DATA SHEET - Micro-485
The Micro-485's socketed 80C51FA CPU is ideally suited to control applications, and includes the following key features:
DIGITAL I/O CAPABILITY: 27 total TTL/CMOS compatible digital I/O lines are available. All lines include input protection resistors, and the 11 available CPU I/O lines also include PNP transistors that boost the CPU's current sink capability to 50mA per pin.
SERIAL COMMUNICATIONS: Supports RS-485/422 serial communications that may be configured as a single full-duplex RS-422 port or as dual independent RS-485 channels, for long distance communications or networking applications. Can also be used with RS-232 serial ports.
ANALOG SIGNAL INPUTS: The on-board 4 channel, 12-bit A/D can convert 0 - 5 volt input signals from various sensors in less that 15 microseconds. The Burr-Brown autocalibrating ADC has an internal sample and hold, and a total unadjusted error of ± 1/2 LSB.
EPROM MEMORY: The resident BlueEarth BASIC and MONITOR-51 programs are contained in the on-board socketed 32K byte CMOS EPROM. The Micro-485 can also be configured to use a 64K byte EPROM.
NONVOLATILE RAM MEMORY: 128K bytes of battery backed CMOS RAM can be used to store the user's programs (BASIC and/or assembly language), system parameters, and collected data. The CPU accesses the RAM as two individual 64K byte banks.
EEPROM: The 1K-bit serial EEPROM can be used to store important parameters and system configuration data.
TIMEKEEPING MODULE: Time and date based operations are managed by the battery backed clock/calendar module. It features a 12/24 hour format, software data protect, alarm output, and interrupt output with periods ranging from 1/1024 second through ten minutes.
POWER SUPPLY: An external regulated 5 volt power supply or almost any 7 - 15 volt filtered DC source may be used to power the Micro-485. An internal lithium backup battery maintains RAM data and clock operation for 10+ years.
LOW POWER OPERATION: Typical operating current is 45 mA. In addition to the CPU's Idle and Power Down modes, the clock/calendar's alarm output can be used to gate the system's power for a "zero-power" mode. The switched power is also available on the Micro's I/O connector for controlling power to external peripherals.
PLD ADDRESS DECODER: All address decoding is done by a socketed low power PLD. The PLD also does the bank switching for the 128K RAM. The system code and data memory maps can be modified by simple PLD equation changes.
Case dimensions, not including connector: 2.44" W x 2.94" H x 0.75" D.
BlueEarth reserves the right to change product features and specifications without notice.
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©1999-2002 BlueEarth, LLC. Last Updated September 3, 2002
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