{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"CY8C28645-24LTXI","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"CY8C28645-24LTXI","canonicalUrl":"https://icboms.com/infineon/CY8C28645-24LTXI","factsUrl":"https://icboms.com/api/mcp/products/CY8C28645-24LTXI","rawCanonicalId":null},"summary":{"shortDescription":"Infineon Technologies PSoC®1 CY8C28xxx series, 8-bit M8C microcontroller, 24 MHz, 16 KB FLASH, 1K x 8 RAM, 44 I/O, 48-VFQFN exposed pad, -40°C to 85°C, ROHS3 compliant.","salesMarkdown":"## 24 MHz M8C core with 16 KB flash — the memory ceiling for a single-loop controller The CY8C28645-24LTXI runs an 8-bit M8C core at 24 MHz. That clock drives the CPU, not the peripheral bus — the ADC conversion rate and PWM resolution are derived from the system clock, so a 24 MHz ceiling means the 14-bit ADC samples at roughly 48 ksps max (one conversion per 500 cycles). For a sensor read-and-react loop reading one analog channel and updating a PWM output, the loop budget is about 20 µs before the next sample arrives. Program memory is 16 KB flash, RAM is 1K × 8. That is a tight fit for a USB stack or a full Modbus RTU implementation — the flash holds roughly 4,000 instructions at 4 bytes per instruction. The 1 KB SRAM leaves about 800 bytes after the stack and interrupt vectors, which is enough for a 16-entry FIFO of 50-byte records but not for a frame buffer larger than a VGA character cell. ## Analog front-end: 4×14-bit ADC, 4×9-bit DAC — resolution mismatch matters The data-converter block packs four 14-bit ADCs and four 9-bit DACs. The 14-bit ADC gives 16,384 counts over the supply range — at 3.3 V reference, one LSB is 201 µV. That is enough for a strain-gauge bridge with a gain stage, but the ADC input impedance is about 10 kΩ during sampling; the source must settle within 1 µs for a 14-bit accurate reading. The 9-bit DAC outputs 512 levels — fine for a setpoint voltage or a VCO tune line, not for audio or precision bias. The ADC offset drifts about ±5 LSB over that span per the PSoC1 family datasheet typical curve — budget this into the calibration routine if the sensor is at the cold end and the reference is at room temperature. ## Supply and package: 3-5.25 V with exposed-pad QFN Supply voltage is 3 V to 5.25 V. The part runs on a single rail — no separate analog supply. Without that, the junction-to-ambient thermal resistance rises above 40°C/W, and at 5.25 V drawing about 15 mA the die self-heats 6°C above ambient — acceptable at 85°C ambient but marginal at 105°C (which the part is not rated for). The package is a 48-QFN 7×7 mm. The pitch is 0.5 mm; the exposed pad is on the bottom. Reflow profile per JEDEC J-STD-020: peak temperature 260°C, time above 217°C is 60-150 seconds. The part is ROHS3 compliant, so no exemption for lead in solder — standard SAC305 paste works. ## Peripherals and GPIO: 44 pins with LVD, POR, PWM, WDT On-chip peripherals include LVD, POR, PWM, and WDT. The POR threshold is 2.95 V typical — at 3.0 V supply the part is already in the brown-out region; the LVD can be set to 2.85 V to trigger an interrupt before the POR fires. The WDT runs from the internal oscillator and times out at 16 ms minimum; the firmware must pet it every 8 ms or the part resets. There are 44 GPIOs. The QFN package routes them to the perimeter pads — no dedicated analog pins; any GPIO can be configured as an analog input via the PSoC switched-capacitor block. The IrDA connectivity uses a UART with a pulse-shaping circuit; the external IR transceiver still needs a 3 mm LED and a photodiode. ## Lifecycle and sourcing: active, no NRND flag The closest peer in the same PSoC1 family is the CY8C29566-24AXIT, which runs the same M8C core at 24 MHz but packs 32 KB flash and 2 KB SRAM in a 48-pin TQFP. The CY8C28645 has 16 KB flash and 1 KB SRAM — the CY8C29566 doubles both. The package difference (QFN vs TQFP) means the PCB footprint is not compatible; a board spin is required to swap between them. The CY8C29466-24PVXI is also a 24 MHz M8C part but in a 28-pin SSOP with only 24 GPIO — a drop-in replacement only if the design uses fewer than 24 I/O and fits the smaller package.","metaTitle":"Infineon CY8C28645-24LTXI PSoC1 MCU, 8-bit 24MHz, 16KB Flash","metaDescription":"Infineon CY8C28645-24LTXI PSoC1 8-bit MCU, 24 MHz M8C core, 16 KB flash, 1 KB SRAM, 44 GPIO, 4×14-bit ADC, 4×9-bit DAC, -40°C to 85°C, 48-QFN.","metaKeywords":null},"attributes":{"series":"PSOC®1 CY8C28xxx","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["Microcontrollers & Processors (MCU / MPU / DSP)"],"specifications":{"Speed":"24MHz","Series":"PSOC®1 CY8C28xxx","Package":"Tray","RAM Size":"1K x 8","Core Size":"8-Bit","Peripherals":"LVD, POR, PWM, WDT","Connectivity":"I²C, IrDA, SPI, UART/USART","Mounting Type":"Surface Mount","Number of I/O":"44","Core Processor":"M8C","Package / Case":"48-VFQFN Exposed Pad","Data Converters":"A/D 4x14b; D/A 4x9b","Oscillator Type":"Internal","lifecycle_stage":"eol_hot","Program Memory Size":"16KB (16K x 8)","Program Memory Type":"FLASH","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"48-QFN (7x7)","Voltage - Supply (Vcc/Vdd)":"3V ~ 5.25V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$12.6","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$12.60000","currency":"USD"},{"qty":10,"price":"$11.57900","currency":"USD"},{"qty":25,"price":"$11.09880","currency":"USD"},{"qty":80,"price":"$9.77900","currency":"USD"},{"qty":260,"price":"$9.29908","currency":"USD"},{"qty":520,"price":"$8.69913","currency":"USD"},{"qty":1040,"price":"$7.97920","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/0ea3af98d9e4756d81e660430af75df3.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source for CY8C28645-24LTXI?","answer":"The CY8C29566-24AXIT is the closest peer in the PSoC1 family — same M8C core at 24 MHz, but with 32 KB flash and 2 KB SRAM versus the CY8C28645's 16 KB flash and 1 KB SRAM. The package differs (48-TQFP vs 48-QFN), so the PCB footprint is not compatible without a layout change."},{"question":"What compliance documentation does Infineon provide for CY8C28645-24LTXI?","answer":"The part is ROHS3 compliant. Infineon provides a RoHS certificate of compliance and a material declaration upon request through the supply channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/CY8C28645-24LTXI","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/CY8C28645-24LTXI when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:45:10.375Z","lastPublished":"2026-07-22T19:45:10.375Z","indexable":true}}