Digi ConnectCore System-on-Modules Single Board Computers Development kits

Rabbit® SBC LP3500 Series


Single-Board Computer

  • Low power consumption less than 100 uA in power save mode
  • 8 A/D inputs with 12 bit resolution
  • Digital outputs can sink up to 200 mA
  • 6 serial ports for multiple device connectivity
  • 16 protected digital inputs

The LP3500 features built-in analog and digital I/O which also includes 1 high current relay output capable of driving up to 1A. The board consumes less than 20 mA when fully operational and less than 100 uA when powered down. When powered by an external battery or power supply, the LP3500 series can be awakened from power save mode by an internal timer, an RS-232 signal or via polling on an external input. The LP3500 can be switched from power save mode to full operation via software control. In addition to the lowpower features, the board can also function as a data logger since the battery backup feature provides worry free data storage.

Its 6 serial ports enable the LP3500 series to easily connect multiple devices such as Digi’s XStream® 2.4 GHz RF modem, which can send and receive data up to 20 miles. Dynamic C®, an easy-to-use C environment, includes a host of sample programs and libraries that help to lower development costs and reduce time to market from months to weeks.

The LP3500 is a low-power single-board computer designed to operate reliably virtually any place it is deployed, especially where power is limited, such as in portable, hand-held, battery-powered, and remote monitoring systems. The LP3500 features built-in analog and digital I/O and consumes less than 20 mA when fully operational and less than 100 µA in power-save mode.

  • Power-save mode draws <100 µA
  • Low operating consumption: <20 mA at 7.4 MHz
  • 26 industrialized I/O + 1 relay
  • 8 A/D converter inputs w/ programmable gain
  • 6 serial ports (1 RS-485, 3 RS-232, 2 TTL)
  • Optional keypad/display, serial Flash, peripherals

The LP3500 incorporates the low-EMI Rabbit® 3000 microprocessor, up to 512K each of Flash and SRAM, 26 industrialized digital I/O, A/D converter inputs and PWM outputs, 6 serial ports, one relay, and two dedicated function ports for easy connection to serial Flash, keypad/display, and other devices. (The LP3510 is a lower-cost model without A/D or relay features). The LP3500 runs at up to 7.4 MHz at a variety of power levels under software control, thereby accommodating a wide range of operating conditions. The board is equipped with 0.1" connectors, and users can supply their own cables or plug the SBC directly into sockets on their motherboard.

The LP3500 can be used for remote telemetry (RTUs), pipeline monitoring, GPS/asset tracking, handheld wireless devices, remote data acquisition, electrical transmission line monitoring, and other applications that require low power control. An optional 3.3 V keypad/display module is available as a convenient user interface, which can be made NEMA 4-compliant when panel mounted.

A socketed coin-type battery facilitates long-term data storage (SRAM) and RTC operation. When powered by an external battery or power supply (3-30 V DC), the unit can be awakened from the power-save mode by an internal timer, an RS-232 signal, or via polling of an external input. The LP3500 can be switched from power-save mode to full operation and back again via software control. In addition, various sections of circuitry (e.g., RS-232 ports) can be switched off via software control to further conserve power when not in use.

The LP3500 can be mounted to a panel or plastic mounting base that allows I/O connections via traditional connectors with 0.1-inch spacing, or it can be inverted and directly mounted to mating connectors on a customer-designed motherboard. The first approach is appropriate where I/O connections go directly to devices and switches, while the second method is suitable where additional circuitry is incorporated on the motherboard.

Programming the LP3500 Single-Board Computer

Programs are developed for the LP3500 using Rabbit's industry-proven Dynamic C® software development system. An extensive library of drivers and demo programs is also provided. Both LP3500 models can be programmed and debugged over Ethernet/Internet using appropriate accessory hardware.

Product Type LP3500 LP3510
Microprocessor Rabbit® 3000 up to 7.4 MHz
EMI Reduction Spectrum spreader for ultra-low EMI (radiated emissions)
Flash Memory 512K (2 × 256K) 256K
SRAM 512K 128K
Backup Battery Socketed 3V lithium coin Panasonic® CR2330, 265 mA·h, supports RTC and SRAM, connection for user-supplied external battery
Keypad/Display Supports optional LCD/keypad module with 7 keys and 122 × 32 graphic display
Digital Inputs 16: fully protected 0–36VDC, can handle short spikes ±40V
Digital Outputs 10: 8 sink up to 200 mA each, 36VDC max.; 2 source up to 200 mA each, 36VDC max.
Relay Output 1 C-form, 1A, 30VDC None
Analog Inputs General
  • Eight single-ended or four differential inputs
  • 1MΩ input impedance
  • Sampling rate up to 200 samples/s
  • Eight software-controlled ranges from 0–1V to 0–20VDC
  • Resolution: 11 bits (8-bit accuracy)
  • 4 channels can be set individually for 4-20 mA
  • 1 channel has software-selectable voltage-monitoring option
Resolution: 12 bits (9-bit accuracy)
Analog Outputs 3 unfiltered pulse-width modulated, 1 kΩ output impedance None
Serial Ports 6 shared high-speed, CMOS-compatible ports:
  • 1 RS-485
  • 3 RS-232 (one 5-wire plus one 3-wire or three 3-wire)
  • 1 logic-level serial interface for optional add-ons
  • 1 asynchronous clocked serial port dedicated for programming
Serial Rate Max. asynchronous baud rate = CLK/8
Real-Time Clock Yes
Timers Ten 8-bit timers (6 cascadable from the first), one 10-bit timer with 2 match registers
Watchdog/Supervisor Yes
Pulse-Width Modulators 10-bit free-running counter and 4 pulse-width registers
Power 3V to 30VDC 20 mA (max.) @ 7.4 MHz, 100 μA max. @ 2 kHz (with linear regulator turned off)
Operating Temperature 0°C to +70°C
Humidity 5 to 95%, non-condensing
Connectors 0.1" headers
  • I/O and misc. signals: one 1 × 25, two 1 × 17 headers
  • Display: one 2 × 13 header
2 mm headers
  • Programming port: one 2 × 5 header
  • Serial interface: one 2 × 4 socket
Screw-terminal headers
  • Relay: one 3- position screw-terminal header
Board Size 2.60” × 3.65” × 0.45” (66 mm × 93 mm × 11 mm)
Product Warranty 1 year

Recently Viewed