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Atlas Scientific EZO-pH, Руководство пользователя

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This schematic shows exactly how we isolate data and power using the 

ADM3260

 

and a few passive components. The ADM3260 can output isolated power up to 150 mW 
and incorporates two bidirectional data channels.  

This technology works by using tiny transformers to induce the voltage across an air gap. 
PCB layout requires special attention for EMI/EMC and RF Control, having proper ground 
planes and keeping the capacitors as close to the chip as possible are crucial for proper 
performance. The two data channels have a 4.7k

Ω

 pull up resistor on both the isolated 

and non-isolated lines (R1, R2, R3, and R4) The output voltage is set using a voltage 
divider (R5, R6, and R,7) this produces a voltage of 3.9V regardless of your input voltage.

Isolated ground is different from non-isolated ground, these two lines should not 

be connected together.

r 0.2

C4

10uF

C1

0.1uf

VDDP

ADM3260

HDR_BTM

ISO-VCC

ISO-VCC

ISO-VCC

ISO-VCC

ISO-VCC

R5

R7

R4

R3

1.5K

R6

1.5K

C3

C2

C6

C5

10uF

10uF

0.1uF

0.1uF

1.5K

4.7K

4.7K

VDDISO

VISO

VSEL

NC

NC

SCL1

SDA1

SCL2

SDA2

VIN

GNDP

GNDISO
GNDISO
GNDISO
GNDISO

GNDP
GNDP
GNDP

PDIS

VCC

VCC

VCC

VCC

VCC

VCC

RX/SCL

TX/SDA

NC

GND

ISO-GND

ISO-GND

GND

R2

R1

4.7K

4.7K

R5

1M

HDR_TOP

VCC

RX/SCL

TX/SDA

EN

GND

Non-isolated

N-FET

VCC = 3.0v − 5.5v

Isolated

D

G

S

GND

VCC

R8

1M

10

Copyright © Atlas Scientific LLC

Содержание EZO-pH

Страница 1: ...ressure 1 meter Cable length No Internal temperature sensor 1 Year Time before recalibration 2 5 Years Life expectancy N A Maintenance Silver silver chloride Reads pH 0 0001 Resolution 1 99 C Temperat...

Страница 2: ...ft 1 meter 49 grams 95 in 1 second pH 7 00 0 mV 12mm x 150mm 0 5 x 6 Yes Chemical only Yes Standard lab use Field use Soil Low ionic and ultra pure water High pH solutions up to 14 pH Samples containi...

Страница 3: ...to the outer layer of the glass while larger ions remain in the solution The difference in the concentration of hydrogen ions outside the probe vs inside the probe creates a VERY small current This cu...

Страница 4: ...ectors and cables The current that is generated from the hydrogen ion activity is the reciprocal of that activity and can be predicted using this equation Because a pH probe is a passive device it can...

Страница 5: ...10 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J NEVER EXTEND THE CABLE WITH CHEAP JUMPER WIRES DO NOT CUT THE PROBE CABLE WITHOUT REFERING TO THIS DOCUMENT 5 Copyright Atlas Scientific...

Страница 6: ...1 5 10 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J DO NOT MAKE YOUR OWN UNSHIELDED CABLES ONLY USE SHIELDED CABLES REFER TO THIS DOCUMENT 6 Copyright Atlas Scientific LLC...

Страница 7: ...e recommend that you use proper isolation such as the Basic EZO TM Inline Voltage Isolator or Tentacle Shield Be sure to calibrate your probe with the extended cable Extending a probe cable can be eas...

Страница 8: ...bottle by turning it counter clockwise and pulling the probe out Slide the O ring and the cap off the probe pH probes must stay wet and cannot be allowed to dry out this is why every pH probe is shipp...

Страница 9: ...n slope The type of coating will determine the cleaning technique Soft coatings can be removed by vigorous stirring or by the use of a squirt bottle Organic chemical or hard coatings should be chemica...

Страница 10: ...l only need to recalibrate your probe once per year for the first two years After that every six months If you are using the pH probe in batch chemical manufacturing industrial process or in a solutio...

Страница 11: ...ation UART I2 C Data protocol 99 0x63 Default I2 C address 3 3V 5V Operating voltage ASCII Data format Yes Temp compensation Reads pH 001 Resolution EZO pH Embedded pH Circuit V 5 1 Revised 10 23 18 T...

Страница 12: ...can be soldered at any time Once that decision has been made Atlas Scientific no longer assumes responsibility for the device s continued operation The embedded systems engineer is now the responsibl...

Страница 13: ...mation Response codes Reading device status Sleep mode low power Change baud rate Protocol lock Factory reset Change to I2 C mode Manual switching to I2 C I2 C mode Sending commands Requesting data Re...

Страница 14: ...3 3 mA 13 3 mA ON OFF OFF 5V 3 3V Absolute max ratings MIN MAX TYP Parameter 65 C 125 C 85 C 25 C 40 C Storage temperature EZO pH VCC Operational temperature EZO pH 5V 5 5V 3 3V EZO TM circuit dimensi...

Страница 15: ...EZO TM circuit identification Viewing correct datasheet Viewing incorrect datasheet EZO pH circuit Legacy pH circuit Click here to view legacy datasheet r 0 1 5 0 5 0 5 Copyright Atlas Scientific LLC...

Страница 16: ...to the outer layer of the glass while larger ions remain in the solution The difference in the concentration of hydrogen ions outside the probe vs inside the probe creates a VERY small current This cu...

Страница 17: ...nd Cal mid n Where n is any floating point value that represents the calibration midpoint 5 Do not pour the calibration solution back into the bottle 1 5 10 15 20 25 30 1 5 10 15 20 25 30 A B C D E F...

Страница 18: ...unt of the calibration solution into a cup 3 Let the probe sit in calibration solution until readings stabilize 1 2 minutes 4 Calibrate the highpoint value using the command Cal high n Where n is any...

Страница 19: ...idly fluctuating readings or readings that are consistently off To verify that electrical noise is causing inaccurate readings place the pH probe in a cup of water by itself The readings should stabil...

Страница 20: ...ated and non isolated lines R1 R2 R3 and R4 The output voltage is set using a voltage divider R5 R6 and R 7 this produces a voltage of 3 9V regardless of your input voltage Isolated ground is differen...

Страница 21: ...0 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J 1 5 10 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J TM Atlas Scientific PWR RX TX Only after you are familar with EZOTM circu...

Страница 22: ...10 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J NEVER EXTEND THE CABLE WITH CHEAP JUMPER WIRES DO NOT CUT THE PROBE CABLE WITHOUT REFERING TO THIS DOCUMENT 12 Copyright Atlas Scientific...

Страница 23: ...1 5 10 15 20 1 5 15 15 20 A B C D E F G H I J A B C D E F G H I J DO NOT MAKE YOUR OWN UNSHIELDED CABLES ONLY USE SHIELDED CABLES REFER TO THIS DOCUMENT 13 Copyright Atlas Scientific LLC...

Страница 24: ...SPI Analog RS 485 Mod Bus 4 20mA Available data protocols Unavailable data protocols Default r 0 1 14 Copyright Atlas Scientific LLC...

Страница 25: ...cut Baud rate Calibration Continuous mode Device name Enable disable response codes Hardware switch to I2 C mode LED control Protocol lock Software switch to I2 C mode Find Sleep mode Temperature comp...

Страница 26: ...ntrol 300 1 200 2 400 9 600 19 200 38 400 57 600 115 200 default 0V 0V VCC CPU TX RX RX TX TX RX Data type floating point Decimal places 3 Smallest string 4 characters Largest string 40 characters Rea...

Страница 27: ...Default state Mode UART 9 600 Baud 1 000 ms Green Standby Cyan Taking reading Transmitting continuous 1 reading per second on Readings Speed LED 17 Copyright Atlas Scientific LLC...

Страница 28: ...return cr Hex Dec ASCII 39 57 9 5 35 53 CPU TX RX SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL 9 560 cr 9 600 baud default Receiver Advanced ASCII data string Command Sender 0D 13 cr r 0 1...

Страница 29: ...r Sending commands to device CPU TX RX Short Short Sender Sleep cr Command not case sensitive ASCII data string Receiver Hex Dec ASCII 53 83 S l e e p 6C 108 101 101 112 65 65 70 0D 13 Advanced cr r 0...

Страница 30: ...Green UART standby Cyan Taking reading Purple Changing baud rate Red Command not understood White Find LED color definition r 0 1 LED ON 5V 3 3V 2 2 mA 0 6 mA 20 Copyright Atlas Scientific LLC...

Страница 31: ...isable protocol lock finds device with blinking white LED change to I2 C mode change baud rate performs calibration enabled enabled n a not set n a enable enable 25 C n a n a disabled n a not set 9 60...

Страница 32: ...1 or L 0 OK LED control L 1 cr cr cr LED on L 0 LED off L LED state on off Command syntax default cr cr cr cr OK cr OK L 1 L 1 L 0 L 0 L Example Response cr r 0 1 cr cr 22 Copyright Atlas Scientific L...

Страница 33: ...X RX SCL SDA TX RX SCL Find Find cr LED rapidly blinks white used to help find device Command syntax cr cr OK Find Example Response r 0 1 This command will disable continuous mode Send any character o...

Страница 34: ...inuous readings C continuous reading mode on off default Command syntax C 1 C 30 C 0 OK pH 1 sec pH 2 sec pH n sec OK pH 30 sec pH 60 sec pH 90 sec cr cr cr cr cr cr cr cr Example Response cr cr C 1 o...

Страница 35: ...Single reading mode 1 000 ms Green Standby Cyan Taking reading Transmitting R cr cr takes single reading Command syntax R 9 560 OK cr cr Example Response 800 ms r 0 1 25 Copyright Atlas Scientific LLC...

Страница 36: ...r OK Cal mid 7 00 Cal low 4 00 Cal high 10 00 cr Cal clear Example Response cr Cal Cal 0 or Cal 1 or Cal 2 or Cal 3 OK cr cr cr cr cr two point one point three point cr cr cr cr cr Cal mid n Cal low n...

Страница 37: ...6F 6C 20 67 75 79 DONE cr Import 59 6F 75 20 61 72 cr Export cr Export cr Export cr Export 10 120 Disabling OK simplifies this process Export Example Response Export Use this command to save calibrat...

Страница 38: ...sely the slope of the acid calibration line matched the ideal pH probe 100 3 is how closely the slope of the base calibration matches the ideal pH probe 99 7 100 3 Response breakdown After calibrating...

Страница 39: ...mpensation and take a reading Command syntax cr cr cr cr OK cr OK cr 8 91 T 19 5 RT 19 5 T Example Response T 19 5 OK cr cr 8 82 T 19 5 cr 8 91 This is a new command for firmware V2 12 r 0 2 Default t...

Страница 40: ...and syntax cr cr cr OK Name zzt Name Example Response _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 6 2 7 3 8 4 9 5 10 11 12 13 14 15 16 n Up to 16 ASCII characters Name zzt OK cr cr OK OK cr cr Name Name zzt Nam...

Страница 41: ...Device information Response breakdown i Device pH Firmware 1 98 i cr cr device information Command syntax i Example Response i pH 1 98 OK cr cr r 0 1 31 Copyright Atlas Scientific LLC...

Страница 42: ...cannot be disabled under volt VCC 3 1V reset boot up complete ready entering sleep mode wake up OV UV RS RE SL WA 9 560 OK 9 560 OK 1 cr cr cr enable response OK 0 disable response OK response on off...

Страница 43: ...brown out watchdog unknown S B W U Status Reason for restart P Voltage at Vcc 5 038 Response breakdown Status cr Command syntax Example Response Status P 5 038 OK cr cr voltage at Vcc pin and reason f...

Страница 44: ...aken device Sleep cr Sleep cr Command syntax Example Response SL WA wakes up device enter sleep mode low power Sleep Any command cr cr Sleep 1 16 mA Standby 16 mA r 0 1 STANDBY SLEEP 16 mA 1 16 mA 0 9...

Страница 45: ...dby Cyan Taking reading Purple Changing baud rate Red Command not understood White Find OK cr reboot Baud n cr Command syntax change baud rate n Example Response OK Baud 38400 Baud cr cr cr Baud 38400...

Страница 46: ...ud rate Red Command not understood White Find OK cr ER cr Short Short cannot change to I2 C OK OK Plock 1 Plock 0 or Plock 1 cr cr cr enable Plock Plock 0 disable Plock Plock Plock on off Command synt...

Страница 47: ...ration LED on OK enabled 1 000 ms Factory cr RS cr OK cr RE cr 1 000 ms reboot Factory cr Command syntax Example Response OK enable factory reset Factory cr cr Baud rate will not change r 0 1 37 Copyr...

Страница 48: ...ing reading Pur Chan baud OK cr now in I2 C mode Green Blue I2C n cr Command syntax Example Wrong example Response Response OK reboot in I2 C mode ER n 127 sets I2 C address and reboots into I2 C mode...

Страница 49: ...D Confirm RX is disconnected Connect ground power on Wait for LED to change from Green to Blue Disconnect ground power off Reconnect all data and power CPU TX RX Short Short Wrong Example Example Disc...

Страница 50: ...nge I2 C address Hardware switch to UART mode LED control Protocol lock Software switch to UART mode Find Sleep mode Temperature compensation Settings that are NOT retained if power is cut Settings th...

Страница 51: ...sistor may be needed 0V 0V VCC CPU SCL SDA SCL SDA VCC VCC SDA SCL SCL SDA SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL SCL Data format Data type floating point Decimal places 3 Smallest string 4 charact...

Страница 52: ...3 Stop Command Sleep Sending commands to device A6 SDA Start Stop SCL A5 A4 A3 A2 A1 A0 W ACK ACK ACK First letter of command Last letter of command The entire command as ASCII with all arguments Addr...

Страница 53: ...l A6 A0 SDA SCL R ACK ACK ACK N bytes of data All bytes after data are Null Address bits ACK ACK NACK Response code Data Data N Null Null Start Stop R High Requesting data from device 9 560 1 0 ASCII...

Страница 54: ...lly Reading back the response code is completely optional and is not required for normal operation Example If there is no processing delay or the processing delay is too short the response code will a...

Страница 55: ...X RX SCL Green Taking reading SDA TX RX SCL Purple Changing I2 C ID SDA TX RX SCL Red Command not understood SDA TX RX SCL White Find LED color definition r 0 1 LED ON 5V 3 3V 2 2 mA 0 6 mA 45 Copyrig...

Страница 56: ...enable disable protocol lock finds device with blinking white LED change I2 C address performs calibration switch back to UART mode L R i Slope T Sleep Status Plock Find I2C Cal Baud All commands are...

Страница 57: ...l 1 Dec 0 Null SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL L 1 LED on L 0 LED off L LED state on off Command syntax default L 1 L 0 L 1 L 0 L Example Response 300ms processing delay or Wai...

Страница 58: ...SCL Find Find LED rapidly blinks white used to help find device Command syntax Find Example Response r 0 1 This command will disable continuous mode Send any character or command to terminate find 30...

Страница 59: ...TX RX SCL Transmitting Blue Standby Green Taking reading SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL Short SDA TX RX SCL Wait 900ms Wait 900ms R return 1 reading Command syntax R Example Response 900ms...

Страница 60: ...ommand after the EZOTM pH circuit has been calibrated will clear the other calibration points Full calibration will have to be redone Command syntax Cal mid 7 00 Cal low 4 00 Cal high 10 00 Cal clear...

Страница 61: ...ibration settings Import Use this command to load calibration settings to one or more devices Import n Response breakdown of strings to export Export strings can be up to 12 characters long 10 of byte...

Страница 62: ...hed the ideal pH probe 100 3 is how closely the slope of the base calibration matches the ideal pH probe 99 7 100 3 Response breakdown After calibrating a pH probe issuing the slope command will show...

Страница 63: ...Response 1 Dec 0 Null Wait 300ms Wait 900ms Wait 300ms 8 91 T 19 5 1 1 ASCII ASCII Dec Dec 0 Null 0 Null 300ms processing delay RT n set temperature compensation and take a reading This is a new comma...

Страница 64: ...rmation Wait 300ms i device information Command syntax i Example Response 300ms processing delay i pH 1 98 1 ASCII Dec 0 Null Response breakdown i Device pH Firmware 1 98 r 0 1 54 Copyright Atlas Scie...

Страница 65: ...rt Command syntax Status Example Response 300ms processing delay Status P 5 038 1 ASCII Dec 0 Null Restart codes P powered off software reset brown out watchdog unknown S B W U Status Reason for resta...

Страница 66: ...power Command syntax Sleep Example Response no response wakes up device Any command Send any character or command to awaken device SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL Sleep Sleep S...

Страница 67: ...Plock Example Response 300ms processing delay Wait 300ms Wait 300ms Wait 300ms Locks device to I2 C mode SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL Short SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL Shor...

Страница 68: ...he CPU is updated with the new I2 C address Default I2 C address is 99 0x63 I2C n Command syntax I2C 100 device reboot Example Response 300ms processing delay I2C 100 SDA TX RX SCL SDA TX RX SCL SDA T...

Страница 69: ...y device reboot Example Response Factory SDA TX RX SCL SDA TX RX SCL SDA TX RX SCL reboot I2 C address will not change Clears calibration LED on Response codes enabled r 0 1 Factory reset will not tak...

Страница 70: ...standby SDA TX RX SCL Green Taking reading SDA TX RX SCL Purple Changing I2 C ID SDA TX RX SCL Red Command not understood SDA TX RX SCL White Find Blue I2 C standby SDA TX RX SCL Green Taking reading...

Страница 71: ...TX RX SCL Manual switching to UART Make sure Plock is set to 0 Disconnect ground power off Disconnect TX and RX Connect TX to PGND Confirm RX is disconnected Connect ground power on Wait for LED to ch...

Страница 72: ...on header 2Place a 3 position header at both top and bottom of the 8 position 2 54mm 0 1 17 78mm 0 7 3 Delete the 8 position header The two 3 position headers are now 17 78mm 0 7 apart from each other...

Страница 73: ...in commands about firmware version Datasheet V 4 7 Added new command RT n for Temperature compensation located on pages 29 UART 53 I2 C Added firmware information to Firmware update list Datasheet V 4...

Страница 74: ...t V 3 9 Added accuracy range on cover page and revised isolation info on pg 10 Datasheet V 4 0 Datasheet V 4 1 Added new commands Find pages 23 UART 46 I2 C Export Import calibration pages 27 UART 49...

Страница 75: ...get erased if the circuit lost power 900ms into startup V1 97 EEPROM Oct 10 2016 Added the option to save and load calibration V1 98 EEPROM Nov 14 2016 Fixed glitch during calibration process V2 10 Ma...

Страница 76: ...ponents If the EZO class pH circuit is being connected to a microcontroller the microcontroller must be running code that has been designed to drive the EZO class pH circuit exclusively and output the...

Страница 77: ...on Atlas Scientific can no longer take responsibility for the EZO class pH circuits continued operation This is because that would be equivalent to Atlas Scientific taking responsibility over the corr...

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