MPL115A2 Datasheet PDF - Freescale Semiconductor


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MPL115A2
Freescale Semiconductor

Part Number MPL115A2
Description Miniature I2C Digital Barometer
Page 16 Pages

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Freescale Semiconductor
Data Sheet: Technical Data
Document Number: MPL115A2
Rev. 9, 02/2013
Miniature I2C Digital Barometer
The MPL115A2 is an absolute pressure sensor with a digital I2C output targeting
low cost applications. A miniature 5 x 3 x 1.2 mm LGA package is ideally suited
for the space constrained requirements of portable electronic devices. Low
current consumptions of 5 μA during Active mode and 1 μA during Shutdown
(Sleep) mode are essential when focusing on low-power applications. The wide
operating temperature range spans from -40°C to +105°C to fit demanding
environmental conditions.
The MPL115A2 employs a MEMS pressure sensor with a conditioning IC to
provide accurate pressure measurements from 50 to 115 kPa. An integrated
ADC converts pressure and temperature sensor readings to digitized outputs via
a I2C port. Factory calibration data is stored internally in an on-board ROM.
Utilizing the raw sensor output and calibration data, the host microcontroller
executes a compensation algorithm to render Compensated Absolute Pressure
with ±1 kPa accuracy.
The MPL115A2 pressure sensor’s small form factor, low power capability,
precision, and digital output optimize it for barometric measurement
applications.
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
• 2.375V to 5.5V supply
• Integrated ADC
• I2C Interface (operates up to 400 kHz)
• 7-bit I2C address = 0x60
• Monotonic pressure and temperature data outputs
• Surface mount RoHS compliant package
Application Examples
• Barometry (portable and desktop)
• Altimeters
• Weather stations
• Hard-disk drives (HDD)
• Industrial equipment
• Health monitoring
• Air control systems
MPL115A2
50 to 115 kPa
MPL115A2
5.0 mm x 3.0 mm x 1.2 mm
Top View
VDD 1
CAP 2
GND 3
SHDN 4
8 SCL
7 SDA
6 NC
5 RST
Pin Connections
Device Name
MPL115A2
MPL115A2T1
Package Options
Tray
Tape & Reel (1000)
ORDERING INFORMATION
# of Ports
Case No.
None Single Dual
2015
2015
Pressure Type
Gauge Differential Absolute
Digital
Interface
I2C
I2C
© 2009-2013 Freescale Semiconductor, Inc. All rights reserved.



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1 Block Diagram and Pin Descriptions
Diff
Amp
Temp
Sensor
Coefficient
Storage
ADDR
ADDR
ADDR
ADC
ADDR Pressure
ADDR Temperature
I2C
Interface
VDD
VDD
1 μF
CAP
CAP
1 μF
SSHHDDNN
SCL
SCL
SDA
SDA
RST
RST
4.7 k
4.7 k
GND
GND
μC
Microcontroller
Table 1. Pin Description
Figure 1. Block Diagram and Pin Connections
Pin Name
Function
1
VDD
VDD Power Supply Connection: VDD range is 2.375V to 5.5V.
2
CAP
1 μF connected to ground.
3
GND
Ground
Shutdown: Connect to GND to disable the device. When in shutdown, the part draws no more than 1 μA supply
4
SHDN
current and all communications pins (RST, SCL, SDA) are high impedance. Connect to VDD for normal
operation.
5
RST
Reset: Connect to ground 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.
1. Use 4.7k pullup resistors for I2C communication.
MPL115A2
2
Sensors
Freescale Semiconductor, Inc.



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2 Mechanical and Electrical Specifications
2.1 Maximum Ratings
Voltage (with respect to GND unless otherwise noted)
VDD ..................................................................................................................... -0.3 V to +5.5 V
SHDN, RST, SDA, SCL ...............................................................................-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
2.2 Operating Characteristics
VDD = 2.375 V to 5.5 V, TA = -40°C to +105°C, unless otherwise noted. Typical values are at VDD = 3.3 V, TA = +25°C.
Ref
Parameters
Symbol
Conditions
Min Typ
Max
Units
1 Operating Supply Voltage
2 Supply Current
VDD
IDD Shutdown (SHDN = GND)
Standby
2.375 3.3 5.5
— —1
— 3.5 10
V
μA
μA
Average – at one measurement per second
56
μA
Pressure Sensor
3 Range
50
— 115
kPa
4 Resolution
— 0.15 — kPa
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 —
kPa
7 Conversion Time
(Start Pressure and Temperature
Conversion)
tc Time between start convert command and
data available in the Pressure and
Temperature registers
— 1.6 3
ms
8 Wakeup Time
tw Time between leaving Shutdown mode
(SHDN goes high) and communicating with
the device to issue a command or read data.
35
ms
I2C I/O Stages: SCL, SDA
9 SCL Clock Frequency
10 Low Level Input Voltage
11 High Level Input Voltage
I2C Outputs: SDA
fSCL
VIL
VIH
0.7VDD
— 400
— 0.3VDD
——
kHz
V
V
12 Data Setup Time
tSU Setup time from command receipt to ready to
transmit
0
— 0.4
s
I2C Addressing
MPL115A2 uses 7-bit addressing, does not acknowledge the general call address 0000000. Slave address has been set to 0x60 or 1100000.
Sensors
Freescale Semiconductor, Inc.
MPL115A2
3



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3 Overview of Functions/Operation
Initial
powerup
Reading
coefficient data
Data conversion
Compensated
pressure reading
Shutdown
Figure 2. Sequence Flow Chart
The MPL115A interfaces to a host (or system) microcontroller in the user’s application. All communications are via I2C. A typical
usage sequence is as follows:
Initial Power-up
All circuit elements are active. I2C port pins are high impedance and associated registers are cleared. The device then enters
standby mode.
Reading Coefficient Data
The user then typically accesses the part and reads the coefficient data. The main circuits within the slave device are disabled
during read activity. The coefficients are usually stored in the host microcontoller local memory but can be re-read at any time.
It is not necessary to read the values stored in the host microcontroller multiple times because the coefficients within a device
are constant and do not change. However, note that the coefficients will be different from device to device, and cannot be used
for another part.
Data Conversion
This is the first step that is performed each time a new pressure reading is required which is initiated by the host sending the
CONVERT command. The main system circuits are activated (wake) in response to the command and after the conversion
completes, the result is placed into the Pressure and Temperature ADC output registers.
The conversion completes within the maximum conversion time, tc (see Row 7, in the Operating Characteristics Table). The
device then enters standby mode.
Compensated Pressure Reading
After the conversion has been given sufficient time to complete, the host microcontroller reads the result from the ADC output
registers and calculates the Compensated Pressure, a barometric/atmospheric pressure value which is compensated for
changes in temperature and pressure sensor linearity. This is done using the coefficient data from the MPL115A and the raw
sampled pressure and temperature ADC output values, in a compensation equation (detailed later). Note that this is an absolute
pressure measurement with a vacuum as a reference.
From this step the host controller may either wait and then return to the Data Conversion step to obtain the next pressure reading
or it may go to the Shutdown step.
MPL115A2
4
Sensors
Freescale Semiconductor, Inc.




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