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4 Pin Configuration and Functions

GPD5

GPD4

GPD3

T_Crit

N/C

GPD2

GPD1

LM64

Figure 4-1. 24-pin WQFN Package

Table 4-1. 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 kΩ to VDD.

GPIO2

Digital Input/

Open-Drain Output

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

10 kΩ to VDD.

GPIO3

Digital Input/

Open-Drain Output

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

10 kΩ to VDD.

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).

VDD

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 VDD 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 kΩ to VDD.

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 kΩ to VDD.

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 kΩ to VDD.

TACH

Digital Input

This pin is a digital tachometer input. Typical pull-up resistor is 3 kΩ to VDD.

SMBDAT

Digital Input/

Open-Drain Output

This is the bi-directional SMBus data line. Typical pull-up resistor is 1.5 kΩ to VDD.

SMBCLK

Digital Input

This is the SMBus clock input. Typical pull-up resistor is 1.5 kΩ to VDD.

GPIO5

Digital Input/

Open-Drain Output

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

10 kΩ to VDD.

www.ti.com

LM64

SNAS207B – MAY 2004 – REVISED JANUARY 2024

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