LM64 datasheet(2/38 Pages) TI1

2 / 38 page

GPD5

GPD4

GPD3

T_Crit

N/C

GPD2

GPD1

LM64

SNAS207A – MAY 2004 – REVISED MARCH 2013

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Connection Diagram

Figure 1. 24-pin WQFN Package

Pin Descriptions

Name

Input/Output

Function and Connection

Digital Input/

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

GPIO1

Open-Drain Output

10 k

Ω to VDD.

Digital Input/

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

GPIO2

Open-Drain Output

10 k

Ω to VDD.

Digital Input/

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

GPIO3

Open-Drain Output

10 k

Ω to VDD.

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).

Connect to a low-noise +3.3 ± 0.3 VDC power supply, and bypass to GND with a 0.1

VDD

Power Supply Input

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 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 6 and 7.

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

D-

Analog Input

must be connected between pins 6 and 7.

Open-Drain

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

Ω to VDD.

T_Crit

Digital Output

N/C

N/A

No Connection.

N/C

N/A

No Connection.

N/C

N/A

No Connection.

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

Digital Input

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

Ω to VDD.

GND

Ground

This is the analog and digital ground return.

Open-Drain

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

Ω to VDD.

ALERT

Digital Output

TACH

Digital Input

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

Ω to VDD.

Digital Input/

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

Ω to VDD.

SMBDAT

Open-Drain Output

SMBCLK

Digital Input

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

Ω to VDD.

Digital Input/

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

GPIO5

Open-Drain Output

10 k

Ω to VDD.

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