SENSOR SOLUTIONS ///MS5637-02BA03
Page 1
06/2017
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.
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 2
FEATURES
TECHNICAL DATA
FUNCTIONAL BLOCK DIAGRAM
VDD
GND
SCL
SDA
ADC
I2C Bus
Interface
Memory
(PROM)
112 bits
SENSOR
SGND
+IN
-IN
dig.
Filter
Sensor
Interface IC
FIELD OF APPLICATION
Smart-phones
Tablet PCs
Personal navigation devices
Sensor Performances (VDD = 3 V)
Pressure
Min
Typ
Max
Unit
Maximum Range
10
2000
mbar
ADC
24
bit
Resolution (1)
0.11 / 0.062/ 0.039
/ 0.028 / 0.021 /
0.016
mbar
Error band at 25°C,
300 to 1200 mbar
-2
+2
mbar
Error band, -20°C to + 85°C,
300 to 1200 mbar (2)
-4
+4
mbar
Response time (1)
0.5 / 1.1 / 2.1 / 4.1 /
8.22 / 16.44
ms
Long term stability
±1
mbar/yr
Temperature
Min
Typ
Max
Unit
Range
-40
+85
°C
Resolution
<0.01
°C
Accuracy at 25°C
-1
+1
°C
Notes: (1) Oversampling Ratio: 256 / 512 / 1024 / 2048 / 4096 / 8192
(2) With auto-zero at one pressure point
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 3
PERFORMANCE SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply voltage
VDD
-0.3
+3.6
V
Storage temperature
TS
-20
+85
°C
Overpressure
Pmax
6
bar
Maximum Soldering
Temperature
Tmax
40 sec max
250
°C
ESD rating
Human Body
Model
-2
+2
kV
Latch up
JEDEC standard
No 78
-100
+100
mA
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Operating Supply voltage
VDD
1.5
3.0
3.6
V
Operating Temperature
T
-40
+25
+85
°C
Supply current
(1 sample per sec.)
IDD
OSR 8192
4096
2048
1024
512
256
20.09
10.05
5.02
2.51
1.26
0.63
µA
Peak supply current
during conversion
1.25
mA
Standby supply current
at 25°C (VDD = 3.0 V)
0.01
0.1
µA
VDD Capacitor
from VDD to GND
100
470
nF
ANALOG DIGITAL CONVERTER (ADC)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Word
24
bit
Conversion time
tc
OSR 8192
4096
2048
1024
512
256
16.44
8.22
4.13
2.08
1.06
0.54
ms
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 4
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
Extended Pressure Range
Pext
Linear Range of
ADC
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
Resolution RMS
OSR 8192
4096
2048
1024
512
256
0.016
0.021
0.028
0.039
0.062
0.11
mbar
Maximum error with supply
voltage
VDD = 1.5 V … 3.6 V
±0.5
mbar
Long-term stability
±1
mbar/yr
Reflow soldering impact
IPC/JEDEC J-STD-020C
(See application note AN808
on http://meas-spec.com)
-1
mbar
Recovering time after reflow (2)
3
days
(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
Min.
Typ.
Max.
Unit
Absolute Accuracy
at 25°C
-20..85°C
-1
-2
+1
+2
°C
Maximum error with supply
voltage
VDD = 1.5 V … 3.6 V
±0.3
°C
Resolution RMS
OSR 8192
4096
2048
1024
512
256
0.002
0.003
0.004
0.006
0.009
0.012
°C
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 5
PERFORMANCE SPECIFICATIONS (CONTINUED)
DIGITAL INPUTS (SDA, SCL)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Serial data clock
SCL
400
kHz
Input high voltage
VIH
80% VDD
100% VDD
V
Input low voltage
VIL
0% VDD
20% VDD
V
Input leakage current
Ileak
T = 25 °C
0.1
µA
Input capacitance
CIN
6
pF
DIGITAL OUTPUTS (SDA)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output high voltage
VOH
Isource = 1 mA
80% VDD
100% VDD
V
Output low voltage
VOL
Isink = 1 mA
0% VDD
20% VDD
V
Load capacitance
CLOAD
16
pF
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 6
FUNCTIONAL DESCRIPTION
VDD
GND
SCL
SDA
ADC
I2C Bus
Interface
Memory
(PROM)
112 bits
SENSOR
SGND
+IN
-IN
dig.
Filter
Sensor
Interface IC
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
Mode
Pins used
MS563702BA03
I2C
SDA, SCL
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 7
PRESSURE AND TEMPERATURE CALCULATION
Figure 2: Flow chart for pressure and temperature reading and software compensation.
Size [1]
[bit] min max
C1
Pressure sensitivity | SENST1 unsigned int 16 16 065535 46372
C2
Pressure offset | OFFT1 unsigned int 16 16 065535 43981
C3 Temperature coefficient of pressure sensitivity | TCS unsigned int 16 16 065535 29059
C4 Temperature coefficient of pressure offset | TCO unsigned int 16 16 065535 27842
C5
Reference temperature | TREF unsigned int 16 16 065535 31553
C6 Temperature coefficient of the temperature | TEMPSENS unsigned int 16 16 065535 28165
D1
Digital pressure value unsigned int 32 24 016777216 6465444
D2
Digital temperature value unsigned int 32 24 016777216 8077636
dT
Difference between actual and reference temperature [2]
dT = D2 - TREF = D2 - C5 * 2 8
signed int 32 25 -16776960 16777216 68
2000
= 20.00 °C
OFF
Offset at actual temperature [3]
OFF = OFFT1 + TCO * dT = C2 * 217 + (C4 * dT ) / 26
signed int 64 41 -17179344900 25769410560 5764707214
SENS
Sensitivity at actual temperature [4]
SENS = SENST1 + TCS * dT = C1 * 2 16 + (C3 * dT ) / 27
signed int 64 41 -8589672450 12884705280 3039050829
110002
= 1100.02 mbar
Notes
[1]
[2]
[3]
[4]
min and max have to be defined
min and max have to be defined
Maximal size of intermediate result during evaluation of variable
120000
1000
58
P
Recommended
variable type
Description | Equation
signed int 32
Actual temperature (-40…85°C with 0.01°C resolution)
TEMP = 20°C + dT * TEMPSENS = 2000 + dT * C6 / 223
Read digital pressure and temperature data
signed int 32
Temperature compensated pressure (10…1200mbar with
0.01mbar resolution)
P = D1 * SENS - OFF = (D1 * SENS / 2 21 - OFF) / 2 15
min and max have to be defined
Convert calibration data into coefficients (see bit pattern of W1 to W4)
Variable
Example /
Typical
Value
Calculate temperature compensated pressure
8500
-4000
TEMP
41
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
Read digital pressure and temperature data
Calculate temperature
Calculate temperature compensated pressure
Display pressure and temperature value
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 8
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.
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 9
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
0
1
2
3
4
5
6
7
Bit name
PRO
M
CO
NV
-
Typ
Ad2/
Os2
Ad1/
Os1
Ad0/
Os0
Stop
Command
Reset
0
0
0
1
1
1
1
0
0x1E
Convert D1 (OSR=256)
0
1
0
0
0
0
0
0
0x40
Convert D1 (OSR=512)
0
1
0
0
0
0
1
0
0x42
Convert D1 (OSR=1024)
0
1
0
0
0
1
0
0
0x44
Convert D1 (OSR=2048)
0
1
0
0
0
1
1
0
0x46
Convert D1 (OSR=4096)
0
1
0
0
1
0
0
0
0x48
Convert D1 (OSR=8192)
0
1
0
0
1
0
1
0
0x4A
Convert D2 (OSR=256)
0
1
0
1
0
0
0
0
0x50
Convert D2 (OSR=512)
0
1
0
1
0
0
1
0
0x52
Convert D2 (OSR=1024)
0
1
0
1
0
1
0
0
0x54
Convert D2 (OSR=2048)
0
1
0
1
0
1
1
0
0x56
Convert D2 (OSR=4096)
0
1
0
1
1
0
0
0
0x58
Convert D2 (OSR=8192)
0
1
0
1
1
0
1
0
0x5A
ADC Read
0
0
0
0
0
0
0
0
0x00
PROM Read
1
0
1
0
Ad2
Ad1
Ad0
0
0xA0 to
0xAE
Figure 4: Command structure
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 10
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.
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.
Figure 6: I2C Command to read memory address= 011
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.
111011 0 00000111100
S W A A P
From Master
S = Start Condition
W = Write A = Acknowledge
From Slave P = Stop Condition R = Read
N = Not Acknowledge
cmd byte
Device Address
Device Address
command
111011 0 00101001100
S W A A P
From Master
S = Start Condition
W = Write A = Acknowledge
From Slave P = Stop Condition R = Read
N = Not Acknowledge
Device Address
Device Address
cmd byte
command
1 1 1 0 1 1 0 1 0 X X X X X X X X 0 X X X X X X X X 0
S R A A N P
From Master
S = Start Condition
W = Write A = Acknowledge
From Slave P = Stop Condition R = Read N = Not Acknowledage
Memory bit 7 - 0
Device Address
Device Address
Memory bit 15 - 8
data
data
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 11
Figure 8: I2C command to initiate a pressure conversion (OSR=4096, typ=D1)
Figure 9: I2C ADC read sequence
Figure 10: I2C answer from MS5637
1 1 1 0 1 1 0 0 0 0 1 0 0 1 0 0 0 0
S W A A P
From Master
S = Start Condition
W = Write A = Acknowledge
From Slave P = Stop Condition R = Read
N = Not Acknowledge
cmd byte
Device Address
Device Address
command
1 1 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0
S W A A P
From Master
S = Start Condition
W = Write A = Acknowledge
From Slave P = Stop Condition R = Read
N = Not Acknowledge
Device Address
Device Address
cmd byte
command
1
1
1
0
1
1
0
1
0
X
X
X
X
X
X
X
X
0
X
X
X
X
X
X
X
X
0
X
X
X
X
X
X
X
X
0
S
R
A
A
A
N
P
From Master
S = Start Condition
W = Write
A = Acknowledge
From Slave
P = Stop Condition
R = Read
N = Not Acknowledge
Data 7 - 0
Data 15 - 8
Device Address
Device Address
data
data
Data 23-16
data
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 12
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.
A
d
d
D
B
1
5
D
B
1
4
D
B
1
3
D
B
1
2
D
B
1
1
D
B
1
0
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
0
CRC
Factory defined
1
C1
2
C2
3
C3
4
C4
5
C5
6
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; // simple counter
unsigned int n_rem=0; // crc reminder
unsigned char n_bit;
n_prom[0]=((n_prom[0]) & 0x0FFF); // CRC byte is replaced by 0
n_prom[7]=0; // Subsidiary value, set to 0
for (cnt = 0; cnt < 16; cnt++) // operation is performed on bytes
{ // choose LSB or MSB
if (cnt%2==1) n_rem ^= (unsigned short) ((n_prom[cnt>>1]) & 0x00FF);
else n_rem ^= (unsigned short) (n_prom[cnt>>1]>>8);
for (n_bit = 8; n_bit > 0; n_bit--)
{
if (n_rem & (0x8000)) n_rem = (n_rem << 1) ^ 0x3000;
else n_rem = (n_rem << 1);
}
}
n_rem= ((n_rem >> 12) & 0x000F); // final 4-bit reminder is CRC code
return (n_rem ^ 0x00);
}
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 13
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
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 14
PIN CONFIGURATION
Pin
Name
Type
Function
1
VDD
P
Positive supply voltage
2
SDA
I/O
I2C data
3
SCL
I
I2C clock
4
GND
I
Ground
DEVICE PACKAGE OUTLINE
Notes: (1) Dimensions in mm
(2) General tolerance: ±0.1
Figure 13: MS5637 package outline
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 15
RECOMMENDED PAD LAYOUT
Pad layout for bottom side of the MS5637 soldered onto printed circuit board.
Figure 14: MS5637 pad layout
SHIPPING PACKAGE
Reserved area:
Please do not route
tracks between pads
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 16
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.
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 17
TYPICAL PERFORMANCE CHARACTERISTICS
PRESSURE AND TEMPERATURE ERROR VERSUS PRESSURE AND TEMPERATURE
(TYPICAL VALUES)
PRESSURE AND TEMPERATURE ERROR VERSUS POWER SUPPLY
(TYPICAL VALUES)
MS5637-02BA03
Low Voltage Barometric Pressure Sensor
SENSOR SOLUTIONS /// MS5637-02BA03
06/2017
Page 18
ORDERING INFORMATION
Part Number / Art. Number
Product
Delivery Form
MS563702BA03-50
Micro Altimeter Module 3x3mm
Tape & Reel
TE.com/sensorsolutions
Measurement Specialties, Inc., a TE Connectivity company.
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