DAC8742H Texas instruments

DAC8742H

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DAC8742H

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Описание

The DAC8742H is a HART®, FOUNDATION Fieldbus™, and PROFIBUS PA compatible low power modem designed for industrial process control and industrial automation applications. In HART mode, the DAC8742H 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 DAC8742H 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.

HART-Compliant Physical Layer Modem
- 1200/2200 Hz HART FSK Sinusoids
- Register Programmable Amplitude of TX Signals
  (DAC8741H / DAC8742H only)
- Integrated RX Demodulator and Band-Pass Filter with Minimal External Components
FOUNDATION 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 Decoder
- Compatible with PROFIBUS PA
Low Quiescent Current: 180 uA Max at Typical Industrial Operating Temperature Range (-40°C to 85°C)
Integrated 1.5-V Reference
Flexible Clocking Options
- Internal Oscillator
- External Crystal Oscillator
- External CMOS Clock
Digital Interface
- DAC8742H: UART and SPI
Reliability: CRC Bit Error Checking, Watchdog Timer
Wide Operating Temperature: –55°C to 125°C
5 mm x 5 mm TQFP Package

Interface type	SPI, UART
Features	FOUNDATION Fieldbus MAU, HART Modem, Low Power, Profibus PA Modem
Reference type	Ext, Int
Rating	Catalog
Output range (max) (mA/V)	0.5
Output range (min) (mA/V)	0
Operating temperature range (°C)	-55 to 125