of the MEMS sensors (pressure and temperature) into an analog voltage using an analog-to-digital converter. The pressure and temperature data may be accessed through an I²C/MIPI I3CSM/SPI interface thus making the device particularly suitable for direct interfacing with a microcontroller. The LPS27HHTW features a Data-Ready signal which indicates when a new set of measured pressure and temperature data are available, thus simplifying data synchronization in the digital system that uses the device. 4.3 Factory calibration The trimming values are stored inside the device in a non-volatile structure. When the device is turned on, the trimming parameters are downloaded into the registers to be employed during the normal operation which allows the device to be used without requiring any further calibration. DS13489 - Rev 1 page 9/55 LPS27HHTW Device structure 4.4 Device structure The LPS27HHTW has a unique cylindrical package solution with a full metal lid assembled on ceramic substrate and this cylindrical package provides an easy assembly with O-rings in the end user’s application. Figure 6. LPS27HHTW internal structure This structure (Figure 6) is designed and verified to resist water pressure up to 10 ATM and the potting gel in the LPS27HHTW has been proven to protect electronic components from long-term exposure to harsh environments such as water mixed with chlorine, bromine, commercial washing detergent and fuels, solvents and chemicals. It also provides excellent low-stress encapsulation performance for sensitive electronic components from severe environmental conditions such as high temperature and humidity, refer to the properties of the gel which are given in the following table. Table 8. Potting gel properties Properties Permeability g/m²·24 hr 7 Hardness (penetration) based on ASTM D1403 70 Ultra-low Young's modulus TCE (Thermal Coefficient of Expansion) DS13489 - Rev 1 Potting gel Less than 0.01 GPa 300 ppm/°C page 10/55 LPS27HHTW Interpreting pressure readings 4.5 Interpreting pressure readings The pressure data are stored in 3 registers: PRESS_OUT_H (2Ah), PRESS_OUT_L (29h), and PRESS_OUT_XL (28h). The value is expressed as a 24-bit signed number (in 2’s complement). To obtain the pressure in hPa, take the complete 24-bit word and then divide by the sensitivity 4096 LSB/ hPa. This same interpretation is applied to pressure readings when FIFO is enabled and the pressure data are stored in 3 registers: FIFO_DATA_OUT_PRESS_XL (78h), FIFO_DATA_OUT_PRESS_L (79h), and FIFO_DATA_OUT_PRESS_H (7Ah). Figure 7. Pressure readings Pressure Value LSB = PRESS_OUT_H 2Aℎ & PRESS_OUT_L 29ℎ & PRESS_OUT_XL 28ℎ = 3FF58Dℎ = 4191629 LSB signed decimal Pressure ℎPa = 4.6 (1) Pressure Value LSB = 4191629 LSB = 1023 ℎPa Sensitivity 4096 LSB/ℎPA (2) Interpreting temperature readings The temperature data are stored in 2 registers: TEMP_OUT_H (2Ch) and TEMP_OUT_L (2Bh). The value is expressed as 2’s complement. To obtain the temperature in °C, take the two’s complement of the complete 16-bit word and then divide by the sensitivity 100 LSB/°C. This same interpretation is applied to temperature readings when FIFO is enabled and the temperature data are stored in 2 registers: FIFO_DATA_OUT_TEMP_H (7Ch) and FIFO_DATA_OUT_TEMP_L (7Bh). Figure 8. Temperature readings TEMP_OUT_H 0 0 0 0 1 0 0 1 TEMP_OUT_L 1 1 0 0 0 1 0 0 Temperature Value (LSB) = TEMP_OUT_H (2Ch) & TEMP_OUT_L (2Bh) = 09C4 = 2500 LSB (decimal signed) Temperature (°C) = DS13489 - Rev 1 Temperature Value (LSB) 2500 LSB = = 25.00°C Sensitivity 100 LSB/°C page 11/55 LPS27HHTW FIFO 5 FIFO The LPS27HHTW embeds 128 slots of 40-bit data FIFO to store the pressure and temperature output values. This allows consistent power saving for the system, since the host processor does not need to continuously poll data from the sensor, but it can wake up only when needed and burst the significant data out from the FIFO. This buffer can work according to six different modes: • Bypass mode • FIFO mode • Continuous (Dynamic-Stream) mode • Continuous (Dynamic-Stream)-to-FIFO mode • Bypass-to-Continuous (Dynamic-Stream) • Bypass-to-FIFO mode The FIFO buffer is enabled when a configuration different from all bits '0' are written in FIFO_CTRL (13h) and each mode is selected by the TRIG_MODES bit and F_MODE[1:0] bits in FIFO_CTRL (13h). Programmable FIFO threshold status, FIFO overrun events and the number of unread samples stored are available in the FIFO_STATUS1 (25h) and FIFO_STATUS2 (26h) registers and can be set to generate dedicated interrupts on the INT_DRDY pad using the CTRL_REG3 (12h) register. FIFO_STATUS2 (26h)(FIFO_WTM_IA) goes to '1' when the number of unread samples (FIFO_STATUS1 (25h) (FSS[7:0]) is greater than or equal to WTM[6:0] in FIFO_WTM (14h). If FIFO_WTM (14h)(WTM[6:0]) is equal to 0, FIFO_STATUS2 (26h)(FIFO_WTM_IA) stays at '0'. FIFO_STATUS2 (26h)(FIFO_OVR_IA) is equal to '1' if a FIFO slot is overwritten. FIFO_STATUS1 (25h)(FSS[7:0]) contains stored data levels of unread samples; when FSS[7:0] is equal to ‘00000000’, FIFO is empty; when FSS[7:0] is equal to ‘10000000’, FIFO is full and the unread samples are 128. DS13489 - Rev 1 page 12/55 LPS27HHTW Bypass mode 5.1 Bypass mode In Bypass mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘000’ or ‘100’), the FIFO is not operational and it remains empty. Switching to Bypass mode is also used to reset the FIFO. Passing through Bypass mode is mandatory when switching between different FIFO buffer operating modes. As described in the next figure, for each channel only the first address is used. When new data is available, the older data is overwritten. Figure 9. Bypass mode P i ,T i empty DS13489 - Rev 1 P0 T0 P1 T1 P2 T2 P127 T127 page 13/55 LPS27HHTW FIFO mode 5.2 FIFO mode In FIFO mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘001’) data from the output PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah), TEMP_OUT_L (2Bh), and TEMP_OUT_H (2Ch) are stored in the FIFO until it is full. To reset FIFO content, in order to select Bypass mode the value '000' must be written in FIFO_CTRL (13h) (TRIG_MODE & F_MODE[1:0]). After this reset command it is possible to restart FIFO mode by writing the value '001' in FIFO_CTRL (13h)(TRIG_MODE & F_MODE[1:0]). The FIFO buffer memorizes 128 levels of data, but the depth of the FIFO can be resized/reduced by setting the FIFO_CTRL (13h)(STOP_ON_WTM) bit. If the STOP_ON_WTM bit is set to '1', FIFO depth is limited to FIFO_WTM (14h)(WTM[6:0]) data. Figure 10. FIFO mode P i ,T i DS13489 - Rev 1 P0 T0 P1 T1 P2 T2 P127 T127 page 14/55 LPS27HHTW Continuous (Dynamic-Stream) mode 5.3 Continuous (Dynamic-Stream) mode In Continuous (Dynamic-Stream) mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘011’) after emptying the FIFO, the first new sample that arrives becomes the first to be read in a subsequent read burst. In this way, the number of new data available in FIFO does not depend on the previous read. In Continuous (Dynamic-Stream) mode FIFO_STATUS1 (25h)(FSS[7:0]) is the number of new pressure and temperature samples available in the FIFO buffer. Continuous (Dynamic-Stream) is intended to be used to read FIFO_STATUS1 (25h)(FSS[7:0]) samples when it is not possible to guarantee reading data within 1/ODR time period. Also, a FIFO threshold interrupt on the INT_DRDY pad through CTRL_REG3 (12h)(INT_F_WTM) can be enabled in order to read data from the FIFO and leave free memory slots for incoming data. Figure 11. Continuous (Dynamic-Stream) mode DS13489 - Rev 1 page 15/55 LPS27HHTW Bypass-to-FIFO mode 5.4 Bypass-to-FIFO mode In Bypass-to-FIFO mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘101’), FIFO behavior switches when the INT_SOURCE (24h)(IA) bit rises for the first time. When the INT_SOURCE (24h)(IA) bit is equal to '0', FIFO behaves like in Bypass mode. Once the INT_SOURCE (24h)(IA) bit rises to '1', FIFO behavior switches and keeps behaving like in FIFO mode. An interrupt generator has to be set to the desired configuration through INTERRUPT_CFG (0Bh). Figure 12. Bypass-to-FIFO mode P i ,T i empty P i ,T i P0 T0 T1 P1 T1 P2 T2 P2 T2 P127 T127 P127 T127 P0 T0 P1 Bypass Mode FIFO Mode Trigger event DS13489 - Rev 1 page 16/55 LPS27HHTW Bypass-to-Continuous (Dynamic-Stream) mode 5.5 Bypass-to-Continuous (Dynamic-Stream) mode In Bypass-to-Continuous (Dynamic-Stream) mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘110’), FIFO operates in Bypass mode until it switches to Continuous (Dynamic-Stream) mode behavior when INT_SOURCE (24h)(IA) rises to '1', then FIFO behavior keeps behaving like in Continuous (Dynamic-Stream) mode. An interrupt generator has to be set to the desired configuration through INTERRUPT_CFG (0Bh). Figure 13. Bypass-to-Continuous (Dynamic-Stream) mode P i ,T i empty T0 T1 P1 T1 T2 P2 T2 P126 T126 P127 T127 T0 P1 P2 P127 P i ,T i P0 P0 T127 Bypass Mode Dynamic-Stream Mode Trigger event DS13489 - Rev 1 page 17/55 LPS27HHTW Continuous (Dynamic-Stream)-to-FIFO mode 5.6 Continuous (Dynamic-Stream)-to-FIFO mode In Continuous (Dynamic-Stream)-to-FIFO mode (FIFO_CTRL (13h)(TRIG_MODES and F_MODE[1:0] = ‘111’), data are stored in FIFO and FIFO operates in Continuous (Dynamic-Stream) mode behavior until it switches to FIFO mode behavior when INT_SOURCE (24h)(IA) rises to '1'. An interrupt generator has to be set to the desired configuration through INTERRUPT_CFG (0Bh). Figure 14. Continuous (Dynamic-Stream)-to-FIFO mode P i ,T i P0 T0 P1 P i ,T i P0 T0 T1 P1 T1 P2 T2 P2 T2 P126 T126 P127 T127 P127 T127 Dynamic-Stream Mode FIFO Mode Trigger event 5.7 Retrieving data from FIFO FIFO data is read through FIFO_DATA_OUT_PRESS (78h, 79h and 7Ah) and FIFO_DATA_OUT_TEMP (7Bh, 7Ch). The read address is automatically updated by the device and it rolls back to 78h when register 7Ch is reached. In order to read all FIFO levels in a multiple byte read, 640 bytes (5 output registers by 128 levels) must be read. DS13489 - Rev 1 page 18/55 LPS27HHTW Application hints 6 Application hints Figure 15. LPS27HHTW electrical connections (top view) The device power supply must be provided through the VDD line; a power supply decoupling capacitor C1 (100 nF) must be placed as near as possible to the supply pads of the device. The C1 capacitor can be tied to VDD and Vdd_IO, but it is recommended to use 2 capacitors, one on each VDD and Vdd_IO line, in case VDD are Vdd_IO are separate. Depending on the application, an additional capacitor of 4.7 µF could be placed on the VDD line. The functionality of the device and the measured data outputs are selectable and accessible through the I²C, MIPI I3CSM, SPI interface. When using the I²C and MIPI I3CSM, CS must be tied to Vdd_IO. All the voltage and ground supplies must be present at the same time to have proper behavior of the IC (refer to Figure 15). It is possible to remove VDD while maintaining Vdd_IO without blocking the communication bus, in this condition the measurement chain is powered off. Note: To guarantee proper power-off of the device, it is recommended to maintain the duration of the VDD line to GND for at least 10 ms. DS13489 - Rev 1 page 19/55 LPS27HHTW Soldering information Figure 16. LPS27HHTW power-off sequence VDD 0.2V Min.10ms Time   6.1 VDD Rising / Falling time : 10 µs ~ 100 ms VDD must be lower than 0.2 V for at least 10 ms during power-off sequence for correct POR Soldering information The CCLGA package is compliant with the ECOPACK standard and it is qualified for soldering heat resistance according to JEDEC J-STD-020. DS13489 - Rev 1 page 20/55 LPS27HHTW Digital interfaces 7 Digital interfaces 7.1 Serial interfaces The registers embedded in the LPS27HHTW may be accessed through either the I²C, MIPI I3CSM or SPI serial interfaces. The latter may be SW configured to operate either in 3-wire or 4-wire interface mode. The serial interfaces are mapped onto the same pads. To select/exploit the I²C interface, the CS line must be tied high (i.e. connected to Vdd_IO). Table 9. Serial interface pin description Pin name Pin description SPI enable CS I²C/SPI mode selection (1: SPI idle mode / I²C communication enabled; 0: SPI communication mode / I²C disabled) SCL/SPC SPI serial port clock (SPC) SDA I²C serial data (SDA) SDI 4-wire SPI serial data input (SDI) SDI/SDO 7.2 I²C serial clock (SCL) 3-wire serial data input /output (SDI/SDO) SDO SPI serial data output (SDO) SA0 I²C less significant bit of the device address (SA0) I²C serial interface (CS = high) The LPS27HHTW I²C is a bus slave. The I²C is employed to write data into registers whose content can also be read back. The relevant I²C terminology is given in the following table. Table 10. I²C terminology Term Transmitter Receiver Description The device which sends data to the bus The device which receives data from the bus Master The device which initiates a transfer, generates clock signals and terminates a transfer Slave The device addressed by the master There are two signals associated with the I²C bus: the serial clock line (SCL) and the serial data line (SDA). The latter is a bidirectional line used for sending and receiving the data to/from the interface. Both lines have to be connected to Vdd_IO through pull-up resistors. The I²C interface is compliant with fast mode (400 kHz) I²C standards as well as with the normal mode. DS13489 - Rev 1 page 21/55 LPS27HHTW I²C serial interface (CS = high) 7.2.1 I²C operation The transaction on the bus is started through a START (ST) signal. A start condition is defined as a HIGH-to-LOW transition on the data line while the SCL line is held HIGH. After the master has transmitted this, the bus is considered busy. The next data byte transmitted after the start condition contains the address of the slave in the first 7 bits and the eighth bit tells whether the master is receiving data from the slave or transmitting data to the slave. When an address is sent, each device in the system compares the first seven bits after a start condition with its address. If they match, the device considers itself addressed by the master. The 7-bit slave address (SAD) associated to the LPS27HHTW is 101110xb. The SDO/SA0 pad can be used to modify the less significant bit of the device address. If the SA0 pad is connected to voltage supply, LSb is ‘1’ (7-bit address 1011101b=5Dh), otherwise if the SA0 pad is connected to ground, the LSb value is ‘0’ (7-bit address 1011100b=5Ch). This solution permits connecting and addressing two different LPS27HHTW devices to the same I²C lines. Data transfer with acknowledge is mandatory. The transmitter must release the SDA line during the acknowledge pulse. The receiver must then pull the data line LOW so that it remains stable low during the HIGH period of the acknowledge clock pulse. A receiver which has been addressed is obliged to generate an acknowledge after each byte of data received. The I²C embedded inside the ASIC behaves like a slave device and the following protocol must be adhered to. After the start condition (ST) a slave address is sent, once a slave acknowledge has been returned (SAK), an 8-bit sub-address will be transmitted (SUB): the 7 LSB represent the actual register address while the MSB has no meaning. The IF_ADD_INC bit in CTRL_REG2 (11h) enables sub-address auto increment (IF_ADD_INC is '1' by default), so if IF_ADD_INC = '1' the SUB (sub-address) will be automatically increased to allow multiple data read/write. The slave address is completed with a Read/Write bit. If the bit is ‘1’ (Read), a repeated START (SR) condition must be issued after the two sub-address bytes; if the bit is ‘0’ (Write) the master will transmit to the slave with direction unchanged. Table 11 explains how the SAD+read/write bit pattern is composed, listing all the possible configurations. Table 11. SAD+Read/Write patterns Command SAD[6:1] SAD[0] = SA0 R/W SAD+R/W Read 101110 0 1 10111001 (B9h) Write 101110 0 0 10111000 (B8h) Read 101110 1 1 10111011 (BBh) Write 101110 1 0 10111010 (BAh) Table 12. Transfer when master is writing one byte to slave Master ST SAD + W SUB Slave SAK DATA SAK SP SAK Table 13. Transfer when master is writing multiple bytes to slave Master ST SAD + W SUB Slave SAK DATA SAK DATA SAK SP SAK Table 14. Transfer when master is receiving (reading) one byte of data from slave Master Slave DS13489 - Rev 1 ST SAD + W SUB SAK SR SAK SAD + R NMAK SAK SP DATA page 22/55 LPS27HHTW SPI bus interface (CS = low) Table 15. Transfer when master is receiving (reading) multiple bytes of data from slave Master ST Slave SAD+W SUB SAK SR SAK SAD+R MAK SAK DATA MAK DATA NMAK SP DATA Data are transmitted in byte format (DATA). Each data transfer contains 8 bits. The number of bytes transferred per transfer is unlimited. Data is transferred with the most significant bit (MSb) first. If a slave receiver does not acknowledge the slave address (i.e. it is not able to receive because it is performing some real-time function), the data line must be kept HIGH by the slave. The master can then abort the transfer. A LOW-to-HIGH transition on the SDA line while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be terminated by the generation of a STOP (SP) condition. In the presented communication format MAK is Master acknowledge and NMAK is no master acknowledge. 7.3 SPI bus interface (CS = low) The LPS27HHTW SPI is a bus slave. The SPI allows writing to and reading from the registers of the device. The serial interface interacts with the application using 4 wires: CS, SPC, SDI and SDO. Figure 17. Read and write protocol CS SPC SDI RW DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 AD6 AD5 AD4 AD3 AD2 AD1 AD0 SDO DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 CS is the serial port enable and it is controlled by the SPI master. It goes low at the start of the transmission and returns to high at the end. SPC is the serial port clock and it is controlled by the SPI master. It is stopped high when CS is high (no transmission). SDI and SDO are respectively the serial port data input and output. Those lines are driven at the falling edge of SPC and should be captured at the rising edge of SPC. Both the read register and write register commands are completed in 16 clock pulses or multiples of 8 in the case of multiple read/write bytes. Bit duration is the time between two falling edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the falling edge of CS while the last bit (bit 15, bit 23,...) starts at the last falling edge of SPC just before the rising edge of CS. bit 0: RW bit. When 0, the data DI(7:0) is written into the device. When 1, the data DO(7:0) from the device is read. In the latter case, the chip will drive SDO at the start of bit 8. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DI(7:0) (write mode). This is the data that is written into the device (MSb first). bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first). In multiple read/write commands further blocks of 8 clock periods are added. When the IF_ADD_INC bit is 0, the address used to read/write data remains the same for every block. When the IF_ADD_INC bit is 1, the address used to read/write data is incremented at every block. The function and the behavior of SDI and SDO remain unchanged. DS13489 - Rev 1 page 23/55 LPS27HHTW SPI bus interface (CS = low) 7.3.1 SPI read Figure 18. SPI read protocol The SPI read command is performed with 16 clock pulses. The multiple byte read command is performed by adding blocks of 8 clock pulses to the previous one. bit 0: READ bit. The value is 1. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first). bit 16-...: data DO(...-8). Further data in multiple byte reads. Figure 19. Multiple byte SPI read protocol (2-byte example) DS13489 - Rev 1 page 24/55 LPS27HHTW SPI bus interface (CS = low) 7.3.2 SPI write Figure 20. SPI write protocol CS SPC SDI RW DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 AD6 AD5 AD4 AD3 AD2 AD1 AD0 The SPI write command is performed with 16 clock pulses. The multiple byte write command is performed by adding blocks of 8 clock pulses to the previous one. bit 0: WRITE bit. The value is 0. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DI(7:0) (write mode). This is the data that is written in the device (MSb first). bit 16-...: data DI(...-8). Further data in multiple byte writes. Figure 21. Multiple byte SPI write protocol (2-byte example) CS SPC SDI DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8 RW AD6 AD5 AD4 AD3 AD2 AD1 AD0 DS13489 - Rev 1 page 25/55 LPS27HHTW SPI bus interface (CS = low) 7.3.3 SPI read in 3-wire mode A 3-wire mode is entered by setting bit SIM to ‘1’ (SPI serial interface mode selection) in CTRL_REG1 (10h). Figure 22. SPI read protocol in 3-wire mode CS SPC SDI/O DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 RW MS AD6 AD5 AD4 AD3 AD2 AD1 AD0 The SPI read command is performed with 16 clock pulses: bit 0: READ bit. The value is 1. bit 1-7: address AD(6:0). This is the address field of the indexed register. bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first). A multiple read command is also available in 3-wire mode. DS13489 - Rev 1 page 26/55 LPS27HHTW MIPI I3CSM slave interface 7.4 MIPI I3CSM slave interface The LPS27HHTW interface includes a MIPI I3CSM SDR only slave interface with MIPI I3CSM SDR embedded features: • CCC command • Direct CCC communication (SET and GET) • Broadcast CCC communication • Private communications • Private read and write for single byte • Multiple read and write • In-band interrupt and hot-join requests 7.4.1 MIPI I3CSM CCC supported commands The list of MIPI I3CSM CCC commands supported by the device is detailed in the following table. Table 16. MIPI I3CSM CCC commands Command Command code Default Description ENEC 0x80 / 0x00 Slave activity control (direct and broadcast) RSTDAA 0x86 / 0x06 Reset the assigned dynamic address (direct and broadcast) DISEC 0x81/ 0x01 Slave activity control (direct and broadcast) ENTAS0 0x82 / 0x02 Enter activity state (direct and broadcast) ENTAS1 0x83 / 0x03 Enter activity state (direct and broadcast) ENTAS2 0x84 / 0x04 Enter activity state (direct and broadcast) ENTAS3 0x85 / 0x05 Enter activity state (direct and broadcast) SETMWL 0x89 / 0x08 SETMRL 0x8A / 0x09 0x00 0x08 Define maximum write length during private write (direct and broadcast) 0x00 0x10 Define maximum read length during private read (direct and broadcast) 0x04 SETDASA 0x87 Assign dynamic address using static address (0x5C/0x5D depending on the SDO level) SETNEWDA 0x88 Change dynamic address GETMWL 0x8B 0x00 0x08 Get maximum write length during private write 0x00 GETMRL 0x8C 0x10 Get maximum read length during private read 0x04 0x02 0x08 GETPID 0x8D 0x00 0xB3 Device ID register 0x00 0x00 GETBCR 0x8E 0x07 Bus characteristics register GETDCR 0x8F 0x62 DCR GETSTATUS 0x90 DS13489 - Rev 1 Status register page 27/55 LPS27HHTW MIPI I3CSM slave interface Command Command code GETMXDS 0x94 Default Description 0x00 0x20 Return max data speed 0x07 GETXTIME 0x99 0x04 0x0A Get exchange time information 0x64 DS13489 - Rev 1 page 28/55 LPS27HHTW I²C/MIPI I3CSM coexistence in LPS27HHTW 7.5 I²C/MIPI I3CSM coexistence in LPS27HHTW In the LPS27HHTW, the SDA and SCL lines are common to both I²C and MIPI I3CSM. The I²C bus requires anti-spike filters on the SDA and SCL pins that are not compatible with MIPI I3CSM timing. The device can be connected to both I²C and MIPI I3CSM or only to the MIPI I3CSM bus depending on the connection of the INT1 pin when the device is powered up: • INT_DRDY pin floating (internal pull-down): I²C/MIPI I3CSM both active, see Figure 23 – I²C case: INT_DRDY pin is by default an input with pull-down. If I²C is used, INT_DRDY must be left unconnected or eventually pulled down during device initialization. After power-on, during device configuration, the INT_DRDY pin can be programmed as an interrupt output pin and it is recommended to set bit I3C_disable to '1'. – I3C case: INT_DRDY pin is by default an input with pull-down. If I3C is used and the INT_DRDY pin is unconnected, dynamic address assignment must be performed using I²C Fast Mode Plus Timing (max 1 MHz clock). After dynamic address assignment, I3C can be used in full speed mode. • INT_DRDY pin connected to Vdd_IO: only MIPI I3CSM active, see Figure 24 – Only I3C: INT_DRDY pin is by default an input with pull-down. If INT_DRDY is set to Vdd_IO, I3C slave is selected and device can be initialized at full speed through the SETDASA command. If the I3C bus is available for more than 10 msec and the device is not yet addressed, a hot join request is performed (SDA line kept to ground from slave) and the master must manage the request. After device address assignment, a private write can be performed to disconnect the INT_DRDY pull-down. Figure 23. I²C and MIPI I3CSM both active (INT_DRDY pin not connected) INT1 pin not connected I²C/I3C both active I²C/I3C (both active) I²C bus case Master sends I²C r/w Slave performs requested r/w 1. DS13489 - Rev 1 I3C bus case Master assigns DA to the slave(1) Master resets DA I3C private R/W with and without 7Eh CCC commands Slave event management Error detection and recovery Address assignment (SETDASA) must be performed with I²C Fast Mode Plus Timing. When the slave is addressed, the I²C slave is disabled and the timing is compatible with MIPI I3CSM specifications. page 29/55 LPS27HHTW I²C/MIPI I3CSM coexistence in LPS27HHTW Figure 24. Only MIPI I3CSM active (INT_DRDY pin connected to Vdd_IO) INT1 pin connected to Vdd_IO Only I3C active I²C/I3C I3C bus case Dynamic Address Assignment (1) Master resets DA I3C private R/W with and without 7Eh CCC commands Slave event management Error detection and recovery 1. DS13489 - Rev 1 When the slave is MIPI I3CSM only, the I²C slave is always disabled. The address can be assigned using MIPI I3CSM SDR timing. page 30/55 LPS27HHTW Register mapping 8 Register mapping The following table provides a quick overview of the 8-bit registers embedded in the device. Table 17. Registers address map Register Name Type Reserved Default Function and comment Hex Binary 00 - 0A - Reserved Interrupt register INTERRUPT_CFG R/W 0B 00000000 THS_P_L R/W 0C 00000000 THS_P_H R/W 0D 00000000 IF_CTRL Pressure threshold registers R/W 0E 00000000 Interface control register WHO_AM_I R 0F 10110011 Who am I CTRL_REG1 R/W 10 00000000 CTRL_REG2 R/W 11 00010000 CTRL_REG3 R/W 12 00000000 FIFO_CTRL R/W 13 00000000 FIFO_WTM R/W 14 00000000 REF_P_L R/W 15 00000000 REF_P_H R/W 16 00000000 17 - Reserved Control registers FIFO configuration register Reference pressure registers RPDS_L R/W 18 00000000 RPDS_H R/W 19 00000000 1A - 23 - Reserved Interrupt register Reserved INT_SOURCE R 24 Output FIFO_STATUS1 R 25 Output FIFO_STATUS2 R 26 Output STATUS R 27 Output PRESS_OUT_XL R 28 Output PRESS_OUT_L R 29 Output PRESS_OUT_H R 2A Output TEMP_OUT_L R 2B Output TEMP_OUT_H R 2C Output Reserved LPFP_RES R Reserved DS13489 - Rev 1 Address FIFO_DATA_OUT_PRESS_XL R Pressure offset registers FIFO status registers Status register Pressure output registers Temperature output registers 2D - 3B - Reserved 3C Output Low-pass filter reset register 3D - 77 - Reserved 78 Output FIFO_DATA_OUT_PRESS_L R 79 Output FIFO_DATA_OUT_PRESS_H R 7A Output FIFO_DATA_OUT_TEMP_L R 7B Output FIFO_DATA_OUT_TEMP_H R 7C Output FIFO pressure output registers FIFO temperature output registers page 31/55 LPS27HHTW Register mapping Registers marked as Reserved must not be changed. Writing to those registers may cause permanent damage to the device. To guarantee the proper behavior of the device, all register addresses not listed in the above table must not be accessed and the content stored in those registers must not be changed. The content of the registers that are loaded at boot should not be changed. They contain the factory calibration values. Their content is automatically restored when the device is powered up. DS13489 - Rev 1 page 32/55 LPS27HHTW Register description 9 Register description The device contains a set of registers which are used to control its behavior and to retrieve pressure and temperature data. The register address, made up of 7 bits, is used to identify them and to read/write the data through the serial interface. 9.1 INTERRUPT_CFG (0Bh) Interrupt mode for pressure acquisition configuration (R/W) 7 6 5 4 3 2 1 0 AUTOREFP RESET_ARP AUTOZERO RESET_AZ DIFF_EN LIR PLE PHE AUTOREFP RESET_ARP AUTOZERO RESET_AZ DIFF_EN LIR Enable AUTOREFP function. Default value: 0 (0: normal mode; 1: AUTOREFP enabled) Reset AUTOREFP function. Default value: 0 (0: normal mode; 1: reset AUTOREFP function) Enable AUTOZERO function. Default value: 0 (0: normal mode; 1: AUTOZERO enabled) Reset AUTOZERO function. Default value: 0 (0: normal mode; 1: reset AUTOZERO function) Enable interrupt generation. Default value: 0 (0: interrupt generation disabled; 1: interrupt generation enabled) Latch interrupt request to the INT_SOURCE (24h) register. Default value: 0 (0: interrupt request not latched; 1: interrupt request latched) Enable interrupt generation on pressure low event. Default value: 0 PLE (0: disable interrupt request; 1: enable interrupt request on pressure value lower than preset threshold) Enable interrupt generation on pressure high event. Default value: 0 PHE (0: disable interrupt request; 1: enable interrupt request on pressure value higher than preset threshold) Referring to Figure 25. “Threshold-based” interrupt event, the LPS27HHTW can be set by the user to support the interrupt function when P_DIFF_IN (defined below) is higher or lower than the threshold value stored in THS_P_L (0Ch) and THS_P_H (0Dh). It is enabled when the DIFF_EN bit in the INTERRUPT_CFG (0Bh) register is set to '1' and either PHE bit or PLE bit (or both bits) = '1'. Then, the differential pressure can be compared to a user-defined threshold stored in the 15-bit THS_P (0Ch and 0Dh) registers. The threshold pressure value defined by the user is a 15-bit unsigned value in the 16-bit register composed of THS_P_L (0Ch) and THS_P_H (0Dh). The value is: THS_P (15-bit unsigned) = Desired Interrupt threshold (hPa) x 16 The PHE and PLE bits in INTERRUPT_CFG (0Bh) enable the differential pressure interrupt generation on the positive or negative event respectively. The differential interrupt must be used with AUTOREFP or AUTOZERO mode. DS13489 - Rev 1 page 33/55 LPS27HHTW INTERRUPT_CFG (0Bh) Figure 25. “Threshold-based” interrupt event Threshold positive value Positive P_DIFF_IN Threshold negative value Negative To enable the AUTOZERO mode, the AUTOZERO bit must be set to '1' and then the measured pressure value is used as the reference and stored in the register REF_P (REF_P_L (15h), REF_P_H (16h)). From this point on, the output pressure value (PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah)) is updated with the difference between the measured pressure and REF_P. • P_DIFF_IN = measured pressure - REF_P • PRESS_OUT = measured pressure - REF_P After the first conversion, the AUTOZERO bit is automatically set back to '0'. In order to return back to normal mode, the RESET_AZ bit in the INTERRUPT_CFG (0Bh) register has to be set to '1'. This also resets the content of the REF_P registers to 0. AUTOREFP mode allows using the pressure differential for the generation of the interrupt keeping the output pressure registers PRESS_OUT (PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah)) without comparing REF_P. If the AUTOREFP bit is set to '1', the measured output pressure is used as the reference in the register REF_P (REF_P_L (15h), REF_P_H (16h)) for interrupt generation with following: • P_DIFF_IN = measured pressure - REF_P The output registers PRESS_OUT (28h, 29h and 2Ah) are not changed by REF_P and shows as follows. • PRESS_OUT = measured pressure After the first conversion, the AUTOREFP bit is automatically set to '0'. In order to return back to normal mode, the RESET_ARP bit has to be set to '1' DS13489 - Rev 1 page 34/55 LPS27HHTW THS_P_L (0Ch) 9.2 THS_P_L (0Ch) User-defined threshold value for pressure interrupt event (least significant bits) (R/W) 7 6 5 4 3 2 1 0 THS7 THS6 THS5 THS4 THS3 THS2 THS1 THS0 THS[7:0] This register contains the low part of threshold value for pressure interrupt generation. Default value: 00h The threshold value for pressure interrupt generation is a 15-bit unsigned right-justified value composed of THS_P_H (0Dh) and THS_P_L (0Ch).The value is expressed as: THS_P (15-bit unsigned) = Desired interrupt threshold (hPa) x 16 To enable the interrupt event based on this user-defined threshold, the DIFF_EN bit in INTERRUPT_CFG (0Bh) must be set to '1', the PHE bit or PLE bit (or both bits) in INTERRUPT_CFG (0Bh) has to be enabled. 9.3 THS_P_H (0Dh) User-defined threshold value for pressure interrupt event (most significant bits) (R/W) 7 6 5 4 3 2 1 0 - THS14 THS13 THS12 THS11 THS10 THS9 THS8 THS[14:8] This register contains the high part of threshold value for pressure interrupt generation. Default value: 00h Refer to THS_P_L (0Ch). 9.4 IF_CTRL (0Eh) Interface control register (R/W) 7 6 5 4 3 2 1 0 INT_EN_I3C 0 0 SDA_PU_EN SDO_PU_EN PD_DIS_INT1 I3C_DISABLE I2C_DISABLE INT_EN_I3C SDA_PU_EN SDO_PU_EN PD_DIS_INT1 I3C_DISABLE(1) I2C_DISABLE(2) Enable INT1 pad with MIPI I3CSM. If the INT_EN_I3C bit is set, the INT1 pad is polarized as OUT. Default value: 0 (0: INT1 disabled with MIPI I3CSM; 1: INT1 enabled with MIPI I3CSM) Enable pull-up on the SDA pin. Default value: 0 (0: SDA pin pull-up disconnected; 1: SDA pin with pull-up) Enable pull-up on the SDO pin. Default value: 0 (0: SDO pin pull-up disconnected; 1: SDO pin with pull-up) Disable pull down on the INT1 pin. Default value: 0 (0: INT1 pin with pull-down; 1: INT1 pin pull-down disconnected) Disable MIPI I3CSM interface. Default value: 0 (0: MIPI I3CSM enabled; 1: MIPI I3CSM disabled) Disable I²C interface. Default value: 0 (0: I²C enabled; 1: I²C disabled) 1. I3C_DISABLE bit disables the MIPI I3CSM communication protocol. 2. I2C_DISABLE bit disables the I²C interface, by default both SPI and I²C interfaces are enabled. DS13489 - Rev 1 page 35/55 LPS27HHTW WHO_AM_I (0Fh) 9.5 WHO_AM_I (0Fh) Device Who am I 7 6 5 4 3 2 1 0 1 0 1 1 0 0 1 1 9.6 CTRL_REG1 (10h) Control register 1 (R/W) 7 6 5 4 3 2 1 0 0 ODR2 ODR1 ODR0 EN_LPFP LPFP_CFG BDU SIM ODR[2:0] EN_LPFP LPFP_CFG Output data rate selection. Default value: 000 Refer to Table 18. Enable low-pass filter on pressure data when Continuous mode is used. Default value: 0 (0: Low-pass filter disabled; 1: Low-pass filter enabled) LPFP_CFG: Low-pass configuration register. Default value: 0 Refer to Table 19. Block data update. Default value: 0 BDU(1) (0: continuous update; 1: output registers not updated until MSB and LSB have been read) SIM SPI Serial Interface Mode selection. Default value: 0 (0: 4-wire interface; 1: 3-wire interface) 1. To guarantee the correct behavior of BDU feature, PRESS_OUT_H (2Ah) must be the last address read. Table 18. Output data rate bit configurations ODR[2:0] Temperature, Pressure (Hz) 000 One-shot 001 1 Hz 010 10 Hz 011 25 Hz 100 50 Hz 101 75 Hz 110(1) 100 Hz 111(1) 200 Hz 1. This option disables the low-noise mode automatically. When the ODR bits are set to '000', the device is in Power-down mode. When the device is in power-down mode, almost all internal blocks of the device are switched off to minimize power consumption. The I²C interface is still active to allow communication with the device. The content of the configuration registers is preserved and output data registers are not updated, therefore keeping the last data sampled in memory before going into power-down mode. If the ONE_SHOT bit in CTRL_REG2 (11h) is set to '1', One-shot mode is triggered and a new acquisition starts when it is required. Enabling this mode is possible only if the device was previously in power-down mode (ODR bits set to '000'). Once the acquisition is completed and the output registers updated, the device automatically enters in power-down mode. ONE_SHOT bit self-clears itself. DS13489 - Rev 1 page 36/55 LPS27HHTW CTRL_REG2 (11h) When the ODR bits are set to a value different than '000', the device is in Continuous mode and automatically acquires a set of data (pressure and temperature) at the frequency selected through the ODR[2:0] bits. Once the additional low-pass filter has been enabled through the EN_LPFP bit, it is possible to configure the device bandwidth acting on the LPFP_CFG bit. See Table 19 for low-pass filter configurations. Table 19. Low-pass filter configurations EN_LPFP LPFP_CFG Additional low-pass filter status Device bandwidth 0 x Disabled ODR/2 1 0 Enabled ODR/9 1 1 Enabled ODR/20 The BDU bit is used to inhibit the update of the output registers until both upper and lower (and XLOW) register parts are read. In default mode (BDU = ‘0’) the output register values are updated continuously. If for any reason it is not sure to read faster than the output data rate, it is recommended to set the BDU bit to ‘1’. In this way, the content of the output registers is not updated until MSB, LSB and XLSB have been read which avoids reading values related to different sample times. 9.7 CTRL_REG2 (11h) Control register 2 (R/W) 7 6 5 4 3 2 1 0 BOOT INT_H_L PP_OD IF_ADD_INC 0 SWRESET LOW_NOISE_EN ONE_SHOT Reboots memory content. Default value: 0 BOOT (0: normal mode; 1: reboot memory content) Interrupt active-high, active-low. Default value: 0 INT_H_L (0: active high; 1: active low) Push-pull/open-drain selection on interrupt pad. Default value: 0 PP_OD (0: push-pull; 1: open-drain) Register address automatically incremented during a multiple byte access with a serial interface (I²C or SPI). IF_ADD_INC Default value: 1 (0: disable; 1: enable) Software reset. Default value: 0 SWRESET (0: normal mode; 1: software reset). The bit is self-cleared when the reset is completed. LOW_NOISE_EN ONE_SHOT Enables low noise (used only if ODR is lower than 100 Hz). Default value: 0 (0: low-current mode; 1: low-noise mode) Enables one-shot. Default value: 0 (0: idle mode; 1: a new dataset is acquired) The BOOT bit is used to refresh the content of the internal registers stored in the Flash memory block. At device power-up, the content of the Flash memory block is transferred to the internal registers related to the trimming functions to allow correct behavior of the device itself. If for any reason the content of the trimming registers is modified, it is sufficient to use this bit to restore the correct values. When the BOOT bit is set to '1', the content of the internal Flash is copied into the corresponding internal registers and is used to calibrate the device. These values are factory trimmed and they are different for every device. They allow the correct behavior of the device and normally they should not be changed. At the end of the boot process, the BOOT bit is set again to '0' by hardware. The BOOT bit takes effect immediately after it is set to 1. DS13489 - Rev 1 page 37/55 LPS27HHTW CTRL_REG2 (11h) INT_H_L selects an interrupt active-high/low value. PP_OD selects push-pull/open-drain on the interrupt pad. The IF_ADD_INC bit enables the address to be automatically incremented during a multiple byte access with a serial interface (SPI or I²C). The SWRESET bit resets the volatile registers to default value ‘0’. It returns to ‘0’ by hardware. LOW_NOISE_EN is disabled by default and must be changed when the device is in power-down mode. It enables low-noise mode but can be used when the ODR is lower than 100 Hz. If ODR = 100 Hz or ODR = 200 Hz, this option is automatically switched off and the value of the low-noise enable bit is ignored. LOW_NOISE_EN mode is enabled to have less RMS noise and the best performance is achieved with LOW_NOISE_EN set to 1 and filter at ODR/20. Depending on the application, the LOW_NOISE_EN bit can be enabled (low-noise mode) or disabled (low-current mode) to have less RMS noise or less power consumption (refer to the following table). Table 20. RMS noise and power consumption Mode Additional low-pass filter status Device bandwidth Disabled Low noise Supply current @ ODR = 1 Hz [µA] 1.8 12 Enabled ODR/9 1 12 Enabled ODR/20 0.7 12 5.6 4 Disabled Low current RMS noise [Pa] Enabled ODR/9 3.2 4 Enabled ODR/20 2.1 4 The ONE_SHOT bit is used to start a new conversion when the ODR[2:0] bits in CTRL_REG1 (10h) are set to '000'. Writing a '1' in ONE_SHOT triggers a single measurement of pressure and temperature. Once the measurement is done, the ONE_SHOT bit will self-clear, the new data are available in the output registers, and the STATUS (27h) bits are updated. DS13489 - Rev 1 page 38/55 LPS27HHTW CTRL_REG3 (12h) 9.8 CTRL_REG3 (12h) Control register 3 - INT_DRDY pin control register (R/W) 7 6 5 4 3 2 1 0 0 0 INT_F_FULL INT_F_WTM INT_F_OVR DRDY INT_S1 INT_S0 FIFO full flag on INT_DRDY pin. Default value: 0 INT_F_FULL (0: FIFO empty; 1: FIFO full - 128 unread samples) FIFO threshold (watermark) status on INT_DRDY pin. Default value: 0 INT_F_WTM (0: FIFO is lower than FTH level; 1: FIFO is equal to or higher than FTH level) FIFO overrun status on INT_DRDY pin. Default value: 0 INT_F_OVR (0: not overwritten; 1: at least one sample in the FIFO has been overwritten) Data-ready signal on INT_DRDY pin. Default value: 0 DRDY (0: disable; 1: enable) Data signal on INT_DRDY pin control bits. Default value: 00 INT_S[1:0] Refer to Table 21. Table 21. Interrupt configurations INT_S1 INT_S0 0 0 Data signal (in order of priority: DRDY or INT_F_WTM or INT_F_OVR or INT_F_FULL) 0 1 Pressure high (P_high) 1 0 Pressure low (P_low) 1 1 Pressure low OR high INT_DRDY pin configuration Figure 26. Interrupt events on INT_DRDY pin CTRL_REG3 (@12h) New data set is available DRDY FIFO Threshold (Watermark) INT_F_WTM FIFO Overrun INT_F_OVR FIFO Full INT_F_FULL INT_S[1:0] 00 Pressure higher than threshold 01 Pressure lower than threshold 10 INT_DRDY pin 11 DS13489 - Rev 1 page 39/55 LPS27HHTW FIFO_CTRL (13h) 9.9 FIFO_CTRL (13h) FIFO control register (R/W) 7 6 5 4 3 2 1 0 0 0 0 0 STOP_ON_WTM TRIG_MODES F_MODE1 F_MODE0 Stop-on-FIFO watermark. Enables FIFO watermark level use. Default value: 0 STOP_ON_WTM (0: disable; 1: enable) TRIG_MODES Enables triggered FIFO modes. Default value: 0 Selects triggered FIFO modes. Default value: 00 F_MODE[1:0] Refer to Table 22. Table 22. FIFO mode selection TRIG_MODES F_MODE[1:0] Mode x 00 Bypass 0 01 FIFO mode 0 1x Continuous (Dynamic-Stream) 1 01 Bypass-to-FIFO 1 10 Bypass-to-Continuous (Dynamic-Stream) 1 11 Continuous (Dynamic-Stream)-to-FIFO The STOP_ON_WTM bit enables the use of the FIFO watermark level: when the number of samples in FIFO is equal to the watermark level (set using the WTM[4:0] bits in FIFO_WTM (14h)) then FIFO is full. The TRIG_MODES bit enables the triggered FIFO modes. The F_MODE[1:0] bits select one of the FIFO modes as described in Table 22. Output data (pressure and temperature) are read through FIFO_DATA_OUT_PRESS_XL (78h), FIFO_DATA_OUT_PRESS_L (79h), FIFO_DATA_OUT_PRESS_H (7Ah),FIFO_DATA_OUT_TEMP_L (7Bh) and FIFO_DATA_OUT_TEMP_H (7Ch); both single read and multiple read operations can be used. FIFO_WTM (14h) 9.10 FIFO threshold setting register (R/W) 7 6 5 4 3 2 1 0 0 WTM6 WTM5 WTM4 WTM3 WTM2 WTM1 WTM0 WTM[6:0] DS13489 - Rev 1 FIFO threshold. Watermark level setting. Default value: 0000000 page 40/55 LPS27HHTW REF_P_L (15h) 9.11 REF_P_L (15h) Reference pressure LSB data (R) 7 6 5 4 3 2 1 0 REFL7 REFL6 REFL5 REFL4 REFL3 REFL2 REFL1 REFL0 REFL[7:0] This register contains the low part of the reference pressure value. Default value: 00000000 The Reference pressure value is 16-bit data and it is composed of REF_P_H (16h) and REF_P_L (15h). The value is expressed as 2’s complement. The reference pressure value is stored and used when the AUTOZERO or AUTOREFP function is enabled. Please refer to the INTERRUPT_CFG (0Bh) register description. 9.12 REF_P_H (16h) Reference pressure MSB data (R) 7 6 5 4 3 2 1 0 REFL15 REFL14 REFL13 REFL12 REFL11 REFL10 REFL9 REFL8 REFL[15:8] 9.13 This register contains the high part of the reference pressure value. Default value: 00000000 RPDS_L (18h) Pressure offset (LSB data) 7 6 5 4 3 2 1 0 RPDS7 RPDS6 RPDS5 RPDS4 RPDS3 RPDS2 RPDS1 RPDS0 RPDS[7:0] This register contains the low part of the pressure offset value. Default value: 00000000 The pressure offset value is 16-bit data that can be used to implement one-point calibration (OPC) after soldering. This value is composed of RPDS_H (19h) and RPDS_L (18h). The value is expressed as 2’s complement. 9.14 RPDS_H (19h) Pressure offset (MSB data) 7 6 5 4 3 2 1 0 RPDS15 RPDS14 RPDS13 RPDS12 RPDS11 RPDS10 RPDS9 RPDS8 RPDS[15:8] DS13489 - Rev 1 This register contains the high part of the pressure offset value. Default value: 00000000 Refer to RPDS_L (18h). page 41/55 LPS27HHTW INT_SOURCE (24h) 9.15 INT_SOURCE (24h) Interrupt source (read only) 7 6 5 4 3 2 1 0 BOOT_ON 0 0 0 0 IA PL PH Indication of Boot phase. BOOT_ON (0: Boot phase has ended; 1: Boot phase is running). Interrupt active. IA (0: no interrupt has been generated; 1: one or more interrupt events have been generated). Differential pressure Low. PL (0: no interrupt has been generated; 1: low differential pressure event has occurred). Differential pressure High. PH (0: no interrupt has been generated; 1: high differential pressure event has occurred). 9.16 FIFO_STATUS1 (25h) FIFO status register (read only) 7 6 5 4 3 2 1 0 FSS7 FSS6 FSS5 FSS4 FSS3 FSS2 FSS1 FSS0 FIFO stored data level, number of unread samples stored in FIFO. FSS[7:0] 9.17 (00000000: FIFO empty; 10000000: FIFO full, 128 unread samples) FIFO_STATUS2 (26h) FIFO status register (read only) 7 6 5 4 3 2 1 0 FIFO_WTM_IA FIFO_OVR_IA FIFO_FULL_IA - - - - - FIFO threshold (watermark) status. Default value: 0 FIFO_WTM_IA (0: FIFO filling is lower than treshold level; 1: FIFO filling is equal or higher than treshold level). FIFO overrun status. Default value: 0 FIFO_OVR_IA (0: FIFO is not completely full; 1: FIFO is full and at least one sample in the FIFO has been overwritten). FIFO full status. Default value: 0 FIFO_FULL_IA (0: FIFO is not completely filled; 1: FIFO is completely filled, no samples overwritten) DS13489 - Rev 1 page 42/55 LPS27HHTW STATUS (27h) 9.18 STATUS (27h) Status register (read only) 7 6 5 4 3 2 1 0 - - T_OR P_OR - - T_DA P_DA Temperature data overrun. T_OR (0: no overrun has occurred; 1: a new data for temperature has overwritten the previous data) Pressure data overrun. P_OR (0: no overrun has occurred; 1: new data for pressure has overwritten the previous data) Temperature data available. T_DA (0: new data for temperature is not yet available; 1: a new temperature data is generated) Pressure data available. P_DA (0: new data for pressure is not yet available; 1: a new pressure data is generated) This register is updated every ODR cycle. PRESS_OUT_XL (28h) 9.19 Pressure output value LSB data (read only) 7 6 5 4 3 2 1 0 POUT7 POUT6 POUT5 POUT4 POUT3 POUT2 POUT1 POUT0 POUT[7:0] This register contains the low part of the pressure output value. The pressure output value is a 24-bit data that contains the measured pressure. It is composed of PRESS_OUT_H (2Ah), PRESS_OUT_L (29h) and PRESS_OUT_XL (28h). The value is expressed as 2’s complement. The output pressure register PRESS_OUT is provided as the difference between the measured pressure and the content of the register RPDS (18h, 19h)*. Please refer to Section 4.5 Interpreting pressure readings for additional info. *DIFF_EN = '0', AUTOZERO = '0', AUTOREFP = '0' 9.20 PRESS_OUT_L (29h) Pressure output value middle data (read only) 7 6 5 4 3 2 1 0 POUT15 POUT14 POUT13 POUT12 POUT11 POUT10 POUT9 POUT8 POUT[15:8] DS13489 - Rev 1 This register contains the mid part of the pressure output value. Refer to PRESS_OUT_XL (28h). page 43/55 LPS27HHTW PRESS_OUT_H (2Ah) 9.21 PRESS_OUT_H (2Ah) Pressure output value MSB data (read only) 7 6 5 4 3 2 1 0 POUT23 POUT22 POUT21 POUT20 POUT19 POUT18 POUT7 POUT16 POUT[23:16] 9.22 This register contains the high part of the pressure output value. Refer to PRESS_OUT_XL (28h). TEMP_OUT_L (2Bh) Temperature output value LSB data (read only) 7 6 5 4 3 2 1 0 TOUT7 TOUT6 TOUT5 TOUT4 TOUT3 TOUT2 TOUT1 TOUT0 TOUT[7:0] This register contains the low part of the temperature output value. The temperature output value is 16-bit data that contains the measured temperature. It is composed of TEMP_OUT_H (2Ch) and TEMP_OUT_L (2Bh). The value is expressed as 2’s complement. 9.23 TEMP_OUT_H (2Ch) Temperature output value MSB data (read only) 7 6 5 4 3 2 1 0 TOUT15 TOUT14 TOUT13 TOUT12 TOUT11 TOUT10 TOUT9 TOUT8 TOUT[15:8] 9.24 This register contains the high part of the temperature output value. LPFP_RES (3Ch) Low-pass filter reset (read only) If the LPFP is active, in order to avoid the transitory phase, the filter can be reset by reading this register before generating pressure measurements. 9.25 FIFO_DATA_OUT_PRESS_XL (78h) FIFO pressure output LSB data (read only) 7 6 5 4 3 2 1 0 FIFO_P7 FIFO_P6 FIFO_P5 FIFO_P4 FIFO_P3 FIFO_P2 FIFO_P1 FIFO_P1 FIFO_P[7:0] DS13489 - Rev 1 Pressure LSB data in FIFO buffer page 44/55 LPS27HHTW FIFO_DATA_OUT_PRESS_L (79h) 9.26 FIFO_DATA_OUT_PRESS_L (79h) FIFO pressure output middle data (read only) 7 6 5 4 3 2 1 0 FIFO_P15 FIFO_P14 FIFO_P13 FIFO_P12 FIFO_P11 FIFO_P10 FIFO_P9 FIFO_P8 FIFO_P[15:8] 9.27 Pressure middle data in FIFO buffer FIFO_DATA_OUT_PRESS_H (7Ah) FIFO pressure output MSB data (read only) 7 6 5 4 3 2 1 0 FIFO_P23 FIFO_P22 FIFO_P21 FIFO_P20 FIFO_P19 FIFO_P18 FIFO_P17 FIFO_P16 FIFO_P[23:16] 9.28 Pressure MSB data in FIFO buffer FIFO_DATA_OUT_TEMP_L (7Bh) FIFO temperature output LSB data (read only) 7 6 5 4 3 2 1 0 FIFO_T7 FIFO_T6 FIFO_T5 FIFO_T4 FIFO_T3 FIFO_T2 FIFO_T1 FIFO_T0 FIFO_T[7:0] 9.29 Temperature LSB data in FIFO buffer FIFO_DATA_OUT_TEMP_H (7Ch) Temperature LSB data in FIFO buffer 7 6 5 4 3 2 1 0 FIFO_T15 FIFO_T14 FIFO_T13 FIFO_T12 FIFO_T11 FIFO_T10 FIFO_T9 FIFO_T8 FIFO_T[15:8] DS13489 - Rev 1 Temperature MSB data in FIFO buffer page 45/55 LPS27HHTW Package information 10 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. 10.1 CCLGA-10L package information Figure 27. CCLGA - 10L (2.7 x 2.7 x 1.7 typ. mm) package outline and mechanical data Dimensions are in millimeter unless otherwise specified General Tolerance is +/-0.10mm unless otherwise specified OUTER DIMENSIONS ITEM Length [L] W idth [W ] Height [H] DIMENSION [mm] 2.7 2.7 1.85 MAX TOLERANCE [mm] ±0.15 ±0.15 / DM00492423_1 DS13489 - Rev 1 page 46/55 LPS27HHTW CCLGA-10L packing information 10.2 CCLGA-10L packing information Figure 28. Carrier tape information for CCLGA-10L package Figure 29. Package orientation in carrier tape DS13489 - Rev 1 page 47/55 LPS27HHTW CCLGA-10L packing information Figure 30. Reel information for carrier tape of CCLGA-10L package T 40mm min. Access hole at slot location B C N D A Full radius G measured at hub Tape slot in core for tape start 2.5mm min. width Table 23. Reel dimensions for carrier tape of CCLGA-10L package Reel dimensions (mm) DS13489 - Rev 1 A (max) 330 B (min) 1.5 C 13 ±0.25 D (min) 20.2 N (min) 60 G 12.4 +2/-0 T (max) 18.4 page 48/55 LPS27HHTW Contents Contents 1 Block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 3 Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.1 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.2 Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3 Communication interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.4 4 5 6 SPI - serial peripheral interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.3.2 I²C - inter-IC control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 4.1 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.3 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.4 Device structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.5 Interpreting pressure readings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4.6 Interpreting temperature readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 FIFO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5.1 Bypass mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.2 FIFO mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.3 Continuous (Dynamic-Stream) mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.4 Bypass-to-FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5.5 Bypass-to-Continuous (Dynamic-Stream) mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.6 Continuous (Dynamic-Stream)-to-FIFO mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.7 Retrieving data from FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 6.1 7 3.3.1 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Digital interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 7.1 Serial interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.2 I²C serial interface (CS = high) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 DS13489 - Rev 1 page 49/55 LPS27HHTW Contents 7.2.1 7.3 7.4 SPI bus interface (CS = low) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.3.1 SPI read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7.3.2 SPI write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7.3.3 SPI read in 3-wire mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 MIPI I3CSM slave interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7.4.1 7.5 I²C operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 MIPI I3CSM CCC supported commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 I²C/MIPI I3CSM coexistence in LPS27HHTW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 8 Register mapping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 9 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33 9.1 INTERRUPT_CFG (0Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 9.2 THS_P_L (0Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9.3 THS_P_H (0Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9.4 IF_CTRL (0Eh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9.5 WHO_AM_I (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.6 CTRL_REG1 (10h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.7 CTRL_REG2 (11h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 9.8 CTRL_REG3 (12h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 9.9 FIFO_CTRL (13h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.10 FIFO_WTM (14h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 9.11 REF_P_L (15h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.12 REF_P_H (16h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.13 RPDS_L (18h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.14 RPDS_H (19h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 9.15 INT_SOURCE (24h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9.16 FIFO_STATUS1 (25h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9.17 FIFO_STATUS2 (26h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9.18 STATUS (27h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 9.19 PRESS_OUT_XL (28h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 9.20 PRESS_OUT_L (29h). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 9.21 PRESS_OUT_H (2Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 DS13489 - Rev 1 page 50/55 LPS27HHTW Contents 10 9.22 TEMP_OUT_L (2Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.23 TEMP_OUT_H (2Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.24 LPFP_RES (3Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.25 FIFO_DATA_OUT_PRESS_XL (78h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.26 FIFO_DATA_OUT_PRESS_L (79h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.27 FIFO_DATA_OUT_PRESS_H (7Ah). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.28 FIFO_DATA_OUT_TEMP_L (7Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 9.29 FIFO_DATA_OUT_TEMP_H (7Ch). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 10.1 CCLGA-10L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 10.2 CCLGA-10L packing information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 List of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52 List of figures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54 DS13489 - Rev 1 page 51/55 LPS27HHTW List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressure and temperature sensor characteristics . . . . . . . . . . . . . . . . . . . . Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SPI slave timing values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I²C slave timing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Potting gel properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Serial interface pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I²C terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAD+Read/Write patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer when master is writing one byte to slave. . . . . . . . . . . . . . . . . . . . Transfer when master is writing multiple bytes to slave . . . . . . . . . . . . . . . . Transfer when master is receiving (reading) one byte of data from slave . . . . Transfer when master is receiving (reading) multiple bytes of data from slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . 4 . 5 . 5 . 6 . 7 . 8 10 21 21 22 22 22 22 23 Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. MIPI I3CSM CCC commands . . . . . . . . . . . . . . . . . . . . Registers address map . . . . . . . . . . . . . . . . . . . . . . . . Output data rate bit configurations . . . . . . . . . . . . . . . . Low-pass filter configurations . . . . . . . . . . . . . . . . . . . RMS noise and power consumption . . . . . . . . . . . . . . . Interrupt configurations . . . . . . . . . . . . . . . . . . . . . . . . FIFO mode selection . . . . . . . . . . . . . . . . . . . . . . . . . Reel dimensions for carrier tape of CCLGA-10L package Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 31 36 37 38 39 40 48 54 DS13489 - Rev 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 52/55 LPS27HHTW List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Device architecture block diagram. . . . . . . . . . . Digital logic . . . . . . . . . . . . . . . . . . . . . . . . . . Pin connections (bottom view) . . . . . . . . . . . . . SPI slave timing diagram . . . . . . . . . . . . . . . . . I²C slave timing diagram . . . . . . . . . . . . . . . . . LPS27HHTW internal structure . . . . . . . . . . . . . Pressure readings. . . . . . . . . . . . . . . . . . . . . . Temperature readings . . . . . . . . . . . . . . . . . . . Bypass mode . . . . . . . . . . . . . . . . . . . . . . . . . FIFO mode . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous (Dynamic-Stream) mode . . . . . . . . . Bypass-to-FIFO mode . . . . . . . . . . . . . . . . . . . Bypass-to-Continuous (Dynamic-Stream) mode . Continuous (Dynamic-Stream)-to-FIFO mode . . . LPS27HHTW electrical connections (top view) . . LPS27HHTW power-off sequence. . . . . . . . . . . Read and write protocol . . . . . . . . . . . . . . . . . . SPI read protocol . . . . . . . . . . . . . . . . . . . . . . Multiple byte SPI read protocol (2-byte example). SPI write protocol . . . . . . . . . . . . . . . . . . . . . . Multiple byte SPI write protocol (2-byte example) SPI read protocol in 3-wire mode . . . . . . . . . . . Figure 23. I²C and MIPI I3CSM both active (INT_DRDY pin not connected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Only MIPI I3CSM active (INT_DRDY pin connected to Vdd_IO) . . . . . . . . . . . “Threshold-based” interrupt event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrupt events on INT_DRDY pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CCLGA - 10L (2.7 x 2.7 x 1.7 typ. mm) package outline and mechanical data . Carrier tape information for CCLGA-10L package . . . . . . . . . . . . . . . . . . . . Package orientation in carrier tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reel information for carrier tape of CCLGA-10L package . . . . . . . . . . . . . . . DS13489 - Rev 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . 2 . 3 . 6 . 7 10 11 11 13 14 15 16 17 18 19 20 23 24 24 25 25 26 30 34 39 46 47 47 48 page 53/55 LPS27HHTW Revision history Table 24. Document revision history DS13489 - Rev 1 Date Version 12-Jan-2021 1 Changes Initial release page 54/55 LPS27HHTW IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2021 STMicroelectronics – All rights reserved DS13489 - Rev 1 page 55/55