TIDA-00548
4-20mA Analog Input Module Reference Design for Safety Applications
TIDA-00548
Overview
TIDA-00548 is an isolated dual-channel 4- to 20-mA analog input reference design, which can be used as a sub-part for functional safety programmable logic controllers (PLCs). This reference design delivers digitized input values using a 32-bit high-performance analog-to-digital converter (ADC). The RM4x dual-core ARM® Cortex®-R4 based CPU with lockstep technology and built-in self-tests (BIST) compares the converted values of up to nine selectable analog input signal chain paths. The dual-input approach with two separate burden resistors allows redundant measurement of either a single 4- to 20-mA loop or two independent loops. Hercules™ RM ARM Cortex-R based MCUs for functional safety applications help to develop systems according to IEC 61508 SIL 3.
Features
- Two channel 4- to 20-mA current measurement for redundancy with full-scale error less than ±0.01%
- Two ADC references (external and internal)
- Utilizes ADC built-in features such as test DAC, secondary ADC, analog signal level alarm, SPI CRC, timeout and more
- Hercules RM ARM Cortex-R based MCU (for development of IEV 61508 functional safety applications)
- Isolator shutdown upon failure provides reliable notification to backend
- All integrated circuits: MTBF greater 4·10^8
Industrial
- ATMs (Automated Teller Machines)
- Arm based computer on module
- Desktop POS
- Full authority digital engine control (FADEC)
- Industrial robot analog I/O module
- Industrial robot digital I/O module
- Industrial robot ultrasonic
- Mixed module (AI,AO,DI,DO)
- Railway electric propulsion system
- Single board computer
- Stand-alone remote IO
- Standard programmable controller
- Train control & management systems
- Weight module
- X86 based computer on module
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUC03.PDF (1011 K)
Reference design overview and verified performance test data
TIDROH9.PDF (1641 K)
Detailed schematic diagram for design layout and components
TIDROI0.PDF (216 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDROI1.PDF (420 K)
Detailed overview of design layout for component placement
TIDROI3.ZIP (2468 K)
Files used for 3D models or 2D drawings of IC components
TIDCCU9.ZIP (604 K)
Design file that contains information on physical board layer of design PCB
TIDROI2.PDF (3870 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
MOSFETs
CSD18534Q5A — 60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.8 mOhm
Data sheet: PDF | HTMLXOR (exclusive OR) gates
SN74LVC2G86 — 2-ch, 2-input, 1.65-V to 5.5-V XOR (exclusive OR) gates
Data sheet: PDFStart development
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | 4- to 20-mA Analog Input Module for Safety Applications Design Guide | Oct. 24, 2016 |
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Design tools & simulation
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