Datasheet

Table Of Contents

LM63

SNAS190E –SEPTEMBER 2002–REVISED MAY 2013

www.ti.com

KEY SPECIFICATIONS

• Remote Diode Temp Accuracy (with quantization error)

Ambient Temp Diode Temp I

PWML

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

PIN NAME INPUT/OUTPUT FUNCTION AND CONNECTION

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

1 V

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 V

pin.

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

2 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

3 D− 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

4 PWM

Digital Output pin is low (pin 4 pulled to ground).

5 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

6 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/

7 SMBDAT This is the bi-directional SMBus data line.

Open-Drain Output

8 SMBCLK Digital Input Digital Input. This is the SMBus clock input.

Product Folder Links: LM63