TATTLETALE 8 ENHANCEMENT PRODUCTS

(Tattletale is a registered trademark of Onset Computer Corporation)

The Tattletale line of micropower datalogger/controllers from Onset Computer Corporation is at the heart of many of Brightwater's products. The Brightwaters Tattletale 8 Baseboard is an expansion board for Onset's most powerful datalogger, the Tattletale Model 8. The TT8 baseboard provides a number of hardware capabilities useful in logging applications: Extended supply voltage range: 7.5 to 28 volts for systems using TT8 baseboard versus 7-15 volts for Model 8 alone. Especially useful for battery operated systems. Watchdog circuit resets Tattletale in case of program crash or lockup. Manual reset button. Main and backup power inputs. Main power allows 1 to 3 sources (battery packs, DC supplies, etc.) to power Tattletale and external hardware, backup power input powers Tattletale only. Your program can use the supply voltage measuring circuits (see below) to sense the main power failure and drop the Tattletale to its lowest power mode. Under these circumstances a 9 volt transistor battery as the backup power can preserve logged data for many months.

• Supply voltage measuring circuits for main and backup supplies with switched resistor ladders - zero current draw when not measuring. The switching circuit for the main supply voltage check can also be used to supply a small amount of power (50 mA) to external device.
• Piezo buzzer and driver circuit. Buzzer has 90dB output and can be heard clearly through a closed pressure case. Quieter buzzers are available for the faint of heart :-)
• Termination resistors for digital I/O lines.
• Optional external A/D reference.
• Digital input multiplexer and output demultiplexer/latch expands existing and buffers Tattletale digital I/O lines. Buffer chips are socketed - make a mistake and you replace a $2 IC instead of sending a $400 Tattletale back for repair.
• Lines brought to 40 pin header at end of board, allowing easy connection to additional boards using 40 conductor ribbon cable and inexpensive insulation displacement connectors.
• Baseboard is 6.5 x 2.5 inches (16.5 cm x 6.3 cm) in size, high quality glass epoxy, two-sided, solder masked board with plated through holes. . Tattletale 8 and baseboard sandwiched together fit into 3 inch PVC tube with room to spare.
• Every effort has been made to make the additions robust and minimize power consumption. Individual baseboard circuit blocks can be disabled to further reduce power if needed.

        The Tattletale 8 baseboard is designed to help you get your application up and running quickly and reliably, whether you need a single unit for a research application or OEM quantities. Substantial discounts are available for large quantity purchases, or we will be happy to discuss licensing all or part of the design.

        For more information on this product, contact Brightwaters.

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