MS5534A
♦
♦
♦
♦
BAROMETER MODULE
Integrated pressure sensor
Pressure range 300-1100 mbar
15 Bit ADC
6 coefficients for a software
compensation stored on-chip
♦
3-wire serial interface
♦
1 system clock line (32.768 kHz)
♦
Low voltage / low power
DESCRIPTION
The MS5534A is a SMD-hybrid device including a piezoresistive pressure sensor and an ADC-Interface IC. It
provides a 16 Bit data word from a pressure- and temperature-dependent voltage. Additionally the module
contains 6 readable coefficients for a highly accurate software calibration of the sensor. MS5534A 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 microcontroller. Sensor packaging options are plastic or metal cap.
FEATURES
•
•
•
•
•
•
15-Bit ADC resolution
Supply voltage 2.2 V to 3.6 V
Low Supply current
-40°C to +60°C
Small size
No external components required
APPLICATIONS
•
•
•
•
Mobile altimeter/barometer systems
Weather control systems
Adventure or multi-mode watches
GPS Receivers
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 5534
DA5534_022.doc
ECN493
July 17th, 2002
1
PIN CONFIGURATION
PEN 7
6
5
4
3
2
1
VDD
MCLK
DIN
DOUT
SCLK
GND
6
5
4
3
2
1
PV 8
Fig. 2: Pin configuration of MS5534
PIN DESCRIPTION
Pin Name
VDD
MCLK
DIN
DOUT
SCLK
GND
PV
PEN
Pin
6
5
4
3
2
1
8
7
Type
P
I
I
O
I
G
N
I
Function
Positive Supply Voltage
Master Clock (32.768kHz)
Data Input
Data Output
Serial Data Clock
Ground
Negative Programming Voltage
Programming Enable
Note: Pins 7 (PEN) and 8 (PV) are only used by the manufacturer for calibration purposes and should not be
connected.
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Overpressure
Storage Temperature
Symbol
V
DD
P
T
Stg
Conditions
Min
-0.3
Max
4
4
+70
Unit
V
bar
abs
o
C
-20
Notes:
1. Storage and operation in an environment of dry and non-corrosive gases.
DA5534_022.doc
ECN493
July 17th, 2002
2
RECOMMENDED OPERATING CONDITIONS
(T=25°C, VDD=3.0V unless noted otherwise)
Parameter
Supply Voltage
Supply Current,
average (1)
during conversion (2)
standby (no conversion)
Current consumption into
MCLK (3)
Operating pressure range
Operating temperature
range
Conversion time
External clock signal (4)
Duty cycle of MCLK
Serial Data Clock
Symbol
V
DD
I
avg
I
SC
I
ss
Conditions
V
DD
= 3.0 V
Min.
2.2
Typ.
3.0
5
1
Max
3.6
Unit
V
µA
mA
µA
µA
mbar
abs.
°C
ms
Hz
%
kHz
MCLK=32768Hz
p
T
a
T
conv
MCLK
SCLK
MCLK=32768Hz
30000
40/60
32768
50/50
300
-10
+25
3.5
0.5
1100
+60
35
35000
60/40
500
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 MS5534.
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 2ms.
3. This value can be reduced by switching off MCLK while MS5534 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.
5. Reliable operation requires protection of the pressure sensor from direct contact with light.
6. Power supply pins (VDD, GND) must be decoupled with a tantalum (47µF) capacitor placed close to the
module.
DA5534_022.doc
ECN493
July 17th, 2002
3
ELECTRICAL CHARACTERISTICS
Digital inputs
(T=-40°C .. 60°C)
Parameter
Input High Voltage
Input Low Voltage
Signal Rise Time
Signal Fall Time
Symbol
V
IH
V
IL
t
R
t
f
Conditions
V
DD
= 2.2…3.6V
V
DD
= 2.2…3.6 V
Min
80%
V
DD
0%
V
DD
Typ
Max
100%
V
DD
20%
V
DD
Unit
V
V
ns
ns
200
200
Digital outputs
(T=-40°C .. 60°C, V
DD
= 2.2V..3.6V)
Parameter
Output High Voltage
Output Low Voltage
Signal Rise Time
Signal Fall Time
AD-converter
Symbol
V
OH
V
OL
t
r
t
f
Conditions
I
Source
= 0.6 mA
I
Sink
= 0.6 mA
Min
75%
V
DD
0%
V
DD
Typ
Max
100%
V
DD
20%
V
DD
Unit
V
V
ns
ns
200
200
(T=25°C, V
DD
=3.0V)
Parameter
Resolution (1)
Conversion Time
Accuracy (2)
Symbol
Conditions
Min
Typ
15
Max
Unit
Bit
MCLK=32768Hz
2
35
7
ms
LSB
Notes:
7. The ADC output range is from 5,000 counts to 37,000 counts, thus providing a 16-Bit output word.
8. Accuracy limited by the non-linearity of the ADC.
DA5534_022.doc
ECN493
July 17th, 2002
4
PRESSURE OUTPUT CHARACTERISTICS
With the calibration data provided by the MS5534 system (stored in the interface IC) the following characteristics
can be achieved:
Parameter
Resolution
Absolute Pressure Accuracy
Relative Pressure Accuracy
Maximum Error over
Temperature
Long-term Stability
Maximum Error over Supply
Voltage
Conditions
p = 750 …1100mbar
T
a
= 25°C
p = 750 …1100mbar
T
a
= 25°C
T
a
= -10…+60°C
p = const.
12 month
VDD = 2.2…3.6V
-1.5
Min
-1.5
-0.5
-1
-1
-1
0
+1.5
Typ
0.1
Max
+1.5
+0.5
+1
+6
Unit
mbar
mbar
mbar
mbar
mbar
mbar
mbar/V
Note
1
2
3
4
5
6
Notes:
1.
A stable pressure reading of the given resolution requires to take the average of 2 to 4 subsequent pressure
values due to noise of the ADC. A better resolution can be obtained with more averaging.
2.
Maximum error of pressure reading over the pressure range.
3.
Maximum error of pressure reading over the pressure range after offset adjustment at one pressure point.
4.
With the second-order temperature compensation as described in Section "Calculation of pressure using
compensation coefficients C1 to C5".
5.
With the first-order temperature compensation as described in Section "Calculation of pressure using
compensation coefficients C1 to C5".
6.
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. The reference temperature is 20°C.
Parameter
Resolution
Accuracy
Maximum Error over Supply
Voltage
at reference temperature
VDD = 2.2…3.6V
Conditions
Min
0.005
-0.8
-0.08
Typ
Max
0.015
0.8
+ 0.08
Unit
°C
°C
°C/V
Notes:
1. Refer to the paragraph second-order temperature compensation in the section ‘FUNCTION’
DA5534_022.doc
ECN493
July 17th, 2002
5
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