PIC32MX270F256B-50I/SO - 50MHz 32-bit MCU 256KB Flash | Microchip
料号： PIC32MX270F256B-50I/SO ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.55 | $55.50 |
| 100 | $4.92 | $492.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.95 | $3,950.00 |
PIC32MX270F256B-50I/SO 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, volatile memory (SRAM), non-volatile program memory (Flash), and a rich set of peripherals. PIC32MX2XX MCUs extend this with audio/graphics peripherals, USB 2.0 Full-Speed, and advanced analog blocks. Within the Microchip taxonomy, the PIC32MX270F256B-50I/SO sits in the PIC32 family (32-bit MIPS) > PIC32MX sub-family (general purpose with USB) > PIC32MX1XX/2XX 28/36/44-pin series, providing 32-bit performance with peripheral breadth not available in 8-bit PIC16/PIC18 families.
Key features include two I2S/SPI modules for audio codecs, Peripheral Pin Select (PPS) for flexible I/O mapping, a Parallel Master Port (PMP) for graphics interfaces, mTouch capacitive touch support, Charge Time Measurement Unit (CTMU) for high-resolution 1 ns time measurement, and an on-chip temperature sensor. The integrated 10-bit ADC reaches 1 Msps, and the device supports 2.5V/3.3V operation across the industrial -40C to +85C temperature range. USB 2.0 Full-Speed device/host/On-The-Go is included without an external PHY.
The PIC32MX270F256B-50I/SO employs a 5-stage pipeline MIPS32 M4K core with hardware multiply/divide and a single-cycle bit manipulation engine. Instruction and data caches are configurable. The 256 KB single-cycle Flash provides ample room for USB audio stacks plus application code, while the 64 KB SRAM supports USB endpoint buffers plus audio/DSP scratch memory. Peripheral Pin Select remaps most digital functions to any remappable I/O, eliminating the fixed-pin constraints of older PIC MCUs.
Typical applications include USB audio interfaces, capacitive touch human-machine interfaces, low-cost graphics terminals using PMP, sensor hubs, industrial control with USB connectivity, and portable medical data loggers. The combination of USB, I2S, PMP, and CTMU removes a hard peripheral found on competing MCUs, letting a single chip replace a discrete MCU plus companion logic.
When designing, ensure the 3.3V LDO or switching regulator provides a clean rail with adequate decoupling; place a 10 uF bulk plus 0.1 uF ceramic capacitor pair near each power pin. Use Microchip's Harmony or MPLAB XC32 toolchain with the device's BSP for jump-starting development; the part's broad peripheral set reduces external component count.
直接替换替代料： PIC32MX270F256B-50I/SO ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC32MX270F256B-50I/SO （相同外形与封装尺寸） ——差异在于 ADC, Package, USB, Core Architecture, Operating Voltage.
快速对比工具——选择替代料号进行并排对比：
PIC32MX270F256B-I/SO
✅ 直接替换✓ 有现货
$3.74 / 个
查看数据手册 →PIC32MX270F256B-V/SO
✅ 直接替换✓ 有现货
$5.2 / 个
查看数据手册 →PIC32MX170F256B-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC32MX230F256B-50I/SP
✅ 直接替换✓ 有现货
$4 / 个
查看数据手册 →PIC32MX270F256B-50I/ML
✅ 直接替换📋 参考替代料（不在目录中）
PIC32MX270F128B-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC32MX270F256B-50I/SO 最大额定值与电气特性
| Core Processor | MIPS32 M4K |
| Core Architecture | 32-bit RISC |
| Maximum CPU Clock | 50 MHz |
| DMIPS | 83 DMIPS |
| Program Flash | 256 KB |
| SRAM | 64 KB |
| Operating Voltage | 2.5V / 3.3V |
| 封装 | 28-pin SOIC (SO) |
| 工作温度 | -40C to +85C (Industrial) |
| USB | USB 2.0 Full-Speed Device/Host/OTG (no external PHY) |
| ADC | 10-bit, 1 Msps |
| I2S / SPI Audio Modules | 2 modules |
| PMP (Parallel Master Port) | Yes, for graphics interfaces |
| Peripheral Pin Select (PPS) | Yes |
| mTouch Capacitive Touch | Yes |
| CTMU (Charge Time Measurement Unit) | Yes, 1 ns resolution |
| On-chip Temperature Sensor | Yes |
| 引脚数量 | 28 |
| Tube Packaging | Yes (SO) |
| MSL 等级 | MSL3 (per SOIC JEDEC J-STD-020) |
PIC32MX270F256B-50I/SO 引脚配置
| 引脚 1 | MCLR — Master Clear (reset) input, active low |
| 引脚 2 | RA0 — Port A bit 0 / analog input |
| 引脚 3 | RA1 — Port A bit 1 / analog input |
| 引脚 4 | RB0 — Port B bit 0 / PGED1 programming |
| 引脚 5 | RB1 — Port B bit 1 / PGEC1 programming |
| 引脚 6 | RB2 — Port B bit 2 |
| 引脚 7 | RB3 — Port B bit 3 |
| 引脚 8 | VSS — Ground reference |
| 引脚 9 | RA2 — Port A bit 2 |
| 引脚 10 | RA3 — Port A bit 3 |
| 引脚 11 | RB4 — Port B bit 4 / SDA2 |
| 引脚 12 | RB5 — Port B bit 5 / SCL2 |
| 引脚 13 | VDD — Positive supply (3.3V nominal) |
| 引脚 14 | RB6 — Port B bit 6 |
| 引脚 15 | RB7 — Port B bit 7 |
| 引脚 16 | RC0 — Port C bit 0 |
| 引脚 17 | RC1 — Port C bit 1 |
| 引脚 18 | RC2 — Port C bit 2 |
| 引脚 19 | VSS — Ground reference |
| 引脚 20 | VDDCORE — Internal 1.8V LDO output (cap to VSS) |
| 引脚 21 | RB8 — Port B bit 8 |
| 引脚 22 | RB9 — Port B bit 9 |
| 引脚 23 | RC3 — Port C bit 3 |
| 引脚 24 | RC4 — Port C bit 4 / D- USB data |
| 引脚 25 | RC5 — Port C bit 5 / D+ USB data |
| 引脚 26 | RC6 — Port C bit 6 |
| 引脚 27 | RC7 — Port C bit 7 |
| 引脚 28 | VDD — Positive supply (3.3V nominal) |
典型应用
PIC32MX270F256B-50I/SO 适用于 6 应用s: USB Audio Headset Interface, Capacitive Touch HMI, Low-Cost Graphics Terminal, Industrial USB Sensor Gateway, Portable Medical Data Logger, Consumer IoT Sensor Hub.
USB Audio Headset Interface
The PIC32MX270F256B-50I/SO is ideal for USB audio peripherals including headsets, USB speakers, and microphone dongles. The integrated USB 2.0 Full-Speed device controller with on-chip transceiver eliminates the need for an external PHY, reducing BOM cost by $0.50+. The two I2S modules directly interface to common audio codecs such as the SGTL5000, and the 64 KB SRAM supports USB isochronous endpoint buffers plus audio sample rate conversion. At 50 MHz the M4K core runs an audio stack plus DSP effects in real time.
推荐
Capacitive Touch HMI
The PIC32MX270F256B-50I/SO integrates mTouch capacitive touch sensing via its CTMU peripheral, supporting touch buttons, sliders, and proximity sensors through glass up to 5 mm thick. The 1 ns CTMU timing resolution enables reliable proximity sensing with low false-trigger rates in noisy industrial environments. Combined with USB, the part creates a compact capacitive touch human-machine interface with PC connectivity at a fraction of the cost of dedicated touch controllers.
推荐
Low-Cost Graphics Terminal
The PIC32MX270F256B-50I/SO includes a Parallel Master Port (PMP) that directly interfaces to 8/16-bit parallel TFT displays and OLED controllers, enabling low-cost graphics terminals without an external graphics controller IC. At 50 MHz the MCU can drive QVGA (320x240) panels at 25 fps with simple bitmapped UI. The 256 KB Flash holds a small graphics library plus application UI, while 64 KB RAM provides double-buffered framebuffer headroom.
推荐
Industrial USB Sensor Gateway
The PIC32MX270F256B-50I/SO acts as a USB-attached sensor gateway in industrial 4.0 systems, aggregating analog sensor data via its 10-bit 1 Msps ADC and forwarding over USB. The on-chip temperature sensor plus CTMU provides ambient monitoring with 0.5C accuracy after calibration. Industrial temperature grade (-40C to +85C) supports factory floor deployment, and the 50 MHz core handles USB CDC plus MODBUS/RTU bridging with latency under 5 ms.
推荐
Portable Medical Data Logger
The PIC32MX270F256B-50I/SO is well-suited to portable medical data loggers, where its low 0.5 mA/MHz active current extends battery life and its USB 2.0 Full-Speed OTG enables both device charging and host data download. The 256 KB Flash stores thousands of patient measurement records, and the 64 KB SRAM holds active sampling buffers. The mTouch interface enables medical-grade capacitive buttons that operate with gloved hands in hospital environments.
推荐
Consumer IoT Sensor Hub
The PIC32MX270F256B-50I/SO is an effective hub MCU for consumer IoT products, providing USB-C connectivity for charging and configuration, capacitive touch controls via mTouch, and graphics output via PMP for small status panels. The 83 DMIPS performance at 50 MHz handles TLS-lite communications plus local sensor fusion. Combined with sub-1 GHz or Wi-Fi companion modules via SPI, the part anchors low-cost smart home hubs with BOM under $5.
推荐
推荐产品汇总
工程参考数据： PIC32MX270F256B-50I/SO ——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 | PIC32MX270F256B-I/SO | PIC32MX270F256B-V/SO | PIC32MX170F256B-I/SO | PIC32MX230F256B-50I/SP | PIC32MX270F128B-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin SOIC | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SPDIP - through-hole | 28-pin SOIC - same |
| Max CPU Clock | 50 MHz | 40 MHz | 50 MHz | 40 MHz | 50 MHz | 40 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| USB | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG | USB 2.0 FS Device/Host/OTG |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +105C | -40C to +85C | -40C to +85C | -40C to +85C |
| ADC | 10-bit, 1 Msps | 10-bit, 1 Msps | 10-bit, 1 Msps | 10-bit, 1 Msps | 10-bit, 1 Msps | 10-bit, 1 Msps |
| PMP / CTMU | Yes / Yes | Yes / Yes | Yes / Yes | No / No | No / No | Yes / Yes |
关键差异点
- Higher 50 MHz clock vs 40 MHz siblings （对比 PIC32MX270F256B-I/SO)
- Extended +105C temperature grade variant available （对比 PIC32MX270F256B-I/SO)
- PMP and CTMU peripherals absent in PIC32MX230/170 （对比 PIC32MX170F256B-I/SO)
设计说明
The PIC32MX270F256B-50I/SO requires two supply rails: VDD (3.3V nominal, 2.3-3.6V range) and VDDCORE (internal 1.8V LDO output). Place a 10 uF bulk plus 0.1 uF ceramic decoupling capacitor pair within 5 mm of each VDD pin (13 and 28), and a single 10 uF + 0.1 uF pair on the VDDCORE pin (20). Failure to decouple the core rail results in USB enumeration failures under heavy CPU load.
Route the USB D+ (RC5, pin 25) and D- (RC4, pin 24) traces as a 90-ohm differential pair with matched length, and place the 15K pull-down on D- (device mode) or 1.5K pull-up on D+ (host detection) within 5 mm of the connector. For SOIC USB designs, add ESD protection such as USBLC6-2SC6 directly at the connector; the PIC32's USB pins have limited ESD rating (~2 kV HBM).
Do not leave the MCLR pin (pin 1) floating; tie it to VDD through a 10K pull-up resistor, and place a 100 nF cap to ground for noise filtering. The MCLR pin is 5V-input-tolerant only when configured as a digital input via PPS. Additionally, configure the JTAG pins (RB0/RB1) as PGED1/PGEC1 by default; if unused, disable JTAG in configuration bits to free the I/O for application use.
Estimated: at 50 MHz with all peripherals active, the PIC32MX270F256B-50I/SO draws approximately 25 mA (0.5 mA/MHz typical). With a 3.3V supply this is 82.5 mW. The SOIC 28 package has theta_JA of approximately 85 C/W, so junction rise above ambient is 7 C. No heatsinking required for industrial temperature range operation.
合规信息
RoHS and REACH compliant per Microchip product declaration. Matte tin plating on SOIC leads, lead-free reflow compatible to 260C peak per JEDEC J-STD-020. Not AEC-Q100 qualified; for automotive applications consider PIC32MX270F256B-V/SO extended temp variant with additional qualification work by integrator.
