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Details, datasheet, quote on part number:LM64CILQX-F
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Datasheet text preview:
LM64 ± 1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's
December 2003
LM64 ± 1°C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO's
General 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 diodeconnected 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.
Key Specifications
n 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)
n Local Temp Accuracy (includes quantization error) Ambient Temp 25°C to 125°C n Power Supply Requirements Max Error
± 3.0°C (max)
Features
n n n n n n n n n n 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 LLP package
Supply DC Voltage Supply DC Current
3.0 V to 3.6 V 1.1 mA (typ)
Applications
n n n n n n Computer Processor Thermal Management Graphics Processor Thermal Management Voltage Regulator Modules Electronic Instrumentation Power Supplies Projectors
Connection Diagram
20065501
© 2003 National Semiconductor Corporation
DS200655
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LM64
Pin Descriptions
Pin 1 2 3 4 Name GPIO1 GPIO2 GPIO3 PWM Input/Output Digital Input/ Open-Drain Output Digital Input/ Open-Drain Output Digital Input/ Open-Drain Output Open-Drain Digital Output Function and Connection General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is 10 k to VDD. General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is 10 k to VDD. General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is 10 k 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 k 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 k to VDD. This is the analog and digital ground return. This pin is an open-drain ALERT Output. Typical pull-up resistor is 3 k to VDD. This pin is a digital tachometer input. Typical pull-up resistor is 3 k to VDD. This is the bi-directional SMBus data line. Typical pull-up resistor is 1.5 k to VDD. This is the SMBus clock input. Typical pull-up resistor is 1.5 k to VDD. General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is 10 k to VDD. General Purpose Open-Drain Digital Output or Digital Input. Typical pull-up resistor is 10 k to VDD. General Purpose Default Input Pin. Typical pull-up resistor is 10 k to VDD. Always connect to a logical High or Low level. General Purpose Default Input Pin. Typical pull-up resistor is 10 k to VDD. Always connect to a logical High or Low level. General Purpose Default Input Pin. Typical pull-up resistor is 10 k to VDD. Always connect to a logical High or Low level. General Purpose Default Input Pin. Typical pull-up resistor is 10 k to VDD. Always connect to a logical High or Low level. General Purpose Default Input Pin. Typical pull-up resistor is 10 k to VDD. Always connect to a logical High or Low level.
5
VDD
Power Supply Input
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
D+ DT_Crit N/C N/C N/C A0 GND ALERT TACH SMBDAT SMBCLK GPIO5 GPIO4 GPD1 GPD2 GPD3 GPD4 GPD5
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 Digital Input/ Open-Drain Output Digital Input Digital Input Digital Input Digital Input Digital Input
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LM64
Simplified Block Diagram
20065502
Ordering Information
Part Description LM64 24-pin LLP LM64 24-pin LLP LM64 Evaluation Board With Software and Manual Order Number LM64CILQ-F LM64CILQX-F LM64EVAL Top Mark 64CILQF 64CILQF N/A Transport Media 1000 Units in Tape and Reel 4500 Units in Tape and Reel Packaged
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