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Analog Devices Inc. AD7314ARM
- Part No.:
- AD7314ARM
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7314ARM.pdf
- Description:
- IC SENSOR TEMP 10BIT DGTL 8-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,178
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Product details
Overview
AD7314ARM from Analog Devices is a low-voltage, 10-bit digital temperature sensor IC with integrated band gap sensor and successive-approximation ADC, delivering ±2°C accuracy over –35°C to +85°C, 0.25°C resolution, SPI-/DSP-compatible serial interface, and shutdown mode consuming ≤1 mA - used for ambient temperature monitoring in PC motherboards and hard disk drive thermal management.
For engineers reviewing the AD7314ARM datasheet, AD7314ARM pinout, AD7314ARM application, or AD7314ARM equivalent, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for thermal sensing in space-constrained embedded systems.
Technical Context
The AD7314ARM implements an on-chip band gap temperature sensor paired with a 10-bit successive-approximation ADC, generating twos-complement digital output (DB9–DB0) representing temperature from –128°C to +127°C (practically limited to –35°C to +85°C). Conversion is auto-triggered every 400 ms, completing in 25 ms, with result stored in a read-only temperature value register.
Its SPI-compatible 4-wire serial interface (CE, SCLK, SDI, SDO) supports both read (temperature data) and write (control register, including power-down bit) operations; CE enables SCLK, and the ID pin (Pin 7) features a 1 kΩ internal pull-down for device identification in multi-sensor buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Range | –35°C to +85°C operating range - defines usable ambient environment for reliable thermal monitoring without derating. |
| Accuracy | ±2°C at VDD = 2.65 V–2.9 V; ±1°C at VDD = 3 V–5.5 V - directly impacts system thermal safety margin and fan control precision. |
| Resolution | 10-bit (0.25°C LSB) - enables fine-grained thermal trending and threshold detection in closed-loop systems. |
| Supply Voltage | 2.65 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level-shifting. |
| Supply Current | 1 mA active conversion current (VDD ≥ 3 V); ≤1 mA shutdown current - enables battery-backed or low-power always-on thermal logging. |
| Interface Protocol | SPI/QSPI/MICROWIRE/DSP-compatible 4-wire serial - ensures drop-in integration with 80C51, PIC16Cxx, 68HC11, and common DSPs. |
| Update Rate | One conversion per 400 ms - balances measurement latency and power consumption for non-critical thermal surveillance. |
Pinout & Package
AD7314ARM is housed in an 8-lead MSOP (RM-8) package, 3.0 mm × 3.0 mm footprint, 0.65 mm lead pitch, with exposed pad not electrically connected. Pin 1 is NC (no connect), simplifying layout by eliminating routing conflict at corner position.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad - must remain unconnected to avoid parasitic coupling or ESD path disruption. |
| 2 (CE) | Chip Enable Input | Active-high enable for serial interface; disables SCLK when low - essential for bus arbitration in multi-device SPI configurations. |
| 3 (SCLK) | Serial Clock Input | Asynchronous master-provided clock; rising edge updates SDO, falling edge latches SDI - timing-critical for reliable register access. |
| 4 (GND) | Analog & Digital Ground | Single ground reference for ADC and digital logic - requires low-impedance PCB connection to minimize noise-induced temperature error. |
| 5 (SDO) | Serial Data Output | Three-state open-drain output; driven only when CE is high - allows wired-OR bus sharing with other SDO lines. |
| 6 (SDI) | Serial Data Input | Loads control register bits (e.g., power-down bit at position 3) - must be stable before 15th SCLK rising edge for valid register update. |
| 7 (ID) | Device Identification | Internally pulled down (1 kΩ); readable by master to confirm presence - enables firmware-level device enumeration without I²C address conflicts. |
| 8 (VDD) | Positive Supply | Power input for analog/digital circuitry; requires 0.1 µF ceramic decoupling to GND - critical for ADC stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip band gap temperature sensor | Enables direct ambient temperature measurement without external thermistors or calibration components - reduces BOM count and layout area. |
| Auto-conversion mode (400 ms period) | Eliminates need for external timer or polling loop - simplifies firmware and guarantees consistent thermal sampling intervals. |
| Shutdown mode (≤1 mA) | Reduces power by >99% vs. active mode - extends battery life in portable diagnostics or maintenance-free sensor nodes. |
| Twos-complement 10-bit output format | Provides signed integer representation directly usable by microcontrollers without software sign extension or scaling. |
| ID pin with internal 1 kΩ pull-down | Allows hardware-based device identification in shared SPI buses - prevents misreads when multiple AD7314ARM units share CE/SCLK/SDO lines. |
Applications
| Hard Disk Drive Thermal Monitoring | PC Motherboard Ambient Sensing |
|---|---|
Use Scenario: Real-time tracking of HDD enclosure temperature to prevent thermal throttling or head crash during sustained write operations. IC Role / Device Role / Timing Role: Primary ambient temperature sensor feeding thermal management firmware; sampled every 400 ms to balance responsiveness and power. Use Value: ±2°C accuracy ensures safe thermal margins below HDD manufacturer's 60°C operational limit while avoiding premature shutdown. |
Use Scenario: Measuring motherboard ambient near VRMs and chipset to trigger dynamic fan speed control and prevent component derating. IC Role / Device Role / Timing Role: Standalone digital temperature node interfaced to EC or BMC via 3.3 V SPI; operates in auto-conversion mode. Use Value: 0.25°C resolution enables precise PID tuning of fan curves, reducing acoustic noise without compromising cooling performance. |
| Office Equipment Power Supply Monitoring | Industrial Process Controller Cabinet Sensing |
Use Scenario: Monitoring internal temperature of laser printer power supplies to detect overheating caused by dust accumulation or aging capacitors. IC Role / Device Role / Timing Role: Low-power thermal watchdog placed near transformer and rectifier; wakes periodically from shutdown to log temperature trends. Use Value: 1 mA shutdown current enables continuous operation on standby rail, supporting predictive maintenance alerts without auxiliary power. |
Use Scenario: Detecting abnormal cabinet temperature rise in PLC enclosures due to failed forced-air cooling or ambient exceedance. IC Role / Device Role / Timing Role: Ruggedized ambient sensor mounted on DIN-rail bracket; interfaced to ARM Cortex-M4 controller via isolated SPI. Use Value: MSOP package withstands industrial vibration; ±1°C accuracy at 3.3 V ensures compliance with IEC 61000-6-2 EMC thermal derating thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31820 | 1-Wire interface (single-pin bidirectional), ±0.5°C accuracy, 12-bit resolution, no ID pin | Requires 1-Wire master support; better accuracy but higher cost and slower max update rate (100 ms) | Select for minimal wiring in distributed sensor networks where microcontroller has native 1-Wire peripheral. |
| LM75BIMM/NOPB | I²C interface, ±2°C accuracy, 9-bit resolution (0.5°C), no auto-conversion mode, no ID pin | Lacks auto-sampling; requires host-initiated reads; smaller MSOP-8 footprint but no shutdown current spec below 250 µA | Select for I²C-based systems needing lowest cost and proven qualification, accepting manual polling and coarser resolution. |
Compared with MAX31820 and LM75BIMM/NOPB, the AD7314ARM offers unique SPI-native auto-conversion with deterministic 400 ms interval and hardware ID pin for multi-drop robustness - making it optimal for deterministic, low-latency thermal supervision in resource-constrained controllers.
Availability
AD7314ARM is available at Aetrix Electronics and suitable for hard disk drives, PC motherboards, and office equipment requiring stable component supply across extended production lifecycles.
Supply support for AD7314ARM 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
Analog Devices is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7314ARM belongs to Analog Devices' precision temperature sensor product line, designed specifically for compact, low-power, digitally interfaced thermal monitoring in computing and industrial platforms.
FAQ
What is the operating temperature range of the AD7314ARM?
The AD7314ARM operates from –35°C to +85°C. This range is specified under all conditions in the datasheet and applies to both accuracy and functional operation. The device is not rated for extended industrial (–40°C to +125°C) or automotive temperature grades. Within its specified range, the AD7314ARM maintains ±2°C accuracy at lower supply voltages and ±1°C at 3 V–5.5 V, making it suitable for commercial computing and office environments.
Does the AD7314ARM require external components for basic operation?
Yes - the AD7314ARM requires a 0.1 µF ceramic decoupling capacitor between VDD and GND, placed as close as possible to the pins. No external oscillator, reference, or calibration components are needed, as the band gap sensor, 10-bit ADC, and internal conversion clock are fully integrated. The ID pin may optionally use a 100 kΩ pull-up resistor for device identification, but the internal 1 kΩ pull-down makes this optional.
How does the AD7314ARM enter and exit shutdown mode?
The AD7314ARM enters shutdown mode by writing a '1' to Bit 3 (power-down bit) of the control register via the SDI line during a 16-clock write cycle; the change takes effect on the 15th SCLK rising edge. It exits shutdown automatically upon any subsequent read or write operation, restarting the internal oscillator - the next temperature conversion completes ~25 ms later. The AD7314ARM remains readable in shutdown mode, returning the last valid conversion result.
Is the AD7314ARM pin-compatible with other Analog Devices temperature sensors?
No - the AD7314ARM uses a proprietary 8-lead MSOP pinout with Pin 1 as NC and Pin 7 as ID, which differs from ADT75, TMP75, or AD7414 footprints. Its CE/SCLK/SDI/SDO interface and ID pin assignment are unique to this family. Direct replacement would require PCB layout revision; functional alternatives like LM75BIMM/NOPB use I²C and different pin functions, confirming no pin-to-pin compatibility exists.
What is the meaning of "CKA" branding on the AD7314ARM?
"CKA" is the top-side laser marking code for the AD7314ARM, as confirmed in the official Analog Devices ordering guide. It appears on the package surface alongside date code and lot traceability information. This marking distinguishes the AD7314ARM from other variants (e.g., AD7314ARZ uses "CKB") and verifies authenticity and RoHS compliance (Z suffix = lead-free). The CKA marking is consistent across AD7314ARM, AD7314ARM-REEL, and AD7314ARMZ-REEL7 deliveries.
AD7314ARM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -35°C ~ 85°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.65V ~ 5.5V
- Resolution:
- 10 b
- Features:
- Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C
- Test Condition:
- -35°C ~ 85°C
- Operating Temperature:
- -35°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
AD7314ARM FAQ
1.How can I place an order for AD7314ARM through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7314ARM 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 AD7314ARM reliable?
The price and inventory of AD7314ARM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7314ARM is usually 5 days.
3.What payment methods are accepted for AD7314ARM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7314ARM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7314ARM?
AD7314ARM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7314ARM 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 AD7314ARM?
For technical support, including AD7314ARM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7314ARM requirements.
6.How does Aetrix verify that AD7314ARM is sourced from the original manufacturer or authorized distributors?
All AD7314ARM 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 AD7314ARM meets industry standards.
7.What is the process for return or replacement of AD7314ARM?
All AD7314ARM units undergo pre-shipment inspection (PSI). If there is an issue with AD7314ARM, 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 AD7314ARM part is unused and in its original packaging.
Return procedure for AD7314ARM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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