ON Semiconductor Thermal Management Monitors, Controls, & Sensors

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The ON Semiconductor dBCOOL® devices each consist of a thermal monitor and a multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. These devices can drive a fan using either a low or high frequency drive signal, monitor the temperature of up to two remote sensor diodes plus its own internal temperature, and measure and control the speed of up to four fans so that they operate at the lowest possible speed for minimum acoustic noise.

The automatic fan speed control loop optimizes fan speed for a given temperature. The effectiveness of the system's thermal solution can be monitored using the THERM input. These devices also provide critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating. The ADT7473 also has a unique dynamic T_MIN control mode which enables the system thermals/acoustics to be intelligently managed.

• Controls and monitors up to 4 fans
• High and low frequency fan drive signal
• 1 on-chip and 2 remote temperature sensors
• Extended temperature measurement range: up to 191°C
• Automatic fan speed control mode controls system cooling based on measured temperature
• Enhanced acoustic mode dramatically reduces user perception of changing fan speeds
• Thermal protection feature via THERM output
• Monitors performance impact of Intel® Pentium® 4 processor
• Thermal control circuit via THERM input
• 3-wire and 4-wire fan speed measurement
• Limit comparison of all monitored values
• Meets SMBus 2.0 electrical specifications
• Pb-free devices
• Fully RoHS compliant
  

Part Number	Datasheet	Package
ADT7473ARQZ-1R7		QSOP-16
ADT7476ARQZ-REEL		QSOP-24
ADT7475ARQZ-RL7		QSOP-16

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The ADT7462 is a flexible systems monitor IC, suitable for use in a wide variety of applications. It can monitor temperature in up to three remote locations, as well as its ambient temperature. There are up to four PWM outputs, which can be used to control the speed of a cooling fan by varying the % duty cycle of the PWM drive signal applied to the fan. The ADT7462 supports high frequency PWM for 4-wire fans and low frequency PWM for 2-wire and 3-wire fans. Up to eight TACH inputs can be used to measure the speed of 3-wire and 4-wire fans. There are up to 13 voltage-monitoring inputs, ranging from 12V to 0.9V.

The ADT7462 is fully compatible with SMBus 1.1 and SMBus 1.0. The device also includes a THERM I/O and a RESET I/O and is available in a 32-lead LFCSP_VQ. Many of the pins are multi-functional, and five easy configuration options can be set up using the easy configuration register. Users choose the configuration closest to their requirements; then individual pins can be reconfigured after the easy configuration option has been chosen.

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The ADT7485A is a digital temperature sensor and voltage monitor for use in PC applications with Simple Serial Transport (SST) interface. It can monitor its own temperature as well as the temperature of a remote sensor diode. It can also monitor four external voltage channels and its own supply voltage. The ADT7485A is controlled by a single SST bidirectional data line. This device is a fixed-address SST client where the target address is chosen by the state of the address pin, ADD.

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The ADT7461A is a dual-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and thermal management systems. It is pin- and register-compatible with the ADM1032 and ADT7461. A feature of the ADT7461A is series resistance cancellation, where up to 1.5kΩ (typical) of resistance in series with the temperature monitoring diode can be automatically cancelled from the temperature result, allowing noise filtering. The ADT7461A has a configurable ALERT output and an extended, switchable temperature measurement range.

The ADT7461A can measure the temperature of a remote thermal diode accurate to ±1°C and the ambient temperature accurate to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with the ADM1032, but it can be switched to a wider measurement range of -64°C to +191°C. An ALERT output signals when the on-chip or remote temperature is out of range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output, if required.

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The ADT7481 is a 3-channel digital thermometer and under/overtemperature alarm, intended for use in PCs and thermal management systems. It can measure its own ambient temperature or the temperature of two remote thermal diodes. These thermal diodes can be located in a CPU or GPU, or they can be discrete diode connected transistors. The ambient temperature, or the temperature of the remote thermal diode, can be accurately measured to ±1°C. The temperature measurement range defaults to 0°C to +127°C, compatible with ADM1032, but can be switched to a wider measurement range from -64°C to +191°C.

An ALERT output signals when the on-chip or remote temperature is outside the programmed limits. The THERM output is a comparator output that allows, for example, on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output if required.