Signal Consulting, LLC 

Model Si24BdTEPITC1-12BSD-50V-20A 

 Field-Programmable, Thermo-Electric (TE), Proportional and Integral (PI), 12-Bit, Temperature Controller (1 Load used for Heating and Cooling at the same time) with  Analog or Digital Control Inputs, Centigrade or Fahrenheit LCD Port,  RS232 Data-Logging Port,  Integrated Heat-Sink, 750Hz PWM





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Si24BdTEPITC1-12BSD-50V-20A Features:

Analog and Digital Control Ports: User can select between analog (Potentiometer) or Digital (Up/Down Keys) Control Inputs.

PI Temperature Control: 12-Bit Proportional and Integral (PI) Temperature Controller in the -550C to +1250C Range with 0.0650C  steps on 1 Load. The word "Bi-directional" implies that no wire reversal is required on the TE cell to accomplish the heating and cooling task.

Efficient H-Bridge with PWM: 750Hz Pulse-Width Modulation (PWM) is used to perform the heating and cooling function (at the same time) on a Peltier type (TE) cell, functioning as a bidirectional heat-pump.

One Digital Temperature Sensor: Digital Temperature Sensor with 0.06250C Resolution and 1/20C Accuracy  in the -100C to +800C  Range, and approx.  10C Accuracy in the -550C to +1250C  Range.

Temperature Sampling Rate:  The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with this same rate.

An LCD Port: For Set and Measured Temperature Display with Centigrade or Fahrenheit scales.

An RS232 Data Port: For Data Logging.

Field Programmable: The PI parameters can be changed with Up, Down, Next Keys or with the RS232 Data Port.

Alarm Kill Switch on J1: A normally open switch (or an Open Collector npn Transistor) can be connected to jumper port J1 (as shown below), J1 Open=Normal operation, J1 Short=Load (TE Cell) is open.

Voltage Requirement: VP (from pin +P to pin - P): 12V to 50V DC, unregulated DC voltage. 

High Power-Efficiency: 98.5% typical, at 50V and 20A

Max Load Power: 1000W at 50V, 20A.

Max Operating Temperature: +450C with the Integrated AP1 Aluminum Plate Heat Sink Heat Sink, as shown.
Power Semiconductors: Four 90A Hex-MOSFETs
Overall Dimensions: 4.0" x 3.3" x 1.4" (102 x 84 x 34mm).
Components Type: 100% Solid State, NO Relays

On Board:
Optically Isolated Control Signals
Filter Capacitors, Voltage Transient Suppression (VTS) diodes.
Bicolor LED Indicator,  (Red=Hot, Green=Cold) 
The board is protected by a fast-acting 20A Mini Fuse (DigiKey Part#: F993-ND).  




 For Details, Download the  Si24BdTEPITC1-12BSD-50V-20A-6Y1   Manual


The Si24BdTEPITC1-12BSD-50V-20A is a 50V 20A, microprocessor based, closed-loop, Bidirectional, Thermo-Electric, Proportional-Integral (PI) Temperature Controller board that heats and cools a thermal-zone. An efficient high-power H-bridge controls the current (in the 0 to +/- 20A range) to a Peltier type Thermo-Electric (TE) cell (or a bank of cells, connected in parallel), functioning as a bidirectional heat-pump. The word "Bi-directional" implies that no wire reversal is required on the TE cell to accomplish the heating and cooling task. By PI control, we mean that the amount of correction used in the control-loop is proportional to the difference and the Integral of the difference between the set and measured temperature values. In a properly tuned PI controller, the temperature overshoots and oscillations (“hunting”) are limited to approximately + or - 0. 50C. This controller has two operating modes: Program-Mode and Run-Mode. In the “Program-Mode” with Jumper J2 pins open circuited (J2=Open), seven control parameters are interactively selected and saved in nonvolatile memory. In the “Run–Mode”, with Jumper J2 pins short circuited (J2=Short), the board functions as a Bi-directional Temperature-Range Controller as directed by the seven programmed parameters. An onboard microprocessor measures and controls the temperature; monitors the user inputs; and drives a 2 line x 16 character LCD. The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with the same rate.  A small 12-bit digital temperature sensor, Signal’s part number Si24DTsens-12B , (connected to port CN3) is used to measure and control the temperature in the -500C to +1250C range, with 10 C accuracy and with 0.0650 C precision. Because this sensor is digital, it is virtually immune to noise and loading; ideally suited for remote sensing. This sensor uses a unique “1-wire interface” (with parasite power mode) that requires only 2-conductors for reliable remote (typical length of 20 meters) temperature sensing. In the Analog Mode (ModePar=2 or 3), the desired set-temperature is linearly adjusted (in the -250C=0V to +1020C=+5V range, with 0 C=19.68mV steps) with the Si5Pot1-5k  potentiometer (connected to pin I1 of Port CN6). In the Digital Mode (ModePar=0 or 1), the desired set-temperature is adjusted with the Si24PB2-MC3 Up/Down Keys (two Normally-Open Push Buttons, connected to Port k0) in the -500C to +1250C range, with 0.0650 C steps. An LCD port (with 9600 Baud RS232 Interface Standard) is provided for display of the Set and Measured temperature data. The LCD can be ordered from Signal under part number Si14LCD2L16CH-4PC  (2-Line by 16-Char display with 12” cable and 4-pin connectors, and with back-light). In addition, a Full-Duplex, 9600 Baud, RS232 Data-Logging Port (on CN5) is also provided. A bicolor LED is used to monitor the TE cell (or load) voltage (Red = Heat, Green = Cold). This board operates with a single unregulated voltage source (12V to 50V range). A small Aluminum Plate (3.3”x4.0”x0.065”) is required to operate at 1000W power level. Higher power-levels can be achieved with more efficient heat-sinks. Typical applications are: Peltier Effect TE Coolers, Heat Pumps, etc. This board can be configured and programmed to perform efficiently in many customized applications.

A Typical Application of the Si24BdTEPITC1-12BSD-50V-20A

In this 12-bit, closed-loop, PI temperature control application, and in the Analog Mode, the Set-Temperature is linearly adjusted with the Si5Pot1-5k  potentiometer (connected to port CN6). In the Digital Mode, the Set-Temperature is adjusted with the Si24PB2-MC3 Up/Down Keys (on port k0). The Set and Measured ASCII values are presented on the Data-Logging pin CN5-Tx (connected to a PC using the Si24DB9cable-3FM ) when prompted by one ASCII character on pin CN5-Rx. The Peltier type Thermo-Electric (TE) cell is functioning as a bidirectional heat-pump; operating with any 20A unregulated DC power supply. The TE cells can be purchased from: The temperature of the thermal zone is measured with the Si24DTsens-12B Digital Sensor (Si24DTsens-Spec1-DS18B20) with 12” leads and connector. The optional LCD can be ordered from Signal as part number Si14LCD2L16CH-4PC  (2x16 display with 12” cable and 4-pin connectors, and with back-light). A wide variety of Linear and Switching-Type Power Supplies can be purchased from: Warning:  The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.


 Click on this Blue Link to  Download the  Si24BdTEPITC1-12BSD-50V-20A-6Y1   Manual


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Si24BdTEPITC1-12BSD-50V-20A,  Bidirectional Thermo-Electric Proportional and Integral (PI) Temperature Controller 50V, @ 20A.
Price $229.00

Note: The Si24BdTEPITC1-12BSC-50V-20A can be operated in different applications. You need to order different accessories depending on your application. The Si24DTsens-12B  12-Bit Digital Thermometer is always required but the other accessories are optional. In each of the applications, the board can be programmed; and the current data can be displayed or logged. 

PC Application:  The board is connected to a 9600 Baud full-duplex ASCII controller (typically a PC or laptop computer, using a HyperTerminal or Putty type program); you only need to order the Si24DB9cable-3FM  RS232 cable.

LCD Application: The board is connected to the Si14LCD2L16CH-4PC   (2-Line by 16-Character Serial LCD) and programmed with the Si24PB2-MC3  Push-Buttons.

Si3HIA Application: The board is connected to the Si3HIA-UD Human Interface Accessory,  that includes a 2-line by 16-character, transflective, serial LCD with back lighting, a 5k Ohm 10 Turn Potentiometer and 3-push buttons (Up, Down and Next) mounted on a 3 by 4 inch PCB board.

Si24DTsens-12B   12-bit Digital Thermometer ( -550C to +1250C Range, in 0.0650C Steps ) with 12" leads and 3pin Molex Connector. 
Price $39.00
Si14LCD2L16CH-4PC  Optional 2 Line by 16 Character Serial LCD with 12" long cable and 4-pin Connector.  
Price $59.00
Si24PB2-MC3   Two Push-Buttons with 12" lead and with a 3-pin FM Molex Connector.
Price $29.00
Si3HIA-UD Human Interface Accessory, includes a 12 inch long ribbon cable with 8-pin connectors.
Price $79.00
Si24DB9cable-3FM  RS232 cable, 1m long with connectors.
Price $19.00

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Availability: We usually ship in 2-3 business days.



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