Fully digital, pressure calibrated and temperature compensated
output
I
2
C Digital Interface
Compensated temperature range: -20 to +85
o
C
Better than 1% initial accuracy and less than 1% accuracy shift over life
•
(<1% shift over 1000hr HTOL)
Differential pressure configuration
Custom pressure ranges available
Insensitive to mounting orientation
Manufactured according to ISO9001 and ISO/TS 16949 standards
Pressure ranges from -15 to 15 PSI
DESCRIPTION
The SM3041 Series is a digital, medium pressure MEMS sensor
family offering state-of-the-art pressure transducer technology
and CMOS mixed signal processing technology to produce a
digital, fully signal conditioned, multi-order pressure and
temperature compensated sensor in JEDEC standard SOIC-16
package with a dual vertical porting option. It is available as a
differential sensor or with custom pressure ranges.
Combining the pressure sensor with a signal-conditioning ASIC in a
single package simplifies the use of advanced silicon micro-machined
pressure sensors. The pressure sensor can be mounted directly on a
standard printed circuit board and a high level, calibrated pressure
signal can be acquired from the digital interface. This eliminates the
need for additional circuitry, such as a compensation network or
microcontroller containing a custom correction algorithm.
The SM3041 is shipped in sticks or tape & reel.
Medical
Ventilators
Oxygenators
Fluid Evacuation
Gas Flow Instrumentation
Patient Monitoring
Blood Pressure Monitor
Negative Pressure Wound Therapy
Industrial
Gas Flow instrumentation
Pneumatic Gages
Pressure Switches
Life Sciences
Consumer
Sport Equipment
Appliances
Silicon Microstructures, Inc. 2001-2016. All rights reserved
DOC # 40DS3041.01
+1-(408) 577-0100
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sales@si-micro.com
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www.si-micro.com
Page 1
SM3041 Series
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Absolute Maximum Ratings
No.
1
2
3
4
5
Characteristic
Supply Voltage
Supply Current
Update Period
Operating Temperature
(a)
Storage Temperature
(a)
Symbol
V
DD
I
DD
Minimum
0.0
0.0
Typical
-
2.0
Maximum
6.0
4.0
2
Units
V
mA
ms
°C
°C
T
OP
T
STG
-20
-40
+85
+125
Notes:
a. Tested on a sample basis.
No.
6
7
Product Number
SM3041-005-D-C-3-S
SM3041-015-D-C-3-S
Operating
Pressure
-5 to 5 PSI
-15 to 15 PSI
Proof Pressure (P
PROOF
)
(a)
Burst Pressure (P
BURST
)
(a)
25 PSI
45 PSI
40 PSI
75 PSI
Notes:
a. Tested on a sample basis.
Operating Characteristics - Specifications
All parameters are specified at Vdd = 3.3 V supply voltage at 25
o
C, unless otherwise noted.
No.
8
9
10
11
12
13
14
Characteristic
Supply Voltage
Pressure Output @ P
MIN
Pressure Output @ P
MAX
Full Scale (P
MIN
to P
MAX
) Span
Resolution
Accuracy
(b)
Compensated Temperature Range
Symbol
V
DD
OUT
MIN
OUT
MAX
FSP
Minimum
3.0
Typical
3.3
1,638
14,745
13,107
14
Maximum
3.6
Units
V
Counts
Bits
+1
+85
%FS
o
C
ACC
T
COMP
-1
-20
Notes:
b. The accuracy specification applies over all operating conditions. This specification includes the combination of linearity, repeatability, and hysteresis errors
over pressure, temperature, and voltage.
Silicon Microstructures, Inc. 2001-2016. All rights reserved
DOC # 40DS3041.01
+1-(408) 577-0100
|
sales@si-micro.com
I
www.si-micro.com
Page 2
SM3041 Series
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SM3041 – I
2
C Communications
1. SCL Clock frequency:
•
100kHz to 400kHz
2. Slave Address
•
The factory setting for the I
2
C slave address is 28HEX. The
part will only respond to the set address.
•
For the Read_DF3 data fetch command (Data Fetch 3
Bytes), the SM3041 returns three bytes in response to
the master sending the slave address and the READ bit
(1): two bytes of bridge data with the two status bits as
the MSBs and then 1 byte of temperature data (8-bit
accuracy). After receiving the required number of data
bytes, the master sends the NACK and stop condition to
terminate the read operation.
For the Read_DF4 command, the master delays sending
the NACK and continues reading an additional final byte
to acquire the full corrected 11-bit temperature
measurement. In this case, the last 5 bits of the final byte
of the packet are undetermined and should be masked
off in the application.
The Read_DF2 command is used if corrected
temperature is not required. The master terminates the
READ operation after the two bytes of bridge data.
3. Read Operations
•
For read operations, the I
2
C master command starts with
the 7-bit slave address with the 8th bit = 1 (READ). The
SM3041 as the slave sends an acknowledge (ACK)
indicating success.
•
•
The SM3041 has four
read commands: Read_DF2,
Read_DF3, and Read_DF4. The following figures show
the structure of the measurement packet for three of the
four I
2
C read commands, which are further explained
below.
•
I
2
C
3.1 I
2
C Read_DF (Data Fetch):
•
For the Data Fetch commands, the number of data bytes
returned by the SM3041 is determined by when the
master sends the NACK and stop condition.
Silicon Microstructures, Inc. 2001-2016. All rights reserved
DOC # 40DS3041.01
+1-(408) 577-0100
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sales@si-micro.com
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SM3041 Series
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Parameter
SCL Clock Frequency
Start Condition Hold Time Relative to SCL Edge
Minimum SCL Clock Low Width1
Minimum SCL Clock High Width1
Start Condition Hold Time Relative to SCL Edge
Data Hold Time on SDA Relative to SCL Edge
Data Setup Time on SDA Relative to SCL Edge
Stop Condition Setup Time on SCL
Bus Free Time Between Stop Condition and Start Condition
Symbol
FSCL
tHDSTA
tLOW
tHIGH
tSUSTA
tHIDDAT
tSUDAT
tSUSTO
tBUS
Minimum Typical Maximum Units
100
0.1
0.6
0.6
0.1
0.0
0.1
0.1
2.0
400
kHz
µs
µs
µs
µs
µs
µs
µs
µs
Silicon Microstructures, Inc. 2001-2016. All rights reserved
DOC # 40DS3041.01
+1-(408) 577-0100
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sales@si-micro.com
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Page 4
SM3041 Series
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5. Differences SM3041 I
2
C Protocol vs. Original I
2
C protocol
•
•
Note: There are three differences in the SM3041 protocol
compared with the original I
2
C protocol
Sending a start-stop condition without any transitions on
the CLK line (no clock pulses in between) created a
communication error for the next communication, even if
the next start condition is correct and the clock pulse is
applied. An additional start condition must be sent, which
results in restoration of proper communication.
•
The restart condition - a falling SDA edge during data
transmission when the CLK clock line is still high -
creates the same situation. The next communication
fails, and an additional start condition must be sent
for correct communication.
A failing SDA edge is not allowed between the start
condition and the first rising SCL edge. If using an I
2
C
address with the first bit 0, SDA must be held low
from the start condition though the first bit.
•
6. Diagnostic Features – Status Bits
The SM3041 offers diagnostic features to ensure robust
system operation. The diagnostic states are indicated by a
transmission of the status of the 2 MSBs of the pressure high
byte data.
Status Bits (2 MSBs of Output Packet)
00
01
10
(1)
11
Symbol
Normal operation, good data packet
Device in Command Mode (not applicable for normal operation)
Stale data: Data that has already been fetched since the last measurement
cycle
Diagnostic condition exists
Note
(1)
:
If a data fetch is performed before or during the first measurement after power-on reset, then “stale” will be returned, but
this data is actually invalid because the first measurement has not been completed.
•
When the two MSBs are 11, one of the following faults listed
below is indicated:
•
Invalid EEPROM signature
•
Loss of bridge positive or negative
•
Bridge input short
•
Loss of bridge source
•
All diagnostics are detected in the next
measurement cycle and reported in the subsequent
data fetch. Once a diagnostic is reported, the
diagnostic status bits will not change unless both the
cause of the diagnostic is fixed and a power-on-reset
is performed.
Silicon Microstructures, Inc. 2001-2016. All rights reserved
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