MPL115A2 FREESCALE | Alldatasheet
Document overview
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- PDF pages: 8
Technical content
Features
- Digitized pressure and temperature information together with programmed calibration coefficients for host micro use.
- Factory Calibrated
- 50 kPa to 115 kPa Absolute Pressure
- 1 kPa Accuracy
- 2.375 V to 5.5 V Supply
- Integrated ADC 2C Interface
- Monotonic Pressure and Temperature Data Outputs
- Surface Mount RoHS Compliant Package
ORDERING INFORMATION
Device Name Package Options Case No. # of Ports Pressure Type Digital InterfaceNone Single Dual Gauge Differential Absolute MPL115A2T1 Tape & Reel 2015 • • I2C Pin Description PIN NAME FUNCTION 1 VDD VDD Power Supply Connection.
2 CAP External Capacitor
3 GND Ground
4 SHDN Shutdown (Sleep): Connect to GND to disable the device.
5 RST Reset: Drive line low to disable I
2C communications. 6 NC NC: No connection. 7S D A (1) SDA: Serial data I/O line. 8S C L (1) I2C Serial Clock Input. 1. Use 4.7k pull-up resistors for I2C communication. MPL115A2 50 to 115 kPa MPL115A2 5.0 mm X 3.0 mm X 1.2 mm MAX LGA PACKAGE NC SDA VDD CAP SHDN GND RST SCL PIN CONNECTIONS Application Examples
- Barometry (portable and desk-top)
- Altimeters
- Weather Stations
- Hard Disk-Drives (HDD)
- Industrial Equipment
- Health Monitoring
- Air Control Systems
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Voltage (with respect to GND unless otherwise noted) Operating Characteristics Ref Parameters Symbol Conditions Min Typ Max Units 1 Operating Supply Voltage VDD 2.375 3.3 5.5 V
2 Supply Current IDD Shutdown (SHDN = GND) — — 1 μA
Standby — 3.5 10 μA Average – at one measurement per second — 5 6 μA Pressure Sensor
3 Range 50 — 115 kPa
4 Resolution —0 . 1 5 —k P a
5 Accuracy -20ºC to 85ºC — ±1 — kPa
6 Power Supply Rejection Typical operating circuit at DC — 0.1 — kPa/V 100 mV p-p 217 Hz square wave plus 100 mV pseudo random noise with 10 MHz bandwidth. —0 . 1 — k P a
7 Conversion Time
(Start Pressure Convert) tcp Time between start convert command and data available in the Pressure register —0 . 6 0 . 7 m s Temperature Sensor
8 Range -40 — 105 ºC
9 Conversion Time
(Start Temperature Convert) tct Time between start convert command and data available in the Temperature register —0 . 6 0 . 7 m s
10 Conversion Time
(Start Both Convert) tcb Time between start convert command and data available in the Pressure and Temperature registers —0 . 8 1 m s 11 Resolution Temperature ADC is 472 counts at 25ºC — -5.35 — counts/ºC I2C I/O Stages: SCL, SDA
12 SCL Clock Frequency f SCL — — 400 KHz
13 Low Level Input Voltage VIL — — 0.3V DD V 14 High Level Input Voltage VIH 0.7V DD —— V I2C Outputs: SDA
15 Data Setup Time t SU Setup time from command receipt to ready to
100 — — ns I2C Addressing MPL115A2 uses 7-bit addressing, does not acknowledge the general call address 0000000. Slave address has been set to 0x60 or 1100000.
Figure 1. Block Diagram The pressure compensation for MPL115A2 is based on a 2-dimensional, second order polynomial. c22 is the 2nd order temperature offset coefficient.
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Coefficient Bit-Width Specs The table below specifies the initial coefficient bit-width specs for the compensation algorithm. * Factory reserves the option to make these values = 0. Example Binary Format Definitions: 1. Sign = 0, Integer Bits = 8, Fr actional Bits = 4 : Coeff = S I 7 I6 I5 I4 I3 I2 I1 I0 . F3 F2 F1 F0 2. Sign = 1, Integer Bits = 4, Fr actional Bits = 7 : Coeff = S I 3 I2 I1 I0 . F6 F5 F4 F3 F2 F1 F0 3. Sign = 0, Integer Bits = 0, Fractional Bits = 6, dec pt zero pad = 2 : Coeff = S 0 . 0 0 F 5 F4 F3 F2 F1 F0 4. Sign = 0, Integer Bits = 0, Fractional Bits = 5, dec pt zero pad = 3 : Coeff = S 0 . 0 0 0 F4 F3 F2 F1 F0 NOTE: Negative coefficients (Sign = 1) are coded in 2’s complement notation. Coefficient Address Map For coefficients with less than 16 bits, the lower lsbs are zero. For example, c11 is 11 bits and is stored into 2 bytes as follows: c11 MS byte = c11[10:3] = [c11b10 , c11b9 , c11b8 , c11b7 , c11b6 , c11b5 , c11b4 , c11b3] c11 LS byte = c11[2:0] & “00000” = [c11b2 , c11b1 , c11b0 , 0 , 0 , 0 , 0 , 0] 10-bit Output: Compensation Coefficient Specs Total Coeff. Bitsa0 b1 b2 c12 c11* c22* Total Bits 16 16 16 14 11 11 84 Sign Bits 1 1 1 1 1 1 Integer Bits 12 2 1 0 0 0 Fractional Bits 4 13 14 13 11 10 dec pt zero pad — — — 9 11 15 Address Coefficient $04 a0 MS Byte $05 a0 LS Byte $06 b1 MS Byte $07 b1 LS Byte $08 b2 MS Byte $09 b2 LS Byte $0A c12 MS Byte $0B c12 LS Byte $0C c11 MS Byte $0D c11 LS Byte $0E c22 MS Byte $0F c22 LS Byte
- Use SAC solder alloy (i.e., Sn-Ag-Cu) with a melting point of about 217 °C. It is recommended to use SAC305 2. Reflow
- Ramp up rate: 2 to 3 C/s.
- Preheat flat (soak): 110 to 130s.
- Reflow peak temperature: 250 °C to 260°C (depends on exact SAC alloy composition).
- Time above 217°C: 40 to 90s (depends on board type, thermal mass of the board/quantities in the reflow).
- Ramp down: 5 to 6 C/s.
- Using an inert reflow environment (with O2 level about 5 to 15 ppm). NOTE: The stress level and signal offset of the device also depends on the board type, board core material, board thickness and metal finishing of the board. Handling Recommendations It is recommended to handle the MPL115A Pressure Sensor with a vacuum pick and place tool. Sharp objects utilized to move the MPL115A Pressure Sensor increase the possibility of damage via a foreign object/tool into the small exposed port. The sensor die is sensitive to light exposure. Direct light exposure through the port hole can lead to varied accuracy of pressure measurement. Avoid such exposure to the port during normal operation.
6 Freescale Semiconductor
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