LM63 datasheet(2/41 Pages) TI1

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LM63

SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

www.ti.com

KEY SPECIFICATIONS

•

Remote Diode Temp Accuracy (with quantization error)

Ambient Temp

Diode Temp

IPWML Max

Version

Max Error

30 to 50°C

60 to 100°C

5 mA

LM63C

±1.0°C

30 to 50°C

60 to 100°C

5 mA

LM63D

±3.0°C

0 to 85°C

25 to 125°C

8 mA

All

±3.0°C

•

Local Temp Accuracy (includes quantization error)

Ambient Temp

Max Error

25°C to 125°C

±3.0°C

•

Supply Voltage: 3.0 V to 3.6 V

•

Supply Current: 1.3 mA (typ)

PIN DESCRIPTIONS

NAME

INPUT/OUTPUT

FUNCTION AND CONNECTION

Connect to a low-noise +3.3 ± 0.3 VDC power supply, and bypass to GND with a

VDD

Power Supply Input

0.1 µF ceramic capacitor in parallel with a 100 pF ceramic capacitor. A bulk

capacitance of 10 µF needs to be in the vicinity of the LM63's VDD pin.

Connect to the anode (positive side) of the remote diode. A 2.2 nF ceramic capacitor

D+

Analog Input

must be connected between pins 2 and 3.

Connect to the cathode (negative side) of the remote diode. A 2.2 nF ceramic capacitor

−

Analog Input

must be connected between pins 2 and 3.

Open-Drain

Open-Drain Digital Output. Connect to fan drive circuitry. The power-on default for this

PWM

Digital Output

pin is low (pin 4 pulled to ground).

GND

Ground

This is the analog and digital ground return.

Depending on how the LM63 is programmed, this pin is either an open-drain ALERT

ALERT/TACH

Digital I/O

output or a tachometer input for measuring fan speed. The power-on default for this pin

is the ALERT function.

Digital Input/

SMBDAT

This is the bi-directional SMBus data line.

Open-Drain Output

SMBCLK

Digital Input

Digital Input. This is the SMBus clock input.

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