LTC2995

7

2995f

PIN FUNCTIONS

mote sensor device. It is recommended to connect a 470pF

may cause settling time errors (see Typical Performance

wire remote temperature measurement (see Applications

Information) or internal temperature sensing.

DS: Diode Select Input. Three state pin that selects tem-

temperature of the internal diode or to GND to monitor the

temperature of the external diode. When DS is left uncon-

nected, the LTC2995 monitors both sensors alternately.

sensor temperature regardless of the state of DS.

Exposed Pad: Exposed pad may be left open or soldered

to GND for better thermal coupling.

GND: Device Ground

OV: Overvoltage Logic Output. Open drain logic output

that pulls to GND when either the voltage at VL1 or VL2

is above 0.5V. Held low for a programmable delay time

set by the capacitor connected to pin TMR. OV has a weak

an external pull-up. Leave OV open if unused.

PS: Polarity Select Input. Selects the polarity of tempera-

ure VT1 as undertemperature and VT2 as overtemperature

threshold. Leave PS unconnected to configure both VT1

and VT2 as overtemperature thresholds. Connect PS to

GND to configure both VT1 and VT2 as undertemperature

TMR: Reset Delay Timer. Attach an external capacitor

(CTMR) to GND to set the delay time until alerts on TO1,

TO2, UV and OV are reset. Leaving the pin open generates

a minimum delay of 500μs. Capacitance on this pin adds

bypass the timer.

TO1: Temperature Logic Output 1. Open drain logic output

on pin VT1 with a polarity set by the PS pin (see Table 3

threshold voltage on pin VT1 with opposite polarity, an

additional hysteresis of 20mV is required to release TO1

high after a delay adjustable by the capacitor on TMR. TO1

TO2: Temperature Logic Output 2. Open drain logic output

on pin VT2 with a polarity set by the PS pin (see Table 3

threshold voltage on pin VT2 with opposite polarity, an

additional hysteresis of 20mV is required to release TO2

high after a delay adjustable by the capacitor on TMR. TO2

UV: Undervoltage Logic Output. Open drain logic output

that pulls to GND when either the voltage at VH1 or VH2

is below 0.5V. Held low for an adjustable delay time set

by the capacitor connected to pin TMR. UV has a weak

an external pull-up. Leave pin open if unused.

VH1, VH2: Voltage High Inputs 1 and 2. When the voltage

on either pin is below 0.5V, an undervoltage condition is

VL1, VL2: Voltage Low Inputs 1 and 2. When the voltage

on either pin is above 0.5V, an overvoltage condition is

triggered. Tie pin to GND if unused.

Output. The voltage on this pin is proportional to the

selected sensor’s absolute temperature. An internal or

drive up to ±200μA of load current and up to 1000pF of

capacitive load. For larger load capacitances insert a 1k