DLLR-L10D-E1BD-C-NAV7

Standard Pressure Ranges ................................ 2 Pressure Sensor Maximum Ratings................... 2 Environmental Specifications ........................... 2 Electrical Block Diagram ................................. 2 Performance Characteristics ............................ 3 I2C / SPI Electrical Parameters ......................... 4 Device Ordering Options ................................ 5 Operation Overview ..................................... 6-7 Digital Interface Command Formats ................ 8 Digital Interface Data Format .......................... 9 The digital interface eases integration of the sensors into a wide range of process control and measurement systems, allowing direct connection to serial communications channels. For battery-powered systems, the sensors can enter very low-power mode between readings to minimize load on the power supply. These calibrated and compensated sensors provide accurate, stable output over a wide temperature range. This series is intended for use with non-corrosive, non-ionic working fluids such as air, dry gases. https://www.allsensors.com/products/dllr-series I2C Interface ............................................... 9-10 SPI Interface .................................................. 11 Interface Timing Diagrams ............................ 12 Extended Compensation Instructions ........ 13-15 How to Order Guide ..................................... 16 Dimensional Package Drawings SIP ..................................................... 17-18 DIP .................................................... 19-20 SMT ........................................................ 21 Suggested Pad Layout .................................... 22 All Sensors f 408 225 2079 Features & Applications ................................... 2 The DLLR Series Mini Digital Output Sensor is based on All Sensors’ CoBeam2 TM Technology. This reduces package stress susceptibility, resulting in improved overall long term stability and vastly improves the position sensitivity. a 16035 Vineyard Blvd. Morgan Hill, CA 95037 Table of Contents p 408 225 4314 Introduction e www.allsensors.com all sensors DLLR - High Accuracy Pressure Sensors Series DS-0358 Rev A Page 1 Applications • 10 & 30 inH2O Pressure Ranges • 1.68V to 3.6V Supply Voltage Range • I2C or SPI Interface (Automatically Selected) • Better Than 0.10% Accuracy • High Resolution 16/17/18 Bit Output • Medical Breathing • Environmental Controls • HVAC • Industrial Controls • Portable/Hand-Held Equipment Standard Pressure Ranges Operating Range Proof Pressure A Burst Pressure Nominal Span Pa inH2O kPa inH2O kPa Counts ± 10 2488.4 100 25 300 75 ±0.4 * 224 DLLR-L10G 0 to 10 2488.4 100 25 300 75 0.8 * 224 DLLR-L30D ± 30 7465.2 100 25 300 75 ±0.4 * 224 DLLR-L30G 0 to 30 7465.2 100 25 300 75 0.8 * 224 f 408 225 2079 inH2O DLLR-L10D Note A: Operating range in Pa is expressed as an approximate value. Supply Voltage (Vs) 3.63 Vdc Common Mode Pressure 10 psig Lead Temperature (soldering 2-4 sec.) 270 °C p 408 225 4314 Electrical Block Diagram Pressure Sensor Maximum Ratings For SIP Packages Vs SCL I2C SDA Gnd Environmental Specifications Temperature Ranges Compensated: Operating Storage Commercial For DIP and J-Lead Packages 0°C to 70°C -25°C to 85 °C -40°C to 125 °C Humidity Limits (non condensing) 0 to 95% RH SPI Vs SCLK MISO MOSI /SS EOC Gnd All Sensors Vs SCL - OR - I2C SDA EOC Gnd DS-0358 Rev A Page 2 Table of Contents a 16035 Vineyard Blvd. Morgan Hill, CA 95037 Device e www.allsensors.com Features all sensors DLLR Series High Accuracy Pressure Sensors Performance Characteristics for DLLR Series High Accuracy Low Pressure Sensors All parameters are measured at ±3.3V ±5% excitation and 25C unless otherwise specified (Note 9). Pressure measurements are with positive pressure applied to PORT B. Parameter Specification Minimum Typical Maximum Units LxxD - ±0.4 * 224 - Dec Count 1 LxxG - 0.8 * 224 - Dec Count 1 LxxD - 0.5 * 224 - Dec Count - LxxG - 0.1 * 2 24 - Dec Count - - ±0.10 ±6 ±9 ±0.03 ±0.25 ±0.10 %FSS ppmFSS/C ppmFSS/C %FSS 2, 6 4, 6 4, 6 3, 6 - ±0.06 ±7 ±3 ±0.03 ±0.20 ±0.10 %FSS ppmFSS/C ppmFSS/C %FSS 2, 6 4, 6 4, 6 3, 6 - ±0.10 ±10 ±4 ±0.03 ±0.35 ±0.10 %FSS ppmFSS/C ppmFSS/C %FSS 2, 6 4, 6 4, 6 3, 6 - ±0.05 ±6 ±3 ±0.03 ±0.15 ±0.10 %FSS ppmFSS/C ppmFSS/C %FSS 2, 6 4, 6 4, 6 3, 6 Offset Position Sensitivity (±1g) - ±0.10 - %FSS - Offset Long Term Drift (one year) - ±0.25 - %FSS - Notes Output Span Offset Output @ Zero Diff. Pressure (OSdig) Error Summary L10D Total Error Band Span Temperature Shift Offset Temperature Shift Accuracy L10G Total Error Band Span Temperature Shift Offset Temperature Shift Accuracy L30D Total Error Band Span Temperature Shift Offset Temperature Shift Accuracy L30G Total Error Band Span Temperature Shift Offset Temperature Shift Accuracy Pressure Digital Resolution - No Missing Codes 16-bit Option 15.7 - - bit - 17-bit Option 16.7 - - bit - 18-bit Option 17.7 - - bit - Resolution - 16 - bit - Overall Accuracy - 2 - °C - During Active State (ICCActive) - 2 2.6 mA - During Idle State (ICCIdle) - 100 250 nA - - - 2.5 ms 5 30 - - ms 10 Temperature Output 5, 7, 8 Supply Current Requirement Power On Delay Memory Read Access Time Data Update Time (tDU) (see table below) 5, 7 DLLR Series High Accuracy Digital Pressure Sensors Table of Contents Page 3 I2C / SPI Electrical Parameters for DLLR Symbol Min Typ Max Units Notes Input High Level - 80.0 - 100 % of Vs 5 Input Low Level - 0 - 20.0 % of Vs 5 Output Low Level - - - 10.0 % of Vs 5 I2C Pull-up Resistor - 1000 - - I2C Load Capacitance on SDA, @ 400 kHz CSDA - - 200 pF 5 I2C Input Capacitance (each pin) - - 10.0 pF 5 Pressure Output Transfer Function 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑑𝑑𝑑𝑑𝑑𝑑 − 𝑂𝑂𝑂𝑂𝑑𝑑𝑑𝑑𝑑𝑑 � × 𝐹𝐹𝐹𝐹𝐹𝐹(𝑖𝑖𝑖𝑖𝐻𝐻2 𝑂𝑂) 224 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑑𝑑𝑑𝑑𝑑𝑑 Is the sensor 24-bit digital output, following corrections applied by extended compensation. 𝑂𝑂𝑂𝑂𝑑𝑑𝑑𝑑𝑑𝑑 Is the specified digital offset 𝐹𝐹𝐹𝐹𝐹𝐹(𝑖𝑖𝑖𝑖𝐻𝐻2 𝑂𝑂) For Gage Operating Range sensors: For Differential Operating Range sensors: 24 0.1 * 2 24 0.5 * 2 f 408 225 2079 Where: e www.allsensors.com 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃(𝑖𝑖𝑖𝑖𝐻𝐻2 𝑂𝑂) = 1.25 × � The sensor Full Scale Span in inches H2O For Gage Operating Range sensors: For Differential Operating Range sensors: Full Scale Pressure 2 x Full Scale Pressure   p 408 225 4314    Temperature Output Transfer Function ����������� ��� � � ������� ∗ 125 � � ��  2�� Where:    �������   The sensor 24‐bit digital temperature output.  (Note that only the upper 16 bits are significant)  Specification Notes note 1: THE SPAN IS THE ALGEBRAIC DIFFERENCE BETWEEN FULL SCALE DECIMAL COUNTS AND THE OFFSET DECIMAL COUNTS. THE FULL SCALE PRESSURE IS THE note 2: TOTAL ERROR BAND CONSISTS OF OFFSET AND SPAN TEMPERATURE AND CALIBRATION ERRORS, LINEARITY AND PRESSURE HYSTERESIS ERRORS, OFFSET note 3: ACCURACY INCLUDES PRESSURE HYSTERESIS, REPEATABILITY AND BEST-FIT STRAIGHT LINE LINEARITY, EVALUATED AT 25C. note 4: PARTS PER MILLION OF FULL-SCALE SPAN PER DEGREE C. note 5: PARAMETER IS CHARACTERIZED AND NOT 100% TESTED. note 6: EVALUATED FOLLOWING CORRECTIONS DESCRIBED IN EXTENDED COMPENSATION SECTION. note 7: DATA UPDATE TIME IS EXCLUSIVE OF COMMUNICATIONS, FROM COMMAND RECEIVED TO END OF BUSY STATUS. THIS CAN BE OBSERVED AS EOC PIN note 8: AVERAGE CURRENT CAN BE ESTIMATED AS : ICCIdle + (tDU / Reading Interval) * ICCActive). REFER TO FIGURE 2 FOR ACTIVE AND IDLE CONDITIONS OF THE note 9: THE SENSOR IS CALIBRATED WITH A 3.3V SUPPLY HOWEVER, AN INTERNAL REGULATOR ALLOWS A SUPPLY VOLTAGE OF 1.68V TO 3.6V TO BE USED note 10: DELAY BETWEEN END OF MEMORY READ REQUEST COMMUNICATION AND START OF MEMORY DATA READ COMMUNICATION. MAXIMUM POSITIVE CALIBRATED PRESSURE. WARM-UP SHIFT, OFFSET POSITION SENSITIVITY AND LONG TERM OFFSET DRIFT ERRORS. LOW- STATE DURATION. SENSOR (THE ACTIVE STATE IS WHILE EOC PIN IS LOW). WITHOUT AFFECTING THE OVERALL SPECIFICATIONS. THIS ALLOWS DIRECT OPERATION FROM A BATTERY SUPPLY. All Sensors Table of Contents all sensors CI2C_IN Ω 5 DS-0358 Rev A Page 4 a 16035 Vineyard Blvd. Morgan Hill, CA 95037 Parameter Device Ordering Options Output Resolution Calibrated output resolution can be ordered to be 16, 17, or 18 bits. Higher resolution results in slower update times; see the Data Update Time in the Performance Characteristics table. DLLR Series High Accuracy Digital Pressure Sensors Table of Contents Page 5 Operation Overview The DLLR is a digital sensor with a signal path that includes a sensing element, a variable- bit analog to digital converter, a DSP and an IO block that supports either an I2C or SPI interface (see Figure 1 below). The sensor also includes an internal temperature reference and associated control logic to support the configured operating mode. Since there is a single ADC, there is also a multiplexer at the front end of the ADC that selects the signal source for the ADC. Sensor Commands: Five Measurement commands are supported, returning values of either a single pressure / temperature reading or an average of 2, 4, 8, or 16 readings. Each of these commands wakes the sensor from Idle state into Active state, and starts a measurement cycle. For the Start-Average commands, this cycle is repeated the appropriate numper of times, while the Start-Single command performs a single iteration. When the DSP has completed calculations and the new values have been made available to the I/O block, the sensor returns to Idle state. The sensor remains in this low-power state until another Measurement command is received. After completion of the measurement, the result may then be read using the Data Read command. The ADC and DSP remain in Idle state, and the I/O block returns the 7 bytes of status and measurement data. See Figure 2, following. At any time, the host may request current device status with the Status Read command. See Table 1 for a summary of all commands. For optimum sensor performance, All Sensors recommends that Measurement commands be issued at a fixed interval by the host system. Irregular request intervals may increase overall noise on the output. Furthermore, if reading intervals are much slower than the Device Update Time, using the Averaging commands is suggested to reduce offset shift. This shift is constant with respect to time interval, and may be removed by the application. For longer fixed reading intervals, this shift may be removed by the factory on special request. I/O Interface Configuration: The sensor automatically selects SPI or I2C serial interface, based on the following protocol: If the /SS input is set low by the host (as occurs during a SPI command transaction), the I/O interface will remain configured for SPI communications until power is removed. Otherwise, once a valid device address and command have been received over the I2C interface, the I/O interface will remain configured for I2C until power is removed. NOTE: The four-pin (SIP) packages only support the I2C interface. All Sensors Table of Contents DS-0358 Rev A Page 6 f 408 225 2079 p 408 225 4314 The DSP receives the converted pressure and temperature information and applies a multi-order transfer function to compensate the pressure output. This transfer function includes compensation for span, offset, temperature effects on span, temperature effects on offset and second order temperature effects on offset. There is also linearity compensation for gage devices and front to back linearity compensation for differential devices. This compensated output is further improved by applying additional external correction, as described later in the Extended Compensation instructions section. a 16035 Vineyard Blvd. Morgan Hill, CA 95037 The ADC performs conversions on the raw sensor signal (P), the temperature reference (T) and a zero reference (Z) during the ADC measurement cycle. e www.allsensors.com all sensors Figure 1 - DLLR Block Diagram Operation Overview Figure 2 - DLLR Communication Start-Single Command Command Start-Single Internal State Idle Interal Operation Idle Data Read Active Start-Single Idle ADC (Temp, Zero, Pressure) Idle DSP Idle Active ADC (Temp, Zero, Pressure) Idle DSP New Data Available EOC Start-Average2 / 4 / 8 / 16 Commands (Auto Averaging) Command Data Read Start-Average2/ 4/ 8/ 16 Internal State Idle Interal Operation Idle Active ADC (Temp, Zero, Pressure) 1 ADC (Temp, Zero, Pressure) n DSP Start-Average2/ 4/ 8/ 16 Idle Active Idle ADC (T, Z, P)… New Data Available EOC Digital Interface Command Formats When requesting the start of a measurement, the command length for I2C is 1 byte, for SPI it is 3 bytes. When requesting sensor status over I2C, the host simply performs a 1-byte read transfer. When requesting sensor status over SPI, the host must send the Status Read command byte while reading 1 byte. When reading sensor data over I2C, the host simply performs a 7-byte read transfer. When reading sensor data over SPI, the host must send the 7-byte Data Read command while reading the data. SENDING UNDOCUMENTED COMMANDS TO SENSOR WILL CORRUPT CALIBRATION AND IS NOT COVERED BY WARRANTY. Table 1 - DLLR Sensor Command Set Measurement Commands Description SPI ( 3 bytes ) I2C ( 1 byte) Start-Single 0xAA 0x00 0x00 0xAA Start-Average2 0xAC 0x00 0x00 0xAC Start-Average4 0xAD 0x00 0x00 0xAD Start-Average8 0xAE 0x00 0x00 0xAE Start-Average16 0xAF 0x00 0x00 0xAF Read Sensor Data I2C Read of 7 bytes from device Read of 7 bytes from device SPI Host must send [0xF0], then 6 bytes of [0x00] on MOSI Sensor Returns 7 bytes on MISO Read Sensor Status I2C Read of 1 byte from device. Read of 1 byte from device SPI Host must send [0xF0] on MOSI Sensor Returns 1 byte on MISO DLLR Series High Accuracy Digital Pressure Sensors Table of Contents Page 7 Digital Interface Command Formats The Memory Read Command is used to retrieve the extended Compensation Coefficients from internal memory of the sensor. Values (A, B, C, and D) are 32-bit signed integers, stored in eight 16-bit registers at addresses 47 through 54. Values TC50H and TC50L are stored in high byte and low byte, respectively, of address 55, as signed 8-bit integers. Value E is an 8-bit signed integer, stored at High Byte of address 56. 49 (0x31) [BHW] 50 (0x32) [BLW] 51 (0x33) [CHW] 52 (0x34) [CLW] 53 (0x35) [DHW] 54 (0x36) [DLW] 55 (0x37) [TC50H] [TC50L] 56 (0x38) [E] Each Word is stored in form ([High Byte]:[Low Byte]). To form the complete integers A, B, C, and D, assemble the words in order ([xHW] : [xLW]). For E, the 8-bit high byte represents the complete integer. For TC50H and TC50L, the high byte and low byte, respectively, represent the complete integers. The sequence of commands to retrieve these values is in the form of a Memory Read Request (See Table 3) followed by a Memory Data Read ( See Table 4). Note that the Memory Read Access Time delay must be observed between the request and the read operations. Table 3 - Memory Read Request Command Description Read Request Memory Commands: I2C Write or SPI MOSI: SPI ( 3 bytes ) 0x00 0x00 (Values 47 -56 only ) I2C (1 byte) (Values 47 -56 only ) It must be emphasized that these commands be used accurately and carefully. Errors in forming or transmitting these commands can result in degraded sensor operation. Table 4 - Memory Data Read Operation a 16035 Vineyard Blvd. Morgan Hill, CA 95037 Read Memory Data I2C Read of 3 bytes from device. Read of 3 bytes from device. SPI Host must send [0xF0], then 2 bytes of [0x00] on MOSI. Sensor returns 3 bytes on MISO. Example : I2C Read of Coefficient B : Write , and read back: . Write , and read back: . B = [BHW:BLW], assembling BHW and BLW into a signed 32-bit integer. Example : SPI Read of Coefficient D : Write , Set output buffer to , then perform 3-byte transfer. Input buffer will then contain: < DHW(high byte)> < DHW(low byte)>. Write , Set output buffer to , then perform 3-byte transfer. Input buffer will then contain: < DLW(high byte)> < DLW(low byte)>. D = [DHW:DLW], assembling DHW and DLW into a signed 32-bit integer. All Sensors Table of Contents e www.allsensors.com 48 (0x30) [ALW] f 408 225 2079 47 (0x2F) [AHW] p 408 225 4314 Address Coeff. Word all sensors Table 2 - Coefficient Memory Map DS-0358 Rev A Page 8 Digital Interface Data Format For either type of digital interface, the format of data returned from the sensor is the same. For measurement data, the first byte consists of the Status Byte followed by a 24-bit unsigned pressure value and a 24-bit unsigned temperature value. See the Pressure Output Transfer Function and Temperature Output Transfer Function definitions on page 3 for converting to pressure and temperature. Refer to ‘Extended Compensation Instructions Section’ for improving the accuracy of output pressure values. For memory data output, the status byte is followed by the high byte, then low byte of the memory word. Refer to Table 5 for the overall data format of the sensor. Table 6 shows the Status Byte definition. Note that a completed reading without error will return status 0x40. Table 5 - Measurement Output Data Format S[7:0] Status Byte P[23:16] Pressure Byte 3 P[15:8] Pressure Byte 1 P[7:0] Pressure Byte 0 T[23:16] Temperature Byte 3 T[15:8] Temperature Byte 1 T[7:0] Temperature Byte 0 Table 6 - Memory Data Output Format S[7:0] Status Byte MEM [15:8] MEM High Byte MEM[7:0] MEM Low Byte Table 7- Status Byte Definition Bit Bit 7 [MSB] 6 5 4:3 2 1 Bit 0 [LSB] Description [Always = 0] Power : [1 = Power On] Busy: [ 1 = Processing Command, 0 = Ready] Mode: [00 = Normal Operation ] Memory Error [ 1 = EEPROM Checksum Fail] Sensor Configuration [ always = 0] ALU Error [1 = Error] I2C Interface I2C Command Sequence The part enters Idle state after power-up, and waits for a command from the bus master. Any of the five Measurement commands may be sent, as shown in Table 1. Following receipt of one of these command bytes, the EOC pin is set to Low level, and the sensor Busy bit is set in the Status Byte. After completion of measurement and calculation in the Active state, compensated data is written to the output registers, the EOC pin is set high, and the processing core goes back to Idle state. The host processor can then perform the Data Read operation, which for I2C is simply a 7-byte Device Read. If the EOC pin is not monitored, the host can poll the Status Byte by repeating the Status Read command, which for I2C is a one-byte Device Read. When the Busy bit in the Status byte is zero, this indicate that valid data is ready, and a full Data Read of all 7 bytes may be performed. DO NOT SEND COMMANDS TO SENSOR OTHER THAN THOSE DEFINED IN TABLES 1, 3 & 4. DLLR Series High Accuracy Digital Pressure Sensors Table of Contents Page 9 I2C Interface (Cont’d) I2C Bus Communications Overview The I2C interface uses a set of signal sequences for communication. The following is a description of the supported sequences and their associated mnemonics. Refer to Figure 3 for the associated usage of the following signal sequences. all sensors Bus not Busy (I): During idle periods both data line (SDA) and clock line (SCL) remain HIGH. START condition (ST): A HIGH to LOW transition of SDA line while the clock (SCL) is HIGH is interpreted as START condition. START conditions are always set by the master. Each initial request for a pressure value has to begin with a START condition. Slave address (An): The I2C-bus requires a unique address for each device. The DLLR sensor has a preconfigured slave address (defined by device option, see Table 9). After setting a START condition the master sends the address byte containing the 7 bit sensor address followed by a data direction bit (R/W). A “0” indicates a transmission from master to slave (WRITE), a “1” indicates a device-to master request (READ). e www.allsensors.com Acknowledge (A or N): Data is transferred in units of 8 bits (1 byte) at a time, MSB first. Each data-receiving device, whether master or slave, is required to pull the data line LOW to acknowledge receipt of the data. The Master must generate an extra clock pulse for this purpose. If the receiver does not pull the data line down, a NACK condition exists, and the slave transmitter becomes inactive. The master determines whether to send the last command again or to set the STOP condition, ending the transfer. f 408 225 2079 DATA valid (Dn): State of data line represents valid data when, after a START condition, data line is stable for duration of HIGH period of clock signal. Data on line must be changed during LOW period of clock signal. There is one clock pulse per data bit. STOP condition (P): LOW to HIGH transition of the SDA line while clock (SCL) is HIGH indicates a STOP condition. STOP conditions are always generated by the master. 1. Measurement Commands: Start-Single ( to start reading of single sample): Start-Single C7…C0: 0xAA Start-Average2 C7…C0: 0xAC Start-Average4 C7…C0: 0xAD Start-Average8 C7…C0: 0xAE Start-Average16 C7…C0: 0xAF Set by bus master: Set by sensor: I ST A6 A5 A4 A3 A2 A1 A0 W I ST A6 A5 A4 A3 A2 A1 A0 R I ST A6 A5 A4 A3 A2 A1 A0 R A C7 … C0 N SP I SP I 2. Status Read: Set by bus master: Set by sensor: A S7 … S0 N 3. Data Read: Set by bus master: Set by sensor: Bus states: Idle: Start: Stop: Ack: Nack: “Read” bit (1): “Write” bit (0): I ST SP A N R W Sensor Address: A6 … A0 A S7 … S0 A A P23 … P16 A P15 … P8 A P7 … P0 A T23 … T16 A T15 … T8 N SP T7 … T0 Data bits: Status: Pressure data: Temperature data: S7 … S0 P23 … P0 T23 … T0 Command Bits: C7 … C0 All Sensors DS-0358 Rev A Page 10 Table of Contents I a 16035 Vineyard Blvd. Morgan Hill, CA 95037 p 408 225 4314 Figure 3 - I2C Communication Diagram SPI Interface SPI Command Sequence As with the I2C interface configuration, the part enters Idle state after power-up, and waits for a command from the SPI master. To start a measurement cycle, one of the 3- byte Measurement Commands (see Table 1) must be issued by the master. To start a memory read operation, the memory read request (see Table 3) must be sent. The data returned by the sensor during this command request consists of the Status Byte followed by two undefined data bytes. On successful decode of a measurement command, the EOC pin is set Low as the core goes into Active state for measurement and calculation. When complete, updated sensor data is written to the output registers, and the core goes back to the Idle state. The EOC pin is set to a High level at this point, and the Busy status bit is set to 0. At any point during the Active or Idle periods, the SPI master can request the Status Byte by sending a Status Read command (a single byte with value 0xF0). As with the I2C configuration, a Busy bit of value 0 in the Status Byte or a high level on the EOC pin indicates that a valid data set may be read from the sensor. The Data Read command must be sent from the SPI master (The first byte of value 0xF0 followed by 6 bytes of 0x00). For memory read operations, see Table 4 for reading back the result. NOTE: Sending commands that are not defined in Tables 1, 3, or 4 will corrupt sensor operation. SPI Bus Communications Overview The sequence of bits and bus signals are shown in the following illustration (Figure 4). Refer to Figure 5 in the Interface Timing Diagram section for detailed timing data. Figure 4 - SPI Communications Diagram Measurement or Memory Read Command SCLK --First Command Byte (0xAA / 0xAC / 0xAD / 0xAE / 0xAF) MOSI XXXX C23 C22 C21 MISO HI-Z S7 S6 S5 Lower Command Bytes (0x00 0x00) C20 C19 C18 C17 C16 C 15 S4 S3 S2 S1 S0 XX ----- S7 … S0 (Status) C1 C0 XXXX XX XX HI-Z (Undefined Data) SS --- Read Status Command SCLK Command (0xF0) MOSI Don't Care 1 1 1 MISO S7 S6 S5 Hi-Z 1 0 0 0 0 S4 S3 S2 S1 S0 Don't care Hi-Z S7 … S0 (Status) SS Measurement Data Read Command SCLK --- --- Command (0xF0 then 6 bytes of 0x00) MOSI Don't Care 1 1 1 1 0 0 0 0 MISO Hi-Z S7 S6 S5 S4 S3 S2 S1 S0 S7 … S0 (Status) SS 0 0 P23 P22 --- 0 0 --- P1 P0 0 0 T23 T22 --- 0 0 Don't Care --- T1 T0 Hi-Z P23…P0 (Pressure) T23…T0 (Temperature) --- --- DLLR Series High Accuracy Digital Pressure Sensors Page 11 Table of Contents Interface Timing Diagrams Figure 5 - SPI Timing Diagram tSSCLK tLOW tCLKD tHIGH SCLK MOSI (HI•Z) (HI•Z) all sensors MISO don't care (don't care) tSSSO tDSU tDH SS tSSZ tCLKSS MIN 0.05 120 -8 100 100 50 50 0 -250 TYP - MAX 5 20 32 20 - UNITS MHz ns ns ns ns ns ns ns ns ns ns e www.allsensors.com SYMBOL fSCLK tSSCLK tSSSO tCLKD tLOW tHIGH tDSU tDH tCLKSS tSSZ tIDLE f 408 225 2079 PARAMETER SCLK frequency (1) SS low to first clock edge SS low to serial out Clock to data out SCLK low width SCLK high width Data setup to clock Data hold after clock Last clock to rising SS SS high to output hi-Z Bus idle time tIDLE (1) Maximum by design, tested to 1.0 MHz. tH STA tHIGH p 408 225 4314 Figure 6 - I2C Timing Diagram tLOW SCL tSUS TA PARAMETER SCL frequency SCL low width SCL high width Start condition setup Start condition hold Data setup to clock Data hold to clock Stop condition setup Bus idle time All Sensors tSUDAT SYMBOL fSCL tLOW tHIGH tSUSTA tHSTA tSUDAT tHDAT tSUSTP tIDLE tH DAT MIN 100 1.3 0.6 0.6 0.6 0.1 0 0.6 2.0 tSUS TP TYP - a 16035 Vineyard Blvd. Morgan Hill, CA 95037 SDA tIDLE MAX 400 - UNITS KHz us us us us us us us us DS-0358 Rev A Page 12 Table of Contents Extended Compensation Instructions DLLR Series sensors have internal memory locations containing extended compensation coefficients. For optimal accuracy of pressure readings, system designers can use these values to apply an additional 3rd-order error-correction adjustment to data delivered from the sensor, as well as additional temperature compensation. The four linearity coefficients are obtained for each sensor at the factory by a 3rd order minimization solution to Error = Pref - ( POut + f(POut) ), where Pref is the true pressure applied; POut is the sensor output; f(POut) is a cubic correction function, Ax3+Bx2+Cx+D. For improved accuracy over temperature, residual temperature dependent errors are minimized by the term: TCadj = (1 - (E * 1.25 * | 0.5 - P |)) * (T - Tref) * TC50 where: TC50 = TC50H for T > Tref TC50 = TC50L for T ≤ Tref On system startup: Read the seven coefficients (A, B, C, D, E, TC50H, & TC50L) from sensor EEPROM, using the command sequence described in the datasheet section ‘Digital Interface Command Formats’. A, B, C & D are 32-bit signed integers, representing a scaled magnitude from -1.0 to +1.0. E, TC50H, & TC50L are 8-bit signed integers, representing a scaled magnitude from -1.0 to +1.0. Example: // I2C Input, output buffers: unsigned char inbuf[32] = {0}, outbuf[32] = {0}; // ----- DLLR Coefficients -----float DLLR_A = 0.0, DLLR_B = 0.0, DLLR_C = 0.0, DLLR_D = 0.0; float DLLR_E = 0.0, TC50H = 0.0, TCH50L = 0.0; int32_t i32A = 0, i32B =0, i32C =0, i32D=0, int8_t i8E = 0, i8TC50H = 0, i8TC50L = 0; After sensor power-on: outbuf[0] = 47; // Address of A high word success = DUT_I2C_Write(ui8Address, outbuf, 1); // 1-byte request Wait_ms(20); // EEPROM access time : returns [Status][MSB][LSB] success = DUT_I2C_Read(ui8Address, inbuf, 3); // EEPROM result i32A = (inbuf[1]