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MS5803-02BA Datasheet(PDF) 13 Page - TE Connectivity Ltd

Part No. MS5803-02BA
Description  High resolution module, 20cm
Download  19 Pages
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Maker  TEC [TE Connectivity Ltd]
Homepage  http://www.te.com/usa-en/home.html
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MS5803-02BA Datasheet(HTML) 13 Page - TE Connectivity Ltd

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MS5803-02BA
Miniature Altimeter Module
SENSOR SOLUTIONS ///MS5803-02BA
09/2015
Page 13
I2C INTERFACE
COMMANDS
Each I2C communication message starts with the start condition and it is ended with the stop condition. The
MS5803-02BA address is 111011Cx, where C is the complementary value of the pin CSB. Since the IC does not
have a microcontroller inside, the commands for I2C and SPI are quite similar.
RESET SEQUENCE
The reset can be sent at any time except when the power on did not work it could be possible that the acknowledge
blocks the SDA. When SDA is blocked by an undefined state the only way to get the MS5803-02BA to work is to
send a power on reset.
Figure 10: I2C Reset Command
CONVERSION SEQUENCE
A conversion can be started by sending the command to MS5803-02BA. 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 appears from the MS5803-02BA, you may then send 24 SCLK cycles to get all
result bits. Every 8 bit the system waits for an acknowledge signal.
Figure 13: I2C Command to initiate a pressure conversion (OSR=4096, typ=D1)
Figure 14: I2C ADC read sequence
Figure 15: I2C pressure response (D1) on 24 bit from MS5803-02BA
1 1
1 0 1
1 CSB 0 0
0 0
0 1 1
1 1 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 CSB 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
command
cmd byte
Device Address
Device Address
1 1
1 0 1
1 CSB 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
command
Device Address
Device Address
cmd byte
1 1
1 0 1
1 CSB 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
data
data
Device Address
Device Address
Data 23-16
Data 7 - 0
Data 8 - 15


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