THORLABS MTD415T Manuel utilisateur

Data Sheet

Miniature Temperature Controller MTD415T

Features

Small, safe and very high accuracy complete single-module controller

High speed, ultra stable digital PID Loop

Up to ± 1.5 A TEC current

Very low output current noise

Very small footprint (21.0 x 12.4 mm)

Circuit Height 3.1 mm

Supports 10 k

thermistor temperature sensor

Single power supply operation

Applications

Active cooling and temperature stabilization for a wide range of laser modules and diodes

WDM, DWDM Laser-Diode Temperature Control

EDFA Optical Amplifiers

Temperature stabilization of photo detectors and photodiodes

ATE

Short Description and Typical Application Diagram

The MTD415T is a compact and highly integrated temperature controller optimized for use in

high performance thermoelectric temperature control applications.

The on-chip power stage and the thermal control loop circuitry minimize external components

while maintaining high efficiency.

The output current is directly controlled to eliminate current surges. An adjustable TEC current

limit provides the highest level of TEC protection.

The MTD415T is operated from a single power supply and provides a bipolar ±1.5 A output by

connecting the TEC to the output of a bipolar power stage. True bipolar operation ensures

temperature control without “dead zones” or other nonlinearities at low TEC current values.

The digital control interface allows quick access to all system parameters as well as to digital

measurement data, this way enabling a simple integration into different systems.

MTD415T Data Sheet Rev. 1.0 1

Revision History

Revision

Changes with respect to previous revision

1.0

Initial Release

2MTD415T Data Sheet Rev. 1.0

MTD415T

Contents

1 4Pin Configuration and Functions

2 6Technical Data

62.1 Absolute Maximum Ratings

62.2 Recommended Operating Conditions

72.3 Electrical Characteristics

3 8Typical Output Characteristics

4 9Functional Block Diagram

5 11Typical Application

6 12Programmers Reference

126.1 Nomenclature

126.2 Command Description

126.2.1 General Commands

136.2.2 TEC Commands

146.2.3 Temperature

156.2.4 Control Loop

176.2.5 Save Settings

176.2.6 Factory Default Settings

186.3 Error Register and Safety Bitmask

7 20PID Tutorial

8 22Troubleshooting

9 23Drawing

10 24List of Acronyms

11 25Warranty

12 26Copyright and Exclusion of Reliability

13 27Thorlabs 'End of Life' Policy

14 28Thorlabs Worldwide Contacts

MTD415T

MTD415T Data Sheet Rev. 1.0

1 Pin Configuration and Functions

MTD415T Pin Configuration

Name

Description

VDD

Supply Voltage Input

Connect a + 4.5 V to 5.5 V power supply to VDD.

GND

Supply Voltage Ground

Connect the power supply ground connections to GND.

GND

Supply Voltage Ground

Connect the power supply ground connections to GND.

DNC

Do Not Connect

Do not connect this pin to any signal or potential. This pin is used for

manufacturing and test purposes.

DNC

Do Not Connect

Do not connect this pin to any signal or potential. This pin is used for

manufacturing and test purposes.

VREF

Reference Output Voltage for Thermistor Temperature Sensor

Connect this reference voltage output ( 1.8 V) to one end of the 10 k

thermistor.

TEMP

Thermistor Temperature Sensor Input

Connect this pin to the other end of the 10 k

thermistor.

GNDS

Temperature Sensor Ground

Can be used for shielding purposes or left open.

GND

Supply Voltage Ground

Connect the power supply ground connections to GND.

ENABLE

Enable Signal Input (Low-Active)

Enable Input (Low = enabled, High = Disabled ), can be connected

directly to GND.

STATUS

Status Signal Output (Can be left floating)

Status Signal (High = temperature within defined temperature

window, Low = Temperature outside programmed temperature

window or an error occurred).

Digital Interface Transmit Signal

UART Transmit Asynchronous Data Output. Connect this pin to the

RX pin of your application.

1 Pin Configuration and Functions

MTD415T Data Sheet Rev. 1.0

Name

Description

Digital Interface Receive Signal

UART Transmit Asynchronous Data Input. Connect this pin to the TX

pin of your application.

GND

Supply Voltage Ground

Connect the power supply ground connections to GND.

TEC -

TEC Element negative connection

Connect this pin to the negative terminal of the TEC element.

TEC +

TEC Element positive connection

Connect this pin to the positive terminal of the TEC element.

MTD415T

MTD415T Data Sheet Rev. 1.0

2 Technical Data

2.1 Absolute Maximum Ratings

Supply Input Voltage

4.5 V to 6 V

Supply Input Current

1.6 A

TEC Output Current

-1.5 A to 1.5 A

TEC Compliance Voltage

4.0 V

Maximum Output Power

6.0 W

Power Dissipation

1.5 W

Pin Voltage Range 1)

VDD

ENABLE, RX, TEC-, TEC+

TEMP

-0.3 V to 6 V

-0.3 V to (VDD + 0.3 V)

-0.3 V to 3.3 V

Maximum Output Current STATUS, TX

10 mA

Maximum Input Current ENABLE, RX

10 mA

Operating Temperature

-40 °C to + 70 °C

1) All voltages with respect to network ground terminal.

Notes

(1) Above specifications are given for the free-air operating temperature range unless

otherwise noted.

(2) Stresses beyond those listed above may cause permanent damage to the product. These

are stress ratings only; functional operation of the MTD415T at these or any other

conditions beyond those indicated under Recommended Operating Conditions and

Electrical Characteristics is not implied.

(3) Operation beyond the maximum rated conditions for extended periods may affect product

reliability.

2.2 Recommended Operating Conditions

Supply Voltage

4.5 to 5.5 V

Operating Temperature

-20 to + 60 °C

2 Technical Data

MTD415T Data Sheet Rev. 1.0

2.3 Electrical Characteristics

TEC Current Output

Output Current

up to ±1.5 A into 2.66

TEC - see diagram on page .

Compliance Voltage

4.0 V

Output Power

up to 6.0 W

Measurement Resolution

better than 8 mA, typ. 3 mA

Measurement Accuracy

± 50 mA

Noise and Ripple (typ.)

< 10 mA 1)

TEC Current Limit

Setting Range

0 to 1.5 A

Setting Resolution

1 mA

Setting Accuracy

± 50 mA

Temperature Sensor

Supported Sensor

10 k

Thermistor 5)

Maximum Temperature Control Range 2)

+ 5 °C to + 45 °C

Temperature Setting Resolution

1 mK

Temperature Measurement Resolution 3)

better than 10 mK; typ. 2 mK

Absolute Temperature Accuracy 2)

± 0.5 °C

Temperature Stability over 8 h, typ.

better than 20 mK

Temperature Coefficient

< 20 mK/°C

Programming Interface

Type

UART

Voltage Level

3.3 V Logic Level; input 5 V tolerant

Data Rate

115.200 bps; 8 Data Bits, 1 Stop Bit

General Data

Safety Features

TEC Current Limit

Sensor Fault Protection

TEC Open Circuit Protection

Temperature Setpoint Limit

Temperature Window Protection Delay

Over Temperature Protection

Operating Temperature

-20 °C to +60 °C 4)

Storage Temperature

-40 °C to +100 °C 4)

Warm-Up Time for Rated Accuracy

10 min

Dimensions (W x H x D)

21 x 12.4 x 3.1 mm³

Approx. Weight

2 g

1) Measured with a TEC element with an equivalent resistance of 4

2) Control range and thermal stability depend on thermistor parameters.

3) Maximum measurement resolution depends on cycle time settings. Please refer to Programmers Reference.

4) non-condensing

5) Use only thermistors with 10k

resistance at 25 °C (R25°C). Resistance Measurement Range: 4.2 to 29 k

All technical data are valid at 23 ±5 °C and 45 ±15% rel. humidity (non condensing)

MTD415T

MTD415T Data Sheet Rev. 1.0

3 Typical Output Characteristics

Notes

1. The maximum TEC current of 1.5 A can be delivered into a load resistance of 2.66

recommended operating conditions.

2. At higher load resistance, the maximum output current drops due to compliance voltage

limitation.

3. The maximum output current at lower than 2.66

load resistance (colored range) depends

on environmental conditions.

Notes

1. The maximum output power of 6 W can be delivered into a load resistance of 2.66

recommended operating conditions.

2. The maximum output power at lower than 2.66

load resistance (colored range) depends

on environmental conditions.

4 Functional Block Diagram

MTD415T Data Sheet Rev. 1.0

4 Functional Block Diagram

Functional Block Diagram MTD415T

Principle of Operation

In general, a temperature controller (within the blue frame) is a closed loop system. A

temperature sensor measures the temperature of the controlled object (e.g., a laser diode).

This actual temperature signal is amplified and compared with the temperature set value.

The differential signal out of the comparator controls then the current of the thermoelectric

cooler in order to maintain the temperature of the object constant. Ideally, the temperature

settling is carried out in the shortest times, with minimum settling error and without temperature

overshoots.

A thermoelectric coolers is a Peltier element that produces a temperature gradient depending

on the current direction trough the TEC. For this reason, the TEC current must be bidirectional.

In order to adapt the control loop to different thermal loads, and to optimize the temperature

controller's response characteristics, a PID amplifier is used. Closer information please see in

the PID Tutorial (page )

MTD415T

MTD415T Data Sheet Rev. 1.0

Functional Description

The MTD415T is a miniature, closed-loop temperature controller module. It is compatible with a

10 k

NTC (thermistor) temperature sensor and it's output is designed for control of

thermoelectric coolers (TEC).

The MTD415T delivers a TEC current up to 1500 mA at 4.0 V compliance voltage.

Power Supply

The supply voltage ranges from 4.5 V to 5,5 V. From the supply voltage, the internal supply

voltage for the microcontroller is derived. Further, a reference voltage for the temperature

sensor is generated (VREF; 1.8 V).

TEC Current Control

The TEC element is connected between TEC+ and TEC-. A correct connection is essential to

avoid wrong temperature correction.

The MTD415T allows to limit the maximum TEC current. Lowering the TEC current limit might

be helpful for control loop optimization in case of low thermal loads and lowers the dissipated

by the MTD415T power.

Micro-controller

The functions of the microcontroller are:

Comparison of the actual temperature with the set temperature;

Generation of the control signal for TEC output stage with respect to the comparator

signal;

PID loop control for optimization of the temperature settling time and for minimizing the

final temperature error.

All parameters (TEC current limit, set temperature, temperature window, PID share settings

etc.) are programmed via the UART user interface. Detailed information about how to program

the MTD415T can be found in the section Programmers Reference on page .

Note

The UART interface uses 3.3 V logic level. Connect the UART to a PC only using an

appropriate converter, e.g., a commercially available UART-to-USB cable.

The Status signal informs about correct operation.

The temperature control is activated by setting the Enable pin to low.

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