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Technical Specifications
Parameters and characteristics for this part
| Specification | AMC6821SDBQRG4 |
|---|---|
| Accuracy | 2 °C |
| Function | Temperature Monitor |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Alarm | True |
| Output Fan | True |
| Output Type | SMBus |
| Package / Case | 0.154 in |
| Package / Case | 16-SSOP |
| Package / Case | 3.9 mm |
| Sensing Temperature [Max] | 125 °C |
| Sensing Temperature [Min] | -40 °C |
| Sensor Type | Internal and External |
| Supplier Device Package | 16-SSOP |
| Topology | Comparator, Multiplexer, Fan Control, ADC (Sigma Delta), Register Bank |
| Voltage - Supply [Max] | 5.5 V |
| Voltage - Supply [Min] | 2.7 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 2500 | $ 1.87 | |
Description
General part information
AMC6821-Q1 Series
The AMC6821-Q1 is an intelligent temperature monitor and pulse-width modulation (PWM) fan controller. It is designed for noise-sensitive or power-sensitive applications that require active system cooling. Using either a low-frequency or a high-frequency PWM signal, this device can simultaneously drive a fan, monitor remote sensor diode temperatures, and measure and control the fan speed so that it operates with minimal acoustic noise at the lowest possible speed.
The AMC6821-Q1 has three fan control modes: Auto Temperature-Fan mode, Software-RPM mode, and Software-DCY mode. Each mode controls the fan speed by changing the duty cycle of a PWM output. Auto Temperature-Fan mode is an intelligent, closed-loop control that optimizes fan speed according to user-defined parameters. This mode allows the AMC6821-Q1 to run as a stand-alone device without CPU intervention; the fan can continue to be controlled (based on temperature measurements) even if the CPU or system locks up. Software-RPM mode is a second closed-loop control. In this mode, the AMC6821-Q1 adjusts the PWM output to maintain a consistent fan speed at a user-specified target value; that is, the device functions as a fan speed regulator. Software-RPM mode can also be used to allow the AMC6821-Q1 to operate as a stand-alone device. The third mode, Software-DCY, is open-loop. In Software-DCY mode, the PWM duty cycle is set directly by the value written to the device.
The AMC6821-Q1 has a programmableSMBALERToutput to indicate error conditions and a dedicatedFAN-FAULToutput to indicate fan failure. TheTHERMpin is a fail-safe output for over-temperature conditions that can be used to throttle a CPU clock. Additionally, theOVRpin indicates the over-temperature limit as well. All of the alarm thresholds are set through the device registers. The AMC6821-Q1 is available in a SSOP-16 package.
Documents
Technical documentation and resources
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