OEM RTC–P2TC - Super precision Real Time Clock (RTC) Plus 2 Thermistor Temperature Compensation (TC) Industrial Super Transducer, With Battery backup option.

The RTC-P2TC is a real time clock module with to temperature interface via 10K or 20K Thermistors super transducer board for HVAC (Heating, Ventilation and Air Conditioning), Commonly utilized as the heart of RTC In-PLC and microcontroller power of 5VDC or 3.3VDC such as ARM micro.

The RTC-P2TC board is designed to Real Time Clock to I2C bus conversion (transducer). If used properly, it will eliminate the need for an expensive board, which would otherwise be needed to carry out the same tasks.

I2C RTC Plus dual Thermistors Interface board

The RTC-P2TC  is easy to install, setup, and operate. If you want to do professional Temperature readings and logging related functions while keeping time (HH:MM:SS) and day reference, The RTC-P2TC offers the features you need. It can be mounted easily via 0.125" mounting holes using 4-40 screws.

Simply connect the board to power connect the Thermistors to the board input and connect your PLC or Micro to the I2C bus and TC output.

The RTC-P2TC, serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C, bi-directional bus. The clock / calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. Module has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the part operates from the backup supply.

Super performance in is class; The Module design to power of 5VDC and/or 5VDC and 3.3VDC. For new generation microprocessors.

Super precision Real Time Clock (RTC) Plus 2 Thermistor Temperature Compensation (TC)

1. Power VCC1= 5V DC, COM, VCC2 = 3.3V or 5V

2. I2C Bus, SDA (I2C data), (I2C clock)

3. TC Outputs, OUT1, COM, OUT2

4. TC1 Input, TC1, COM

5. TC2 Input, TC2, COM

6. Power Indicator

7. Battery holder for 3.3V Battery (option)

Frequency to Voltage industrial standard configuration models:

Mounting Option

Simply snap the Din-Rail mounted enclosure into your NEMA 4 box (enclosure) for watertight applications

EID-1593LTBU Translucent blue ABS plastic instrument enclosure with Din-Rail mounting options, side view

The board shown above mounted in EID-1593LTBU Translucent blue ABS plastic instrument enclosure with Din-Rail mounting options and battery option.

Plastic enclosure Din-Rail-clip and battery are sold separately (for demonstration only).

Calculating the thermistor's temperature:

The thermistor resistance (R) should be obtained from the following formula:

Where V_out (OUT1 and OUT2) is the output voltage of the corresponded thermistor;

R = RX * { (VCC2 / Vout) -1}

 

Where; RX = 10K model A and 20K model B

           VCC2 = 3.3V model A and 5V model B

 

i.e VCC2 = 3.3V and RX = 20K @ 25C R = 20K Ohms

After finding the resistance (R) of the thermistor, all that's left to do is to plug it into the Steinhart-Hart thermistor equation (see below) and get the current temperature.

The Steinhart-Hart thermistor equation is derived from mathematical curve-fitting techniques and examination of the resistance versus temperature characteristics of thermistor devices.

Where T is the temperature in Kelvin (note: 0°C = 273.15K), and A, B, and C are constant factors for the thermistor that is being molded.

Steinhart-Hart Equation:

T = 1 / {A + B[ln(R)] + C[ln(R)]^3}

A = 0.001129148 

B = 0.000234125 

C = 8.76741E-08

Please be advised, the coefficients A, B, and C are constant factors of the individual thermistor. The above coefficients are given for 10K @ 25C carve 3 (K3) thermistor from Betatherm , Inc. MA, USA.

Pricing 

* Prices, SKU#, P# specification and colors are subject to change without notice. 

RTC-P2TC Model A Real Time Clock Plus 2 TC module with terminal-block (12 positions). 10K Thermistors are sold seperatly.

EID-RTC-P2TC-A10-12TB

$97.93

RTC-P2TC Model A Real Time Clock Plus 2 TC module with terminal-block (12 positions). 20K Thermistors are sold seperatly.

EID-RTC-P2TC-A20-12TB

$97.93

RTC-P2TC Model A Real Time Clock Plus 2 TC module with terminal-block (12 positions). 10K Thermistors are sold seperatly.

EID-RTC-P2TC-A10-12TB

$93.93

RTC-P2TC Model A Real Time Clock Plus 2 TC module with terminal-block (12 positions). 20K Thermistors are sold seperatly.

EID-RTC-P2TC-A20-12TB

$93.93

Modified Translucent blue ABS Plastic Instrument enclosures option

EID-1593LTBU

$10.75

Din rail mounting mounting kit option

EID-1427DINCLIP

$4.24

SENSER-TM10 General purpose SS sensor with 10K thermistor, with 3' cable

EID-T-0TM-A010

$45.99

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