[D6F-PH]
Application Note No.MDMK-14-0386
Application Note 01
Usage of MEMS Differential Pressure Sensor
（D6F-PH）
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
1
[D6F-PH]
Application Note No.MDMK-14-0386
Contents
Outline ........................................................................................................................................3
Structure .....................................................................................................................................3
Dimensions.................................................................................................................................3
Principle of Pressure detection ..................................................................................................4
Features of Product ....................................................................................................................4
Usage .........................................................................................................................................5
6-1. Recommended tube connection method of D6F-PH......................................................... 5
6-2. Electrical connection method of D6F-PH........................................................................... 5
7 Specification of Communication .................................................................................................6
7-1. Outline of I2C Interface ...................................................................................................... 6
7-2. Interface Configuration Registers ...................................................................................... 7
7-2-1. Access Address Registers (00h – 01h) .......................................................................... 7
7-2-2. Serial Control Register (02h).......................................................................................... 7
7-2-3. Write Buffer Registers (03h – 06h)................................................................................. 8
7-2-4. Read Buffer Registers (07h – 0Ah) ................................................................................ 8
7-2-5. Example of I2C Access Commands............................................................................... 9
7-3. Description of Registers ...........................................................................................................10
7-3-1. Sensor Control (D040h) ............................................................................................... 10
7-3-2. Flags (D046h)............................................................................................................... 10
7-3-3. CRC Calculation Control ( D049h ) .............................................................................. 11
7-3-4. Data Registers (D051h-D068h).................................................................................... 12
8. Explanation of output data .......................................................................................................13
8-1. Data alignment ................................................................................................................. 13
8-2. Register content ............................................................................................................... 13
8-3. Example of Sensing data ................................................................................................. 14
9. Sensor Operation flow chart ....................................................................................................15
10. I2C Instruction for Sensor Operation .......................................................................................16
11. Sample Source Code ...............................................................................................................18
11-1.
D6F_PH_Sample.h ...................................................................................................... 18
11-2.
D6F_PH_Sample.c....................................................................................................... 19
12. WARRANTY AND LIMITED LIABILITY....................................................................................26
13. CONTACT ................................................................................................................................28
14. History ......................................................................................................................................28
1.
2.
3.
4.
5.
6.
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
2
[D6F-PH]
Application Note No.MDMK-14-0386
1. Outline
This application note is intended to demonstrate how to use and interface with Omron’s
MEMS differential pressure sensor(D6F-PH). It should be noted that this document is intended
to supplement the datasheet, which should be referenced when using the sensor.
2. Structure
Fig.1 shows the internal cross-section view of the MEMS differential pressure sensor
(D6F-PH). Air will flow from one inlet and out the other passing over the MEMS flow chip
surface. The MEMS chip is able to measure the airflow as air passes over the chip. For more
details on Omron’s MEMS Flow sensor chip, please see the application note（MDMK-13-0153）.
Flow Sensor chip
フローセンサチップ
基板
Substrate
Fig.1 the internal cross-section view of MEMS differential pressure sensor (D6F-PH)
3. Dimensions
High-pressure side
Low-pressure side
Fig.2 Outline dimensions of D6F-PH
Please refer to Section 6: Usage about bypass tube connection and electrical connection.
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
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[D6F-PH]
Application Note No.MDMK-14-0386
4. Principle of Pressure detection
By using a thermal mass flow sensor, Omron’s MEMS differential pressure sensor can detect
fine changes in differential pressure. For more detailed information, please refer to Application
Note（MDMK-13-0153）.
5. Features of Product
By using a thermal mass flow method, Omron’s MEMS differential pressure sensor is more
sensitive compared with that of a conventional(capacitive) differential pressure sensor in the
low-pressure range.
Vout vchip
Thermal mass flow method
The output of Omron’s sensor is
proportional to the square root of
the gas flow rate through the
sensor chip surface.
2
p vmain
Orange：thermal mass flow method
Blue：conventional method
Conventional method
The output of a conventional
sensor is proportional to the
square of the gas flow velocity
through the main channel.
Fig. 3 Comparison with conventional method and thermal mass flow method
Item
Range of Differential
Pressure
Resolution
Zero point accuracy （Note）
Span accuracy
（Note）
Span shift by Temperature
Table1. Specifications of D6F-PH□□□□
Description
Min
Typ
Max
Unit
-50
50
Pa
0
250
Pa
-500
500
Pa
12
bit
-0.2
+0.2
Pa
-3
+3
%R.D.
-0.5
+0.5
%R.D.
Response Time
Ambient Operating Temp
-20
33
-
50
80
msec
degC
Ambient Storage Temp
-40
-
80
degC
Ambient Operating Humidity
35
-
85
%RH
Ambient Storage Humidity
35
-
85
%RH
Note
D6F-PH0505AD3
D6F-PH0025AD1
D6F-PH5050AD3
With respect to a change of
10 degC
12bit Resolution
without freezing and
condensation
without freezing and
condensation
without freezing and
condensation
without freezing and
condensation
Supply Voltage
2.3
3.3
3.6
VDC
Current Consumption
6
mA
Vcc=3.3V、25degC
Frequency of SCL
400
kHz
FAST Mode
（Note）Span accuracy and zero point accuracy are the independence errors, and are not satisfied
at the same time.
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4
[D6F-PH]
Application Note No.MDMK-14-0386
6. Usage
6-1. Recommended tube connection method of D6F-PH
When connecting the D6F-PH sensor in a bypass configuration, the sensor is able to
detect fine pressure changes. This is achieved by providing an orifice in the main, which
generates a small pressure change before and after the orifice. The D6F-PH will be
connected to the bypass flow path from the pressure port which is provided before and after
the orifice.
High Pressure side
Bypass flow path
length is 800[mm] or less
Lower Pressure side
Main Chanel
Flow direction
of main channel
Orifice
Fig. 4 Recommended tube connection method of D6F-PH
Here, the inner diameter of the bypass tube which is connected to the D6F-PH is 4[mm]
and its length is 800[mm] or less.
6-2. Electrical connection method of D6F-PH
For the I2C output, the D6F-PH will require a pull-up resistor to each clock line(SCL) and
data line (SDA). A pull-up resistor of 2.2[kΩ] (recommended value) should be implemented
between the Vcc as shown in Fig.5. In addition, please adjust the pull-up resistor’s value
depending on the transfer rate of SCL and the I2C wire length.
Sensor
Fig. 5 Electrical connection method of D6F-PH
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[D6F-PH]
7
Application Note No.MDMK-14-0386
Specification of Communication
7-1. Outline of I2C Interface
Table2. Basic functions of I2C communication
Item
Communication method
SCL Frequency
Output format
Slave Address
Descriptions
I2C
Max 400kHz (Fast Mode)
Binary data (Upper byte, Lower byte)
1101100b or 0x6C
* Please note that the slave address is 7bits.
Interface Configuration Register
The memory and register access are controlled by writing to the interface configuration
registers.
Various internal registers
In case access to internal registers are needed, the target register’s address needs to be set
to the Interface Configuration Register (address:00h and 01h).
Table3. Interface Configuration Register
Signal
Conditioning
Digital
Processing
I2C
1.
2.
3.
4.
SDA
GND
Vcc
SCL
Register
A/D converter
Address
D040h
D046h
D049h
D051h
D052h
D061h
D062h
D065h
D066h
D067h
D068h
Configuration
Address
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Dh
Function
Access Address 1
Access Address 2
Serial Control
Write Buffer 0
Write Buffer 1
Write Buffer 2
Write Buffer 3
Read Buffer 0
Read Buffer 1
Read Buffer 2
Read Buffer 3
Initialize
Power sequence
Table4. Internal Register Map
Register name
Descriptions
SENS_CTRL
Sensor Control Register
FLAGS
Flag Register
INT_CTRL
CRC Calculation Control
COMP_DATA1_H
Compensated Flow rate Register
COMP_DATA1_L
TMP_H
Internal Temperature Register
TMP_L
REF_FLOW1_H
Sensor Reference Flow Register
REF_FLOW1_L
THRESH_FLOW1_H
Sensor Threshold Flow Register
THRESH_FLOW1_L
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[D6F-PH]
7-2.
Application Note No.MDMK-14-0386
Interface Configuration Registers
The memory and registers access are controlled by writing to the interface configuration
registers.
Table5. Interface Configuration Register Map
Configuration
Function
Note
Address
00h
Access Address 1 (Upper byte)
Upper byte of first Access Address
01h
Access Address 2 (Lower byte)
Lower byte of first Access Address
02h
Serial Control
Write / Read Access Control
03h
Write Buffer 0
Data to be written at Address
04h
Write Buffer 1
Data to be written at Address + 1
05h
Write Buffer 2
Data to be written at Address + 2
06h
Write Buffer 3
Data to be written at Address + 3
07h
Read Buffer 0
Data read from Address
08h
Read Buffer 1
Data read from Address + 1
09h
Read Buffer 2
Data read from Address + 2
0Ah
Read Buffer 3
Data read from Address + 3
0Bh
Initialize
0Dh
Power Sequence
Hardware reset control
Upper byte：bit[15:8] of 16bit data, Lower byte：bit[7:0] of 16bit data
7-2-1. Access Address Registers (00h – 01h)
The access address registers are used to access internal register blocks including sensor
register map, ADC register map, and internal memory. It specifies the data transfer start address
with auto increment for multiple byte data transfer.
Table6. Access Address Register
Address
MSB
D7
A15
A7
00h
01h
D6
A14
A6
D5
A13
A5
D4
A12
A4
D3
A11
A3
D2
A10
A2
D1
A9
A1
LSB
D0
A8
A0
7-2-2. Serial Control Register (02h)
Table7. Serial Control Register (02h)
The serial control register contains various bits to modify the behavior of the serial access.
Address
02h
•
MSB
D7
D_byte_
cnt[3]
D6
D_byte_
cnt[2]
D5
D_byte_
cnt[1]
D4
D_byte_
cnt[0]
D3
Req
D2
R_WZ
D1
Acc_ctl2
[1]
LSB
D0
Acc_ctl2
[0]
Acc_ctl2 [1：0] – Access Control bits
0 0 = 16bits address (A15-A0) access ( internal ROM and registers)
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[D6F-PH]
Application Note No.MDMK-14-0386
0 1 = 8bits address (A7-A0) access and used to access MCU internal 256 byte dual
port RAM.
1 0 = reserved
1 1 = reserved
7-2-3.
•
R_WZ – Read or Write access select bit
0 = Write Access
1 = Read Access
•
Req- Request bit
0 = the previous request is done
1 = new request. After the serial bus bridge controller finishes a request, it will clear
Req to 0. For write requests the bridge controller moves the data in write data
buffers to the location pointed by access address. For read requests the bridge
controller stores the read data into data buffer.
•
D_byte_cnt3 [3：0]
Transfer data byte count. It only supports 1, 2, 3, 4 data byte transfer.
Write Buffer Registers (03h – 06h)
There are four write data buffer registers at address: 03h – 06h. To perform a write, the host
can either use a single command or perform separate writes to the following addresses.
The host can write to sensor register map in single byte transfer:
The host can burst write data start from address = 00h with following data byte,
A[15:8]、A[7:0]、18h、data[0].
Or the host can do four serial bus writes and write one data byte into serial bus register with
the following steps.
・Write A[15:8] to address = 00h of interface configuration registers.
・Write A[7:0] to address = 01h of interface configuration registers.
・Write data[0] to address = 03h of interface configuration registers.
・Write 18h to address = 18h of interface configuration registers.(1byte, new request, write)
[Note] Read Serial Control register(02h). If Req = 0 (02h[3]), controller is finished with write.
7-2-4. Read Buffer Registers (07h – 0Ah)
There are four read data buffer registers at address: 07h – 0Ah. To perform a read, the host
can either use a single streaming command or perform separate commands to the following
addresses. After the read request is done by the internal serial bus bridge controller, the Req
bit is cleared to 0 and read data is stored in rd_buf1 – rd_buf4 (address = 07h – 0Ah).
For single byte read request the host can burst write A[15:8], A[7:0], 1Ch at start address =
00h. The host needs to read the command register until the Req bit is cleared to 0, then read
“read data buffer” for read data at address = 07h.
The host can perform a single byte read by individually programming the following registers.
・Write A[15:8] to address = 00h of interface configuration registers.
・Write A[7:0] to address = 01h of interface configuration registers.
・Write 1Ch to address = 02h of interface configuration registers.(1byte, new request, read)
[Note] Read address = 02h. If Req = 0 (02h[3]), controller is finished with read data[0] from
address = 07h.
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[D6F-PH]
Application Note No.MDMK-14-0386
7-2-5. Example of I2C Access Commands
I2C Command Examples
Start address of serial
configuration registers.
・I2C command：I2C write
Address to be set to 00h/01h
of serial configuration registers.
START
Slave Address
ACK
Access Address
ACK
Reg Address H
ACK
Reg Address L
ACK
S
D8h (6Ch (7b)+ 0)
A
00h
A
D0h
A
40h
A
Data to be set to 02h/03h
of serial configuration registers.
・I2C command：I2C read
Serial Ctrl
ACK
Write Data
ACK
STOP
18h
A
06h
A
P
Start address of serial configuration
registers (Read Buffer 0)
START
Slave Address
ACK
Access Address
ACK
S
D8h (6Ch (7b)+ 0)
A
07h
A
This data will be stored in serial
configuration register “07h” & “08h”
.(Read Buffer 0 / Read Buffer 1)
Re-Start
Slave Address
ACK
Read Data H
ACK
Read Data L
ACK
STOP
RS
D9h (6Ch (7b)+ 1)
A
xxh
A
xxh
NA
P
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[D6F-PH]
Application Note No.MDMK-14-0386
7-3. Description of Registers
The internal memory and registers of the sensor module can be accessed via the interface
configuration registers.
7-3-1. Sensor Control (D040h)
Table8. SENS_CTRL
Address
MSB
D7
LSB
D6
D5
D4
D3
D040h
D2
D1
D0
MS
DV_PWR[
1]
DV_PWR[
0]
Write
Access
None
None
None
None
None
Host &
MCU
Host &
MCU
Host &
MCU
Default
0
0
0
0
0
0
0
0
•
DV_PWR[1：0] – Main Device power mode setting
0 0 = Standby – All blocks are powered down.
1 0 = MCU on – Used when only MCU is required. Basic analog and memories are
powered on and MCU clock is running.
Note ：This register should not be changed during a measurement.
•
MS – MCU start – Begin execution of measurement or MCU mode based on the state of
DV_PWR.
•
•
7-3-2.
0 = Stop
Sequences are stopped and MCU clock is turned off.
1 = Start
The MCU clock is started and the MCU mode is executed.
Flags (D046h)
Table9. FLAGS
Address
MSB
D7
LSB
D6
D5
D4
D046h
Write
Access
None
None
None
D0
HV1
SV
None
Host &
MCU
None
Host &
MCU
Host &
MCU
0
0
0
0
0
0 = Supply voltage is within specification.
1 = Supply voltage is outside of specification.
HV1 – Heater Voltage Flag
•
•
•
D1
SV – Supply Voltage (VDD) Flag
•
•
•
D2
OS1
Default
•
D3
0 = Heater voltage is within specification.
1 = Heater voltage is outside of specification.
OS1 – Open Sensor Flag
•
•
0 = Sensor is connected.
1 = Sensor is not connected.
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[D6F-PH]
•
Application Note No.MDMK-14-0386
HV2 and OS2 are reserved bits. In case of write access, you should set to “0”.
* If you want to read flag register, it is recommended to read twice in order to avoid conflict with the
MCU update.
7-3-3.
CRC Calculation Control ( D049h )
Table 10. INT_CTRL
MSB
ADDR
D7
LSB
D6
D5
D4
D3
D2
D049h
D1
D0
CRC_EN
Write
Access
NONE
NONE
NONE
NONE
NONE
NONE
Host＆
MCU
NONE
Default
0
0
0
0
0
0
1
0
•
・
CRC_EN – CRC check calculation enable （See below for more information about the
CRC）
•
0 = CRC check calculation disable
•
1 = CRC check calculation enable
Description of the CRC calculation
CRC Overview
The CRC is used as an error detection method in a data communication. Our flow sensor
use the CRC8 polynomial x^8 + x^5 + x^4 + 1. The following is an example of I2C access 2
byte read using CRC function.
Fig 9. Example of 2byte read with CRC
・
1.
2.
3.
4.
・
Fig.6 Example of 2byte read with CRC
Bit unit CRC-8 calculation method
The data bit sequence will be aligned in a line.
The polynomial bit string will be aligned under the line of the data bit sequence.
If the data bit above the leftmost the polynomial bit sequence is 0, the polynomial bit
sequence is shifted one bit to the right. If the data bit above the leftmost polynomial bit
sequence is 1, the data bit and the polynomial bit are calculated by XOR. Then the
polynomial bit sequence are shifted one bit to the right.
1-3steps are repeated until the polynomial bit sequence reaches the right end of the data bit
sequence.
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[D6F-PH]
Application Note No.MDMK-14-0386
The following example shows how to calculate the CRC byte based on XOR calculation.
hex
1st Byte of data
04h
2nd Byte of data
02h
Polynomial (x^8+ x^5+ x^4+ 1) 131h
CRC-byte checksum
225h
bin
00000100
00000010
100110001
11100001
1st Byte of data
2nd Byte of data
0 0 0 0 0 1 0 0 0 0 0 0 0 0 1
1 0 0 1 1 0 0 0 1
0 0 0 1 1 0 0 0 1 1
1 0 0 1 1 0 0
0 1 0 1 1 1 1
1 0 0 1 1 0
0 0 1 0 0 1
1 0 0 1
0 0 0 0
Data bit sequence
0 0 0 0 0 0 0 0 0
0
0
0
0
0
1
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
0
0
1
1
0
1
1 0 0 0 0
1 0 0 0 1
0 0 0 0 1
Polynomial bit
bit sequence
sequence
Polynomial
Fig.7 XOR operation example of CRC-8
7-3-4.
Data Registers (D051h-D068h)
Table11. 16bit Data Register Map
MSB
LSB
Address
Registers Name
D051h
COMP_DATA1_H
DATA<15:8>
D052h
COMP_DATA1_L
DATA<7:0>
D061h
TMP_H
DATA<15:8>
D062h
TMP_L
DATA<7:0>
D7
D6
D5
D4
D3
D2
D1
Description
D0
Compensated Flow rate
Register
Internal Temperature
Register
For additional information, please refer to Section 8: Explanation of output data.
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[D6F-PH]
Application Note No.MDMK-14-0386
8. Explanation of output data
The measured data is sent to the dedicated registers. These registers contain, respectively,
upper byte and lower byte of the sensing signals of the sensor.
For example, the compensated flow data is given by the concatenation COMP_DATA1_H &
COMP_DATA1_L in unsigned 16bit number. And the raw flow data is given by the
concatenation UCFM1_H & UCFM1_L and it is expressed as a 2’s complement of signed
16bit number.
8-1.
Data alignment
Sensing data is represented as 16bit numbers. The data is split and sent in two consecutive
bytes to Flow Registers in “Big Endian” format.
“Big Endian” means that the upper byte of the number is stored in a register at the lowest
address, and the lower byte at the highest address.
8-2.
Register content
・COMP_DATA1_H & COMP_DATA1_L [D051h – D052h] : Compensated Data (unsigned)
These registers contain compensated flow rate data.
○ If pressure range is ±50[Pa] or ±500[Pa]
Dp[Pa] = (Pv - 1024)/60000*RANGE – RANGE/2 (RANGE = 100 or 1000)
Where、Pv is Register content stored in the Compensated Flow Data registers [D051h
– D052h].
○ If pressure range is 0-250[Pa]
Dp[Pa] = (Pv - 1024)/60000*RANGE ( RANGE = 250 )
Where、Pv is Register content stored in the Compensated Flow Data registers [D051h
– D052h].
・TMP_H & TMP_L [D061h – D062h] : Temperature data (signed)
The values stored in these registers represent the temperature data measured by the
internal temperature of the ASIC.
The following formula can be applied to convert register data into temperature value.
Tv [℃] = (Rv – 10214) / 37.39
Where, Tv is Converted temperature value in the degC format, and Rv is Register
content stored in the Temperature Data register.
Note: Temperature data is for reference ONLY. Its accuracy is not specified in the
device specifications.
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[D6F-PH]
8-3.
Application Note No.MDMK-14-0386
Example of Sensing data
The below tables provide a few basic examples of the data that is read in Flow Sensor
Registers when the device is subject to given flow and temperature. The values listed in the
tables are given under the hypothesis of perfect device calibration (i.e. no offset, no gain error,
etc).
Table12. Temperature Data registers content vs. Temperature value
Address of Registers
TMP_H
TMP_L
D061h
D062h
2Bh
8Dh
2Eh
FFh
26h
BBh
Value of Registers
HEX
2B8Dh
2EFFh
26BBh
DEC
11149
12031
9915
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Converted
Temperature values
25.0 degC
48.6 degC
-8.0 degC
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Application Note No.MDMK-14-0386
9. Sensor Operation flow chart
By calling the Initialize
function of the provided
sample code, No.1 routine
can be executed.
1. Initialization
Enable CRC Function*1
2. Execute MCU mode after desired
configurations are set
3. Reading the MSB and LSB of the
COMP_DATA Register (D051h and D052h)
By calling the Press_meas
function of provided sample
code, No.3 routine can be
executed.
In case of temperature
measurement, please call
Temp_meas function.
Hardware Reset Enable
*1 If you use CRC function, please send some command refer to Page.17.
Fig.8 Flowchart of Sensor operation
・Communication time
Item
Response time
Sampling interval
Master
Sign
α
β
Remarks
α ≧33 ms
β>α
In Press_meas,
4.Send
5.Send
In Press_meas,
4.Send
In Press_meas,
Command of data acquisition
Data acquisition
Command of data acquisition
β
α
Time
Slave
Start of data acquisition
COMP_DATA
Start of data acquisition
Fig.9 Time axis image view of the differential pressure measurement
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15
[D6F-PH]
Application Note No.MDMK-14-0386
10. I2C Instruction for Sensor Operation
1. Initialization after power up [Must be done]
I2C command: The device must be unlocked then write 0x00 to the EEPROM
Control Register(0xB) to load NVM trim values, but keep the MCU
in non-reset state.
START
Slave Address
ACK
Access Address
ACK
Write Data
ACK
STOP
S
D8h (6Ch (7b)+ 0)
A
0Bh
A
00h
A
P
2. Execute MCU mode after desired configuration registers
Writing 06h to the Sensor Control Register (D040h) will execute the MCU mode outlined
in Section 6 with the configured setting for the ADC Resolution and Gain, Compensation.
Reading the Sensor control register after writing a 06h will show the MUX selection
chosen by the MCU. After running the process, MS bit will be set to “0”.
[Caution]: Do not read or write to the Device while the MCU is executing. It would be
safe to read/write only after 33ms.
I2C command: Write 06h to the Sensor Control Register (D040h) (MS=1&MCU_on)
START
Slave Address
ACK
Access Address
ACK
Reg Address H
ACK
Reg Address L
ACK
S
D8h (6Ch (7b)+ 0)
A
00h
A
D0h
A
40h
A
Serial Ctrl
18h
ACK
A
Write Data
06h
ACK
A
STOP
P
3. Reading the Upper and Lower byte of Compensated Flow Data Registers(D051h & D052h)
I2C command: To read Compensated flow data register, it needs to set 2Ch (it
means 2byte read) to interface configuration register (address:2h).
START
Slave Address
ACK
Access Address
ACK
Reg Address H
ACK
Reg Address L
ACK
S
D8h (6Ch (7b)+ 0)
A
00h
A
D0h
A
51h
A
Serial Ctrl
ACK
STOP
2Ch
A
P
I2C command: Through Read Buffer 0(address:07h) and Read Buffer 1(address:08h),
you can read the 2byte of Compensated flow data.
START
Slave Address
ACK
Access Address
ACK
S
D8h (6Ch (7b)+ 0)
A
07h
A
Re-Start
Slave Address
ACK
Read Data H
ACK
Read Data L
ACK
STOP
RS
D9h (6Ch (7b)+ 1)
A
xxh
A
xxh
NA
P
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
16
[D6F-PH]
Application Note No.MDMK-14-0386
Enable CRC Function
1. Set to "1" to bit[1] of the CRC control register.
I2C command: Write 02h to the CRC Control Register (D049h).
START
Slave Address
ACK
Access Address
ACK
Reg Address H
ACK
Reg Address L
ACK
S
D8h (6Ch (7b)+ 0)
A
00h
A
D0h
A
49h
A
Serial Ctrl
ACK
Write Data
ACK
STOP
18h
A
02h
A
P
Execute Hardware Reset
1. Set to “1” to bit[7] of the Power Sequence register.
I2C command: Write 80h to the Power Sequence Register (0Dh).
START
Slave Address
ACK
Access Address
ACK
Write Data
ACK
STOP
S
D8h (6Ch (7b)+ 0)
A
0Dh
A
80h
A
P
The hardware reset after the execution, bit 7 is cleared to "0" automatically.
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
17
[D6F-PH]
Application Note No.MDMK-14-0386
11. Sample Source Code
The following is a sample source code of the D6F-PH control in the case of using
STM32microcontroller. The I2C control unit will need to be adjusted to whatever microcontroller is
used.
11-1.
D6F_PH_Sample.h
/*=================================================*/
/* D6F-PH Digital Flow Sensor Header File (using STM32)
* :Copyright: (C) OMRON Corporation, Microdevice H.Q.
* :Auther :
* :Revision: $Rev$
* :Id:
$Id$
* :Date:
$Date$
*
* All Rights Reserved
* OMRON Proprietary Right
*=================================================*/
/*=======================*/
/* for General
*/
/*=======================*/
#define SA_7
0x6C // for 7bit Slave Address
//#define RANGE_MODE 100 // Full Range +/-50[Pa]
Please change the RANGE_MODE
#define RANGE_MODE 250
// Full Range 0-250[Pa]
define for your target Product
//#define RANGE_MODE 1000 // Full Range +/-500[Pa]
Pressure range.
/*=======================*/
/* for Measure Mode
*/
/*=======================*/
#define P
1 // Pressure mode
#define T
2 // Temperature mode
/* Function prototypes -------------------------------------------------------*/
void Initialize( void );
short Press_meas( void );
short Temp_meas( void );
/* Private Functions --------------------------------------------------------*/
int I2C_WR(unsigned char add, char *dbuf, unsigned char n);
uint8_t I2C_RD_8(unsigned char add, char *dbuf, unsigned char n);
short I2C_RD_16(unsigned char add, char *dbuf, unsigned char n);
unsigned short I2C_RD_u16(unsigned char add, char *dbuf, unsigned char n);
void I2C1_Init(void);
void I2C1_Start(void);
void I2C1_MastrSel(uint8_t address, uint8_t rw);
void I2C1_AckEn(void);
void I2C1_AckDis(void);
void I2C1_Stop(void);
void I2C1_senddata(uint8_t data);
uint8_t I2C1_rcvdata(void);
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
18
[D6F-PH]
11-2.
Application Note No.MDMK-14-0386
D6F_PH_Sample.c
/*=================================================*/
/* D6F-PH Digital Flow Sensor Sample Code (using STM32)
* :Copyright: (C) OMRON Corporation, Microdevice H.Q.
* :Auther :
* :Revision: $Rev$
* :Id:
$Id$
* :Date:
$Date$
*
* All Rights Reserved
* OMRON Proprietary Right
*=================================================*/
#include "stm32f10x_i2c.h"
#include "D6F_PH_Sample.h"
#define
#define
#define
#define
I2C1_SCL_PIN
I2C1_SDA_PIN
I2C2_SCL_PIN
I2C2_SDA_PIN
GPIO_Pin_6
GPIO_Pin_7
GPIO_Pin_10
GPIO_Pin_11
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned long uint32;
short RD_FIFO; /* 16bit data width */
unsigned short uRD_FIFO; /* 16bit data width */
uint8_t RD_REG;
/* 8bit data width */
char setting_done_flag = 0;
// Dummy wait routine
void adc_wait(volatile unsigned long delay)
{
while(delay) delay--;
}
/*=================================================*/
/* Initialize Function
*/
/* Usage
: Initialize( void )
*/
/* Argument
: Null
*/
/* Return value : T.B.D
*/
/*=================================================*/
void Initialize( void )
{
/* EEPROM Control <= 00h */
char send1[] = {0x0B, 0x00};
Copyright
2013 - 2015
OMRON
I2C_WR(SA_7,
send1,
2); Corporation. All Rights Reserved.
/* [D042] <= 0C35h 50msec wait@4MHz */
char send2[] = {0x00, 0xD0, 0x42, 0x28, 0x0C, 0x35};
I2C_WR(SA_7, send2, 6);
19
[D6F-PH]
Application Note No.MDMK-14-0386
char send1[] = {0x0B, 0x00};
I2C_WR(SA_7, send1, 2);
}
/*=======================================================*/
/* Pressure measure Function
*/
/* Usage
: Press_meas( void )
*/
/* Argument
: NULL
*/
/* Return value : Compensated Pressure value(unsigned) */
/*=======================================================*/
short Press_meas(void)
{
short rd_fifo;
short rd_flow;
unsigned long wait_time;
/* [D040] <= 06h */
char send2[] = {0x00, 0xD0, 0x40, 0x18, 0x06};
I2C_WR(SA_7, send2, 5);
wait_time = 33; /*33msec wait */
/* wait time depend on resolution mode */
adc_wait(wait_time);
/* [D051/D052] => Read Compensated Flow value */
char send3[] = {0x00, 0xD0, 0x51, 0x2C, 0x07};
uRD_FIFO = I2C_RD_u16(SA_7, send3, 5);
// Press Mode : [Pa] = (xx[count] - 1024) * Full Range [Pa]/ 60000 - Full Range [Pa] at
other
if (RANGE_MODE == 250) {
rd_flow = ((rd_fifo - 1024) * RANGE_MODE *10/ 60000); /* convert to [Pa] */
}
else {
rd_flow = ((rd_fifo - 1024) * RANGE_MODE *10/ 60000) - RANGE_MODE*10/2; /* convert
to [Pa] */
}
return rd_flow;
}
/*=======================================================*/
/* Temperature measure Function
*/
/* Usage
: Temp_meas()
*/
/* Argument
: NULL
*/
/* Return value : x10 Temperature
*/
/*=======================================================*/
short
Temp_meas(void)
Copyright
2013 - 2015 OMRON Corporation. All Rights Reserved.
{
short
rd_temp;
unsigned long wait_time;
/* [D040] <= 06h */
20
[D6F-PH]
Application Note No.MDMK-14-0386
short Temp_meas(void)
{
short
rd_temp;
unsigned long wait_time;
/* [D040] <= 06h */
char send2[] = {0x00, 0xD0, 0x40, 0x18, 0x06};
I2C_WR(SA_7, send2, 5);
/* wait time depend on resolution mode */
wait_time = 33; /* 33msec wait */
adc_wait(wait_time);
/* [D061/D062] => Read TMP_H/TMP_L value */
char send3[] = {0x00, 0xD0, 0x61, 0x2C, 0x07};
RD_FIFO = I2C_RD_16 (SA_7, send3, 5);
rd_temp = ((RD_FIFO -10214)*1000 / 3739); // convert to degree-C(x10)
return rd_temp;
}
/* Public Basic Functions ----------------------------------------------------------*/
/*=================================================*/
/* I2C Write command
*/
/* Usage
: I2C1_WR()
*/
/* Argument
: 7bit Slave Address(char)
*/
/*
/* Return value : 8bit Read result
*/
/*=================================================*/
int I2C_WR(unsigned char add, char *dbuf, unsigned char n) {
int i = 0;
I2C1_Start();
I2C1_MastrSel(add, 0);
while (n--) {
I2C1_senddata(dbuf[i]);
i++;
}
I2C1_Stop();
return 0;
/* Start condition */
/* Slave Address
*/
/* Send Data
*/
/* Stop condition */
}
/*=================================================*/
/* I2C Read command
*/
/* Usage
: I2C_RD()
*/
/* Argument
: char add (7bit Slave Address)
*/
/*
char *dbuf (Write data)
*/
/*
unsigned char n (Number of bytes)*/
/*
Return 2013
value- 2015
: 8bit
Read Corporation.
result
*/
Copyright
OMRON
All Rights Reserved.
/*=================================================*/
uint8_t I2C_RD_8 (unsigned char add, char *dbuf, unsigned char n) {
int i= 0;
char n_w;
21
[D6F-PH]
Application Note No.MDMK-14-0386
/*
unsigned char n (Number of bytes)*/
/* Return value : 8bit Read result
*/
/*=================================================*/
uint8_t I2C_RD_8 (unsigned char add, char *dbuf, unsigned char n) {
int i= 0;
char n_w;
n_w = n - 1;
/* I2C Pre-WR Access */
I2C1_Start();
I2C1_MastrSel(add, 0);
while (n_w--) {
I2C1_senddata(dbuf[i]);
i++;
}
I2C1_Stop();
/* I2C RD Access */
I2C1_Start();
I2C1_MastrSel(add, 0);
I2C1_senddata(dbuf[n-1]);
I2C1_Start();
I2C1_MastrSel(add, 1);
I2C1_AckDis();
I2C1_Stop();
RD_REG = I2C1_rcvdata();
return RD_REG;
/* Start condition */
/* Slave Address 7bit => 8bit */
/* Send Data
*/
/* Stop condition */
/*
/*
/*
/*
/*
/*
/*
/*
Start condition */
Slave Address 7bit => 8bit */
Word Address
*/
Re-Start condition */
Slave 7bit => 8bit for RD */
ack diable for 1 byte */
Stop condition send */
Read Data */
}
/*=================================================*/
/* I2C Read command
*/
/* Usage
: I2C_RD_16()
*/
/* Argument
: char add (7bit Slave Address)
*/
/*
char *dbuf (Write data)
*/
/*
unsigned char n (Number of bytes)*/
/* Return value : 16bit Read result
*/
/*=================================================*/
short I2C_RD_16 (unsigned char add, char *dbuf, unsigned char n) {
int i= 0;
char n_w;
uint8_t rd_fifo[2] = {0, 0};
n_w = n - 1;
/* I2C Pre-WR Access */
I2C1_Start();
/* Start condition */
I2C1_MastrSel(add, 0);
/* Slave Address 7bit => 8bit */
while (n_w--) {
I2C1_senddata(dbuf[i]);
/* Send Data
*/
i++; 2013 - 2015 OMRON Corporation. All Rights Reserved.
Copyright
}
I2C1_Stop();
/* Stop condition */
adc_wait(5); /* 5msec wait */
22
[D6F-PH]
Application Note No.MDMK-14-0386
i++;
}
I2C1_Stop();
/* Stop condition */
adc_wait(5); /* 5msec wait */
I2C1_Start();
I2C1_MastrSel(add, 0);
I2C1_senddata(dbuf[n-1]);
I2C1_Start();
I2C1_MastrSel(add, 1);
I2C1_AckEn();
rd_fifo[0] = I2C1_rcvdata();
I2C1_AckDis();
I2C1_Stop();
rd_fifo[1] = I2C1_rcvdata();
RD_FIFO = ((rd_fifo[0] << 8)
return RD_FIFO;
/* Start condition */
/* Slave Address 7bit => 8bit */
/* Word Address
*/
/* Re-Start condition */
/* Slave 7bit => 8bit for RD */
/* ack enable send after MSB 1 byte read */
/* Read Data */
/* ack diable send after LSB 1 byte read */
/* Stop condition send */
/* Read Data */
| rd_fifo[1]);
}
/*=================================================*/
/* I2C Read command
*/
/* Usage
: I2C_RD_u16()
*/
/* Argument
: char add (7bit Slave Address)
*/
/*
char *dbuf (Write data)
*/
/*
unsigned char n (Number of bytes)*/
/* Return value : 16bit Read result
*/
/*=================================================*/
unsigned short I2C_RD_u16 (unsigned char add, char *dbuf, unsigned char n) {
int i= 0;
char n_w;
uint8_t rd_fifo[2] = {0, 0};
n_w = n - 1;
/* I2C Pre-WR Access */
I2C1_Start();
I2C1_MastrSel(add, 0);
while (n_w--) {
I2C1_senddata(dbuf[i]);
i++;
}
I2C1_Stop();
/* Start condition */
/* Slave Address 7bit => 8bit */
/* Send Data
*/
/* Stop condition */
adc_wait(5); /* 5msec wait */
I2C1_Start();
/* Start condition */
I2C1_MastrSel(add, 0);
/* Slave Address 7bit => 8bit */
I2C1_senddata(dbuf[n-1]);
/* Word Address
*/
I2C1_Start();
/* Re-Start
condition
*/
Copyright
2013 - 2015 OMRON Corporation.
All Rights
Reserved.
I2C1_MastrSel(add, 1);
/* Slave 7bit => 8bit for RD */
I2C1_AckEn();
/* ack enable send after MSB 1 byte read */
rd_fifo[0] = I2C1_rcvdata(); /* Read Data */
I2C1_AckDis();
/* ack diable send after LSB 1 byte read */
I2C1_Stop();
/* Stop condition send */
23
[D6F-PH]
I2C1_Start();
/*
I2C1_MastrSel(add, 1);
/*
I2C1_AckEn();
/*
rd_fifo[0] = I2C1_rcvdata(); /*
I2C1_AckDis();
/*
I2C1_Stop();
/*
rd_fifo[1] = I2C1_rcvdata(); /*
uRD_FIFO = ((rd_fifo[0] << 8) |
return uRD_FIFO;
Application Note No.MDMK-14-0386
Re-Start condition */
Slave 7bit => 8bit for RD */
ack enable send after MSB 1 byte read */
Read Data */
ack diable send after LSB 1 byte read */
Stop condition send */
Read Data */
rd_fifo[1]);
}
void I2C1_Init(){
I2C_InitTypeDef I2C1_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// start clock of
I2C
I2C1_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C1_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C1_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C1_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C1_InitStructure.I2C_ClockSpeed = 400000;
GPIO_InitTypeDef GPIO_InitStructure;
// make instance of
InitStructure
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
// start clock of GPIO
pins
GPIO_InitStructure.GPIO_Pin =( I2C1_SCL_PIN | I2C1_SDA_PIN );
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_DeInit(I2C1);
I2C_Init(I2C1, &I2C1_InitStructure); // Initialize with above parameters
I2C_Cmd(I2C1, ENABLE);
}
void I2C1_Start(){
I2C_GenerateSTART(I2C1,ENABLE); // issue start condition
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_MODE_SELECT));
}
void I2C1_MastrSel( uint8_t address, uint8_t RW){
uint8_t direct;
uint32_t event;
direct =(RW == 0)?I2C_Direction_Transmitter : I2C_Direction_Receiver;
event
=(RW
==
0)?I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED
I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED;
I2C_Send7bitAddress(I2C1,(address
<<All
1),direct
); //write to Slave
Copyright
2013 - 2015 OMRON Corporation.
Rights Reserved.
while(!I2C_CheckEvent(I2C1, event)); // wait ACK
}
void I2C1_senddata(uint8_t data){
I2C_SendData(I2C1, data);
:
24
//受信コマンドを発信す
[D6F-PH]
Application Note No.MDMK-14-0386
I2C_Send7bitAddress(I2C1,(address << 1),direct ); //write to Slave
while(!I2C_CheckEvent(I2C1, event)); // wait ACK
}
void I2C1_senddata(uint8_t data){
I2C_SendData(I2C1, data);
//transmit the received
command
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_TRANSMITTED)); // wait ACK
}
uint8_t I2C1_rcvdata(void){
while(!I2C_CheckEvent(I2C1,I2C_EVENT_MASTER_BYTE_RECEIVED)); // wait ACK
return I2C_ReceiveData(I2C1); // receive 4th 8bit data
}
void I2C1_Stop(){
I2C_GenerateSTOP(I2C1, ENABLE);
}
// put stop condition
void I2C1_AckEn(){
I2C_AcknowledgeConfig(I2C1, ENABLE);
}
// ack enable
void I2C1_AckDis(){
I2C_AcknowledgeConfig(I2C1, DISABLE); // ack disable
}
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
25
[D6F-PH]
Application Note No.MDMK-14-0386
12. WARRANTY AND LIMITED LIABILITY
Thank you for your usage of products of Omron Corporation (“Omron”). Without any special
agreements, this Terms and Conditions shall apply to all transactions regardless of who sells.
Place an order, accepting this Terms and Conditions.
1. DEFINITIONS
The following terms used herein have following meaning.
(1) Omron Products; Electronic components sold by Omron
(2) Catalogues; Any and all catalogues (including the Components Catalogue), specifications,
instructions and manuals relating to Omron Products, including electronically provided data.
(3) Conditions; Use conditions, rating, performance, operating environment, handling procedure,
precautions and/or prohibited use of Omron Products described in the Catalogues.
(4) User Application(s); Application of Omron Products by a customer, including but not limited
to embedding Omron Products into customer’s components, electronic circuit boards,
devices, equipments or systems
(5) Fitness; (a)performance, (b) no infringement of intellectual property of third party, (c)
compliance with laws and regulations and (d)conformity to various standards by Omron
Products in User Applications.
2. NOTE ABOUT DESCRIPTIONS
Please understand following as to contents of the Catalogues.
(1) Rating and performance is tested separately. Combined conditions are not warranted.
(2) Reference data is intended to be used just for reference. Omron does NOT warrant that the
Omron Product can work properly in the range of reference data.
(3) Examples are intended for reference. Omron does not warrant the Fitness in usage of the
examples.
(4) Omron may discontinue Omron Products or change specifications of them because of
improvements or other reasons.
3. NOTE ABOUT USE
Please understand followings as to your adoption and use of Omron Products
(1) Please use the product in conformance to the Conditions, including rating and performance.
(2) Please confirm the Fitness and decide whether or not Omron Products are able to be
adopted in the User Application.
(3) Omron will not warrant any items in 1.(5) (a) to (d) of User Application nor the Fitness.
(4) If you use Omron Products in the application below, please ensure followings; (i) allowance
in aspect of rating and performance, (ii) safety design which can minimize danger of the
Application when the product does not work properly and (iii) periodical maintenance of the
product and the Application.
(a) Applications requiring safety, including, without limitation, nuclear control facilities,
combustion facilities, aerospace and aviation facilities, railroad facilities, elevating
facilities, amusement facilities, medical facilities, safety devices or other applications
which has possibility to influence lives or bodies
(b) Applications requiring high reliability, including, without limitation, supplying systems of
gas, water and electric power and applications handling right, title, ownership or property,
such as payment systems
(c) Applications in a harsh condition or environment, including, without limitation, outdoor
facilities, facilities with potential of chemical contamination or electromagnetic interference,
facilities with vibration or impact and facilities on continual operation for a long period
(d) Applications under conditions or environment which are not described in this specification
(5) Omron Products shown in this catalogue are not intended to be used in automotive
applications (including two wheel vehicles). Please DO NOT use the Omron Products in the
automotive application.
(6)THE PRODUCTS CONTAINED IN THIS CATALOG ARE NOT SAFETY RATED. THEY
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
26
[D6F-PH]
Application Note No.MDMK-14-0386
ARE NOT DESIGNED OR RATED FOR ENSURING SAFETY OF PERSONS, AND
SHOULD NOT BE RELIED UPON AS A SAFETY COMPONENT OR PROTECTIVE DEVICE
FOR SUCH PURPOSES. Please refer to separate catalogs for OMRON's safety rated
products.
4. WARRANTY
Warranty of Omron Products is subject to followings.
(1) Warranty Period; One year after your purchase
(2) Warranty; Omron will provide, free of charge, replacements of the same number of
malfunctioning products
(3) Exceptions; This warranty does not cover malfunctions caused by any of the following.
(a) Usage in the manner other than its original purpose
(b) Usage out of the Conditions
(c) Cause which could not be foreseen by the level of science and technology at the time of
shipment of the product
(d) Cause outside Omron or Omron Products, including force majeure such as disasters
5. LIMITATION ON LIABILITY
THE WARRANTY DESCRIBED IN THIS “TERMS AND CONDITIONS” IS A WHOLE AND
SOLE LIABILITY FOR OMRON PRODUCTS. THERE ARE NO OTHER WARRANTIES,
EXPRESSED OR IMPLIED. OMRON AND DISTRIBUTORS ARE NOT LIABLE FOR ANY
DAMAGES ARISEN FROM OR RELATING TO OMRON PRODUCTS.
6. PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any
consequence thereof.
7. EXPORT CONTROLS
Buyer shall comply with all applicable laws and regulations of Japan and/or other related
countries at the time of export or provision to non-citizens of Omron Products or their technical
information.
EC200E
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
27
[D6F-PH]
Application Note No.MDMK-14-0386
13. CONTACT
OMRON Electronic Components Web
http://www.omron.com/ecb/index.html
Contact Us
For further inquiry such as delivery, price, sample and/or specification, please contact your
local agency or Omron sales representative.
Global Sales Office
http://www.omron.com/ecb/service/network.html
Mail Contact
http://www.omron.com/ecb/contact/index.html
Phone
Micro Devices H.Q. Tel: (81) 77-588-9200
686-1 Ichimiyake, Yasu, Shiga, 520-2362 JAPAN
Place an order, accepting this Terms and Conditions.
http://www.omron.com/ecb/products/order/index.html
14. History
Revision
Rev 1.0
Rev 2.0
DATE
Oct 1,2013
Mar 27, 2014
Rev 3.0
Aug 07, 2015
Note
New Released
At table3 & table5 of section7, add expression of the initialize
register.
At I2C command example of section10, add the ACK to
Initialization after power up.
Add CRC Calculation and Hardware reset.
Section7(7.3.3),9(Fig.8),10(P17)
Copyright 2013 - 2015 OMRON Corporation. All Rights Reserved.
28