NCN5192

NCN5192 HART Modem Description The NCN5192 is a single−chip, CMOS modem for use in highway addressable remote transducer (HART) field instruments and masters. The modem and a few external passive components provide all of the functions needed to satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect, and transmit−signal shaping. In addition, the NCN5192 also has an integrated DAC for low-BOM current loop slave transmitter implementation. The NCN5192 uses phase continuous frequency shift keying (FSK) at 1200 bits per second. To conserve power the receive circuits are disabled during transmit operations and vice versa. This provides the half−duplex operation used in HART communications. Features Single−chip, Half−duplex 1200 Bits per Second FSK Modem Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz 3.0 V − 5.5 V Power Supply Transmit−signal Wave Shaping Receive Band−pass Filter Low Power: Optimal for Intrinsically Safe Applications Compatible with 3.3 V or 5 V Microcontroller Internal Oscillator Requires 460.8 kHz, 920 kHz or 1.8 MHz Crystal or Ceramic Resonator SPI Communication Integrated 16 bit Sigma-Delta DAC Meets HART Physical Layer Requirements Industrial Temperature Range of −40°C to +85°C Available in 32−pin NQFP Package These are Pb−Free Devices Applications HART Multiplexers HART Modem Interfaces 4 − 20 mA Loop Powered Transmitters www.onsemi.com MARKING DIAGRAM 1 32 QFN32 C...