MS5541C
Miniature 14 bar Module
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0 – 14 bar absolute pressure range
6 coefficients for software compensation stored on-chip
Piezoresistive silicon micromachined sensor
Integrated miniature pressure sensor 6.2 x 6.4 mm
16 Bit ADC
3-wire serial interface
1 system clock line (32.768 kHz)
Low voltage and low power consumption
High Endurance (HM version)
DESCRIPTION
The MS5541C is the miniature version of MS5535C pressure sensor module. The MS5541-HM is the high
endurance pad technology version of MS5541C pressure sensor module. It contains a precision piezoresistive
pressure sensor and an improved version of the 16 Bit Micropower Sensor interface IC known from the
MS5535C. Compared to the previous version the ESD sensitivity has been improved to 4kV on all pins. In
addition to this the MS5541C is from its outer dimensions compatible to the MS54xx series of pressure sensors.
It uses an antimagnetic polished stainless steel ring for sealing with O-ring. The sensor provides 16 Bit pressure
and temperature data via a 3 wire serial interface that can be easily interfaced with 4 Bit low power
microcontrollers. 64 Bit of factory programmed PROM provides calibration data for a highly accurate pressure
and temperature calculation. The MS5541C is fully software compatible to the MS5535C and previous versions
of MS5541.
FEATURES
FIELD OF APPLICATION
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Diving computers and watches
Mobile water depth and measurement systems
High endurance pad technology (HM version)
TECHNICAL DATA
Sensor Performances (V
DD
= 3 V)
Pressure
Range
ADC
Min
0
16
1.2
-50
-60
35
20
Min
-40
0.005
-0.8
Typ
Max
+85
0.015
+0.8
+20
+180
Typ
Max
14
Unit
bar
bit
mbar
mbar
mbar
ms
mbar/yr
Unit
°C
°C
°C
FUNCTIONAL BLOCK DIAGRAM
VDD
MCLK
Input MUX
SENSOR
+IN
dig.
Filter
Digital
Interface
ADC
DIN
DOUT
SCLK
Resolution
Accuracy 0°C to +40°C,
0 to 10 bar
Accuracy -40°C to
+85°C
0 to 10 bar
Response time
Long term stability
-IN
Sensor
Interface IC
SGND
Memory
(PROM)
64 bits
Temperature
Range
GND
Resolution
Accuracy
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0005541C1194 ECN2178
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MS5541C
Miniature 14 bar Module
PERFORMANCE SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply voltage
Storage temperature
Overpressure
Symbol
V
DD
T
S
P
Conditions
Ta = 25 °C
Ta = 25 °C
Min
-0.3
-40
Max
4
+85
30
Unit
V
°C
bar
Notes
1
2
NOTES
1) Storage and operation in an environment of dry and non-corrosive gases.
2) The MS5541C is qualified referring to the ISO 6425 standard and can withstand an absolute pressure of 30
bar in salt water.
ELECTRICAL CHARACTERISTICS
Parameter
Operating pressure range
Supply voltage
Supply current,
average (1)
during conversion (2)
standby (no conversion)
Current consumption into MCLK
(3)
Operating temperature range
Conversion time
External clock signal (4)
Duty cycle of MCLK
Serial data clock
Symbol
p
V
DD
I
avg
I
sc
I
ss
MCLK = 32.768 kHz
T
t
conv
MCLK
SCLK
-40
MCLK = 32.768 kHz
30.000
40/60
32.768
50/50
Conditions
(Ta = 25 °C, V
DD
= 3.0 V unless noted otherwise)
Min
Typ
Max
Unit
0
14
bar
2.2
3.0
3.6
V
4
1
0.1
0.5
+85
35
35.000
60/40
500
µA
mA
µA
µA
°C
ms
kHz
%
kHz
V
DD
= 3.0 V
NOTES
1) Under the assumption of one conversion every second. Conversion means either a pressure or a
temperature measurement started by a command to the serial interface of MS5541C.
2) During conversion the sensor will be switched on and off in order to reduce power consumption; the total on
time within a conversion is about 2 ms.
3) This value can be reduced by switching off MCLK while MS5541C is in standby mode.
4) It is strongly recommended that a crystal oscillator be used because the device is sensitive to clock jitter. A
square-wave form of the clock signal is a must.
ANALOG DIGITAL CONVERTER (ADC)
Parameter
Resolution
Linear Range
Conversion Time
INL
DA5541C_009
0005541C1194 ECN2178
Symbol
Conditions
Min
4'000
MCLK = 32.768 kHz
Within linear range
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-5
(T = -40 °C .. 85 °C V
DD
= 2.2 V .. 3.6 V)
Typ
Max
Unit
16
Bit
40'000
LSB
35
ms
+5
LSB
Apr. 01, 2014
MS5541C
Miniature 14 bar Module
PERFORMANCE SPECIFICATIONS (CONTINUED)
PRESSURE OUTPUT CHARACTERISTICS
With the calibration data stored in the interface IC of the MS5541C, the following characteristics can be
achieved:
Parameter
Resolution
Absolute Pressure Accuracy
(Temperature range 0 .. +40 °C)
Absolute Pressure Accuracy
(Temperature range -40 .. +85 °C)
Error over Temperature
(p = const. relative to 20 °C)
Long-term Stability
Maximum Error over Supply
Voltage
Conditions
p = 0 .. 5 bar
p = 0 .. 10 bar
p = 0 .. 14 bar
p = 0 .. 5 bar
p = 0 .. 10 bar
p = 0 .. 14 bar
Ta = -40 .. +85 °C
6 months
V
DD
= 2.2 .. 3.6 V
p = const.
Min
-20
-40
-100
-40
-60
-160
-10
20
-16
16
(V
DD
= 3.0 V unless noted otherwise)
Typ
Max
Unit
Notes
1.2
mbar
1
+20
+20
mbar
2
+20
+100
+180
mbar
3
+200
+100
mbar
mbar
mbar
4
NOTES
1) A stable pressure reading of the given resolution requires taking the average of 2 to 4 subsequent pressure
values due to noise of the ADC.
2) Maximum error of pressure reading over the pressure range.
3) With the second-order temperature compensation as described in Section "FUNCTION". See next section
for typical operating curves.
4) The long-term stability is measured with non-soldered devices.
TEMPERATURE OUTPUT CHARACTERISTICS
This temperature information is not required for most applications, but it is necessary to allow for temperature
compensation of the pressure output.
Parameter
Resolution
Accuracy
Maximum Error over Supply
Voltage
Conditions
T = 20 °C
P = 0 .. 10bar
T = -40 .. + 85°C
V
DD
= 2.2 .. 3.6 V
Min
0.005
-0.8
-2
-0.2
(V
DD
= 3.0 V unless noted otherwise)
Typ
Max
Unit
Notes
0.01
0.015
°C
0.8
+6
+0.2
°C
°C
°C
1
2
NOTES
1) With the second-order temperature compensation as described in Section "FUNCTION". See next section
for typical operating curves.
2) At Ta = 25 °C.
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MS5541C
Miniature 14 bar Module
PERFORMANCE SPECIFICATIONS (CONTINUED)
DIGITAL INPUTS
Parameter
Input High Voltage
Input Low Voltage
Signal Rise Time
Signal Fall Time
Symbol
V
IH
V
IL
t
r
t
f
Conditions
Min
80% V
DD
0% V
DD
(T = -40 °C .. 85 °C, V
DD
= 2.2 V .. 3.6 V)
Typ
Max
Unit
100% V
DD
V
20% V
DD
V
200
ns
200
ns
DIGITAL OUTPUTS
(T = -40 °C .. 85 °C V
DD
= 2.2 V .. 3.6 V)
Parameter
Output High Voltage
Output Low Voltage
Signal Rise Time
Signal Fall Time
Symbol
V
OH
V
OL
t
r
t
f
Conditions
I
source
= 0.6 mA
I
sink
= 0.6 mA
Min
80% V
DD
0% V
DD
Typ
Max
100% V
DD
20% V
DD
Unit
V
V
ns
ns
200
200
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MS5541C
Miniature 14 bar Module
TYPICAL PERFORMANCE CURVES
ADC-value D1 vs Pressure (typical)
30000
25000
ADC-value D1 (LSB)
20000
-40°C
25°C
85°C
15000
10000
0
2000
4000
6000
8000
10000
12000
14000
Pressure (mbar)
ADC-value D2 vs Temperature (typical)
40000
35000
ADC-value D2 (LSB)
30000
25000
20000
15000
-40
-20
0
20
Temperature (°C)
40
60
80
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