Packaging information
| Package | Pins SSOP (DBQ) | 16 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 2,500 | LARGE T&R |
Features for the AMC6821-Q1
- Qualified for automotive applications:
- Junction temperature: –40°C to +150°C, TJ
- Functional Safety-Capable
- Remote temperature sensor: ±3°C accuracy, 0.250°C resolution
- Local temperature sensor: ±3°C accuracy, 0.250°C resolution
- PWM controller
- PWM frequency: 10 Hz to 40 kHz
- Duty cycle: 0% to 100%, 8 bits
- Automatic fan speed control loops
- SMBus interface
- Power: 2.7 V to 5.5 V
- Package (green): SSOP-16 (4mm × 5mm)
- RoHS-compliant
- Latch-up exceeds 100 mA per JESD78B - class I
Description for the AMC6821-Q1
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 programmable SMBALERT output to indicate error conditions and a dedicated FAN-FAULT output to indicate fan failure. The THERM pin is a fail-safe output for over-temperature conditions that can be used to throttle a CPU clock. Additionally, the OVR pin 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.