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functions are shown in Table 1. Figure 2. Pin Assignment Table 1. Pin Function Descriptions another switch-mode TEC controllers, laser drivers or power supplies.
2 TGD Digital output
3 SDN/SBN/
mode TEC controllers, laser drivers or power supplies. 4 GND Ground Signal ground for the potentiometers, ADCs, DACs and the thermistor.
5 VTEC Analog output
20 SNO
Copyrights 2000-2019, Analog Technologies, Inc. All Rights Reserved. Updated on 2/27/2019 www.analogti.com 3 Analog Technologies Inc. ATW3A314 High Efficiency Window TEC Controller
6 ITEC Analog output
TEC current indication. ITEC is an analog voltage output pin with a voltage proportional to the actual current going through the TEC. Ther e is a 1.25V offset voltage on this pin, when the current is zero, the output voltage of this pin is 1.25V. The output current is calculated as: ITEC (A) = 2.4 × [VVIEC (V) − 1.25V]. When the voltage is 2.5V, the output current is 3A, the TEC works under cooling mode; when this voltage is 0V, the output current is negative 3A, the TEC works under heating mode. 7 VDR Analog input Compensation input pin for the thermal control loop. 8 CMI Analog input Compensation input pin for the thermal control loop.
9 TMO Analog output
Actual target object temperature indication, its voltage is proportional to the temperature almost linearly. It swings from 0V to 2.5V, corresponding to 10 °C to 40 °C by default. The detail temperature vs. the voltage relationship is given in page 5.
10 ILM Analog input
Sets maximum output current across TEC. Figure 5 shows the connections. To set the maximum current to be Imaxc, the resistance of the resistors R4 and R5 can be calculated as: IH: the heating current. R4//80k refers to R4 and 80K are connected in parallel. I C: the cooling current. R5//80k refers to R5 and 80K are connected in parallel Notice: if you need to use this pin to limit the output current, IC>IH forerver. 11 TSL Analog input Sets the lower temperature limit for the temperature window. 12 TSU Analog input Sets the upper temperature limit for the temperature window.
13 VLM Analog input
Sets the maximum output voltage across TEC. The maximum voltage applied across the TEC can be limited. To set the maximum output voltage to be V MAX, VLM should be set at VVLM = VMAX/5. If no limitation is needed, tie this pin to ground. 14 2.5VR Analog output Reference voltage output, 2.5V. It can be used by a POT or DAC for setting the set-point temperature window voltages on the TMSU and TMSL pins and/or a DAC for measuring the temperature through the TMO pin. The maximum sourcing current capability is 1.5mA and the maximum sinking is 4mA with a stability of <50ppm/ °C max.
15 RTH Analog input
Connects to the thermistor for sensing the target object temp. The other end of the thermistors is connected to the signal ground, pin 16, or pin 5. The thermistor’s value can range from 1k to 100k@25°C. The most commonly used value is 10k@25°C. 16 GND Ground Signal ground for the potentiometers, ADCs, DACs and the thermistor.
17 TECP Analog power
output Connects to TEC positive terminal.
18 TECN Analog power
output Connects to TEC negative terminal. 19 PGND Power ground Power ground for connecting to the power supply. 20 VPS Power input Power supply positive rail, the operating range is 3.1V to 5.5V. )80//(
105 RkR
+−= )80//( )80//(105 kRR kRIC +−=
Table 2. Characteristics (Tambient = 25°C) The block diagram of the controller is shown in Figure 4. Figure 4. Window TEC Controller Block Diagram
Table 4. Unit Price
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