PIC32MX120F032B-50I/SS - 50MHz 32-bit MCU 32KB Flash | Microchip
MPN: PIC32MX120F032B-50I/SS ✓ Hoạt độngPIC32MX120F032B-50I/SS Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and configurable peripherals onto one die. The PIC32MX1XX/2XX family sits in the hierarchy: microcontroller -> 32-bit MCU -> MIPS M4K architecture -> Microchip PIC32MX series -> entry-level flash-MCU segment. Designed for connected and low-power embedded designs, the PIC32MX120 line is the lowest pin-count / lowest Flash member of the family, targeting cost-sensitive applications that still need 32-bit performance, USB-OTG, or graphics peripherals.
Key features that distinguish this part include Peripheral Pin Select (PPS), which remaps most digital I/O to virtually any I/O pin for flexible PCB routing; a 16-bit Parallel Master Port (PMP) for external memory or graphics; a Charge Time Measurement Unit (CTMU) for mTouch capacitive-touch buttons and sliders; and a 10-bit 1 Msps Analog-to-Digital Converter with up to 13 analog input channels. The PIC32MX120 also integrates a real-time clock-calendar, a watchdog timer, and multiple power-management modes that drop quiescent current into the microamp range for battery-powered designs.
Architecturally, the PIC32MX120 uses a Harvard-style MIPS32 M4K core with a 5-stage pipeline, single-cycle multiply, hardware divide, and tightly-coupled prefetch module to keep Flash accesses from bottlenecking execution. The 50 MHz (-50) speed grade is the higher-performance bin of the family and supports 50 MHz operation across the full industrial temperature range, while the 40 MHz (-40) grade supports 40 MHz only. Industrial-grade silicon (-I) is rated to 105 C ambient.
Typical applications for the PIC32MX120F032B-50I/SS include low-cost consumer devices, mTouch capacitive touch user interfaces, audio playback systems using the I2S codec interface, low-end graphics terminals driven by PMP, USB device peripherals in the 28-pin form factor, and industrial sensor / control nodes. The 32 KB Flash comfortably holds small graphical menus, USB stacks (e.g. Microchip MLA / Harmony Lite), and RTOS workloads.
When designing with this part, plan for an external supervisor or internal POR delay for clean reset behavior, place the 8 MHz-40 MHz crystal within 10 mm of the OSC pins, and follow Microchip's recommendations for decoupling (0.1 uF + 4.7 uF within 5 mm of each VDD/VSS pair). The CTMU requires an external current-setting resistor; PPS mappings must be locked after configuration to avoid glitches during runtime. For migration to higher pin-count members, the PIC32MX130/150/170/270 families share this die with additional Flash and peripherals and are upward-compatible in software.
This page synthesizes distributor pricing, drop-in alternatives in the same 28-SSOP footprint, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC32MX120F032B-50I/SS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC32MX120F032B-50I/SS (cùng hình factor và footprint) — khác nhau ở Package, Program Memory (Flash), Core Architecture, ADC, Operating Temperature Range.
PIC32MX130F032B-50I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC32MX110F016B-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC32MX170F032B-50I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC32MX130F064B-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC32MX150F032B-50I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC32MM0064GPM028-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC32MM0256GPM028T-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC32MX120F032B-50I/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | MIPS32 M4K 32-bit RISC |
| Core Count | Single-core |
| Maximum CPU Frequency | 50 MHz |
| Program Memory (Flash) | 32 KB (32K x 8) |
| Data RAM | 8 KB |
| Operating Voltage Range | 2.3 V to 3.6 V |
| Khoảng nhiệt độ hoạt động | -40 C to +105 C (Industrial) |
| Active Current | < 0.5 mA/MHz |
| I/O Pins | 21 (multiplexed) |
| Hộp | 28-pin SSOP |
| Kiểu lắp đặt | Surface Mount |
| ADC | 10-bit, 1 Msps, up to 13 channels |
| DMA Channels | 4 |
| UART | 2 (with LIN and IrDA support) |
| SPI | 2 (shared with I2S) |
| I2C | 2 |
| Parallel Master Port (PMP) | Yes, 16-bit |
| Peripheral Pin Select (PPS) | Yes |
| CTMU (mTouch) | Yes |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC32MX120F032B-50I/SS
| Chân 1 | PGED3/AN0/RPB0/RB0 — Programming data, analog input 0, or GPIO |
| Chân 2 | PGEC3/AN1/RPB1/RB1 — Programming clock, analog input 1, or GPIO |
| Chân 3 | VSS — Ground reference |
| Chân 4 | AN2/C1INC/RPB2/RB2 — Analog input 2, comparator 1 input, or GPIO |
| Chân 5 | AN3/C1IND/RPB3/RB3 — Analog input 3, comparator 1 input, or GPIO |
| Chân 6 | PGEC1/VREF-/CVREF-/AN4/RB4 — Programming clock, VREF-, or analog input 4 |
| Chân 7 | PGED1/VREF+/CVREF+/AN5/RB5 — Programming data, VREF+, or analog input 5 |
| Chân 8 | AN6/RPB6/RB6 — Analog input 6 or GPIO |
| Chân 9 | AN7/RPB7/RB7 — Analog input 7 or GPIO |
| Chân 10 | VSS — Ground reference |
| Chân 11 | VDD — Positive supply (2.3 V to 3.6 V) |
| Chân 12 | OSCI/CLKI/RA3 — External oscillator input or GPIO |
| Chân 13 | OSCO/CLKO/RA2 — External oscillator output or GPIO |
| Chân 14 | TDO/RA1 — Trace data output or GPIO |
| Chân 15 | TCK/RA0 — Trace clock or GPIO |
| Chân 16 | TMS/RPB8/RB8 — Test mode select or GPIO |
| Chân 17 | VBUS/AN8/RPB9/RB9 — USB VBUS detect (PIC32MX220/250 only) or analog input 8 |
| Chân 18 | D-/AN10/RPB11/RB11 — USB D- (on USB variants) or analog input 10 |
| Chân 19 | D+/AN11/RPB10/RB10 — USB D+ (on USB variants) or analog input 11 |
| Chân 20 | VDD — Positive supply (2.3 V to 3.6 V) |
| Chân 21 | VSS — Ground reference |
| Chân 22 | AN12/RPC0/RC0 — Analog input 12 or GPIO |
| Chân 23 | AN13/RPC1/RC1 — Analog input 13 or GPIO |
| Chân 24 | RPC2/SDA1/RC2 — I2C1 SDA or GPIO (PPS-remappable) |
| Chân 25 | RPC3/SCL1/RC3 — I2C1 SCL or GPIO (PPS-remappable) |
| Chân 26 | RPC4/PMA0/RC4 — PMP address 0 or GPIO |
| Chân 27 | RPC5/PMA1/RC5 — PMP address 1 or GPIO |
| Chân 28 | RPC6/PMA2/RC6 — PMP address 2 or GPIO |
Ứng dụng tiêu biểu
PIC32MX120F032B-50I/SS phù hợp cho 6 Áp dụngs: mTouch Capacitive Touch User Interface, Low-Cost Audio Player with I2S Codec, Industrial Sensor Node / Modbus RTU, USB HID / CDC Device Firmware (Migration Variant), Small TFT / Graphics Terminal, Battery-Powered Low-Power Embedded Device.
mTouch Capacitive Touch User Interface
The PIC32MX120F032B-50I/SS fits mTouch capacitive touch interfaces thanks to its on-chip Charge Time Measurement Unit (CTMU), 10-bit ADC, and 50 MHz MIPS core that runs Microchip's touch firmware libraries with low latency. With up to 13 ADC channels, the MCU can scan 12+ touch electrodes at 10 ms update rates while leaving CPU headroom for housekeeping. The CTMU provides a hardware-based charge-time measurement that is robust against humidity and temperature drift, and the 32 KB Flash accommodates Microchip's mTouch reference firmware plus application code. Designers place 1 nF to 10 nF touch pads on PCB, route them to ADC-capable pins, and add a single current-setting resistor for the CTMU. The 28-SSOP footprint also keeps BOM cost low versus larger QFP parts typically used in capacitive touch designs.
Được đề xuất
Low-Cost Audio Player with I2S Codec
The PIC32MX120F032B-50I/SS drives low-cost audio playback through its two I2S/SSP peripherals, which interface directly to codecs such as the Microchip WM8904 family or TI TLV320AIC3x. At 50 MHz, the core can handle 16-bit/44.1 kHz stereo audio decoding from compressed formats (WAV, ADPCM, Ogg Vorbis via the Helix library) with sustained CPU cycles to spare for UI and storage. The 8 KB SRAM is sufficient for small audio buffers, and the 32 KB Flash holds the decoder plus a basic menu UI. The I2S module, together with DMA-driven playback, offloads the CPU and supports sample-accurate timing. The PMP can also drive a small TFT display for cover art. Industrial temperature rating makes it suitable for in-vehicle infotainment prototypes and public-address devices.
Được đề xuất
Industrial Sensor Node / Modbus RTU
The PIC32MX120F032B-50I/SS is well-suited for low-cost industrial sensor nodes using Modbus RTU, thanks to its two UART peripherals (with LIN/IrDA support) and the wide 2.3 V to 3.6 V supply range that operates directly from a 24 V->3.3 V industrial bus. The 50 MHz MIPS core executes Modbus RTU handling, sensor sampling, and digital filtering with substantial headroom. The 10-bit ADC and CTMU handle 4-20 mA loop interfaces, RTD bridges, or capacitive proximity sensors. The -I industrial temperature grade (-40 C to +105 C) supports unheated enclosures, and PPS allows flexible PCB routing for compact sensor modules. Designers pair it with an isolated RS-485 transceiver, a 3.3 V LDO, and a small OLED driven by PMP or SPI to build a full sensor gateway in the 28-SSOP footprint.
Được đề xuất
USB HID / CDC Device Firmware (Migration Variant)
Although the PIC32MX120F032B-50I/SS does not include a USB module, it is frequently designed in alongside the pin-compatible PIC32MX220F032B-50I/SS (same 28-SSOP footprint, with USB-OTG added). The PIC32MX120 variant handles non-USB housekeeping; the 220 variant in the same socket adds USB on demand. This strategy gives product lines a single PCB that supports USB and non-USB SKUs. For pure USB devices, designers typically start with PIC32MX250F128B-50I/SS instead, which integrates USB-OTG with 128 KB Flash. Microchip's MLA USB stack provides HID, CDC, and MSD class drivers, all running comfortably at 50 MHz on this MIPS M4K core.
Được đề xuất
Small TFT / Graphics Terminal
The PIC32MX120F032B-50I/SS drives small TFT displays via its 16-bit Parallel Master Port (PMP), which can directly interface 8-bit and 16-bit parallel LCDs at speeds sufficient for QVGA (320x240) panels. The 50 MHz MIPS core can refresh graphics buffers while handling a small RTOS, USB-OTG, or touch UI. The CTMU is unused in graphics but available if the display has a capacitive overlay. The 28-SSOP footprint pairs well with PMP-driven QVGA panels, and the 8 KB SRAM is enough for small framebuffer-only designs (use partial refresh). For larger screens, the PIC32MX170/270 series upgrade the Flash/RAM while keeping the same 28-pin footprint on the higher-pin-count packages.
Được đề xuất
Battery-Powered Low-Power Embedded Device
The PIC32MX120F032B-50I/SS suits battery-powered designs thanks to its active current under 0.5 mA/MHz at 50 MHz (around 25 mA at full load) and dedicated low-power sleep modes that drop the core into microamp-range quiescent current. Combined with the wide 2.3 V to 3.6 V supply, it can run directly from a single Li-ion (3.0 V to 4.2 V) or two alkaline cells (2.6 V to 3.2 V). The CTMU wakes the MCU on capacitive touch; the RTCC maintains timekeeping during sleep. Designers use the PIC32's low-power modes (Sleep, Deep Sleep with RTCC) to keep idle current in single-digit microamps for battery life in the multi-month range. The 28-SSOP keeps the board compact, and PPS remaps wake sources to any pin to optimize sleep-current routing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC32MX120F032B-50I/SS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC32MX130F032B-50I/SS | PIC32MX110F016B-I/SS | PIC32MX170F032B-50I/SS | PIC32MM0064GPM028-I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) | 28-SSOP (same) |
| Core Architecture | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | MIPS32 M4K 32-bit | PIC32MM (MIPS M4K-compatible) 32-bit |
| Maximum CPU Frequency | 50 MHz | 50 MHz | 40 MHz (-20%) | 50 MHz | 25 MHz (-50%) |
| Flash Memory | 32 KB | 64 KB (+100%) | 16 KB (-50%) | 256 KB (+700%) | 64 KB (+100%) |
| RAM | 8 KB | 8 KB | 4 KB (-50%) | 64 KB (+700%) | 8 KB |
| Operating Voltage Range | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.3 V to 3.6 V | 2.0 V to 3.6 V |
| Operating Temperature Range | -40 C to +105 C (Industrial) | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +125 C (extended) |
| USB Module | Not present on this part | Not present | Not present | Not present | Not present |
Bảo phân biệt quan trọng
- Upward Flash scaling without PCB change (vsPIC32MX110F016B-I/SS)
- Lower-power peripheral core for energy-conscious designs (vsPIC32MX130F032B-50I/SS)
- Cost-optimized entry into PIC32 family (vsPIC32MX170F032B-50I/SS)
Ghi chú thiết kế
Decoupling: place a 0.1 uF ceramic capacitor within 5 mm of every VDD/VSS pair (pins 3/10/11 and 20/21/22 on the 28-SSOP), and add a single 4.7 uF bulk tantalum or ceramic capacitor near the MCU. The PIC32MX120F032B-50I/SS draws peaks above 25 mA when the MIPS core is active at 50 MHz; without local decoupling the supply sag can trigger POR. A ferrite bead plus 10 uF capacitor pair isolates analog VREF+ (pin 7) from digital noise. Use a star-ground topology with separate analog and digital ground planes that tie together at the VSS pin nearest the MCU.
Crystal placement: keep the 8 MHz to 40 MHz crystal or resonator within 10 mm of the OSCI (pin 12) and OSCO (pin 13) pins, with a continuous ground guard trace on the layer below. Keep high-speed digital traces (PMP, SPI) at least 5 mm away from the oscillator loop. If using the internal RC oscillator instead, leave pins 12/13 floating or as GPIO via PPS and ground the crystal traces. Route the ICSP PGECx/PGEDx pairs (pins 1/2 and 6/7) as a short, parallel pair with a ground shield for reliable in-circuit programming.
Peripheral Pin Select (PPS) lock: PPS mappings must be configured and then LOCKED before runtime to avoid accidental remapping by buggy firmware. PIC32MX120 has limited PPS output options on remappable pins - verify the exact mapping in the family datasheet's I/O chapter. Also avoid using PGEC1/PGED1 (pins 6/7) for JTAG-style debug on production firmware without a debug disable fuse, since this allows in-field firmware read-back. Configure the appropriate configuration bits in your linker script to lock the device against unauthorized readout. The CTMU requires an external current-setting resistor on a designated pin; omitting this resistor yields incorrect capacitance readings.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page; industrial temperature grade -I, not AEC-Q100 qualified for automotive applications. Use Microchip's automotive-grade /VAO or /Q equivalents for AEC-Q100 designs.
