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LM64 Datasheet Preview

LM64 Datasheet

Remote Diode Temperature Sensor

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LM64
www.ti.com
SNAS207A – MAY 2004 – REVISED MARCH 2013
LM64 ±1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's
Check for Samples: LM64
FEATURES
1
2 Accurately Senses Remote and Local Diode
Temperatures
• Integrated PWM Fan Speed Control Output
• Programmable 8-step Lookup Table for
Quieting Fans
• ALERT and T_Crit Open-drain Outputs
• Tachometer Input for Measuring Fan RPM
• 10 bit Plus Sign Remote Diode Temperature
Data Format, with 0.125°C Resolution
• SMBus 2.0 Compatible Interface, Supports
TIMEOUT
• 5 General Purpose Input/Output pins
• 5 General Purpose Default input pins
• 24-pin WQFN Package
APPLICATIONS
• Computer Processor Thermal Management
• Graphics Processor Thermal Management
• Voltage Regulator Modules
• Electronic Instrumentation
• Power Supplies
• Projectors
KEY SPECIFICATIONS
• Remote Diode Temperature Accuracy
(includes quantization error)
– Ambient Temp
– 30°C to 50°C
– 0°C to 85°C
– Diode Temp
– 120°C to 140°C
– 25°C to 140°C
– Max Error
– ±1.0°C (max)
– ±3.0°C (max)
• Local Temp Accuracy (includes quantization
error)
– Ambient Temp 25°C to 125°C
– Max Error ±3.0°C (max)
• Power Supply Requirements
– Supply DC Voltage 3.0 V to 3.6 V
– Supply DC Current 1.1 mA (typ)
DESCRIPTION
The LM64 is a remote diode temperature sensor with
PWM fan control. The LM64 accurately measures its
own temperature and that of a remote diode. The
LM64 remote temperature accuracy is factory
trimmed for a MMBT3904 diode-connected transistor
with a 16°C offset for high temperatures. TACTUAL
DIODE JUNCTION = TLM64 + 16°C
The LM64 features a PWM, open-drain, fan control
output, 5 GPIO (General Purpose Input/Output) and 5
GPD (General Purpose Default) pins. The 8-step
Lookup Table allows for a non-linear fan speed vs.
temperature transfer function often used to quiet
acoustic fan noise.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2013, Texas Instruments Incorporated




etcTI

LM64 Datasheet Preview

LM64 Datasheet

Remote Diode Temperature Sensor

No Preview Available !

LM64
SNAS207A – MAY 2004 – REVISED MARCH 2013
Connection Diagram
7 6 5432
1
8
T_Crit
9
N/C
10
N/C
11
N/C
12
A0
LM64
13 14 15 16 17 18 19
24
GPD5
23
GPD4
22
GPD3
21
GPD2
20
GPD1
www.ti.com
Figure 1. 24-pin WQFN Package
Pin
Name
1
GPIO1
2
GPIO2
3
GPIO3
4
PWM
5
VDD
6
D+
7
D-
8
T_Crit
9
N/C
10
N/C
11
N/C
12
A0
13
GND
14
ALERT
15
TACH
16
SMBDAT
17
SMBCLK
18
GPIO5
Input/Output
Digital Input/
Open-Drain Output
Digital Input/
Open-Drain Output
Digital Input/
Open-Drain Output
Open-Drain
Digital Output
Power Supply Input
Analog Input
Analog Input
Open-Drain
Digital Output
N/A
N/A
N/A
Digital Input
Ground
Open-Drain
Digital Output
Digital Input
Digital Input/
Open-Drain Output
Digital Input
Digital Input/
Open-Drain Output
Pin Descriptions
Function and Connection
General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is
10 kΩ to VDD.
General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is
10 kΩ to VDD.
General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is
10 kΩ to VDD.
Open-Drain Digital Output. Connect to fan drive circuitry. The power-on default for this
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
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
must be connected between pins 6 and 7.
Connect to the cathode (negative side) of the remote diode. A 2.2 nF ceramic capacitor
must be connected between pins 6 and 7.
Open-Drain Digital Output. Typical pull-up resistor is 3 kΩ to VDD.
No Connection.
No Connection.
No Connection.
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.
This is the analog and digital ground return.
This pin is an open-drain ALERT Output. Typical pull-up resistor is 3 kΩ to VDD.
This pin is a digital tachometer input. Typical pull-up resistor is 3 kΩ to VDD.
This is the bi-directional SMBus data line. Typical pull-up resistor is 1.5 kΩ to VDD.
This is the SMBus clock input. Typical pull-up resistor is 1.5 kΩ to VDD.
General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is
10 kΩ to VDD.
2
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Product Folder Links: LM64
Copyright © 2004–2013, Texas Instruments Incorporated


Part Number LM64
Description Remote Diode Temperature Sensor
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