Packaging information
| Package | Pins WQFN (NHW) | 24 |
| Operating temperature range (°C) 0 to 125 |
| Package qty | Carrier 1,000 | SMALL T&R |
Features for the LM64
- 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
- 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)
- Ambient Temp
- 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)
- Remote Diode Temperature
Accuracy (includes quantization error)
Description for the LM64
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.