文档介绍：译文原文题目: A5191HRT AMIS HART ? Modem 译文题目: A5191HRT 型 HART 调制解调器学院: 电子信息学院专业班级: 自动化 2009 级 04班学生姓名: 学号: 40905010435 西安工程大学本科毕业设计(译文) 1 A5191HRT AMIS HART ? Modem 1. Features Can be used in designs presently using the SYM20C15 Single-chip, half-duplex 1200 bits per second FSK modem Bell 202 shift frequencies of 1200Hz and 2200Hz - power supply Transmit-signal wave shaping Receive band-pass filter Low power: optimal for intrinsically safe applications patible Internal oscillator requires crystal or ceramic resonator Meets HART physical layer requirements Industrial temperature range of -40 °C to +85 °C Available in 28-pin and 32-pin LQFP packages 2. Description The A5191HRT isa single-chip, CMOS modem for use in highway addressable remote transducer (HART) field instruments and masters. The modem and a few external ponents provide allof the functions needed to satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect, and transmit-signal shaping. The A5191HRT is patible with the SYM20C15. See the Pin Description and Functional Description sections for details on patibility with the SYM20C15. The A5191HRT uses phase continuous frequency shift keying (FSK) at1200 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 munications . 西安工程大学本科毕业设计(译文) 2 Figure 2-1 28-Pin Pinout Diagrams (green & non-green) Figure 2-2 32-Pin LQFP Pinout Diagrams (green & non-green) Table 2-1 Pinout Summary 28-Pin , A5191HRTP/Pg (12197-504/508) Pin N0. Signal Name Type Pin description 1 TEST1 Input Connect toV SS 2 TEST2 - No connect 3 TEST3 - No connect 4 TEST4 - No connect 5 TEST5 Input Connect toV SS 6 INRESET Input Reset all digital logic when low 7 TEST7 Input Connect toV SS 8 TEST8 Input Connect toV SS 9 TEST9 Input Connect toV SS 10 OTXA Output Output transmit analog, FSK modulated HART transmit signal to 4-20mA