DEMO MANUAL DC1871A LTC2995 Temperature Sensor and Dual Voltage Monitor with Alert Outputs DESCRIPTION Demonstration circuit 1871A features the LTC2995, a high cations analog and digital signals to measure performance. performance temperature and voltage monitor that has Design files for this circuit board are available at resistor configurable alert levels. DEMO MANUAL DC1871A QUICK START PROCEDURE Jumper Settings Analog Connections DS: This jumper allows the user to set the LTC2995 to use the Analog signal connections are made via the row of turret internal temp sensor, an external temp sensor, or alternate posts along the edge of the board. between the two choices. When set to INT&EXT, VPTAT GND: (6 turrets)These turrets are connected directly to changes every 3.5ms from the voltage corresponding to the internal ground planes. the temperature of the internal sensor to the voltage cor- V : User should connect a 2.25V to 5.5V power supply responding to the temperature of the external temperature. CC to this turret. PS: This jumper selects the polarity of the VT1/VT2 pins. V : This is set up to be a 5V 10% monitor input. This, Depending on the position of this jumper, the VT1 and VT2 IN1 however, can be adjusted by changing the VH1/VL1 resis- pins can either be used to indicate OT or UT. tors (RA1, RB1, RC1). Please refer to the LTC2995 manual PS VT1 VT2 for resistor value formulas. V UT OT CC V : This is setup to be a 12V 10% monitor input. This, IN2 Open OT OT however, can be adjusted by changing the VH2/VL2 resis- GND UT UT tors (RA2, RB2, RC2). Please refer to the LTC2995 manual for resistor value formulas. DIODE SELECT: Allows the user to either select the on V : OUTPUT ONLY. This nominally outputs 1.8V that can REF board FMMT3904 (Q1) or attach their own diode through drive up to 200A of load. the D+/D turrets. VPTAT: The voltage on this turret is proportional to the LED ON/OFF: Turns on or off the digital indicator lights sensors absolute temperature, with a slope of 4mV/k. that reflect the status of OV, UV, TO2, TO1. VPTAT can drive up to a 200A load and up to 1000pF capacitive load. dc1871af 2