REL
P
ARY
IMIN
DATA SHEET
LP Series – Digital
LP Series - Digital
is a surface mountable pressure sensor package with a
compensated digital output suitable fo
ultra-low pressure sensing applications.
COMPANY:
Merit Sensor is a leader in piezoresistive
pressure sensing and partners with clients to create high
performing solutions for a variety of applications and industries.
SENTIUM:
Merit Sensor products incorporate a proprietary
Sentium
®
technology developed to provide a best-in-class operating
temperature range (-40°C to 85°C) and superior stability.
TECHNOLOGY:
Merit Sensor utilizes a piezoresistive Wheatstone
bridge in a design that anodically bonds glass to a chemically etched
silicon diaphragm. All products are RoHS compliant.
CAPABILITIES:
Merit Sensor designs, engineers, fabricates,
dices, assembles, tests, sells and services die and packaged
products from a state-of-the-art facility near Salt Lake City, Utah.
FEATURES
Pressure
Range
Output
Type
Media
Packaging
0.15 to 1 psi (10.3 to 68.9 mbar; 1.03 to 6.89 KPa;
4.2 to 27.7 in H
2
O)
I
2
C
Gage and Differential
Clean, Dry Air and Non-corrosive Gases
Tape and Reel
1420 Family
Part Number Configurator
1420-XXXX-XX11-111
Pressure
P15 = .15psi
P30 = .30psi
1P0 = 1.0psi
Pin Type
1 = J-lead
Reference
D = Differential
G = Gage
Port
1 = Dual
horizontal,
facing same
direction
Customization
Sensitivity, Resistance, Bridge, Constraint, etc.
Clock Speed
Input Buffer
1 = None
BENEFITS
Performance
Enjoy best-in-class performance due to Merit’s
proprietary Sentium technology
Cost
Security
Save money over time with high-performing die
Feel confident doing business with an experienced
company backed by a solid parent company
(NASDAQ: MMSI)
Get to market quickly with creative and
flexible solutions
Experience prompt, personal and
professional support
1 = 1MHz
I
2
C Address
0 = 0x28
1 = 0x38
2 = 0x48
3 = 0x58
4 = 0x68
5 = 0x78
6 = Open*
*Device
will respond to any address.
Update Rate
1 = 5ms
Operation Mode
1 = Update mode
constant
Speed
Service
Sales
+1 801.208.4722
·
Customer Service
+1 801.208.4700
·
Fax
+1 801.208.4798
·
sensors@merit.com
·
www.MeritSensor.com
1600 W. Merit Parkway
·
South Jordan, Utah
·
84095
·
USA
1420seriesDS.005
SPECIFICATIONS
Parameter
Electrical
Supply Voltage (Vdd)
Supply Current
Operating Temperature
Storage Temperature
Performance
Pressure ADC Resolution
Pressure Accuracy
Startup time
Digital update time
Proof Pressure
Burst Pressure
Transfer Function Formula
0.5
5X
10 psi
-1.5
-40
-55
4.5
5
3
Minimum
REL
P
Typical
ARY
IMIN
Maximum
5.5
85
100
14
1.5
Units
V
mA
°C
°C
Bits
% FSO
ms
125
ms
(4)
(2) (3)
(1)
Notes
LP Series – Digital
15
Notes:
(1)
@5V input voltage,
(2)
Over 0°C to 60°C
(3)
Applicable if Vdd = 4.75V
to 5.25V
(4)
Full scale pressure
Media Compatibility
For Use With Non-corrosive Dry Gasses
Solder temperature: max 250 °C, 5 seconds max
DIMENSIONS
(millimeters)
2.5
2.5
2.5
8
8
7
6
5
2.2
12.7
11.4
11.3
7
6
5
3.6
2.5
1
1.3
Device Pinout
P1
= Vdd - Supply voltage
P2
= N/C
P3
= N/C
P4
= VSS - Ground
P5
= N/C
P6
= I
2
C conversion complete signal
P7
= SDA - I
2
C data
P8
= SCL - I
2
C clock
VSS
2.5
2.5
2.5
Sales
+1 801.208.4722
·
Customer Service
+1 801.208.4700
·
Fax
+1 801.208.4798
·
sensors@merit.com
·
www.MeritSensor.com
1600 W. Merit Parkway
·
South Jordan, Utah
·
84095
·
USA
(
P
psi
=
(
P
max
– P
min
•
P
counts
–
0.1
•
Max
0.8
•
Max
+ P
min
Where
P
psi
P
counts
P
Min
P
Max
Max
= Measured Pressure in PSI
= Pressure Counts from Merit Sensor Part
= Minimum Calibrated Pressure
= Maximum Calibrated Pressure
= 16384 = 14 Bit Resolution
1
2
3
4
1.9
2
3
4
10.2
SMT Landing Pad Layout
8.4
1
VDD
Typical .1µf
placed near
pins 1 and 4
SCL
8
7
6
Digital out
SSC
SDA
INT
4
REL
P
I
2
C PARAMETERS *
Parameter
SCL clock frequency
Start condition hold time relative to SCL edge
Minimum SCL clock low width
1
Minimum SCL clock high width
1
Start condition setup 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
1Combined low and high widths must equal or exceed minimum SCLK period.
ARY
IMIN
LP Series – Digital
Symbol
f
SCL
t
HDSTA
t
LOW
t
HIGH
t
SUSTA
t
HDDAT
t
SUDAT
t
SUSTO
t
BUS
Min
100
0.1
0.6
0.6
0.1
0.0
0.1
0.1
2
Typ
Max
400
Units
kHz
µs
µs
µs
µs
µs
µs
µs
µs
I
2
C TIMING DIAGRAM*
SDA
SDA
t
LOW
t
LOW
SCL
SCL
t
HDSTA
t
HDSTA
t
HDDAT
t
HDDAT
t
HIGH
t
HIGH
t
SUSTA
t
SUSTA
t
SUSTO
t
SUSTO
t
SUSDAT
t
SUSDAT
t
HDSTA
t
HDSTA
t
BUS
t
BUS
MERIT SENSOR 1420 I
2
C COMMUNICATION
Communications to the 1420 is read only. To read the pressure counts, the master performs a read request by asserting
a start condition, sending the 7 bit address of the part (If the part has an open address, 7 bits of anything is acceptable),
and sets the read/write bit. The master then waits for an acknowledgment. The acknowledgment is sent by the pressure
sensor along with 2 bits of status and bits 13:8 of the pressure counts, the master acknowledges the first 8 bits, and the
pressure sensor sends the remaining 8 bits of data. The Master then does not acknowledge and sends a stop condition
signaling the end of the transaction.
S
SLAVE
10
RW
A
SB SB
13
12
11
9
8
S \------------DEVICE ADDRESS-------------------/ 0
6
5
4
3
2
1
RW
A
SB SB\---------SENSOR DATA [13:8]----------/ 8
13
12
11
10
9
\------------DEVICE ADDRESS-------------------/
\---------SENSOR DATA [13:8]----------/
6
5
4
0
MASTER
3
MASTER
1
2
SLAVE
MASTER
MASTER
SLAVE
7
4
SLAVE
2
3
1
0
7
6
5
4
3
2
1
\----------------SENSOR DATA [7:0]------------------/ 0
6
5
\----------------SENSOR DATA [7:0]------------------/
A
MASTER
N
MASTER
ST
N
ST
A
S
S
Start Conditioning
Start Conditioning
#
A
#
A
Device Slave Address
Device Slave Address
Acknowledge Bit
Acknowledge Bit
Status Bits
Status Bits
#
#
Data Bit
Data Bit
RW Read/Write Bit
RW Read/Write Bit
ST Stop Condition
ST Stop Condition
N
N
SB
SB
Status Bits
Status0
Bits Normal Operation, Good Packet
0
Normal Operation, Good
0 0 1 0 Device in Command Mode Packet
No Acknowledge Bit
0 0 1 Stale Data Command Mode
Device in
No Acknowledge Bit
1
Stale Data
1 1 1 0 Diagnostic Condition Exsists
Diagnostic Condition Exsists
1
1
*Used by permission, ZMDI
REL
P
TRANSFER FUNCTION EXAMPLES
ARY
IMIN
LP Series – Digital
Example 1: 0.15 PSI Gage
Part: 1420-P15G-xx11-111
P
min
P
max
P
counts
0.16875
0.15
0.13125
0.1125
0.09375
Part: 1420-P15G-xx11-111
Calibrated Range (Pressure)
=0.0
PSI
=0.15
PSI
=7215
PSI
•
Max
=16384
0.075
0.05625
P
Psi
= .0638
Psi
Example 2: 1.0 PSI Gage
Part: 1420-1P0G-xx11-111
P
min
P
max
=0.0
PSI
=1.0
PSI
PSI
P
counts
=7215
Max
=16384
P
psi
=
(
P
max
– P
min
P
counts
–
0.1
•
Max
0.8
•
Max
P
Psi
= .4255
Psi
Example 3: -.5 to .5 PSI Differential
0.625
Part: 1420-P50D-xx11-111
P
min
P
max
= -0.5
PSI
= 0.5
PSI
PSI
P
counts
=8192
Max
=16384
•
0.8
•
16384
P
Psi
= 0.0
Psi
Sales
+1 801.208.4722
·
Customer Service
+1 801.208.4700
·
Fax
+1 801.208.4798
·
sensors@merit.com
·
www.MeritSensor.com
1600 W. Merit Parkway
·
South Jordan, Utah
·
84095
·
USA
(
((
P
Psi
=
(
0.5 –
(
–0.5
(
P
psi
=
(
P
max
– P
min
(
P
Psi
=
(
1 – 0.0
•
(
(
P
Psi
=
(
0.15 – 0.0
(
P
psi
=
(
P
max
– P
min
P
counts
–
0.1
•
Max
0.8
•
Max
7215
–
0.1
•
16384
0.8
•
16384
+
P
min
0.0375
0.01875
•
+
0
0
-0.01875
0
1638
3276
4914
6552
8190
9828
11466
13104
14742
16380
Counts
Part: 1420-1P0G-xx11-111
1.125
1
0.875
0.75
0.625
0.5
0.375
0.25
Calibrated Range (Pressure)
•
+
P
min
0.125
0
7215
–
0.1
•
16384
0.8
•
16384
+
0
-0.125
0
1638
3276
4914
6552
8190
9828
11466
13104
14742
16380
Counts
Part: 1420-P50D-xx11-111
Calibrated Range (Pressure)
0.5
0.375
0.25
0.125
0
-0.125
•
P
counts
–
0.1
•
Max
0.8
•
Max
8192– 0.1
•
16384
+
P
min
+
(
–0.5
-0.25
0.375
-0.5
-0.625
0
1638
3276
4914
6552
8190
9828
11466
13104
14742
16380
Counts
MCU
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