NAFE33352 - 24-bit Low-Power AIO Analog Front End | NXP
MPN： NAFE33352B40BS ✓ 啟用中NAFE33352B40BS 概覽
An analog front end (AFE) is the analog signal-conditioning stage that sits between real-world sensors and actuators and a digital controller. Within the industrial signal chain hierarchy, the AFE belongs to data conversion and signal conditioning ICs, bridging transducers, programmable logic controllers (PLCs), and process-control systems. AFEs integrate ADC, DAC, reference, and amplification functions to reduce board area and improve measurement accuracy compared with discrete solutions.
Key features of the NAFE33352 include one analog input/output channel and two universal input channels, a 24-bit ADC for high-precision measurement, an integrated low-drift voltage reference and low-offset drift buffers, and a readback path (Vsense, Isense) to measure voltage and current output. The NAFE33352 is the low-power version of the NAFEx3352 family, while the NAFE93352 is the high-speed version.
Technically, the device integrates a high-precision DAC, low-drift voltage reference, and a precise high-voltage amplifier to generate both small and wide output signals. An LVMUX connection to the ADC allows digitization of external and internal signals for condition monitoring. Combining current output with voltage input enables resistance and temperature measurement using RTD sensors or thermistors, eliminating external circuitry in many industrial I/O designs.
Typical applications include programmable logic controllers (PLC), process control, I/O modules, and data loggers, where universal analog input channels must accept voltage, current, and RTD signals within one footprint.
A key design consideration: as the low-power family member, verify conversion-rate requirements against the NAFE93352 high-speed variant before finalizing the design; both share the same system architecture and software configuration model.
This page synthesizes verified distributor and manufacturer data, drop-in alternatives, pricing tiers, and practical design notes not found in the NXP datasheet alone.
直接替換替代品，適用於 NAFE33352B40BS — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： NAFE33352B40BS （相同外形與佔位） — 差異在於 Product Type, Package, Configuration.
NAFE33351B40BS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
NAFE33350B40BS
✅ 直接替換📋 參考替代品（不在目錄中）
NAFE93352B40BS
✅ 直接替換聯絡詢價
查看資料表 →NAFE33352B40BS 最大額定值與電氣特性
| Product Type | Software-configurable universal AIO analog front end (AFE) |
| ADC Resolution | 24 bit |
| DAC Resolution (family) | 14/16/18 bit options |
| Analog Input/Output Channels | 1 AIO channel + 2 universal input channels |
| Voltage Reference | Integrated low-drift voltage reference |
| Buffers | Low-offset drift buffers |
| Output Amplifier | Precise high-voltage amplifier |
| Readback Path | Vsense and Isense voltage/current output measurement |
| Condition Monitoring | LVMUX connection to ADC for internal/external signal digitization |
| Sensor Support | RTD and thermistor measurement (via current output + voltage input) |
| Power Class | Low-power version (NAFE93352 is high-speed version) |
| 封裝 | 40-HVQFN, 6x6 mm |
| 安裝類型 | Surface Mount |
| Target Applications | PLC, process control, I/O modules, data loggers |
NAFE33352B40BS 40-hvqfn, 6x6 mm 腳位配置指南
NAFE33352B40BS（40-hvqfn, 6x6 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： NAFE33352B40BS.
請參閱 資料表 以查看完整腳位配置。
典型應用
NAFE33352B40BS 適用於 6 應用s: Programmable Logic Controllers (PLC), Process Control, Industrial I/O Modules, Data Loggers, RTD and Thermistor Temperature Measurement, Condition Monitoring Systems.
Programmable Logic Controllers (PLC)
The NAFE33352 fits PLC analog I/O cards because its software-configurable universal channels accept the 0-10 V, +/-10 V, and 0/4-20 mA signal standards common on industrial sensors and actuators without hardware changes. The 24-bit ADC provides the resolution headroom that PLC vendors need for 16-bit-class measurement accuracy after calibration, while the integrated low-drift voltage reference and low-offset drift buffers remove the external reference and amplifier stages that a discrete ADC design would require. On the output side, the precise high-voltage amplifier generates wide-swing setpoint signals directly, and the Vsense/Isense readback path enables loop diagnostics such as wire-break detection on 4-20 mA outputs. The low-power operating profile keeps thermal load manageable inside sealed PLC enclosures, where every channel IC contributes to the module's total dissipation budget.
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Process Control
Process control loops demand precise, stable measurement of pressure, flow, and temperature transmitters over long cable runs. The NAFE33352 addresses this with its 24-bit ADC, low-drift reference, and LVMUX-based condition monitoring, which lets the system periodically digitize internal and external diagnostic signals without a separate monitoring ADC. Because the device combines current output with voltage input, it can measure loop resistance directly - useful for verifying transmitter wiring health. The high-voltage output amplifier drives wide-range control signals to final control elements, and the readback path confirms the actual delivered output, closing the loop on actuation accuracy. As the low-power member of the NAFEx3352 family, it suits continuously powered control cabinets, while the high-speed NAFE93352 covers faster scan-rate loops within the same software framework.
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Industrial I/O Modules
Universal analog I/O modules must mix voltage, current, and RTD inputs on one board. The NAFE33352's one AIO channel plus two universal input channels are software-configurable, so a single PCB design covers multiple channel types, cutting inventory and qualification cost. RTD and thermistor measurement is achieved by sourcing current from the device output and reading the resulting voltage with the 24-bit ADC - no external excitation circuitry is needed. The integrated precision DAC family (14/16/18-bit options) and high-voltage amplifier also handle the module's analog outputs. Low-offset drift buffers preserve accuracy over industrial temperature ranges, and Vsense/Isense readback supports per-channel diagnostics required by modern module health monitoring. This integration typically replaces a multi-chip front end of mux, PGA, ADC, DAC, and reference.
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Data Loggers
Battery-backed and low-power data loggers benefit directly from the NAFE33352's position as the low-power version of the NAFEx3352 family. Its 24-bit ADC captures small sensor signals - thermocouple-, RTD-, and thermistor-derived voltages - with the resolution needed for sub-degree temperature logging, while the integrated reference removes warm-up and drift issues associated with external references that dominate logger error budgets. The universal input channels allow one logger hardware platform to accept many sensor types via software configuration, and the LVMUX enables periodic self-diagnostics such as supply and reference monitoring. Where faster sampling is required, designs can move to the pin-compatible high-speed NAFE93352 without re-architecting the logger board, preserving firmware investment across product speed tiers.
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RTD and Thermistor Temperature Measurement
The NAFE33352 measures temperature with RTDs and thermistors by exploiting its combined current output and voltage input architecture: the device sources an excitation current, and the 24-bit ADC digitizes the voltage across the sensing element to compute resistance and temperature. According to NXP documentation, this combination is explicitly supported, and the low-offset drift buffers plus low-drift reference limit the error terms that normally plague ratiometric temperature measurement. Because excitation, digitization, and reference are integrated, designers avoid discrete current-source and amplifier stages, and the Vsense/Isense readback enables open- and short-circuit sensor diagnostics expected in industrial temperature modules. The software-configurable channels let the same silicon support 2-, 3-, and 4-wire input schemes depending on the module's channel card design.
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Condition Monitoring Systems
Condition monitoring nodes sample slow-moving process variables and equipment health indicators. The NAFE33352's LVMUX connection to the ADC is purpose-built here: internal nodes and external auxiliary signals can be routed to the 24-bit ADC for periodic digitization, letting one IC monitor reference health, supply levels, and external sensors without adding a dedicated monitoring channel. The low-power profile suits always-on monitoring hardware, and the Vsense/Isense readback verifies that any commanded excitation or output actually reached the sensor, distinguishing real signals from wiring faults. For retrofit loggers and smart sensors, the software-configurable universal inputs accommodate heterogeneous sensor fleets. Where vibration or high-frequency condition data is required, the high-speed NAFE93352 variant provides the same package and software model with faster sampling.
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推薦產品摘要
工程參考資料，適用於 NAFE33352B40BS — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | NAFE33351B40BS | NAFE33350B40BS | NAFE93352B40BS |
|---|---|---|---|---|
| Package | 40-HVQFN (6x6 mm) | 40-HVQFN (6x6 mm) - same | 40-HVQFN (6x6 mm) - same | 40-HVQFN (6x6 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Function | Universal AIO-AFE (input + output) | Universal AIO-AFE | Analog output AFE only | Universal AIO-AFE (high speed) |
主要差異化特點
- True input + output integration in one IC (對比NAFE33350B40BS)
- Low-power operation at full precision (對比NAFE93352B40BS)
- Integrated RTD/thermistor measurement (對比NAFE33350B40BS)
設計說明
The NAFE33352 uses a 40-pin HVQFN (6x6 mm) package with an exposed pad. Solder the exposed pad to a grounded copper pour with an array of thermal vias - this pad is typically the main ground return for the analog front end and is critical for noise performance of the 24-bit ADC. Place the low-drift reference decoupling and ADC input RC filters close to the pins, and keep the high-voltage output amplifier routing away from high-impedance input traces to prevent crosstalk into precision measurements.
Do not assume channel behavior from other AFE families - the NAFE33352 channels are software-configurable and must be initialized for the intended mode (voltage in, current out, RTD, etc.) before measurement is valid. When measuring RTDs or thermistors, use the integrated current output with the voltage input path as documented, and account for excitation current accuracy in your temperature error budget. Also confirm whether your scan-rate requirement fits the low-power NAFE33352 or demands the high-speed NAFE93352 before locking the BOM.
Use the Vsense/Isense readback path for closed-loop output verification and wire-break detection on 4-20 mA loops: a readback current near zero with a nonzero command indicates an open loop. Schedule readback and LVMUX diagnostic measurements between normal conversion cycles so condition monitoring does not disturb measurement timing. Keep sensor excitation leads and RTD sense lines as Kelvin connections to preserve the 24-bit ADC's effective resolution at the sensing element.
合規資訊
Compliance data not present in the provided web data; consult the NXP NAFE33352B40BS product page for current RoHS/REACH status.
