LTC2996
pin FuncTions
+
+
D : Diode Sense Current Source. D sources the remote
OT:OvertemperatureLogicOutput.Opendrainlogicoutput
thatpullstoGNDwhenV isabovethethresholdvoltage
+
diode sensing current. Connect D to the anode of the re-
PTAT
motesensordevice.Itisrecommendedtoconnecta470pF
on pin VTH. When V
falls below the threshold voltage
PTAT
+
–
bypass capacitor between D and D . Larger capacitors
on pin VTH, an additional hysteresis of 20mV is required
may cause settling time errors (see Typical Performance
to release OT high. OT has a weak 400kΩ pull-up to V
CC
+
Characteristics).IfD istiedtoV ,theLTC2996measures
and may be pulled above V using an external pull-up.
CC
CC
+
the internal sensor temperature. Tie D to V if unused.
Leave OT open if unused.
CC
–
–
D : Diode Sense Current Sink. Connect D to the cathode
V
:ProportionaltoAbsoluteTemperatureVoltageOut-
PTAT
–
of the remote sensor device. Tie D to GND for single
wire remote temperature measurement (see Applications
Information) or internal temperature sensing.
put. The voltage on this pin is proportional to the sensor’s
absolute temperature. V can drive up to 200μA of
PTAT
loadcurrentandupto1000pFofcapacitiveload.Forlarger
load capacitances insert 1kΩ between V and the load
to ensure stability. V
voltage goes below the under voltage lockout threshold.
PTAT
Exposed Pad: Exposed pad may be left open or soldered
to GND for better thermal coupling.
is pulled low when the supply
PTAT
GND: Device Ground
V
: Voltage Reference Output. V provides a 1.8V
REF
REF
UT: Undertemperature Logic Output. Open drain logic
reference voltage. V
can drive up to 200μA of load
REF
outputthatpullstoGNDwhenV
voltage on pin VTL. When V
isbelowthethreshold
rises above the threshold
current and up to 1000pF of capacitive load. For larger
PTAT
PTAT
load capacitances, insert 1kΩ between V and the load
REF
voltage on pin VTL, an additional hysteresis of 20mV is
to ensure stability. Leave V
open if unused.
REF
required to release UT high. UT has a weak 400kΩ pull-
VTL: Temperature Threshold Low. When V
is below
PTAT
up to V and may be pulled above V using an external
CC
CC
the voltage on VTL, UT is pulled low. Tie VTL to GND if
pull-up. Leave UT open if unused.
unused.
VTH: Temperature Threshold High. When V
is above
PTAT
the voltage on VTH, OT is pulled low. Tie VTH to V if
CC
unused.
2996f
6
Linear [ Linear ]
