Datasheet

0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
The EC OEM
™
Embedded Electrical Conductivity Circuit needs to be connected
to a conductivity probe. Conductivity probes are differentiated by the probe’s cell
constant. Any cell constant from K 0.01 – K 600 can be used. By default the probe type
is set to K 1.0
To send a new K constant to the EC OEM
™
, the value of the K constant must be
multiplied by 100 and then transmitted to the EC OEM
™
. The K constant will be divided
by 100 internally.
K = 9.8
9.8 x 100 = 980
980 to HEX = 0x03D4
Probe Type MSB Register = 0x03
Probe Type LSB Register = 0xD4
Example
To set the probe type to a K constant of K = 9.8, the master device will transmit the
number 980. Obviously the number 980 cannot be stored in a single 8 bit register. Move
the value from a float to an unsigned word. Break up the unsigned word into its MSB and
LSB. Send the MSB to register 0x08 and the LSB to register 0x09
0x08 – 0x09 Set probe type
unsigned word
Default value = K 1.0
Probe type
R/W
R/W
R/W
R/W
0x04: Interrupt control
0x05: LED control
0x06: Active/hibernate
0x07: New reading available
R/W
R
Read only
Read and write
Accessible registers
R/W
R/W
0x02: SMBus/I
2
C address lock/unlock
0x03: SMBus/I
2
C address
0x10: Temperature compensation MSB
0x11: Temperature compensation high byte
0x12: Temperature compensation low byte
0x13: Temperature compensation LSB
0x14: Temperature confirm MSB
0x15: Temperature confirm high byte
0x16: Temperature confirm low byte
0x17: Temperature confirm LSB
Confirmation
Compensation
R
R
0x00: Device type
0x01: Firmware version
Device information
Device address
R/W
R/W
0x08: Set probe type MSB
0x09: Set probe type LSB
R/W
0x0E: Calibrate request
0x0F: Calibration confirm
Probe type
Control
R/W
R/W
R/W
R/W
0x0A: Calibration value MSB
0x0B: Calibration value high byte
0x0C: Calibration value low byte
0x0D: Calibration value LSB
0x18: EC reading MSB
0x19: EC reading high byte
0x1A: EC reading low byte
0x1B: EC reading LSB
Sensor Data
R
R
R
R
R
R
R
R
R
R
R
R
0x1C: TDS reading MSB
0x1D: TDS reading high byte
0x1E: TDS reading low byte
0x1F: TDS reading LSB
R
R
R
R
0x20: Salinity reading MSB
0x21: Salinity reading high byte
0x22: Salinity reading low byte
0x23: Salinity reading LSB
R
R
R
R
Calibration
R
Settings to this register are retained if the power is cut.
MSB
LSB
0xD4
0x03
Write
Write
0x08
0x09
0xD4
0x03
980
MSB
LSB
0xD4
0x03
Write
Write
0x08
0x09
0xD4
0x03
980
20
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