LM64 datasheet(2/29 Pages) NSC

2 / 29 page

Pin Descriptions

Name

Input/Output

Function and Connection

GPIO1

Digital Input/

Open-Drain Output

General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up

resistor is 10 k

Ω to V

DD.

GPIO2

Digital Input/

Open-Drain Output

General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up

resistor is 10 k

Ω to V

DD.

GPIO3

Digital Input/

Open-Drain Output

General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up

resistor is 10 k

Ω to V

DD.

PWM

Open-Drain

Digital Output

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

default for this pin is low (pin 4 pulled to ground).

Power Supply Input

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

with a 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 LM64’s V

pin.

D+

Analog Input

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

capacitor must be connected between pins 6 and 7.

D-

Analog Input

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

ceramic capacitor must be connected between pins 6 and 7.

T_Crit

Open-Drain

Digital Output

Open-Drain Digital Output. Typical pull-up resistor is 3 k

Ω to V

DD.

N/C

N/A

No Connection.

N/C

N/A

No Connection.

N/C

N/A

No Connection.

Digital Input

SMBus Address Select pin. If High, the SMBus address is 0x4E or, if Low,

the SMBus address is 0x18. Typical pull-up resistor is 10 k

Ω to V

DD.

GND

Ground

This is the analog and digital ground return.

ALERT

Open-Drain

Digital Output

This pin is an open-drain ALERT Output. Typical pull-up resistor is 3 k

Ω to

DD.

TACH

Digital Input

This pin is a digital tachometer input. Typical pull-up resistor is 3 k

Ω to

DD.

SMBDAT

Digital Input/

Open-Drain Output

This is the bi-directional SMBus data line. Typical pull-up resistor is 1.5 k

Ω

to V

DD.

SMBCLK

Digital Input

This is the SMBus clock input. Typical pull-up resistor is 1.5 k

Ω to V

DD.

GPIO5

Digital Input/

Open-Drain Output

General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up

resistor is 10 k

Ω to V

DD.

GPIO4

Digital Input/

Open-Drain Output

General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up

resistor is 10 k

Ω to V

DD.

GPD1

Digital Input

General Purpose Default Input Pin. Typical pull-up resistor is 10 k

Ω to V

DD.

Always connect to a logical High or Low level.

GPD2

Digital Input

General Purpose Default Input Pin. Typical pull-up resistor is 10 k

Ω to V

DD.

Always connect to a logical High or Low level.

GPD3

Digital Input

General Purpose Default Input Pin. Typical pull-up resistor is 10 k

Ω to V

DD.

Always connect to a logical High or Low level.

GPD4

Digital Input

General Purpose Default Input Pin. Typical pull-up resistor is 10 k

Ω to V

DD.

Always connect to a logical High or Low level.

GPD5

Digital Input

General Purpose Default Input Pin. Typical pull-up resistor is 10 k

Ω to V

DD.

Always connect to a logical High or Low level.

LM64 Datasheet(PDF) 2 Page - National Semiconductor (TI)

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