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Analog Devices Inc. ADM1026JST
- Part No.:
- ADM1026JST
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 48-LQFP
- Datasheet:
-
ADM1026JST.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
ADM1026JST from onsemi is a complete thermal system management controller IC for microprocessor-based systems, providing 19 analog measurement channels (including internal temperature sensor and dual remote diode inputs), 8 fan tachometer inputs, 17 general-purpose logic I/O pins, SMBus 1.1 interface with PEC, and 8 kB on-chip EEPROM. It delivers hardware monitoring for server power supplies (+3.3 V, +5 V, ±12 V, VCCP, VBAT), chassis intrusion detection, and dual-mode fan control (PWM and DAC) in a 48-lead LQFP package.
For engineers reviewing the ADM1026JST datasheet, ADM1026JST pinout, ADM1026JST application, or ADM1026JST equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and voltage monitoring specs, real-world application mappings for telecom and server platforms, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The ADM1026JST integrates an 8-bit successive-approximation ADC with programmable input attenuators and multiplexing to support simultaneous monitoring of 15 analog voltage inputs (0 V–3.0 V or 0 V–2.5 V ranges), two remote diode temperature sensors, and its on-die bandgap sensor - all sampled at up to 11.38 ms per channel. Its SMBus 1.1 slave interface uses a hardwired 7-bit address (default 0x5C) with ADD/NTESTOUT pin controlling LSBs and supports packet error checking.
It implements autonomous fan speed measurement via eight dedicated tachometer inputs with configurable divisors (1/2/4/8), generates active-low reset pulses (RESETMAIN/RESETSTBY, 180 ms typ) tied to 3.3 V MAIN/STBY thresholds, and provides dual fan control outputs: open-drain 75 Hz PWM (Pin 18) and 0 V–2.5 V 8-bit DAC (Pin 23), both programmable via register writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Measurement Channels | 19 total: 15 analog voltage inputs (including +3.3 V, +5 V, ±12 V, VCCP, VBAT), 2 remote diode temp inputs, 1 on-die temp sensor |
| Fan Inputs | 8 dedicated tachometer inputs (FAN0–FAN7), each with internal 10 kΩ pullup to 3.3 V STBY; reconfigurable as GPIO |
| Logic I/O Pins | 17 total: 8 GPIO-only (Pins 1, 2, 43–48), 8 fan/GPIO dual-mode (Pins 3–6, 9–12), 1 THERM/GPIO (Pin 42) |
| ADC Performance | 8-bit SAR ADC; ±2.0% total unadjusted error; 11.38 ms conversion time for analog/internal temp; 34.13 ms for remote diode |
| Temperature Accuracy | ±3.0°C for internal sensor and remote diodes (0°C–100°C); ±1.0°C resolution |
| SMBus Interface | Full SMBus 1.1 compliance including Packet Error Checking (PEC); 400 kHz max clock; 7-bit slave address (default 0x5C) |
| EEPROM | 8 kB non-volatile memory (0x8000–0x9FFF); 100,000 write cycles endurance; 10-year data retention at TJ = 55°C |
| Supply & Reset | Powered by 3.3 V STBY; RESETSTBY/RESETMAIN assert 180 ms low pulses when respective rails fall below 3.05 V / 2.94 V thresholds |
Pinout & Package
ADM1026JST is housed in a 48-lead LQFP (Leadless Quad Flat Package), case 932, with 0.5 mm pitch and exposed thermal pad. Package dimensions and soldering profiles comply with JEDEC MS-026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (GPIO9) | Digital I/O | Open-drain general-purpose I/O requiring external pullup; configured via GPIO registers |
| Pin 3 (FAN0/GPIO0) | Fan Tachometer Input | Internal 10 kΩ pullup to 3.3 V STBY; measures fan RPM; reconfigurable as open-drain GPIO |
| Pin 13 (SCL) | SMBus Clock Input | Open-drain input requiring 2.2 kΩ external pullup; defines serial bus timing |
| Pin 17 (INT) | Interrupt Output | Open-drain SMBAlert signal; asserts low on out-of-limit events; internal 100 kΩ pullup |
| Pin 18 (PWM) | Fan Speed Control | Open-drain 75 Hz PWM output; default 100% duty cycle; invertable for PMOS drive |
| Pin 23 (DAC) | Analog Fan Control | 0 V–2.5 V 8-bit DAC output; used for linear fan voltage control or analog feedback |
| Pin 25 (D1–) | Remote Temp Input | Cathode connection for first external diode sensor; 0 V–2.5 V input range |
| Pin 42 (GPIO16/THERM) | Thermal Interrupt I/O | Bidirectional pin; functions as active-low thermal interrupt or open-drain GPIO |
Key Features
| Feature | Design Value |
|---|---|
| 19-channel analog monitoring | Supports full server rail monitoring (+3.3 V, +5 V, ±12 V, VCCP, VBAT) plus 8 general-purpose inputs and dual remote diode sensing |
| Dual-mode fan control | Simultaneous PWM (75 Hz, open-drain) and DAC (0–2.5 V) outputs enable flexible thermal management strategies |
| Chassis intrusion detection | Dedicated CI input (Pin 16) latches tamper event in battery-backed register, persisting across power cycles |
| On-chip EEPROM | 8 kB non-volatile storage for configuration, calibration, or system logs; survives power loss and enables field updates |
| Auto-reset generation | Two independent reset outputs (RESETMAIN/RESETSTBY) with precise 2.94 V / 3.05 V thresholds and 180 ms pulse width |
| SMBus 1.1 with PEC | Hardware-level packet error checking ensures robust communication in noisy server environments |
Applications
| Server Power Supply Monitoring | Telecom Equipment Thermal Management |
|---|---|
Use Scenario: Real-time tracking of +3.3 V, +5 V, ±12 V, and VCCP rails in dual-CPU rack servers during load transients and thermal stress testing. IC Role / Device Role / Timing Role: Hardware monitor IC performing autonomous analog sampling, limit comparison, and interrupt generation without CPU intervention. Use Value: Enables early fault detection before rail collapse; reduces system downtime by triggering alerts at ±5% deviation from nominal values. |
Use Scenario: Continuous thermal supervision of FPGA, DSP, and power amplifier modules in 4G/LTE base station cabinets with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Dual remote diode sensor interface with ±3.0°C accuracy, feeding temperature data to fan control loops. Use Value: Maintains junction temperatures within safe limits using DAC-controlled fans, extending component lifetime by >30% under sustained load. |
| Industrial PC Chassis Security | Test Equipment Calibration Storage |
Use Scenario: Tamper-evident enclosure monitoring in medical imaging PCs where unauthorized access must be logged and reported at boot. IC Role / Device Role / Timing Role: Chassis intrusion detector with battery-backed status register (CI input on Pin 16) retaining state across AC power loss. Use Value: Provides auditable security event history without external non-volatile memory, meeting IEC 62304 Class C requirements. |
Use Scenario: Storing factory calibration coefficients and user-defined alarm thresholds in automated test equipment requiring recalibration every 6 months. IC Role / Device Role / Timing Role: 8 kB on-chip EEPROM used for persistent parameter storage, accessed via SMBus without external memory chips. Use Value: Eliminates BOM cost and PCB area for external EEPROM; guarantees 10-year data retention at 55°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal management controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM95235CIMMX | 2-channel remote diode sensor only; no VCCP/VBAT monitoring; 12-bit ADC; no integrated EEPROM or reset outputs | Limited to dual-processor thermal monitoring; lacks power rail supervision and system reset capability | Select when only high-resolution temperature sensing is required and SMBus EEPROM storage is handled externally |
| MAX6642AESA+ | Single remote diode + on-die sensor only; no analog voltage inputs; no fan tachometer or PWM/DAC outputs | Designed for compact thermal-only nodes; cannot replace ADM1026JST in full-system monitoring roles | Choose for space-constrained embedded designs needing only local + remote temperature with SMBus alert |
Compared with LM95235CIMMX and MAX6642AESA+, the ADM1026JST uniquely integrates voltage monitoring, fan control, reset generation, and 8 kB EEPROM in one device - eliminating need for 3–4 discrete ICs in server motherboard BOMs while enabling autonomous fault response.
Availability
ADM1026JST is available at Aetrix Electronics and suitable for network servers, telecommunications infrastructure, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.
Supply support for ADM1026JST 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The ADM1026JST belongs to onsemi's System Management Controller product line, designed specifically for comprehensive hardware monitoring in high-reliability computing platforms where thermal integrity, power rail stability, and physical security are mission-critical.
FAQ
What is the function of Pin 42 (GPIO16/THERM) on the ADM1026JST?
Pin 42 serves as a bidirectional thermal interrupt (THERM) pin with internal 100 kΩ pullup, or as an open-drain general-purpose I/O. When configured as THERM, it asserts low upon exceeding a programmed temperature threshold - a feature directly supported in ADM1026JST's interrupt mask and status registers. This dual functionality is confirmed in the Pin Assignment table and Functional Description section of the official datasheet.
Does the ADM1026JST support SMBus Packet Error Checking (PEC)?
Yes, the ADM1026JST fully supports SMBus 1.1 including Packet Error Checking (PEC). This is explicitly stated in the FEATURES list and verified in the Electrical Characteristics table under "SERIAL BUS TIMING" parameters. PEC ensures data integrity during SMBus transactions - critical for reliable monitoring in electrically noisy server environments where ADM1026JST is deployed.
What is the maximum number of analog voltage inputs the ADM1026JST can monitor simultaneously?
The ADM1026JST supports up to 15 dedicated analog voltage inputs: five fixed-purpose inputs (+3.3 V MAIN, +5 VIN, −12 VIN, +12 VIN, +VCCP), one VBAT input, and eight general-purpose inputs (AIN0–AIN7) with selectable 0 V–2.5 V or 0 V–3.0 V ranges. This count is confirmed in the "Functional Description" section and Pin Assignment table of the ADM1026JST datasheet.
Can the ADM1026JST measure negative voltages, and if so, which pins support this?
Yes, the ADM1026JST supports negative voltage measurement exclusively on Pin 31 (−12 VIN), with a specified input resistance of 8.0–12 kΩ and absolute rating of −20 V. No other analog input pins accept negative voltages - all others (e.g., AIN0–AIN7, +5 VIN, VCCP) are limited to 0 V minimum. This capability is documented in the Absolute Maximum Ratings and Electrical Characteristics tables for ADM1026JST.
What is the purpose of the 8 kB EEPROM in the ADM1026JST, and how is it accessed?
The 8 kB EEPROM (addresses 0x8000–0x9FFF) in the ADM1026JST stores non-volatile configuration, calibration data, or system logs. It is accessed identically to volatile registers via SMBus - using the same address pointer mechanism - but requires erase-before-write and exhibits slower write timing. Endurance is rated at 100,000 cycles and retention at 10 years (TJ = 55°C), as verified in the EEPROM Reliability section of the ADM1026JST datasheet.
ADM1026JST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Hardware Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 100°C
- Accuracy:
- ±3°C(Max)
- Topology:
- ADC, Comparator, Multiplexer, Register Bank
- Output Type:
- SMBus
- Output Alarm:
- No
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- 0°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
ADM1026JST FAQ
1.How can I place an order for ADM1026JST through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1026JST 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 ADM1026JST reliable?
The price and inventory of ADM1026JST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1026JST is usually 5 days.
3.What payment methods are accepted for ADM1026JST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1026JST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1026JST?
ADM1026JST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1026JST 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 ADM1026JST?
For technical support, including ADM1026JST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1026JST requirements.
6.How does Aetrix verify that ADM1026JST is sourced from the original manufacturer or authorized distributors?
All ADM1026JST 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 ADM1026JST meets industry standards.
7.What is the process for return or replacement of ADM1026JST?
All ADM1026JST units undergo pre-shipment inspection (PSI). If there is an issue with ADM1026JST, 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 ADM1026JST part is unused and in its original packaging.
Return procedure for ADM1026JST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM1026JST 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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