MS5561C
Micro Altimeter
SPECIFICATIONS
10 - 1100 mbar / 1
–
110 kPa absolute pressure range
High accuracy temperature measurement
Integrated miniature pressure sensor 4.75 x 4.25 mm
Thin design of 1.6 mm
Piezoresistive silicon micromachined sensor
6 coefficients for software compensation stored on-chip
16 Bit ADC, sigma delta converter
3-wire serial interface
1 system clock line (32.768 kHz)
Low voltage and low power consumption
The MS5561C is a SMD-hybrid device including a precision
piezo-resistive pressure sensor and an ADC-Interface IC. It uses
a three-wire serial interface for communication. The module
dimensions of 4.75 mm x 4.25 mm and a height of only 1.6 mm
allows for up-to-date SMD design. It provides a 16 bit data word
from a pressure and temperature dependent voltage. The
MS5561C is a low power, low voltage device with automatic power
down (ON/OFF) switching. A 3-wire interface is used for all
communications with a micro-controller.
SENSOR SOLUTIONS
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MS5561C
Micro Altimeter
FEATURES
Pressure resolution 0.1 mbar
Operating temperature -40°C to +85°C
Supply voltage 2.2 V to 3.6 V
Low supply current, typ. 4 µA
Standby current < 0.1 µA
Calibrated temperature and pressure sensor for
2
nd
order compensation
ESD protected, HBM 4 kV
APPLICATIONS
Mobile phones
GPS receivers
Altimeter applications
Personal Navigation Devices (PND)
Digital cameras with altimeter function
BLOCK DIAGRAM
VDD
MCLK
Input MUX
SENSOR
+IN
dig.
Filter
Digital
Interface
ADC
DIN
DOUT
SCLK
-IN
Sensor
Interface IC
SGND
Memory
(PROM)
64 bits
GND
Fig. 1: Block diagram MS5561C
SENSOR SOLUTIONS
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MS5561C
Micro Altimeter
PIN CONFIGURATION
Fig. 2: Pin configuration of MS5561C
Pin Name
SCLK
GND
PV (1)
PEN (1)
VDD
MCLK
DIN
DOUT
Pin
1
2
3
4
5
6
7
8
Type
I
G
N
I
P
I
I
O
Function
Serial data clock
Ground
Negative programming voltage
Programming enable
Positive supply voltage
Master clock (32.768 kHz)
Serial data input
Serial data output
NOTE
1) Pin 3 (PV) and Pin 4 (PEN) are only used by the manufacturer for calibration purposes and should not be
connected.
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
5
Unit
V
°C
bar
Notes
1
NOTE
1) Storage and operation in an environment of dry and non-corrosive gases.
SENSOR SOLUTIONS
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MS5561C
Micro Altimeter
RECOMMENDED OPERATING CONDITIONS
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
V
DD
= 3.0 V
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
+25
4
1
0.1
0.5
+85
35
35.000
60/40
500
µA
mA
µA
µA
°C
ms
kHz
%
kHz
Conditions
(Ta = 25 °C, V
DD
= 3.0 V unless noted otherwise)
Min
Typ
Max
Unit
mbar
10
1100
abs.
2.2
3.0
3.6
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 MS5561C.
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 MS5561C 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.
SENSOR SOLUTIONS
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MS5561C
Micro Altimeter
ELECTRICAL CHARACTERISTICS
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
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
(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
AD-CONVERTER
Parameter
Resolution
Linear Range
Conversion Time
INL
Symbol
Conditions
Min
4'000
MCLK = 32.768 kHz
Within linear range
-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
SENSOR SOLUTIONS
///MS5561C
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