Freescale MPL015A2 Barometry (portable and desk-top) weather stations industrial equipment Datasheet

Pressure
Freescale Semiconductor
MPL015A2
Rev 1, 12/2010
Miniature I2C Digital Barometer
The MPL015A2 is an absolute pressure sensor with digital output for low cost
applications. A miniature 5 x 3 x 1.2 mm LGA package ideally suits it for portable
electronics and space constrained applications. Low current consumptions of
5 μA during Active mode and 0.06 μA during Shutdown (Sleep) mode target
battery and other low-power applications. A wide operating temperature range
from -40°C to +105°C fits demanding environmental requirements.
MPL015A2 employs a MEMS pressure sensor with a conditioning IC to provide
accurate pressure measurement from 50 to 115 kPa. An integrated ADC provides
digitized temperature and pressure sensor outputs via an I2C port. Calibration
Data is stored in internal ROM. Utilizing raw sensor output, the host
microcontroller executes a compensation algorithm to render Compensated
Absolute Pressure.
The MPL015A2 pressure sensor’s small form factor, low power capability,
precision, and digital output optimize it for barometric measurement applications.
Features
MPL015A2
50 to 115 kPa
Application Examples
•
•
•
•
•
•
•
Barometry (portable and desk-top)
Altimeters
Weather Stations
Hard Disk-Drives (HDD)
Industrial Equipment
Health Monitoring
Air Control Systems
• 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
• I2C Interface
• Monotonic Pressure and Temperature Data Outputs
• Surface Mount RoHS Compliant Package
ORDERING INFORMATION
Device Name
MPL015A2T1
Package Options
Case No.
Tape & Reel
2015
# of Ports
None
Single
Pressure Type
Dual
Gauge
Differential
•
Absolute
Digital
Interface
•
I2 C
LGA PACKAGE
Pin Description
MPL015A2
5.0 mm X 3.0 mm X 1.2 mm MAX
VDD
CAP
1
2
8
7
SCL
SDA
GND
3
6
NC
SHDN
4
5
RST
PIN
NAME
1
VDD
VDD Power Supply Connection.
FUNCTION
2
CAP
External Capacitor
3
GND
Ground
4
SHDN
5
RST
Reset: Drive line low to disable I2C communications.
6
NC
NC: No connection.
7
SDA(1)
SDA: Serial data I/O line.
8
SCL(1)
I2C Serial Clock Input.
Shutdown (Sleep): Connect to GND to disable the device.
1. Use 4.7k pull-up resistors for I2C communication.
PIN CONNECTIONS
© Freescale Semiconductor, Inc., 2010. All rights reserved.
Pressure
Maximum Ratings
Voltage (with respect to GND unless otherwise noted)
VDD .............................................................................................................................. -0.3 V to +5.5 V
SCLK, CS, DIN, DOUT ................................................................................................. -0.3 V to VDD+0.3 V
Operating Temperature Range .................................................................................... -40°C to +105°C
Storage Temperature Range........................................................................................ -40°C to +125°C
Overpressure ............................................................................................................... 1000 kPa
Operating Characteristics
(VDD = 2.375 V to 5.5 V, TA = -40°C to +105°C, unless otherwise noted. Typical values are at V+ = 3.3 V, TA = +25°C.
Ref
Parameters
Symbol
1
Operating Supply Voltage
VDD
2
Supply Current
IDD
Conditions
Min
Typ
Max
Units
2.375
3.3
5.5
V
Shutdown (SHDN = GND) @ 25ºC
—
0.06
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
—
0.15
—
kPa
5
Accuracy
—
±1
—
kPa
6
Accuracy Change over
Temperature
—
±0.125
—
kPa/ºC
7
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
—
kPa
Time between start convert command and data
available in the Pressure register
—
0.6
0.7
ms
-40
—
105
ºC
8
Conversion Time
(Start Pressure Convert)
@ 25ºC
tcp
Temperature Sensor
9
Range
10
Conversion Time
(Start Temperature Convert)
tct
Time between start convert command and data
available in the Temperature register
—
0.6
0.7
ms
11
Conversion Time
(Start Both Convert)
tcb
Time between start convert command and data
available in the Pressure and Temperature
registers
—
0.8
1
ms
12
Resolution
Temperature ADC is 472 counts @ 25ºC
—
-5.35
—
counts/ºC
I2C I/O Stages: SCL, SDA
13
SCL Clock Frequency
fSCL
—
—
400
KHz
14
Low Level Input Voltage
VIL
—
—
0.3VDD
V
15
High Level Input Voltage
VIH
0.7VDD
—
—
V
100
—
—
ns
I2C Outputs: SDA
16
Data Setup Time
tSU
Setup time from command receipt to ready to
transmit
I2C Addressing
MPL015A2 uses 7-bit addressing, does not acknowledge the general call address 0000000. Slave address has been set to 0x60 or 1100000.
MPL015A2
2
Sensors
Freescale Semiconductor
Pressure
1 μF
VDD
VDD
ADDR
Coefficient
Storage
CAP
CAP
ADDR
1 μF
ADDR
MUX
Diff
Amp
ADC
ADDR
Pressure
ADDR
Temperature
Temp
Sensor
SHDN
SHDN
4.7 k
I 2C
Interface
SCL
SCL
SDA
SDA
RST
RST
μC
4.7 k
Microcontroller
GND
GND
Figure 1. Block Diagram
Compensation
The 10-bit compensated pressure output, Pcomp, is calculated as follows:
Pcomp = a0 + (b1 + Padc + c12*Tadc) * Padc + (b2 + Tadc) * Tadc
Where:
Padc is the 10-bit pressure output of the MPL015A2 ADC,
Tadc is the 10-bit temperature output of the MPL015A2 ADC,
a0 is the pressure offset coefficient,
b1 is the pressure sensitivity coefficient,
c12 is the coefficient for temperature sensitivity coefficient (TCS),
b2 is the 1st order temperature offset coefficient (TCO),
Ideally, Pcomp will produce a value of 0 with an input pressure of 50 kPa and will produce a full-scale value of 1023 with an input
pressure of 115 kPa.
MPL015A2
Sensors
Freescale Semiconductor
3
Pressure
Coefficient Bit-Width Specs
The table below specifies the initial coefficient bit-width specs for the compensation algorithm.
10-bit Output: Compensation Coefficient Specs
Total Coeff.
Bits
a0
b1
b2
c12
Total Bits
16
16
16
14
Sign Bits
1
1
1
1
Integer Bits
12
2
1
0
Fractional Bits
4
13
14
13
dec pt zero pad
—
—
—
9
62
* Factory reserves the option to make these values = 0.
Example Binary Format Definitions:
1.
Sign = 0, Integer Bits = 8, Fractional Bits = 4 :
Coeff = S I7 I6 I5 I4 I3 I2 I1 I0 . F3 F2 F1 F0
2.
Sign = 1, Integer Bits = 4, Fractional Bits = 7 :
Coeff = S I3 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 F5 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
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
For coefficients with less than 16 bits, the lower LSBs are zero. For example, c14 is 14 bits and is stored into 2 bytes as follows:
c14 MS byte = c14[10:3] = [c14b13 , c14b12 , c14b11 , c14b10 , c14b9 , c14b8 , c14b7 , c14b6]
c14 LS byte = c14[2:0] & “00000” = [c14b5 , c14b4 , c14b3 , c14b2 , c14b1 , c14b0 , 0 , 0]
MPL015A2
4
Sensors
Freescale Semiconductor
Pressure
Solder Recommendations
1.
Use SAC solder alloy (i.e., Sn-Ag-Cu) with a melting point of about 217°C. It is recommended to use SAC305
(i.e., Sn-3.0 wt.% Ag-0.5 wt.% Cu).
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 MPL015A2 pressure sensor with a vacuum pick and place tool. Sharp objects utilized to move
the MPL015A2 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.
MPL015A2
Sensors
Freescale Semiconductor
5
Pressure
PACKAGE DIMENSIONS
CASE 2015-02
ISSUE A
LGA PACKAGE
MPL015A2
6
Sensors
Freescale Semiconductor
Pressure
PACKAGE DIMENSIONS
CASE 2015-02
ISSUE A
LGA PACKAGE
MPL015A2
Sensors
Freescale Semiconductor
7
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© Freescale Semiconductor, Inc. 2010. All rights reserved.
MPL015A2
Rev. 1
12/2010
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