TERN DataWatch NEC V25 16 bit CPU [x86 compatible]  8MHZ C/C++ Programmable Controller, 4 channels 12-bit DAC, 14 solenoid drivers, 11 12-bit ADC, 2 RS232 and 1 RS485, LCD interface

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Industrial controller with 96 field-removable screw terminals, ADC, DAC, I/Os

As of 2003, this product is being discontinued as NEC has ended production on the NEC-V25.  Limited inventories for prior customers available.   

Please see TD-40 as a possible replacement.

DataWatch Specs/Features:
* Measures 6.7x6.7x0.7 inches
* 16-bit CPU (NEC V25), x86 compatible

* 8 MHz system clock
* Power consumption: 180 mA at 9V
* Low power version: 75 mA, 20 mA standby
* Temperature: -40 to +85 Celsius
* Up to 512 KB Flash/EPROM

* Up to 512 KB battery-backed SRAM
* 512-byte EEPROM
* 14 solenoid drivers and 8 TTL I/Os driven by PPI
* 11 12-bit ADC
* 4 channels 12-bit DAC
* 24x4 field-removeable screw terminals
* Two RS-232 and one RS-485
* LCD Interface

The DataWatch™ (DW) is a low-cost, 16-bit C/C++ programmable industrial controller based on the NEC V25 processor. The DW supports up to 512 KB ROM/Flash, 512 KB battery-backed SRAM, a 512-byte EEPROM, a real-time clock (RTC72421), up to three serial ports, three 16-bit timers/counters, TTL I/O lines, 14 solenoid drivers, power failure reset, watchdog, and 24x4 field-removable screw terminals. 12-bit ADC, DAC, and a 16x2 character LCD interface are also available.

The DW is designed for industrial and field applications that demand mobility. The 96 (24x4) optional field-removable screw terminals of the DW allow a unit to be placed and removed without disconnecting individual wires, which relieves the constant hassle of swapping, moving, and upgrading a system. This feature saves time and minimizes disastrous cross-wiring. The factory default configuration provides fixed terminals, if the optional field-removable terminals are not needed.

At the 24x4 screw terminals, the DW provides 16 TTL inputs, 8 comparator inputs, 14 solenoid drivers, and 8 bi-directional TTL I/Os with LED indicators.

The 16 TTL inputs are buffered by two PALs and can be configured as multiplexed events counter inputs, external interrupt inputs or digital inputs. An on-board PPI (82C55) drives 14 solenoid drivers and 8 bi-directional TTL I/Os. Eight resistor-protected comparators can be used to measure either digital or analog inputs (0 to 10V) in 16 levels.

An optional 11 resistor-protected 12-bit ADC inputs and four 12-bit DAC outputs can be installed on the DW. The ADC (TLC2543) features reference inputs (2.5V or 5V), a sample rate of up to 2.5 kHz, and a 0-10V input voltage range. The DAC (MAX537) outputs 0V to 2.5V, with a typical slew rate of 3V/s with a 5 kW load. The DAC is installed with a 2.5V precision reference (20 ppm/ C, LT1009).

The 14 solenoid drivers can sink up to 350 mA each at 50V.

Two RS-232 serial ports support up to 115,200 baud. One optional UART (SCC2691) supports 8-bit/9-bit RS-485 networking. Two standby modes, HALT and STOP, can reduce power consumption. A 16-pin LCD interface header supports various types of LCDs.


Ordering Information (Qty 1/100/1K+)

Includes NEC V25, 2 RS-232, 3 timers, comparators, 14 solenoid drivers, 8 I/Os from 82C55 PPI, watchdog, LCD interface, 512-byte EEPROM, and 24x4 FIXED screw terminals. Does not include add-on options. OEM option discounts available.

Add-on Options:

1) SRAM: 32KB/128KB/512KB    $8/$15/$40
2) Debug ROM (TDREM_V25) $30
3) Real-time clock and battery $20
4) Low-power version $25
5) UART (SCC2691) and RS-485 driver $30
6) 11 ch. 12-bit ADC $30
7) 4 ch. 12-bit DAC (MAX 537) w/ 2.5V reference $80
8) 24x4 field-removable screw terminals $80

Development Service: Testech Electronics provides cost effective development service for a full turnkey solutions to assist our customer with automating or customised  project using Tern controller. We help you to implement your ideas and solve your problem quickly. Contact us at sales@testech-elect.com or call +65-67492162 for a discussion on how you can speed up your projects.



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