MS563702BA03-50 [TE]
Low Voltage Barometric Pressure Sensor;
| 型号： | MS563702BA03-50 |
| 厂家： | 
TE CONNECTIVITY |
| 描述： | Low Voltage Barometric Pressure Sensor 传感器 换能器 |
| 文件： | 总18页 (文件大小：476K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SPECIFICATIONS
QFN package 3 x 3 x 0.9 mm3
High-resolution module, 13 cm
Supply voltage: 1.5 to 3.6 V
Fast conversion down to 0.5 ms
Low power, 0.6 µA (standby ≤ 0.1 µA at 25°C)
Integrated digital pressure sensor (24 bit ΔΣ ADC)
Operating range: 300 to 1200 mbar, -40 to +85 °C
I2C interface
No external components (internal oscillator)
The MS5637 is an ultra-compact micro altimeter. It is optimized
for altimeter and barometer applications in Smart-phones and
Tablet PCs. The altitude resolution at sea level is 13 cm of air. The
sensor module includes a high-linearity pressure sensor and an
ultra-low power 24 bit ΔΣ ADC with internal factory-calibrated
coefficients. It provides a precise digital 24-bit pressure and
temperature value and different operation modes that allow the
user to optimize for conversion speed and current consumption. A
high-resolution temperature output allows the implementation of
an altimeter/thermometer function without any additional sensor.
The MS5637 can be interfaced to any microcontroller with I2C-bus
interface. The communication protocol is simple, without the need
of programming internal registers in the device. Small dimensions
of 3 x 3 x 0.9 mm3 allow the integration in mobile devices. This
new sensor module generation is based on leading MEMS
technology and latest benefits from MEAS Switzerland proven
experience and know-how in high volume manufacturing of
altimeter modules, which has been widely used for over a decade.
The sensing principle employed leads to very low hysteresis and
high stability of both pressure and temperature signal.
SENSOR SOLUTIONS ///MS5637-02BA03
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
FEATURES
FIELD OF APPLICATION
Smart-phones
Tablet PCs
Personal navigation devices
TECHNICAL DATA
Sensor Performances (VDD = 3 V)
Pressure
Maximum Range
ADC
Min
Typ
Max
Unit
mbar
bit
10
2000
24
0.11 / 0.062/ 0.039
/ 0.028 / 0.021 /
0.016
Resolution (1)
mbar
Error band at 25°C,
300 to 1200 mbar
Error band, -20°C to + 85°C,
300 to 1200 mbar (2)
-2
-4
+2
+4
mbar
mbar
ms
0.5 / 1.1 / 2.1 / 4.1 /
8.22 / 16.44
Response time (1)
Long term stability
1
mbar/yr
Temperature
Min
Typ
Max
Unit
Range
-40
+85
°C
°C
°C
Resolution
Accuracy at 25°C
<0.01
-1
+1
Notes: (1) Oversampling Ratio: 256 / 512 / 1024 / 2048 / 4096 / 8192
(2) With auto-zero at one pressure point
FUNCTIONAL BLOCK DIAGRAM
VDD
I2C Bus
Interface
+IN
-IN
SENSOR
SDA
SCL
dig.
Filter
ADC
Memory
(PROM)
112 bits
Sensor
Interface IC
SGND
GND
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
PERFORMANCE SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Conditions
Min.
-0.3
-20
Typ.
Max.
+3.6
+85
Unit
V
Supply voltage
Storage temperature
Overpressure
VDD
TS
°C
Pmax
6
bar
Maximum Soldering
Temperature
Tmax
40 sec max
250
+2
°C
Human Body
Model
ESD rating
Latch up
-2
kV
mA
JEDEC standard
No 78
-100
+100
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
VDD
Conditions
Min.
1.5
Typ.
3.0
Max.
3.6
Unit
V
Operating Supply voltage
Operating Temperature
T
-40
+25
+85
°C
OSR
8192
20.09
10.05
5.02
2.51
1.26
0.63
4096
2048
1024
512
Supply current
IDD
µA
(1 sample per sec.)
256
Peak supply current
Standby supply current
VDD Capacitor
during conversion
at 25°C (VDD = 3.0 V)
from VDD to GND
1.25
0.01
470
mA
µA
nF
0.1
100
ANALOG DIGITAL CONVERTER (ADC)
Parameter
Symbol Conditions
Min.
Typ.
Max.
Unit
Output Word
24
bit
OSR
8192
4096
2048
1024
512
16.44
8.22
4.13
2.08
1.06
0.54
Conversion time
tc
ms
256
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
PERFORMANCE SPECIFICATIONS (CONTINUED)
PRESSURE OUTPUT CHARACTERISTICS (VDD = 3.0 V, T = 25 °C UNLESS OTHERWISE NOTED)
Parameter
Conditions
Min.
Typ.
Max.
Unit
Operating Pressure Range
Prange
300
1200
mbar
Linear Range of
ADC
Extended Pressure Range
Pext
10
2000
mbar
Relative Accuracy, autozero at
one pressure point (1)
700…1000 mbar at 25°C
0.1
mbar
Absolute Accuracy,
no autozero
300..1200 mbar at 25°C
300..1200mbar, -20..85°C
-2
-4
+2
+4
mbar
mbar
OSR
8192
0.016
0.021
0.028
0.039
0.062
0.11
4096
2048
1024
512
Resolution RMS
256
Maximum error with supply
voltage
VDD = 1.5 V … 3.6 V
0.5
1
mbar
Long-term stability
mbar/yr
IPC/JEDEC J-STD-020C
Reflow soldering impact
-1
3
mbar
days
(See application note AN808
on http://meas-spec.com)
Recovering time after reflow (2)
(1) Characterized value performed on qualification devices
(2) Recovering time at least 66% of the reflow impact
TEMPERATURE OUTPUT CHARACTERISTICS (VDD = 3 V, T = 25°C UNLESS OTHERWISE NOTED)
Parameter
Conditions
at 25°C
Min.
-1
Typ.
Max.
+1
Unit
Absolute Accuracy
°C
-20..85°C
-2
+2
Maximum error with supply
voltage
VDD = 1.5 V … 3.6 V
0.3
°C
°C
OSR
8192
4096
2048
1024
512
0.002
0.003
0.004
0.006
0.009
0.012
Resolution RMS
256
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
PERFORMANCE SPECIFICATIONS (CONTINUED)
DIGITAL INPUTS (SDA, SCL)
Parameter
Symbol Conditions
Min.
Typ.
Max.
400
Unit
kHz
V
Serial data clock
Input high voltage
Input low voltage
Input leakage current
Input capacitance
SCL
VIH
80% VDD
0% VDD
100% VDD
20% VDD
0.1
VIL
V
Ileak
CIN
T = 25 °C
µA
pF
6
DIGITAL OUTPUTS (SDA)
Parameter
Symbol Conditions
Min.
Typ.
Max.
Unit
V
Output high voltage
Output low voltage
Load capacitance
VOH
Isource = 1 mA
Isink = 1 mA
80% VDD
0% VDD
100% VDD
20% VDD
VOL
V
CLOAD
16
pF
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
FUNCTIONAL DESCRIPTION
VDD
I2C Bus
Interface
+IN
-IN
SENSOR
SDA
SCL
dig.
Filter
ADC
Memory
(PROM)
112 bits
Sensor
Interface IC
SGND
GND
Figure 1: Block diagram
GENERAL
The MS5637 consists of a piezo-resistive sensor and a sensor interface integrated circuit. The main function of the
MS5637 is to convert the uncompensated analogue output voltage from the piezo-resistive pressure sensor to a
24-bit digital value, as well as providing a 24-bit digital value for the temperature of the sensor.
FACTORY CALIBRATION
Every module is individually factory calibrated at two temperatures and two pressures. As a result, 6 coefficients
necessary to compensate for process variations and temperature variations are calculated and stored in the 112-
bit PROM of each module. These bits (partitioned into 6 coefficients) must be read by the microcontroller software
and used in the program converting D1 and D2 into compensated pressure and temperature values.
SERIAL I2C INTERFACE
The external microcontroller clocks in the data through the input SCL (Serial CLock) and SDA (Serial DAta). The
sensor responds on the same pin SDA which is bidirectional for the I2C bus interface. So this interface type uses
only 2 signal lines and does not require a chip select.
Module reference
MS563702BA03
Mode
I2C
Pins used
SDA, SCL
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Low Voltage Barometric Pressure Sensor
PRESSURE AND TEMPERATURE CALCULATION
Start
Maximum values for calculation results:
PMIN = 10mbar PMAX = 2000mbar
TMIN = -40°C TMAX = 85°C TREF = 20°C
Read calibration data (factory calibrated) from PROM
Size [1]
[bit]
Value
Recommended
variable type
Example /
Typical
Variable Description | Equation
min
0
max
Pressure sensitivity | SENST1
C1
C2
C3
C4
C5
C6
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
unsigned int 16
16
16
16
16
16
16
65535
65535
65535
65535
65535
65535
46372
43981
29059
27842
31553
28165
Pressure offset | OFFT1
0
Temperature coefficient of pressure sensitivity | TCS
Temperature coefficient of pressure offset | TCO
Reference temperature | TREF
0
0
0
Temperature coefficient of the temperature | TEMPSENS
0
Read digital pressure and temperature data
D1
D2
Digital pressure value
unsigned int 32
unsigned int 32
24
24
0
0
16777216
16777216
6465444
8077636
Digital temperature value
Calculate temperature
[2]
Difference between actual and reference temperature
dT = D2 - TREF = D2 - C5 * 2 8
dT
signed int 32
25
41
-16776960
-4000
16777216
8500
68
2000
Actual temperature (-40…85°C with 0.01°C resolution)
TEMP =20°C+dT*TEMPSENS=2000+dT *C6 /223
TEMP
signed int 32
= 20.00 °C
Calculate temperature compensated pressure
Offset at actual temperature [3]
OFF
signed int 64
signed int 64
41
41
-17179344900
-8589672450
25769410560
12884705280
5764707214
3039050829
OFF =OFFT1 +TCO*dT =C2 *217 +(C4*dT )/26
Sensitivity at actual temperature [4]
SENS =SENST1 +TCS*dT=C1 * 2 16 +(C3 *dT )/27
SENS
Temperature compensated pressure (10…1200mbar with
110002
0.01mbar resolution)
P = D1 * SENS - OFF = (D1 * SENS / 2 21 - OFF) / 2 15
P
signed int 32
58
1000
120000
= 1100.02 mbar
Display pressure and temperature value
Notes
[1]
Maximal size of intermediate result during evaluation of variable
min and max have to be defined
min and max have to be defined
min and max have to be defined
[2]
[3]
[4]
Figure 2: Flow chart for pressure and temperature reading and software compensation.
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SECOND ORDER TEMPERATURE COMPENSATION
In order to obtain best accuracy over temperature range, particularly at low temperature, it is recommended to
compensate the non-linearity over the temperature. This can be achieved by correcting the calculated temperature,
offset and sensitivity by a second-order correction factor. The second-order factors are calculated as follows:
Figure 3: Flow chart for pressure and temperature to the optimum accuracy.
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Low Voltage Barometric Pressure Sensor
I2C INTERFACE
COMMANDS
The MS5637 has only five basic commands:
1. Reset
2. Read PROM (112 bit of calibration words)
3. D1 conversion
4. D2 conversion
5. Read ADC result (24 bit pressure / temperature)
Each I2C communication message starts with the start condition and it is ended with the stop condition. The MS5637
address is 1110110x (write : x=0, read : x=1).
Size of each command is 1 byte (8 bits) as described in the table below. After ADC read commands, the device will
return 24 bit result and after the PROM read 16 bit results. The address of the PROM is embedded inside of the
PROM read command using the a2, a1 and a0 bits.
Command byte
hex value
Bit number
Bit name
0
1
2
-
3
4
5
6
7
PRO CO
M
Typ Ad2/ Ad1/ Ad0/ Stop
Os2 Os1 Os0
NV
Command
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
1
0
0
0
0
1
1
0
0
0
0
1
1
0
1
0
0
1
1
0
0
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x1E
0x40
0x42
0x44
0x46
0x48
0x4A
0x50
0x52
0x54
0x56
0x58
0x5A
0x00
Convert D1 (OSR=256)
Convert D1 (OSR=512)
Convert D1 (OSR=1024)
Convert D1 (OSR=2048)
Convert D1 (OSR=4096)
Convert D1 (OSR=8192)
Convert D2 (OSR=256)
Convert D2 (OSR=512)
Convert D2 (OSR=1024)
Convert D2 (OSR=2048)
Convert D2 (OSR=4096)
Convert D2 (OSR=8192)
ADC Read
PROM Read
Ad2 Ad1 Ad0
0xA0 to
0xAE
Figure 4: Command structure
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Low Voltage Barometric Pressure Sensor
RESET SEQUENCE
The Reset sequence shall be sent once after power-on to make sure that the calibration PROM gets loaded into
the internal register. It can be also used to reset the device PROM from an unknown condition.
The reset can be sent at any time. In the event that there is not a successful power on reset this may be caused by
the SDA being blocked by the module in the acknowledge state. The only way to get the MS5637 to function is to
send several SCLs followed by a reset sequence or to repeat power on reset.
1
1
1
0
1
1
0
0
0
A
0
0
0
1
1
1
1
0
0
A
Device Address
Device Address
command
cmd byte
S
W
P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledge
Figure 5: I2C Reset Command
PROM READ SEQUENCE
The read command for PROM shall be executed once after reset by the user to read the content of the calibration
PROM and to calculate the calibration coefficients. There are in total 7 addresses resulting in a total memory of 112
bit. Addresses contains factory data and the setup, calibration coefficients, the serial code and CRC. The command
sequence is 8 bits long with a 16 bit result which is clocked with the MSB first. The PROM Read command consists
of two parts. First command sets up the system into PROM read mode. The second part gets the data from the
system.
1
1
1
0
1
1
0
0
0
A
1
0
1
0
0
1
1
0
0
A
Device Address
Device Address
command
cmd byte
S
W
P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledge
Figure 6: I2C Command to read memory address= 011
1
1
1
0
1
1
0
1
0
A
X
X
X
X
X
X
X
X
0
A
X
X
X
X
X
X
X
X
0
Device Address
Device Address
data
Memory bit 15 - 8
data
Memory bit 7 - 0
S
R
N P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledage
Figure 7: I2C answer from MS5637
CONVERSION SEQUENCE
The conversion command is used to initiate uncompensated pressure (D1) or uncompensated temperature (D2)
conversion. After the conversion, using ADC read command the result is clocked out with the MSB first. If the
conversion is not executed before the ADC read command, or the ADC read command is repeated, it will give 0 as
the output result. If the ADC read command is sent during conversion the result will be 0, the conversion will not
stop and the final result will be wrong. Conversion sequence sent during the already started conversion process will
yield incorrect result as well. A conversion can be started by sending the command to MS5637. When command is
sent to the system it stays busy until conversion is done. When conversion is finished the data can be accessed by
sending a Read command, when an acknowledge is sent from the MS5637, 24 SCL cycles may be sent to receive
all result bits. Every 8 bits the system waits for an acknowledge signal.
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Low Voltage Barometric Pressure Sensor
1
1
1
0
1
1
0
0
0
A
0
1
0
0
1
0
0
0
0
A
Device Address
Device Address
command
cmd byte
S
W
P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledge
Figure 8: I2C command to initiate a pressure conversion (OSR=4096, typ=D1)
1
1
1
0
1
1
0
0
0
A
0
0
0
0
0
0
0
0
0
A
Device Address
Device Address
command
cmd byte
S
W
P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledge
Figure 9: I2C ADC read sequence
1
1
1
0
1
1
0
1
0
A
X
X
X
X
X
X
X
X
0
A
X
X
X
X
X
X
X
X
0
A
X
X
X
X
X
X
X
X
0
Device Address
Device Address
data
Data 23-16
data
Data 15 - 8
data
Data 7 - 0
S
R
N P
From Master
From Slave
S = Start Condition
P = Stop Condition
W = Write
R = Read
A = Acknowledge
N = Not Acknowledge
Figure 10: I2C answer from MS5637
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MS5637-02BA03
Low Voltage Barometric Pressure Sensor
CYCLIC REDUNDANCY CHECK (CRC)
MS5637 contains a PROM memory with 112-Bit. A 4-bit CRC has been implemented to check the data validity in
memory. The C code example below describes the CRC calculation which is stored on DB12 to DB15 in the first
PROM word.
D
B
1
D
B
1
D
B
1
D
B
1
D
B
1
D
B
1
A
d
d
0
1
2
3
4
5
6
D
B
9
D
B
8
D
B
7
D
B
6
D
B
5
D
B
4
D
B
3
D
B
2
D
B
1
D
B
0
5
4
3
2
1
0
CRC
Factory defined
C1
C2
C3
C4
C5
C6
Figure 11: Memory PROM mapping
C Code example for CRC-4 calculation:
unsigned char crc4(unsigned int n_prom[])
// n_prom defined as 8x unsigned int (n_prom[8])
{
int cnt;
unsigned int n_rem=0;
unsigned char n_bit;
// simple counter
// crc reminder
n_prom[0]=((n_prom[0]) & 0x0FFF);
n_prom[7]=0;
for (cnt = 0; cnt < 16; cnt++)
{
// CRC byte is replaced by 0
// Subsidiary value, set to 0
// operation is performed on bytes
// choose LSB or MSB
if (cnt%2==1)
else
n_rem ^= (unsigned short) ((n_prom[cnt>>1]) & 0x00FF);
n_rem ^= (unsigned short) (n_prom[cnt>>1]>>8);
for (n_bit = 8; n_bit > 0; n_bit--)
{
if (n_rem & (0x8000))
else
n_rem = (n_rem << 1) ^ 0x3000;
n_rem = (n_rem << 1);
}
}
n_rem= ((n_rem >> 12) & 0x000F);
return (n_rem ^ 0x00);
// final 4-bit reminder is CRC code
}
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Low Voltage Barometric Pressure Sensor
APPLICATION CIRCUIT
The MS5637 is a circuit that can be used in conjunction with a microcontroller in mobile altimeter applications.
Figure 12: Typical application circuit
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Low Voltage Barometric Pressure Sensor
PIN CONFIGURATION
Pin
Name
Type Function
1
VDD
P
Positive supply voltage
2
3
4
SDA
SCL
GND
I/O
I2C data
I2C clock
Ground
I
I
DEVICE PACKAGE OUTLINE
Notes: (1) Dimensions in mm
(2) General tolerance: ±0.1
Figure 13: MS5637 package outline
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Low Voltage Barometric Pressure Sensor
RECOMMENDED PAD LAYOUT
Pad layout for bottom side of the MS5637 soldered onto printed circuit board.
Reserved area:
Please do not route
tracks between pads
Figure 14: MS5637 pad layout
SHIPPING PACKAGE
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Low Voltage Barometric Pressure Sensor
MOUNTING AND ASSEMBLY CONSIDERATIONS
SOLDERING
Please refer to the application note AN808 available on our website for all soldering issues.
MOUNTING
The MS5637 can be placed with automatic Pick & Place equipment using vacuum nozzles. It will not be damaged
by the vacuum. Due to the low stress assembly the sensor does not show pressure hysteresis effects. It is important
to solder all contact pads.
CONNECTION TO PCB
The package outline of the module allows the use of a flexible PCB for interconnection. This can be important for
applications in watches and other special devices.
CLEANING
The MS5637 has been manufactured under clean-room conditions. It is therefore recommended to assemble the
sensor under class 10’000 or better conditions. Should this not be possible, it is recommended to protect the sensor
opening during assembly from entering particles and dust. To avoid cleaning of the PCB, solder paste of type “no-
clean” shall be used. Cleaning might damage the sensor!
ESD PRECAUTIONS
The electrical contact pads are protected against ESD up to 2 kV HBM (human body model). It is therefore essential
to ground machines and personnel properly during assembly and handling of the device.
The MS5637 is shipped in antistatic transport boxes. Any test adapters or production transport boxes used during
the assembly of the sensor shall be of an equivalent antistatic material.
DECOUPLING CAPACITOR
Particular care must be taken when connecting the device to the power supply. A 100nF minimum ceramic capacitor
must be placed as close as possible to the MS5637 VDD pin. This capacitor will stabilize the power supply during
data conversion and thus, provide the highest possible accuracy.
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Low Voltage Barometric Pressure Sensor
TYPICAL PERFORMANCE CHARACTERISTICS
PRESSURE AND TEMPERATURE ERROR VERSUS PRESSURE AND TEMPERATURE
(TYPICAL VALUES)
PRESSURE AND TEMPERATURE ERROR VERSUS POWER SUPPLY
(TYPICAL VALUES)
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Low Voltage Barometric Pressure Sensor
ORDERING INFORMATION
Part Number / Art. Number
Product
Delivery Form
Tape & Reel
MS563702BA03-50
Micro Altimeter Module 3x3mm
NORTH AMERICA
EUROPE
ASIA
Measurement Specialties, Inc.,
a TE Connectivity Company
45738 Northport Loop West
Fremont, CA 94538
Tel: +1 800 767 1888
Fax: +1 510 498 1578
Measurement Specialties (Europe), Ltd.,
a TE Connectivity Company
Switzerland Sàrl
Ch. Chapons-des-Prés 11
CH-2022 Bevaix
Tel: +41 32 847 9550
Measurement Specialties (China), Ltd.,
a TE Connectivity Company
No. 26 Langshan Road
Shenzhen High-Tech Park (North) Nanshan
District, Shenzhen, 518057
China
e-mail: pfg.cs.amer@meas-spec.com
Website: www.meas-spec.com
Fax: + 41 32 847 9569
e-mail: sales.ch@meas-spec.com
Website: www.meas-spec.com
Tel: +86 755 3330 5088
Fax: +86 755 3330 5099
e-mail: pfg.cs.asia@meas-spec.com
Website: www.meas-spec.com
TE.com/sensorsolutions
Measurement Specialties, Inc., a TE Connectivity company.
Measurement Specialties, TE Connectivity, TE Connectivity (logo) and EVERY CONNECTION COUNTS are trademarks. All other logos, products and/or company names referred to herein
might be trademarks of their respective owners.
The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes
no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard
Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse
of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application.
© 2015 TE Connectivity Ltd. family of companies All Rights Reserved.
DA5637-02BA03_007
000056372111 ECN2317
09/2015
SENSOR SOLUTIONS /// MS5637-02BA03
Page 18
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