Overview
The ISO1212DBQR, produced by Texas Instruments, is a dual-channel isolated digital-input receiver. This device is designed to receive up to 60-V digital input signals and provide isolated digital outputs, eliminating the need for a field-side power supply. It complies with IEC 61131-2 Type 1, 2, and 3 characteristics, making it suitable for various industrial applications. The ISO1212 features an external resistor (RSENSE) to set the current limit and another resistor (RTHR) to adjust the voltage transition thresholds, ensuring flexibility and precision in different operational scenarios.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 16-pin SSOP (DBQ) | |
| Input Voltage Range | 9-V to 60-V DC and AC | |
| Output Enable | EN pin, high or open to enable outputs | |
| Current Limit | Set by RSENSE resistor, typical 2.25 mA for Type I and III | |
| Voltage Transition Thresholds | Adjustable using RTHR resistor | |
| Maximum Power Dissipation | 450 mW (both sides), 20 mW (output side), 430 mW (field input side) | |
| Thermal Resistance | RθJA: 116.9 °C/W, RθJC(top): 56.5 °C/W, RθJB: 64.7 °C/W | |
| Isolation Voltage | Maximum repetitive peak: 566 VPK, Maximum surge: 4000 VPK | |
| Safety Certifications | DIN VDE V 0884-11, UL 1577, IEC 60950-1, IEC 62368-1, GB 4943.1-2011 |
Key Features
- Dual-channel isolated digital-input receiver with IEC 61131-2 Type 1, 2, and 3 characteristics.
- No field-side power supply required.
- External resistors (RSENSE and RTHR) for current limit and voltage threshold adjustments.
- Supports fast and slow signal input channels (up to 4 Mbps and <1 Kbps respectively).
- EMC protection using TVS diodes or capacitors depending on the signal data rate.
- Safety-related certifications including DIN VDE V 0884-11, UL 1577, and IEC 60950-1.
Applications
- Programmable Logic Controllers (PLCs) - Digital Input Modules and Mixed I/O Modules.
- Motor Drive I/O and Position Feedback.
- CNC Control.
- Data Acquisition.
- Binary Input Modules.
Q & A
- What is the ISO1212DBQR used for?
The ISO1212DBQR is used as a dual-channel isolated digital-input receiver, suitable for industrial applications requiring isolated digital inputs.
- What are the input voltage ranges supported by the ISO1212DBQR?
The device supports input voltage ranges from 9-V to 60-V DC and AC.
- How is the current limit set in the ISO1212DBQR?
The current limit is set using an external resistor (RSENSE).
- What are the safety certifications of the ISO1212DBQR?
The device is certified under DIN VDE V 0884-11, UL 1577, IEC 60950-1, IEC 62368-1, and GB 4943.1-2011.
- Can the ISO1212DBQR handle fast and slow signal inputs?
Yes, it supports both fast signal inputs (up to 4 Mbps) and slow signal inputs (<1 Kbps).
- How is EMC protection achieved in the ISO1212DBQR?
EMC protection can be achieved using TVS diodes for fast signal inputs and capacitors for slow signal inputs.
- What is the maximum power dissipation of the ISO1212DBQR?
The maximum power dissipation is 450 mW for both sides, 20 mW for the output side, and 430 mW for the field input side.
- What are the thermal resistance values for the ISO1212DBQR?
The thermal resistance values are RθJA: 116.9 °C/W, RθJC(top): 56.5 °C/W, and RθJB: 64.7 °C/W.
- What is the maximum repetitive peak isolation voltage of the ISO1212DBQR?
The maximum repetitive peak isolation voltage is 566 VPK.
- In which industrial applications is the ISO1212DBQR commonly used?
It is commonly used in PLCs, motor drive I/O, CNC control, data acquisition, and binary input modules.
