DAC8740H Series
HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant modem with UART interface
Manufacturer: Texas Instruments
Catalog
HART®, FOUNDATION Fieldbus™, and PROFIBUS PA-compliant modem with UART interface
Key Features
• HART-compliant physical layer modem1200-Hz, 2200-Hz HART FSK sinusoidsRegister programmable amplitude of TX signals (DAC8741H only)Integrated RX demodulator and band-pass filter with minimal external componentsFOUNDATION Fieldbus compatible H1 controller and medium attachment unit (MAU)31.25 kbit/s communication based on Manchester-coded bus powered (MBP)Integrated Manchester encoder and decoderCompatible with PROFIBUS PALow quiescent current: 180 µA max at typical industrial operating temperature range (–40°C to +85°C)Integrated 1.5-V referenceFlexible clocking optionsInternal oscillatorExternal crystal oscillatorExternal CMOS clockDigital interfaceDAC8740H: UARTDAC8741H: SPIReliability: CRC bit error checking, watchdog timer (DAC8741H only)Wide operating temperature: –55°C to +125°C4-mm × 4-mm QFN packageHART-compliant physical layer modem1200-Hz, 2200-Hz HART FSK sinusoidsRegister programmable amplitude of TX signals (DAC8741H only)Integrated RX demodulator and band-pass filter with minimal external componentsFOUNDATION Fieldbus compatible H1 controller and medium attachment unit (MAU)31.25 kbit/s communication based on Manchester-coded bus powered (MBP)Integrated Manchester encoder and decoderCompatible with PROFIBUS PALow quiescent current: 180 µA max at typical industrial operating temperature range (–40°C to +85°C)Integrated 1.5-V referenceFlexible clocking optionsInternal oscillatorExternal crystal oscillatorExternal CMOS clockDigital interfaceDAC8740H: UARTDAC8741H: SPIReliability: CRC bit error checking, watchdog timer (DAC8741H only)Wide operating temperature: –55°C to +125°C4-mm × 4-mm QFN package
Description
AI
The DAC8740H and DAC8741H (DAC874xH) are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low-power modems designed for industrial process control and industrial-automation applications.
In HART mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex HART physical layer modems, in either slave or master configurations with minimal external components for filtering. In FOUNDATION Fieldbus mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex FOUNDATION Fieldbus compatible H1 controllers and MAUs.
The HART, FOUNDATION Fieldbus, or PROFIBUS PA, data stream can be transferred from the microcontroller through either a UART interface or an integrated FIFO accessed by a SPI interface. The SPI interface includes an SDO pin for daisy-chain support, various interrupts, and other extended features.
The DAC8740H and DAC8741H (DAC874xH) are HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low-power modems designed for industrial process control and industrial-automation applications.
In HART mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex HART physical layer modems, in either slave or master configurations with minimal external components for filtering. In FOUNDATION Fieldbus mode, the DAC874xH integrates all of the required circuitry to operate as half-duplex FOUNDATION Fieldbus compatible H1 controllers and MAUs.
The HART, FOUNDATION Fieldbus, or PROFIBUS PA, data stream can be transferred from the microcontroller through either a UART interface or an integrated FIFO accessed by a SPI interface. The SPI interface includes an SDO pin for daisy-chain support, various interrupts, and other extended features.
