DEMO MANUAL DC2507A LTC2986 and LTC2986-1 Input Protected Universal Temperature Measurement System on a Chip Description Demonstration circuit DC2507A is a resistive protection input channels are isolated from the terminal block by a network designed to interface the LTC 2986 demonstration 2.4k, 1W protection resistor, while the complementing boards (DC2508 for LTC2986 or DC2618 for LTC2986-1). DC2508 contains 100pF filtering capacitors. As a refer- The LTC2986 is a pin and software compatible 10-chan- ence, the DC2507A includes a top level hookup diagram nel version of the 20-channel LTC2983. The LTC2986 for each sensor type, see Figure 1. includes several new modes enabling external protection/ The DC2507A requires a DC2531 or DC2608 kit. These kits filtering resistors for 2-/3-/4-wire RTDs, thermistors, and contain the LTC2986 motherboard (DC2508 or DC2618) thermocouples. The DC2507A includes a universal input and a Linduino One (DC2026) USB interface board. 4-input terminal block, front end protection/filtering resis- Additionally, QuikEval software is used to program tors, and a interface for connecting to the DC2508/DC2618 the LTC2986 channel assignment data and display the demonstration circuit. temperature results. The 4-input terminal block (J1) can directly interface to a Design files for this circuit board are available at single 2-/3-/4-wire RTD, or a thermistor, or a thermocouple DEMO MANUAL DC2507A s Global Parameters Setup In order to run the LTC2986 in the universally protected mode, all 3 kelvin mode global variables need to be set, see Figure 2. Note, these variables are not available with the LTC2983 and LTC2984. The LTC2986 will automati- cally determine the current mode based on the sensor type and/or the number of sensor wires. Figure 2. Setting Global Kelvin Mode dc2507af 2 etup