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
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 is a single-chip, CMOS modem for use in highway addressable remote transducer (HART) field instruments and masters. The modem and a few external 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 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) 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 munications.
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 to VSS
2
TEST2
-
No connect
3
TEST3
-
No connect
4
TEST4
-
No connect
5
TEST5
Input
Connect to VSS
6
INRESET
Input
Reset all digital logic when low
7
TEST7
Input
Connect to VSS
8
TEST8
Input
Connect to VSS
9
TEST9
Input
Connect to VSS
10
OTXA
Output
Output transmit analog, FSK mod