CY8C3445AXE-181 - 50MHz 32KB PSoC 3 8-bit MCU | Infineon
MPN： CY8C3445AXE-181 ✓ 啟用中CY8C3445AXE-181 概覽
A microcontroller is a single integrated circuit containing a CPU core, memory, and peripherals dedicated to embedded control tasks. The CY8C3445 sits in the embedded microcontroller hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor) and, in PSoC 3, it adds a configurable array of analog and digital blocks. That array replaces the fixed-function peripherals found in older 8051 parts with programmable analog amplifiers, ADC and DAC blocks, comparators, timers, and serial interfaces that are routed by firmware rather than fixed by silicon.
Key features of the CY8C3445AXE-181 include the 50 MHz 8051 core with dedicated multiplier/accumulator hardware, 32 KB of flash for program storage, a wide 1.71 V to 5.5 V operating supply range, and the PSoC 3 configurable peripheral array with its characteristic low-leakage sleep modes and fast GPIO. Because the analog blocks are programmable, one device can serve as a mixed-signal controller for touch sensing, motor drive, and signal conditioning without external analog ICs.
Technically, the CY8C34xx family is built around a small-footprint 8051 core that reaches 50 MHz using a pipelined architecture with separate multiplier and divider blocks. The configurable block array is connected through a routing fabric, so peripheral placement and pin assignment are decided in the PSoC Creator design tool rather than fixed at manufacture. This is the core architectural difference versus a conventional 8051 such as the AT89C51, where timers, UARTs, and ADC channels are hard-wired to fixed pins.
Typical applications include automotive body control modules, sensor-hub and condition-monitoring nodes, industrial control panels, building automation endpoints, and low-power IoT sensing nodes where the programmable analog front end reduces the bill of materials. The 100-lead TQFP footprint exposes enough GPIO and analog-capable pins to bring out multiple mixed-signal channels simultaneously.
A key design consideration is that the PSoC Creator toolchain and the generated configuration data must accompany the firmware image; the on-chip configuration is programmed at boot, so field updates need to include the configuration flash content alongside the application code. Users should also confirm the exact pin multiplexing of their chosen configuration against the 100-pin TQFP pinout.
This page consolidates verified distributor pricing and availability for CY8C3445AXE-181 as of 2026-10-30, pin-compatible drop-in alternatives from the same PSoC 3 family, a parameter-by-parameter comparison, and practical design notes that go beyond the manufacturer datasheet.
直接替換替代品，適用於 CY8C3445AXE-181 — 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。
CY8C3445AXI-181
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CY8C3444AXE-181
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CY8C3446AXE-181
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CY8C3447AXE-181
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CY8C3445LXI-181
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CY8C3445AXE-181 最大額定值與電氣特性
| Device Type | 8-bit Microcontroller (MCU) |
| Product Family | PSoC 3 CY8C34xx automotive family |
| CPU Core | 8051-compatible 8-bit core with multiplier/accumulator |
| Maximum CPU Frequency | 50 MHz |
| Flash Memory | 32 KB (32K x 8) |
| Operating Supply Voltage Range | 1.71 V to 5.5 V |
| Programmable Peripheral Array | Configurable analog and digital blocks routed by firmware (PSoC Creator) |
| 封裝 | 100-lead TQFP (14 x 14 mm) |
| 腳位數 | 100 pins |
| 安裝類型 | Surface Mount |
| Automotive Family Membership | PSoC 3 CY8C34 automotive family |
| Unit Price (verified distributor anchor) | From $0.3086 (LCSC, as of 2026-10-30) |
CY8C3445AXE-181 100-lead tqfp (14 x 14 mm) 腳位配置指南
CY8C3445AXE-181（100-lead tqfp (14 x 14 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： CY8C3445AXE-181.
請參閱 資料表 以查看完整腳位配置。
典型應用
CY8C3445AXE-181 適用於 6 應用s: Automotive Body Control Module (BCM), Capacitive Touch Sensing and User Interface, Industrial Sensor Hub and Condition Monitoring Node, Building Automation and HVAC Endpoint, Low-Power IoT Sensing Node, Motor Control and Small Drive Module.
Automotive Body Control Module (BCM)
The CY8C3445AXE-181 fits a body control hub because its 50 MHz 8051 PSoC 3 core can service multiple CAN/LIN-class serial tasks while the programmable analog blocks handle input sensing directly. The 32 KB flash stores application code plus the PSoC Creator configuration image, and the 100-lead TQFP (14 x 14 mm) package exposes enough pins for door-zone inputs, LED drivers and wake-up comparators on one board. Operating from 1.71 V to 5.5 V allows the module to sit on a 5 V body rail or a 3.3 V regulated sub-rail without a second regulator stage. The trade-off is toolchain dependence: any peripheral re-mapping must be recompiled in PSoC Creator and the configuration block reloaded with the firmware, so firmware revision control must include the configuration data.
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Capacitive Touch Sensing and User Interface
The PSoC 3 configurable block array is the reason to select the CY8C3445AXE-181 for capacitive touch panels: the CapSense-style front end (integrated capacitor sensing and charge transfer amplifiers) can be placed in the analog array and routed to any usable pad, instead of being limited to a fixed pin list as on a classic 8051. The 50 MHz core leaves ample headroom for a debounce and gesture algorithm on top of the 32 KB flash budget, and the wide 1.71 V to 5.5 V supply range supports button and slider panels powered from a 1.8 V or 3.3 V rail. Because the same silicon also carries the system MCU function, a single device can scan keys, drive an LED bargraph and manage a serial display. Expect to budget flash and RAM carefully once the configuration and UI code are both included.
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Industrial Sensor Hub and Condition Monitoring Node
A condition-monitoring node built around the CY8C3445AXE-181 benefits from the programmable analog front end, which allows the amplifier gain, filter bandwidth and comparator thresholds to be set per sensor instead of being fixed by an external analog chain. The 50 MHz 8051 core can run the sampling and DSP routine alongside timers and serial links, while 32 KB of flash holds firmware for several sensing modes. Operating down to 1.71 V supports long-life battery and energy-harvesting deployments, and the 100-lead TQFP package gives enough I/O for multiple sensor inputs plus a status indicator. The main engineering caveat is that each change to the analog configuration alters the pin routing, so the firmware and configuration image must be versioned together and revalidated as a pair.
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Building Automation and HVAC Endpoint
The CY8C3445AXE-181 suits a room or HVAC controller where analog sensing and digital switching share one silicon device. Its programmable analog blocks can implement the sensor amplification and thresholding normally spread across an op-amp, comparator and ADC, and the 50 MHz 8051 core handles the thermistor linearisation, PID loop and control messaging. The 1.71 V to 5.5 V supply range means the same part covers 24 V systems with a post-regulated 5 V rail as well as 3.3 V-only boards, and the TQFP-100 footprint gives ample pins for relays, triac gates and bus transceivers. The trade-off against a dedicated 8-bit AVR is the learning curve for PSoC Creator configuration and the extra flash reserved for device settings.
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Low-Power IoT Sensing Node
For a battery-powered IoT node, the CY8C3445AXE-181 combines a low-leakage 8051 core with the PSoC 3 configurable blocks that can be switched off individually, so only the sensor front end and the radio interface stay active between transmissions. The 1.71 V lower operating voltage is important for coin-cell and Li-ion designs because it keeps the rail usable as the cell approaches its cutoff. At 50 MHz the device has enough performance to aggregate several sensors, pre-filter data and compress it before radio transmission, and the 32 KB flash can hold both the application and the PSoC Creator configuration image. The engineering caution is that average current, not peak current, determines battery life, so the duty cycle of the configured analog blocks must be reviewed together with the radio's current profile.
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Motor Control and Small Drive Module
The CY8C3445AXE-181 can act as the control core of a small brushless or stepper driver because the PSoC 3 configurable array provides programmable comparator, timer and PWM blocks close to the 8051 core, tightening the loop between current sensing and commutation compared with a discrete 8051 design. The 50 MHz clock allows fast current-loop updates alongside the sequencer, and the 100-lead TQFP package exposes enough pins for gate-drive signals, phase current sensing and a communication link to a host. Because the analog blocks are firmware-configurable, the current-sense gain and PWM dead time can be tuned in software without a respin, provided the configuration and PWM library are kept under version control. Verify the operating temperature grade for motor environments, as ambient heat inside a drive enclosure can exceed consumer limits.
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推薦產品摘要
工程參考資料，適用於 CY8C3445AXE-181 — 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 | CY8C3445AXI-181 | CY8C3444AXE-181 | CY8C3446AXE-181 | CY8C3447AXE-181 | CY8C3445LXI-181 |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | 100-TQFP (14x14) | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same | 100-TQFP (14x14) - same |
| CPU Core | 8051-compatible 8-bit | 8051-compatible 8-bit | 8051-compatible 8-bit | 8051-compatible 8-bit | 8051-compatible 8-bit | 8051-compatible 8-bit |
| Maximum Frequency | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz | 50 MHz |
| Flash Memory | 32 KB (32K x 8) | 32 KB (32K x 8) | 32 KB (32K x 8) class | 32 KB (32K x 8) class | 32 KB (32K x 8) class | 32 KB (32K x 8) |
| Operating Supply Voltage | 1.71 V to 5.5 V | 1.71 V to 5.5 V | 1.71 V to 5.5 V | 1.71 V to 5.5 V | 1.71 V to 5.5 V | 1.71 V to 5.5 V |
| Product Family / Qualification Grade | PSoC 3 CY8C34 automotive family (E) | PSoC 3 CY8C34 industrial grade (I) | PSoC 3 CY8C34 automotive family (E) | PSoC 3 CY8C34 automotive family (E) | PSoC 3 CY8C34 automotive family (E) | PSoC 3 CY8C34, L-series ordering code |
| Configurable Peripheral Capacity | Reference CY8C34xx PSoC 3 block array | Same block array as CY8C3445 | Approximately 10 % less than CY8C3445 | Approximately 10 % more than CY8C3445 | Approximately 20 % more than CY8C3445 | Same block array as CY8C3445 |
主要差異化特點
- Programmable analog and digital block array replaces fixed 8051 peripherals (對比AT89C51 / ATMEGA328P-MNR class 8-bit MCUs)
- Higher clock rate within the 8-bit 8051 class (對比ATMEGA328P-MNR (16 MHz typical 8-bit core))
- Pin-compatible second source across the CY8C34 automotive family (對比CY8C3446AXE-181 / CY8C3447AXE-181)
設計說明
The most frequent PSoC 3 design error is forgetting that the peripheral configuration is data, not code. The PSoC Creator toolchain writes a device configuration image into a reserved flash region that is loaded at reset; if firmware is reprogrammed without re-flashing that image, the analog and digital blocks come up with the wrong routing and the board appears dead or misbehaves. Always flash the configuration together with the application and keep both under version control, and re-run the configuration check after any pin or clock change.
Route the 100-lead TQFP-100 (14 x 14 mm) with the standard 0.5 mm pitch land pattern and 0.25 mm trace/space rules, and place the decoupling network directly at the supply pins: one 100 nF ceramic per supply pin group plus a bulk 4.7 uF X5R/X7R capacitor close to the device. Keep the analog supply and the digital supply on separate filtered rails if the design uses the analog array, and provide a solid ground pour under the device to keep thermal and noise performance predictable at 50 MHz.
Estimated: with a 3.3 V rail and a 50 MHz active-mode core, the device can draw several tens of milliamps during compute bursts. In a duty-cycled IoT node, average current, not peak current, sets battery life, so profile the enabled analog blocks rather than only the CPU. Choose the lowest supply voltage that still meets timing (down to 1.71 V) and disable unused configurable blocks in firmware, since each active block adds both dynamic and leakage current.
合規資訊
The device is documented in the Infineon PSoC 3 CY8C34 automotive family datasheet (per distributor document listings as of 2026-10-30), indicating automotive family membership, but no explicit RoHS, REACH, AEC-Q100 grade or lead-free statement was present in the retrieved data, so those fields are marked unknown rather than assumed.
