LP3500 Low-Power Single-Board Computer

Models LP3500, LP3510

Description

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.

Features

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

Panel-Mount
Keypad/Display Unit

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.

LP3500 Specifications

Features	LP3500	LP3510
Microprocessor	Low-EMI Rabbit 3000T @ up to 7.4 MHz
Flash	512K (2 x 256K)	256K
SRAM	512K	128K
Backup Battery	Socketed 3 V lithium coin-type, 265 mA·h, supports RTC and SRAM
Keypad/Display	Optional keypad/display module with 7 keys and 122 × 32 graphic display, easy to use menuing software
Digital Inputs	16 protected to ±36 V DC
Digital Outputs	10 total: 8 sink and 2 source 200 mA each, 36 V DC max.
Relay	1 C-form, 1 A, 30 V DC	None
Analog Inputs	General Eight single-ended or four differential inputs 1MΩ input impedance Sampling rate up to 200 samples/sec Eight software-controlled volatege ranges from 0-1 V to 0-20V Single-Ended Resolution: 11 bits (8 bit accuracy) 4 channels can be set individually for 4-20mA with plug-in jumpers 1 channel has software-selectable voltage-monitoring option Differential Resolution: 12 bits (9 bit accuracy)	None
Analog Outputs	3 unfiltered PWM, 1 kΩ output impedance	None
Serial Ports	6 total: 1 RS-485 3 RS-232 (three 3-wire OR one 5-wire and one 3-wire) 1 logic-level serial interface for optional add-ons 1 3 V CMOS-compatible (programming)
Serial Rate	Max. asynchronous baud rate = CLK/8
Real-Time Clock	Yes
Timers	Ten 8-bit timers (6 cascadable from the first) and one 10-bit timer with 2 match registers
Watchdog/Supervisor	Yes
Main Power	3-30 V DC, 20 mA max. @ 7.4 MHz, 100 µA max. @ 2 kHz
Backup Power	Used to reduce current in power-save mode, 2.7-3.3 V @ 100µA max
Operating Temp.	-40°C to +70°C
Humidity	5-95%, noncondensing
I/O Connectors	Two 1 × 17, 0.1" pitch headers
Board Size	3.65" × 2.60" × 0.45" (93 mm × 66 mm × 11 mm)
Part Number	20-101-0525	20-101-0526
Starter Package	20-101-0525, 101-0530	20-101-0526, 101-0530

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