CY8C21345-24SXI - 24MHz PSoC 1 8-Bit MCU, 24 GPIO, 8KB Flash | Infineon
料号： CY8C21345-24SXI ✓ 量产中CY8C21345-24SXI 概述
A PSoC (Programmable System-on-Chip) is a mixed-signal microcontroller that integrates a CPU, configurable analog blocks, configurable digital blocks and dedicated routing into a single device, so analog front-end functions such as ADCs, comparators and amplifiers can be configured in silicon instead of being built from discrete components. In the taxonomy of semiconductors, the CY8C21345-24SXI is an 8-bit microcontroller, and within that class it belongs to the mixed-signal MCU / programmable system-on-chip family rather than to a general-purpose digital MCU.
Key device characteristics include a 3 V to 5.25 V operating supply range, an industrial temperature grade, four programmable digital blocks, and an M8C core that provides an 8x multiply with 32-bit accumulate. The 24 GPIOs provide flexible routing between the digital blocks, analog blocks, LCD segment outputs and general-purpose pins, which is what allows small peripheral counts to be handled without external glue logic. The 10-bit SAR ADC supports typical sensor-signal conditioning tasks such as thermistor, potentiometer and bridge-based measurement.
Architecturally, the Harvard-style M8C core separates instruction and data access, giving deterministic execution alongside the analog configuration capability of the PSoC fabric. Flash program memory is 8 KB (8K x 8), and the device is supplied in the 28-SOIC industrial package with a gull-wing lead form and rectangular body. This combination places the part squarely in the class of low-cost mixed-signal MCUs used for human-interface and control products.
Typical applications include LCD instrument panels and utility meters, capacitive or resistive touch keypads, small battery-powered sensor nodes, industrial temperature controllers, and compact consumer metering products where a display, a keypad and a small number of analog inputs must all be served by one inexpensive microcontroller.
When designing around this device, plan the analog and digital block configuration in PSoC Creator before layout, keep the LCD segment drive lines on dedicated pins, and confirm the flash budget early because 8 KB is the constraint most often hit when adding bootloader or logging features. Verify the SOIC-28 land pattern and pin assignment against the manufacturer datasheet before routing.
直接替换替代料： CY8C21345-24SXI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
CY8C21343-24SXI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
CY8C21252-24SXI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
CY8C27443-24SXI
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
CY8C22213-24PVI
✅ 直接替换📋 参考替代料（不在目录中）
CY8C21534-24PVXAT
✅ 直接替换📋 参考替代料（不在目录中）
CY8C20534-12PVXI
✅ 直接替换📋 参考替代料（不在目录中）
CY8C21345-24SXI 最大额定值与电气特性
| Product Family | PSoC 1 (21x45 / 22x45) |
| Core Architecture | M8C, Harvard architecture, 8-bit |
| Maximum CPU Frequency | 24 MHz |
| Multiplier / Accumulator | 8x multiply, 32-bit accumulate |
| Flash Memory | 8 KB (8K x 8) |
| 工作电源电压 | 3 V to 5.25 V |
| Maximum Operating Voltage | 5.25 V |
| Minimum Operating Voltage | 3 V |
| Number of GPIOs | 24 |
| Programmable Digital Blocks | 4 |
| Analog to Digital Converter | 10-bit SAR ADC |
| LCD Drive | Yes, dedicated LCD segment drive |
| 封装 | 28-SOIC (SOP-28) |
| Terminal Form | Gull wing |
| Package Shape | Rectangular |
| 安装方式 | Surface mount |
| Temperature Grade | Industrial |
CY8C21345-24SXI rectangular 引脚配置指南
CY8C21345-24SXI（rectangular 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： CY8C21345-24SXI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
CY8C21345-24SXI 适用于 6 应用s: LCD Instrument Panel and Utility Meter, Capacitive Touch Keypad Control, Battery-Powered Sensor Node, Industrial Temperature and Process Controller, Compact Energy Metering Product, Consumer Appliance Control Board.
LCD Instrument Panel and Utility Meter
The CY8C21345-24SXI suits metering and instrument-panel products because the dedicated LCD segment drive removes the need for an external display driver while the 24 GPIOs absorb keypad lines, alarm outputs and a communication port. The 10-bit SAR ADC digitizes the current-shunt or rectified-voltage signal feeding the display, and the 3 V to 5.25 V supply range allows direct operation from a rectified mains-derived rail behind a regulator. The design trade-off is the 8 KB flash limit: a multi-display product with logging or a bootloader should be checked against that budget, or a larger-flash PSoC 1 sibling should be selected instead.
推荐
Capacitive Touch Keypad Control
For capacitive touch keypads and capacitive-sensing front panels, the CY8C21345-24SXI provides 24 GPIOs, configurable analog blocks that can drive and sense the pad network, and a 24 MHz M8C core fast enough to scan several pads and debounce in software. Keeping sensing and the host interface on the same die reduces board area compared with a discrete touch controller plus MCU. The key limitation is that the 10-bit SAR ADC and analog block configuration differ across PSoC 1 derivatives, so a design migrating to a capacitive-sensing part such as the CY8C27443-24SXI must have its analog configuration redrawn in PSoC Creator.
推荐
Battery-Powered Sensor Node
The CY8C21345-24SXI works well in compact battery-powered sensing products where the sensing chain is short: a resistive or thermistor sensor is read by the 10-bit SAR ADC, the result is filtered on the M8C core, and the 24 GPIOs trigger a radio enable line or an indicator. The 3 V minimum operating voltage lets the node run from a single lithium cell or a regulated 3.3 V rail, and the PSoC 1 family is known for low-power sleep modes that reduce average current in duty-cycled logging designs. Because the device is a 24 MHz 8-bit part rather than a low-power radio SoC, the radio itself should be selected separately and switched with a GPIO to control standby current.
推荐
Industrial Temperature and Process Controller
In industrial temperature controllers and small process regulators, the CY8C21345-24SXI combines an accurate 10-bit ADC measurement path with configurable analog blocks for signal conditioning, plus enough digital I/O to drive relays, contactors and status indicators directly through driver transistors. The industrial temperature grade and 5.25 V maximum supply suit factory-floor equipment with a 24 V bus front end reduced by a regulator. The 24 MHz M8C core executes the control loop and PID update, while the LCD drive allows a local setpoint display. Watch the 8 KB flash ceiling if the firmware includes data logging, MODBUS maps or a bootloader.
推荐
Compact Energy Metering Product
Smart plug and compact energy-metering designs map well onto the CY8C21345-24SXI because the analog blocks and 10-bit SAR ADC can acquire rectified current and voltage signals, the LCD segment drive presents kWh readings without a companion driver, and the 24 GPIOs carry the pulse-output LED, tamper switch and communication lines. Running from a rectified mains-derived supply constrained to 5.25 V maximum keeps the design simple and safe around the isolated mains boundary. The main engineering caution is analog accuracy in a low-cost design: input scaling, reference stability and PCB creepage determine whether a 10-bit conversion is sufficient, and the 8 KB flash budget limits how much calibration and logging code can be added.
推荐
Consumer Appliance Control Board
Small household appliance controllers such as coffee makers, thermostats and water heaters benefit from the CY8C21345-24SXI because one device can run the mains-side switching logic, read temperature with the ADC, drive the display and supervise the keypad. The 24 MHz M8C core with 8x multiply and 32-bit accumulate supports ramp, timer and proportional-control computations without external logic, and the SOIC-28 package is easy to assemble on low-volume boards. The application must respect the 5.25 V supply maximum after the transformer or SMPS stage, and the digital I/O count becomes the constraint once motor drive, triac firing and multiple displays are added, in which case a same-family part with more GPIOs is the better starting point.
推荐
推荐产品汇总
工程参考数据： CY8C21345-24SXI ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CY8C21343-24SXI | CY8C21252-24SXI | CY8C27443-24SXI | CY8C22213-24PVI | CY8C21534-24PVXAT |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | 28-SOIC (SOP-28) | 28-SOIC (SOP-28) - same footprint | 28-SOIC (SOP-28) - same footprint | 28-SOIC (SOP-28) - same footprint | 28-SOIC (SOP-28) - same footprint | 28-SOIC (SOP-28) - same footprint |
| Maximum CPU Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Operating Supply Voltage | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V | 3 V to 5.25 V |
| LCD Drive | Yes | Yes | Reduced / not on identical pins | Yes | Yes | Yes |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial | Automotive (AT suffix) |
关键差异点
- Integrated LCD segment drive plus 10-bit SAR ADC in one 8-bit MCU （对比 CY8C22213-24PVI)
- 8 KB flash is the balanced sizing point versus flash-poor and flash-rich family members （对比 CY8C21252-24SXI)
- Industrial-grade 24 MHz variant versus automotive-only grade options （对比 CY8C21534-24PVXAT)
- Configurable PSoC analog and digital fabric replaces discrete front-end glue （对比 CY8C27443-24SXI)
设计说明
The most frequent design error with this device is treating it as a generic 8-bit MCU and laying out the board before the PSoC block configuration is fixed. The LCD segment pins, analog inputs and digital I/O share a configurable routing fabric, so a net that is a plain GPIO on one build can become an LCD segment or analog input on another. Freeze the pin assignment and the PSoC Creator configuration first, then derive the schematic and layout from the generated pin report.
The supply window is 3 V to 5.25 V. Decouple with a 0.1 uF ceramic capacitor close to each supply pin plus a bulk 1 uF to 10 uF near the IC, and keep analog and digital return currents separated to the ground plane. For LCD segment drive, the bias and segment voltage must stay inside the manufacturer limits, so confirm the LCD module's requirements against the datasheet before selecting the panel.
The 28-SOIC gull-wing outline is a standard SOP-28 land pattern, but pin 1 and the segment/analog pin density mean routing errors are easy. Follow the manufacturer footprint drawing rather than a generic library, keep the analog input traces short and away from LCD segment outputs, and provide adequate copper for the LCD drive current. Estimated: driving a typical 4-digit LCD with several segments active can move tens of milliamperes from the supply pins, so widen supply traces rather than relying on thin fanout wiring.
Flash is limited to 8 KB (8K x 8). Budget application code, the bootloader, calibration tables and any logging before committing to the part, because PSoC 1 project size is often underestimated once the startup code, library calls and display tables are added. If the design needs more, move to a larger-flash member of the same PSoC 1 family in the same SOIC-28 footprint rather than changing architecture.
合规信息
The part is an industrial-temperature PSoC 1 microcontroller in a 28-SOIC package. RoHS, REACH, lead-free and halogen-free statements are not published on the product listings and must be confirmed with the manufacturer for the specific ordering code and date code.
