HT2015 Datasheet | Smar Research

Smar Research Technology Source HART® Fieldbus Profibus Intrinsic Safety Configuration Tools Semiconductors Training Custom Design HART Modem Features - Can be used in designs presently using the SYM20C15 or equivalent type chip - Single-chip, half-duplex 1200 bits per second FSK modem - Bell 202 shift frequencies of 1200 Hz and 2200 Hz - 3.3V-5.0V power supply - Transmit-signal wave shaping - Receive band-pass filter - Low power: optimal for intrinsically safe applications - CMOS patible - Internal oscillator requires 460.8 k Hz crystal or ceramic resonator - Meets HART physical layer requirements - Industrial temperature range of -40 °C to +85 °C - Available in a 28-pin PLCC and 32-pin LQFP packages (LQFP pictured) ©Smar Research Corporation 1 HT2015DS - 0303 HT2015 General Description General Description The HT2015 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 ponents provide all of the functions needed to satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect and transmit-signal shaping. The HT2015 is pin-patible with the SYM20C15. See the Pin Description and Functional Description sections for details on pin patibility with the SYM20C15. The HT2015 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 munications. Fig. 1 - 28 pin PLCC Pinout Package Fig. 2 - 32 pin LQFP Pinout...