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PDF MS5805-02BA01 Data sheet ( Hoja de datos )
| Número de pieza | MS5805-02BA01 | |
| Descripción | Miniature Altimeter Module | |
| Fabricantes | TE | |
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MS5805-02BA01
Miniature Altimeter Module
SPECIFICATIONS
High resolution module, 20 cm
Fast conversion down to 0.5 ms
Low power, 0.6 µA (standby < 0.15 µA at 25°C)
Integrated digital pressure sensor (24 bit ΔΣ ADC)
Supply voltage 1.8 to 3.6 V
Operating range: 300 to 1200 mbar, -40 to +85 °C
Extended pressure range: 10 to 2000 mbar
I2C interface
No external components (Internal oscillator)
Excellent long term stability
Sealing designed for 2.5 x 1mm O-ring
The MS5805-02BA is a new generation of high-resolution
altimeter sensors from MEAS Switzerland with I2C bus interface.
It is optimized for altimeters and variometers with an altitude
resolution of 20 cm. 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 MS5805-02BA can be interfaced to
virtually any microcontroller. The communication protocol is
simple, without the need of programming internal registers in the
device. 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 have 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 ///MS5805-02BA01
09/2015
Page 1
1 page  
MS5805-02BA01
Miniature Altimeter Module
PERFORMANCE SPECIFICATIONS (CONTINUED)
DIGITAL INPUTS (SDA, SCL)
Parameter
Serial data clock
Input high voltage
Input low voltage
Input leakage current
Symbol
SCL
VIH
VIL
Ileak25°C
Ileak85°C
DIGITAL OUTPUTS (I2C, DOUT)
Conditions
at 25°c
Min.
80% VDD
0% VDD
Parameter
Output high voltage
Output low voltage
Load capacitance
Symbol
VOH
VOL
CLOAD
Conditions
Isource = 0.6 mA
Isink = 0.6 mA
Min.
80% VDD
0% VDD
Typ.
Max
400
100% VDD
20% VDD
0.1
Unit
kHz
V
V
µA
Typ.
16
Max
100% VDD
20% VDD
Unit
V
V
pF
SENSOR SOLUTIONS /// MS5805-02BA01
09/2015
Page 5
5 Page 
MS5805-02BA01
Miniature Altimeter Module
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 MS5805 to function is
to send several SCLs followed by a reset sequence or to repeat power on reset.
111011 0 00000111100
Device Address
command
S Device Address W A
cmd byte
AP
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.
111011 0 00101001100
Device Address
command
S Device Address W A
cmd byte
AP
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
111011 0 10XXXXXXXX0XXXXXXXX0
Device Address
data
data
S Device Address R A Memory bit 15 - 8 A Memory bit 7 - 0 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 MS5805
SENSOR SOLUTIONS /// MS5805-02BA01
09/2015
Page 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MS5805-02BA01.PDF ] | |
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