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Automatic meter reading,
or AMR, is a rapidly growing sector of the metering
industry.
It is a host-driven, multi-level network consisting
of a Host Central Station (HCS), Data Concentrator Units
(DCU) and Meter Interfacing Units (MIU).
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AMR system architecture block diagram
ST7538 internal block diagram. Click here
to enlarge
ST7538P the Newest
PLM From ST |
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The ST7538P, incorporates, a Frequency Shifting Key (FSK), modulation
/ demodulation circuitry and a very low distortion, high-current power
line driver. These are all aimed at helping reduce the part count,
board space and overall time to market. The modem can be integrated
into an existing static meter main board, by connecting it to a few
general purpose I/Os of the microcontroller and to the Power Line,
through an inexpensive coupling network. While meeting the requirements
set by international regulation bodies, such as CENELEC for Electro
Magnetic Compatibility, the ST7538 offers a broad range of settings
to fit the specific requirements of the Physical and Media Access
Control -MAC- layer being used. This makes it suitable for a wide
variety of industry standards as well as proprietary protocols.
 Half duplex Frequency Shift Keying (FSK) transceiver;
Integrated power line driver with programmable
voltage and current control;
Synchronous or asynchronous microcontroller interface;
Single 7.5 to 12.5V supply voltage;
Very low power consumption (Iq=5mA);
Integrated 5V, 100mA short circuit protected voltage
regulators;
8 programmable transmission frequencies;
Programmable BAUD rate from 600 to 4800BPS;
Receiver sensitivity 1mVRMS;
Carrier or preamble detection;
Band-in-use detection;
Programmable register with security checksum;
Line voltage zero crossing detection and synchronization;
Watchdog timer;
10x10x1.4mm TQFP44 with copper slug package.
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