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Texas Instruments AMC6821SDBQRG4
- Part No.:
- AMC6821SDBQRG4
- Manufacturer:
- Texas Instruments
- Category:
- Thermal Management
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
AMC6821SDBQRG4.pdf
- Description:
- IC TEMP MONTR/PWM FANCTRL 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
AMC6821SDBQRG4 from Texas Instruments is an intelligent temperature monitor and PWM fan controller IC designed for active thermal management in noise- and power-sensitive systems. It integrates local (±2°C accuracy, 0.125°C resolution) and remote diode-based temperature sensing (±2°C at 0°C–90°C), programmable 10Hz–40kHz PWM output (0%–100% duty cycle, 8-bit resolution), SMBus 2.0 interface, and dedicated fault outputs (FAN-FAULT, OVR, THERM). It operates from 2.7V to 5.5V and is used in notebook PCs, telecom equipment, and DLP projectors for autonomous fan speed regulation.
For engineers reviewing the AMC6821SDBQRG4 datasheet, AMC6821SDBQRG4 pinout, AMC6821SDBQRG4 application, or AMC6821SDBQRG4 equivalent, key selection considerations include dual-channel temperature accuracy, auto-closed-loop fan control modes (Temperature-Fan, Software-RPM), series-resistance cancellation for remote diode sensing, SMBALERT interrupt handling, and QSOP-16 package compatibility with space-constrained thermal subsystems.
Technical Context
The AMC6821SDBQRG4 implements a dual-sensor architecture: an on-die bandgap sensor for local ambient measurement and a precision current-source-driven differential input (IN+/IN−) optimized for Pentium M/IV substrate diodes. Its 11-bit ADC employs 32-cycle digital averaging and low-pass signal conditioning to achieve ±2°C remote accuracy across –40°C to +125°C.
Control logic supports three distinct fan regulation modes: Auto Temperature-Fan (standalone closed-loop using user-defined thresholds), Software-RPM (closed-loop tach feedback to maintain target RPM), and Software-DCY (open-loop direct duty-cycle programming). All alarm thresholds (high/low/critical/PSV) are register-configurable via SMBus, with dedicated open-drain outputs (OVR, THERM, FAN-FAULT) for hardware-level system response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Local Temp Accuracy | ±2°C over –25°C to +100°C - ensures reliable board-ambient monitoring without calibration drift. |
| Remote Temp Accuracy | ±2°C over 0°C to +90°C - enables precise CPU/die temperature tracking using standard thermal diodes. |
| PWM Frequency Range | 10Hz to 40kHz (software-selectable) - supports both low-noise audio-range and high-efficiency switching fan drivers. |
| Duty Cycle Resolution | 8-bit (0.39%/step) - provides fine-grained fan speed control for smooth acoustic transitions. |
| SMBus Interface | Standard SMBus 2.0 protocols (Send/Receive/Write/Read Byte/Multiple Bytes) - enables plug-and-play integration with host BMC or EC without custom firmware. |
| Supply Voltage | 2.7V to 5.5V - compatible with 3.3V and 5V system rails, simplifying power domain design. |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature computing environments. |
Pinout & Package
AMC6821SDBQRG4 is housed in a RoHS-compliant QSOP-16 package (4mm × 5mm body, 0.635mm pitch), pin-compatible with SSOP-16 footprints and optimized for thermal performance in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM-OUT (Pin 1) | Open-drain PWM output | Drives external fan MOSFET gate; requires external pull-up; supports 0–100% duty cycle modulation. |
| TACH (Pin 2) | Fan tachometer input | Accepts TTL/CMOS-compatible pulse train from fan's tach output for RPM feedback in Software-RPM mode. |
| OVR (Pin 3) | Over-temperature alert | Active-low open-drain output asserted when local/remote temp ≥ critical limit or remote sensor failure. |
| NC (Pin 4) | No connect | Reserved for factory test; must be left unconnected in application circuitry. |
| GND (Pin 5) | System ground reference | Analog and digital ground return; requires low-impedance connection to minimize measurement noise. |
| VDD (Pin 6) | Power supply input | Accepts 2.7–5.5V; decoupling capacitor (0.1µF) required near pin for ADC stability. |
| THERM (Pin 7) | Fail-safe thermal throttle | Active-low output for CPU clock throttling; also accepts external low signal to force full-speed fan operation. |
| FAN-FAULT (Pin 8) | Fan stall detection | Asserts low when tach signal stops for >1.5s - independent of SMBus communication. |
| IN− (Pin 9) | Remote sensor cathode input | Connects to cathode of external diode; internal bias current prevents ground noise coupling. |
| IN+ (Pin 10) | Remote sensor anode input | Connects to anode of external diode; supports series-resistance cancellation up to ~1Ω. |
| PWM-MODE (Pin 11) | Frequency range select | Low = 1–40kHz (high-frequency); high/floating = 10Hz–94Hz (low-noise mode). |
| A1 (Pin 12) | SMBus address bit 1 | Configures 7-bit slave address at power-up/reset; tied to VDD/GND/NC per Table 2 in datasheet. |
| A0 (Pin 13) | SMBus address bit 0 | Configures 7-bit slave address at power-up/reset; enables up to 9 unique addresses on same SMBus segment. |
| SMBALERT (Pin 14) | SMBus interrupt output | Open-drain alert line supporting ARA protocol; signals LTO/RTO/PSV/OVR events to host controller. |
| SDA (Pin 15) | SMBus data I/O | Bi-directional, open-drain; requires 2.2kΩ pull-up; supports standard SMBus timing (100kHz max). |
| SCLK (Pin 16) | SMBus clock input | Input-only clock line; requires 2.2kΩ pull-up; defines communication timing and register access rate. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Channel Precision Sensing | Simultaneous local (on-chip) and remote (diode) temperature measurement with ±2°C accuracy and 0.125°C resolution - eliminates need for separate thermal ICs. |
| Series Resistance Cancellation | Patented TI algorithm cancels PCB trace resistance effects on remote diode readings, reducing error to <0.0025°C/Ω - removes manual calibration for production boards. |
| Three Fan Control Modes | Auto Temperature-Fan (standalone), Software-RPM (tach-regulated), and Software-DCY (direct duty-cycle) - enables flexible thermal policy implementation across BIOS, EC, or BMC. |
| Dedicated Hardware Fault Outputs | OVR (critical over-temp), FAN-FAULT (stall detection), and THERM (CPU throttle) provide immediate system-level response without software intervention - critical for fail-safe operation. |
| SMBus 2.0 Compliance | Full support for Send/Receive/Write/Read protocols and Alert Response Address (ARA) - ensures interoperability with industry-standard platform management controllers. |
Applications
| Notebook PC Thermal Management | Network Server Fan Control |
|---|---|
Use Scenario: Real-time CPU and chipset temperature monitoring in ultra-thin notebooks where acoustic noise and battery life are constrained. IC Role / Device Role / Timing Role: AMC6821SDBQRG4 acts as autonomous thermal supervisor - reads Pentium M thermal diode, regulates fan via PWM-OUT, and asserts THERM to throttle CPU clock if remote temp exceeds critical limit. Use Value: Enables silent operation below thermal threshold and rapid cooling response above it, extending battery runtime while maintaining safe junction temperatures. | Use Scenario: Multi-fan cooling in 1U rack servers with varying airflow profiles and hot-swappable components. IC Role / Device Role / Timing Role: AMC6821SDBQRG4 serves as distributed fan controller per CPU socket - monitors local ambient and remote CPU die temp, adjusts individual fan speeds via PWM-OUT, and reports faults via SMBALERT to BMC. Use Value: Reduces system-level fan power by 25–40% versus fixed-speed schemes while preventing thermal throttling during burst workloads. |
| Telecom Equipment Cooling | DLP Projector Thermal Protection |
Use Scenario: Fan regulation in carrier-grade routers with wide ambient temperature swings (–40°C to +70°C) and strict MTBF requirements. IC Role / Device Role / Timing Role: AMC6821SDBQRG4 functions as standalone thermal manager - uses Auto Temperature-Fan mode to dynamically adjust fan speed based on FPGA/ASIC junction temp, with OVR triggering hardware shutdown on critical over-temp. Use Value: Eliminates dependency on host processor for thermal safety, ensuring continuous operation even during CPU lockup or firmware crash. | Use Scenario: Lamp and optics thermal control in high-brightness DLP projectors where localized heating degrades image quality and component lifetime. IC Role / Device Role / Timing Role: AMC6821SDBQRG4 monitors lamp housing (local) and DMD chip (remote diode) temps, drives cooling fan via PWM-OUT, and asserts PSV to enter passive cooling during standby. Use Value: Prevents thermal-induced color shift and extends lamp life by maintaining DMD junction below 85°C during sustained operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar intelligent temperature monitoring and PWM fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADT7470ARQZ | Integrated 3-channel tach input, no series-resistance cancellation, ±3°C remote accuracy, 3.0–3.6V only | Requires external RC network for diode compensation; limited to 3.3V systems; lacks THERM pin for direct CPU throttling | Choose ADT7470ARQZ only if multi-tach monitoring is required and voltage rail is strictly 3.3V. |
| LM96163CIMTX | 12-bit ADC, ±1.5°C remote accuracy, 2.7–5.5V, includes VID interface for CPU voltage telemetry | Supports Intel VRD-compliant voltage reporting but adds complexity; no dedicated FAN-FAULT pin | Choose LM96163CIMTX when simultaneous voltage and temperature telemetry is needed for CPU power management. |
Compared with ADT7470ARQZ and LM96163CIMTX, the AMC6821SDBQRG4 delivers superior remote sensing accuracy with built-in series-resistance cancellation, broader supply range, and dedicated hardware outputs (THERM, FAN-FAULT) for fail-safe thermal response - making it optimal for cost-sensitive, reliability-critical embedded thermal subsystems.
Availability
AMC6821SDBQRG4 is available at Aetrix Electronics and suitable for notebook PCs, telecom equipment, and DLP projector designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant thermal management ICs.
Supply support for AMC6821SDBQRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and power management ICs.
The AMC6821SDBQRG4 belongs to TI's intelligent thermal management product line, engineered specifically for autonomous, SMBus-controlled fan regulation in space-constrained, noise-sensitive computing platforms.
FAQ
What is the operating temperature range of the AMC6821SDBQRG4?
The AMC6821SDBQRG4 is specified to operate from –40°C to +125°C ambient temperature. This extended range ensures reliable performance in industrial, telecom, and automotive-adjacent computing environments. The local temperature sensor maintains ±2°C accuracy across –25°C to +100°C, while the remote channel achieves ±2°C accuracy from 0°C to +90°C - critical for CPU thermal monitoring under real-world thermal transients. All electrical characteristics, including PWM frequency stability and SMBus timing, are guaranteed across this full range.
How does the AMC6821SDBQRG4 handle remote temperature sensor series resistance?
The AMC6821SDBQRG4 implements a patented TI series-resistance cancellation technique that actively compensates for PCB trace resistance between the IC and external thermal diode. This reduces measurement error to less than 0.0025°C per ohm of series resistance - far superior to uncompensated solutions. The method requires no user calibration or external components and works automatically during normal operation, ensuring accurate remote temperature readings even with long or narrow PCB traces connecting to the CPU diode.
What fan control modes does the AMC6821SDBQRG4 support?
The AMC6821SDBQRG4 supports three distinct fan control modes: Auto Temperature-Fan (intelligent closed-loop using user-defined temperature thresholds), Software-RPM (closed-loop tach feedback to maintain a target RPM), and Software-DCY (open-loop direct duty-cycle programming). Auto Temperature-Fan mode allows the AMC6821SDBQRG4 to function autonomously without CPU intervention - continuing fan regulation even during system lockup. Each mode is selected via configuration registers over SMBus, enabling flexible thermal policy deployment across BIOS, EC, or BMC firmware.
Does the AMC6821SDBQRG4 have hardware-level fault outputs?
Yes, the AMC6821SDBQRG4 includes three dedicated open-drain hardware fault outputs: OVR (over-temperature critical alert), FAN-FAULT (fan stall detection), and THERM (fail-safe CPU throttle). OVR asserts low when local or remote temperature reaches its critical limit or if the remote sensor fails. FAN-FAULT goes low when no tach pulses are detected for >1.5 seconds. THERM provides a direct hardware interface to throttle CPU clock frequency - all three outputs operate independently of SMBus communication, ensuring fail-safe thermal protection even during firmware crashes or bus failures.
What is the SMBus address configuration method for the AMC6821SDBQRG4?
The AMC6821SDBQRG4 uses pins A0 and A1 to configure its 7-bit SMBus slave address, with nine possible combinations (e.g., A0=GND, A1=GND → 0011000b). These pins are sampled only at power-up or reset, so address changes require cycling power or issuing a software reset. Pull-up or pull-down resistors must be used - floating connections are not recommended. The device supports standard SMBus protocols (Send Byte, Receive Byte, Write Byte, Read Byte) and Alert Response Address (ARA) for multi-device interrupt arbitration, ensuring robust integration into complex platform management architectures.
AMC6821SDBQRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Temperature Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -40°C ~ 125°C
- Accuracy:
- ±2°C
- Topology:
- ADC (Sigma Delta), Comparator, Fan Control, Multiplexer, Register Bank
- Output Type:
- SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
AMC6821SDBQRG4 FAQ
1.How can I place an order for AMC6821SDBQRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for AMC6821SDBQRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AMC6821SDBQRG4 reliable?
The price and inventory of AMC6821SDBQRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AMC6821SDBQRG4 is usually 5 days.
3.What payment methods are accepted for AMC6821SDBQRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AMC6821SDBQRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AMC6821SDBQRG4?
AMC6821SDBQRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AMC6821SDBQRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AMC6821SDBQRG4?
For technical support, including AMC6821SDBQRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AMC6821SDBQRG4 requirements.
6.How does Aetrix verify that AMC6821SDBQRG4 is sourced from the original manufacturer or authorized distributors?
All AMC6821SDBQRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AMC6821SDBQRG4 meets industry standards.
7.What is the process for return or replacement of AMC6821SDBQRG4?
All AMC6821SDBQRG4 units undergo pre-shipment inspection (PSI). If there is an issue with AMC6821SDBQRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AMC6821SDBQRG4 part is unused and in its original packaging.
Return procedure for AMC6821SDBQRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AMC6821SDBQRG4 Tags
-
EMC2101-ACZL-TR
Microchip Technology
-
MCP9844T-BE/MNY
Microchip Technology
-
EMC2101-R-ACZL-TR
Microchip Technology
-
MCP98244T-BE/MNY
Microchip Technology
-
TC670ECHTR
Microchip Technology
-
SE98ATP,547
NXP Semiconductors
-
AMC6821SDBQR
Texas Instruments
-
MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
-
ADT7475ARQZ-REEL
onsemi
-
MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
-
MAX6684ESA+T
Analog Devices Inc./Maxim Integrated
-
MAX6639AEE+
Analog Devices Inc./Maxim Integrated
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