LTC2997
PIN FUNCTIONS
D+: Diode Sense Current Source. D+ sources the remote
diode sensing current. Connect D+ to the anode of the re-
mote sensor device. It is recommended to connect a 470pF
bypass capacitor between D+ and D–. Larger capacitors
may cause settling time errors (see Typical Performance
Characteristics). If D+ is tied to VCC, the LTC2997 measures
the internal sensor temperature. Tie D+ to VCC if unused.
D–: Diode Sense Current Sink. Connect D– to the cathode
of the remote sensor device. Tie D– to GND for single
wire remote sensing (see Typical Applications) or internal
temperature sensing.
GND: Device Ground.
VCC: Supply Voltage. Bypass this pin to GND with a 0.1μF
(or greater) capacitor. VCC operating range is 2.5V to 5.5V.
VPTAT: VPTAT Voltage Output. The voltage on this pin is
proportional to the sensor’s absolute temperature. VPTAT
can drive a capacitive load of up to 1000pF. For larger
load capacitance, insert 1kΩ between VPTAT and load to
guarantee stability. VPTAT can drive up to ±200μA of load
current. VPTAT is pulled low when the supply voltage goes
below the under voltage lockout threshold.
VREF: Voltage Reference Output. VREF provides a 1.8V
reference voltage. VREF can drive a capacitive load of up
to 1000pF. For larger load capacitance, insert 1kΩ between
VREF and load to guarantee stability. VREF can drive up to
±200μA of load current. Leave VREF open if unused.
Exposed Pad: Exposed pad may be left open or soldered
to GND for better thermal coupling.
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