Data Sheet

MS5837-30BA
Ultra Small Gel Filled Pressure Sensor
SENSOR SOLUTIONS /// MS5837-30BA
10/11/2015
11
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 MS5837-30BA.
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 acknowledge is sent from the MS5837-30BA, 24 SCL
cycles may be sent to receive all result bits. Every 8 bits the system waits for an acknowledge signal.
I
2
C command to initiate a pressure conversion (OSR=4096, typ=D1)
I
2
C ADC read sequence
I
2
C answer from MS5837-30BA
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
F rom Master
S = S tart C ondition
W = Write
A = A cknow ledge
F rom S lave
P = Stop C ondition
R = Read
N = Not A cknow ledge
Data 7 - 0
Data 15 - 8
Dev ice A ddress
Dev ice A ddress
data
data
Data 23-16
data