Overview
The SCLT3-8BT8 is an octal industrial digital input IC produced by STMicroelectronics. This component is designed to significantly reduce the power dissipation of digital input modules. It features current-sinking inputs that can be configured to meet Type 1, Type 2, or Type 3 input characteristics as per IEC 61131-2 with minimal external components. The SCLT3 series includes a serial interface that translates, conditions, and serializes the data to CMOS-compatible signals through an SPI interface, enhancing the I/O module’s density and reducing the number of optocouplers required.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Min | -0.3 | V |
| Input Voltage Max | 30.0 | V |
| Bus Power Supply DC Voltage | 15 to 35 | V |
| Internal Logic Power Supply Voltage | 5 | V |
| Maximum Input Frequency (8-bit mode) | 20 | kHz |
| Maximum SPI Clock Frequency | 0.1 to 2 | MHz |
| Operating Ambient Temperature Range | -40 to 105 | °C |
| Package Type | HTSSOP-38, QFN-48L | |
| Packing Type | Tape And Reel | |
| RoHS Compliance | Ecopack2 | |
| ECCN US | EAR99 | |
| ECCN EU | NEC |
Key Features
- Eight current-sinking digital inputs with serializer, configurable for Type 1, Type 2, or Type 3 inputs as per IEC 61131-2.
- Adjustable and accurate input current limitation for low power and heat dissipation: 2.35 mA typ for Type 1 and Type 3.
- Integrated glitch and debounce filter with selectable delay time: 20 µs to 3 ms for EMC robustness.
- 35 V reverse polarity capable.
- SPI-Compatible Serial Interface (8-bit or optional 16-bit mode with parity check and diagnostics).
- Daisy-Chain SPI to reduce isolation channels.
- 5 V voltage regulator.
- Energyless Field-Side LED drivers for visual status indication.
- Complies with IEC 61000-4-2 and IEC 61000-4-4 standards for electromagnetic compatibility.
Applications
The SCLT3-8BT8 is suitable for various industrial applications requiring high-density digital input modules with low power dissipation. These include:
- Industrial automation systems where robust and reliable digital input interfaces are crucial.
- Control systems that require compliance with IEC 61131-2 standards.
- Applications needing daisy-chaining capabilities to reduce the number of isolation channels.
- Systems requiring visual status indication through LED drivers.
- Environments where electromagnetic compatibility and robustness against transient immunity are essential.
Q & A
- What is the SCLT3-8BT8 used for?
The SCLT3-8BT8 is an octal industrial digital input IC used to reduce power dissipation in digital input modules and enhance I/O module density.
- What are the input voltage ranges for the SCLT3-8BT8?
The input voltage range is from -0.3 V to 30 V.
- What types of inputs can the SCLT3-8BT8 be configured for?
The SCLT3-8BT8 can be configured for Type 1, Type 2, or Type 3 inputs as per IEC 61131-2.
- What is the maximum SPI clock frequency for the SCLT3-8BT8?
The maximum SPI clock frequency is 2 MHz.
- Does the SCLT3-8BT8 have built-in filtering capabilities?
Yes, it includes an integrated glitch and debounce filter with selectable delay times from 20 µs to 3 ms.
- What are the operating temperature ranges for the SCLT3-8BT8?
The operating ambient temperature range is from -40 °C to 105 °C.
- Is the SCLT3-8BT8 RoHS compliant?
Yes, it is RoHS compliant with an Ecopack2 rating.
- What packages are available for the SCLT3-8BT8?
The SCLT3-8BT8 is available in HTSSOP-38 and QFN-48L packages.
- Does the SCLT3-8BT8 support daisy-chaining?
Yes, it supports daisy-chaining to reduce the number of isolation channels.
- What standards does the SCLT3-8BT8 comply with for electromagnetic compatibility?
The SCLT3-8BT8 complies with IEC 61000-4-2 and IEC 61000-4-4 standards.
