AD7314ARMZ - 10-Bit Digital Temp Sensor SPI | Analog Devices
部品番号: AD7314ARMZ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.82 | $28.20 |
| 100 | $2.45 | $245.00 |
| 500 | $2.15 | $1,075.00 |
| 1,000 | $1.88 | $1,880.00 |
AD7314ARMZ 概要
A digital temperature sensor is an integrated circuit that converts ambient temperature into a digital output using an internal sensing element and an analog-to-digital converter. These devices sit within the broader temperature sensor family alongside analog-output and thermistor solutions, and they form the sensing layer of thermal management, system protection, and performance-optimization subsystems in industrial, networking, and consumer electronics.
Key features include a wide 2.65V to 5.5V supply range, an SPI/QSPI/MICRO-WIRE compatible serial interface for direct microcontroller connection, a shutdown mode for battery-powered designs, and an ID pin with internal 1k ohm pull-down that lets a host distinguish multiple devices on a shared bus. The 10-bit output yields 0.25 degree C steps, sufficient for fan control and over-temperature throttling loops.
Architecturally, the bandgap sensor produces a voltage proportional to die temperature, which the on-chip SAR ADC converts on demand under host control. Read and write operations over the flexible serial interface allow configuration and data retrieval, while shutdown cuts quiescent current between conversions, conserving energy in portable and embedded systems.
Typical applications include thermal management in servers and networking equipment, temperature monitoring in industrial controllers, and environmental sensing in consumer and portable electronics. Low voltage operation and the compact MSOP footprint suit space-constrained PCBs.
Design tip: decouple VDD with a 0.1uF ceramic capacitor close to the pin and keep thermal paths short for accurate die-to-ambient tracking. Use the ID pin carefully to avoid bus contention in multi-device systems.
ドロップイン代替品: AD7314ARMZ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD7314ARMZ （同一形状・フットプリント） — 相違点: ADC Type, Accuracy, Interface, Operating Temperature Range, Package.
クイック比較ツール — 並列比較する代替部品を選択:
AD7814ARMZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AD7416ARMZ
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
TMP121AIDBVR
⚡ 同一パッケージ ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AD7314ARMZ-REEL7
✅ ドロップイン✓ 在庫あり
$1.15 / 個
データシートを見る →AD7314ARMZ 最大定格＆電気的特性
| センサタイプ | Digital, Local Temperature Sensor |
| 分解能 | 10 bit (0.25 degree C) |
| Accuracy | +/-2 degree C |
| 動作温度範囲 | -35 degree C to +85 degree C |
| Supply Voltage Range | 2.65 V to 5.5 V |
| インターフェース | SPI, QSPI, MICRO-WIRE compatible serial |
| 出力タイプ | Serial (digital) |
| Sensing Element | Bandgap temperature sensor |
| ADC Type | 10-bit SAR ADC |
| Shutdown Mode | Yes |
| ID Pin | Yes, internal 1k ohm pull-down |
| パッケージ | 8-lead MSOP (uSOIC) |
| 実装タイプ | Surface Mount |
| Marking Code | CKA |
| RoHS ステータス | Compliant (Z suffix = lead-free) |
| Typical Applications | Thermal management, industrial control, consumer electronics |
AD7314ARMZ ピン構成
| ピン 1 | GND — Ground reference |
| ピン 2 | DIN — Serial data input (write/configure) |
| ピン 3 | SCLK — Serial clock input (SPI/QSPI/MICRO-WIRE) |
| ピン 4 | CS — Chip select, active low |
| ピン 5 | ID — Identification pin with internal 1k ohm pull-down |
| ピン 6 | VDD — Power supply, 2.65V to 5.5V |
| ピン 7 | DOUT — Serial data output (temperature readback) |
| ピン 8 | GND — Ground reference |
主な用途
AD7314ARMZ の用途: 6 件s: Server and Networking Thermal Management, Industrial Controller Monitoring, Portable and Battery-Powered Devices, Consumer Electronics Environmental Sensing, Multi-Sensor Bus Systems, Test and Measurement Instrumentation.
Server and Networking Thermal Management
The AD7314ARMZ suits board-level thermal monitoring in servers, switches, and routers where its 0.25 degree C resolution enables fine-grained fan-speed control and throttling decisions. Its SPI/QSPI/MICRO-WIRE interface connects directly to BMC or FPGA supervision logic, and the ID pin with 1k ohm pull-down allows a single bus scheme to distinguish multiple sensor sites. Placed near hotspots such as MAC or PHY devices, it reports die-proximate temperature; the shutdown mode trims standby power between periodic polls.
おすすめ
Industrial Controller Monitoring
In PLCs and industrial controllers, the AD7314ARMZ monitors cabinet and board temperature with +/-2 degree C accuracy over -35 degree C to +85 degree C, adequate for alarm and derating thresholds. The 2.65V to 5.5V supply range accommodates legacy 5V logic and modern 3.3V MCUs without level shifting on the SPI bus. Conversions are host-initiated, giving deterministic sampling for control loops; the 10-bit output provides 0.25 degree C steps that avoid control chatter near setpoints in closed-loop thermal regulation.
おすすめ
Portable and Battery-Powered Devices
The shutdown mode and low-voltage 2.65V minimum supply make the AD7314ARMZ efficient in battery-operated equipment. Between measurements the device is powered down, cutting average current draw, then woken by the host over SPI for on-demand conversion. The compact 8-lead MSOP (uSOIC) occupies minimal PCB area in handheld and wearable layouts. Its digital serial output avoids the ADC channel and calibration overhead an analog thermistor solution would require, simplifying firmware and preserving microcontroller ADC resources.
おすすめ
Consumer Electronics Environmental Sensing
In set-top boxes, appliances, and smart-home devices, the AD7314ARMZ provides low-cost digital temperature telemetry for over-temperature protection and comfort algorithms. The SPI-compatible interface integrates with low-cost MCUs, and the 0.25 degree C resolution suffices for user-facing readouts and hysteresis-based fan or heater control. The Z-suffix RoHS-compliant MSOP-8 package supports standard lead-free reflow, and the device's simple command protocol keeps firmware footprint small in cost-sensitive consumer platforms.
おすすめ
Multi-Sensor Bus Systems
The ID pin with internal 1k ohm pull-down distinguishes AD7314ARMZ devices sharing a serial bus, enabling board designs with several sensor sites addressed by one host SPI peripheral plus per-device chip-select or ID discrimination. This simplifies replacement and expansion in multi-zone thermal architectures. Conversions are individually triggered with 10-bit, 0.25 degree C output per site, giving uniform data formatting across zones and allowing identical firmware drivers for every monitored point on the assembly.
おすすめ
Test and Measurement Instrumentation
Bench instruments and data loggers use the AD7314ARMZ for internal chassis temperature logging, enclosure ambient tracking, and cold-junction-adjacent monitoring. The deterministic host-triggered conversion and serial digital output integrate cleanly with FPGA or MCU front ends, while 0.25 degree C resolution captures thermal drift trends during long acquisitions. Shutdown mode keeps self-heating influence minimal during idle periods, improving measurement repeatability in precision logging applications.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD7314ARMZ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7814ARMZ | AD7416ARMZ | TMP121AIDBVR |
|---|---|---|---|---|
| Package | 8-lead MSOP (uSOIC) | 8-lead MSOP (uSOIC) - same | 8-lead MSOP (uSOIC) - same | MSOP-class 8-lead - verify footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 10 bit (0.25 degree C) | 10 bit | 10 bit (0.25 degree C) | 12 bit (0.0625 degree C) |
| Interface | SPI/QSPI/MICRO-WIRE | SPI-compatible serial | 2-wire (I2C/SMBus) | SPI-compatible |
| ID Pin / Multi-Device | Yes (internal 1k ohm pull-down) | No | I2C address select | No |
| Shutdown Mode | Yes | Yes | Yes | Yes (shutdown command) |
主な差別化要因
- ID pin for multi-device bus discrimination （vs TMP121AIDBVR)
- Ultra-low 2.65V minimum supply （vs AD7416ARMZ)
- Complete sensing subsystem on chip （vs Discrete thermistor + ADC)
設計ノート
Decouple VDD with a 0.1uF ceramic capacitor placed within 5mm of pin 6, with a solid ground return to pin 1/pin 8. Because the AD7314ARMZ measures its own die temperature, place it thermally close to the component being monitored and away from power resistors or hot regulators to avoid skewed readings. The compact MSOP-8 exposes minimal copper; keep traces short on SCLK and CS to limit ringing in high-speed SPI buses.
Supply the AD7314ARMZ from a quiet 2.65V to 5.5V rail. Avoid shared rails with high dV/dt loads; switching-regulator ripple can couple through VDD and degrade conversion repeatability. If the sensor shares an SPI bus with 5V peripherals while the host runs at 3.3V, verify logic-level compatibility or add level translation such as the TXS0108E on DIN/SCLK/CS.
The ID pin has an internal 1k ohm pull-down - do not drive it against a strong external pull-up, as this causes bus contention and excess current. Observe CS framing on every transaction; leaving CS asserted between transfers can leave the serial port mid-frame. Also account for self-heating: frequent conversions raise die temperature slightly above ambient, so poll at reasonable intervals for accurate ambient readings.
コンプライアンス情報
Z suffix denotes lead-free/RoHS-compliant ADI version per distributor listings. Other compliance statuses not stated in provided data.
