MC908JB16FAE - 8-Bit HC08 MCU, 16KB Flash, USB, 32-LQFP | NXP
MPN: MC908JB16FAE ✗ Akhir HidupMC908JB16FAE Ringkasan
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (Flash/ROM), working memory (RAM), and a set of peripheral interfaces (USB, timers, ADC, GPIO, SCI). The MC908JB16FAE belongs to the Freescale/NXP HC08 family of 8-bit CISC microcontrollers, the predecessor to the S08 and Kinetis families. By embedding a USB 1.1 (full-speed, 12 Mbps) device transceiver with on-chip 3.3 V regulator and 1.5 kΩ software-configurable pull-up on the D- line, this MCU eliminates the discrete PHY + serial-jtag converter required by earlier 8051-based USB designs, simplifying BOM and reducing board area.
Key features include 6 MHz internal bus clock, 21 general-purpose I/O pins (shared with USB, SCI, timer, and interrupt functions), built-in peripherals (LED driver, low-voltage detect, power-on reset, PWM, SCI), 16 KB Flash program memory with in-application programming support, 384 B RAM, and a 32-pin LQFP industrial-grade operating range of 0 C to +70 C (industrial variants available). The integrated USB module supports control, interrupt, bulk, and isochronous endpoints, sufficient for HID, CDC/ACM, and vendor-class device firmware.
The HC08 CPU core uses a Von Neumann memory architecture with a 16-bit stack pointer and a small unified instruction set optimized for code density (typical instructions are 1-3 bytes). The internal oscillator and phase-locked loop allow flexible system clock generation without an external crystal in some configurations, while the USB module requires a 48 MHz clock derived from the PLL for full-speed signaling. This architecture trades raw clock speed (6 MHz) for low power and deterministic interrupt latency, which suits HID polling loops and low-bandwidth USB CDC streams.
Typical applications include USB HID peripherals (mice, keyboards, custom input devices), USB-to-UART bridge dongles (replacing FTDI-style cables), embedded USB learning kits, industrial data-loggers with USB diagnostics, and point-of-sale peripherals. The integrated pull-up and embedded voltage regulator mean a USB device can be built with this MCU plus a few passives, no external USB PHY chip required.
When designing with this part, note that the HC08 instruction set, while capable, requires the legacy CodeWarrior HC08 toolchain (now superseded by S08/Kinetis tools); firmware migration to newer NXP families is recommended for new designs. USB firmware must implement the device-state machine per USB 1.1 specification to achieve enumeration. For new designs, consider the Freescale/NXP S08JM60 or Kinetis KE series as modern drop-in USB-enabled successors, though they require new toolchains and may differ in peripheral mapping.
This page synthesizes distributor pricing, pin-compatible alternatives, application references, and practical design notes that are not collated in the manufacturer datasheet alone.
Alternatif penggantian untuk MC908JB16FAE — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC908JB16FAE (sama faktor bentuk dan footprint) — berbeda di dalam Package, Core Architecture, Maximum Clock Frequency, Operating Supply Voltage, Operating Temperature.
MC908JB16FPE
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MC908JB8FAE
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MC908JL16CFJE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC908JB16FAE Rating Maksimal & Karakteristik Listrik
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Core Architecture | CISC (Von Neumann) |
| Frekuensi Bawah Maximum | 6 MHz (internal bus) |
| Program Memory Size | 16 KB (16K x 8) Flash |
| RAM Size | 384 B |
| Connectivity | SCI, USB |
| USB Interface | USB 1.1 full-speed (12 Mbps) device, integrated PHY + 3.3 V regulator + 1.5 kOhm pull-up |
| Number of I/O Pins | 21 |
| Peripherals | LED driver, LVD, POR, PWM, SCI |
| Paket | 32-LQFP (7x7 mm) |
| Tegangan Pemuat Kerja | 4.0 V to 5.5 V (USB active) |
| Suhu Kerja | 0 C to +70 C |
| Tipe Mounting | Surface Mount |
| Part Status | Obsolete (per third-party distributor listings) |
Konfigurasi Pin MC908JB16FAE
| Pin produk 1 | IRQ — External interrupt request input |
| Pin produk 2 | PTA0 — Port A bit 0 (GPIO) |
| Pin produk 3 | PTA1 — Port A bit 1 (GPIO) |
| Pin produk 4 | PTA2 — Port A bit 2 (GPIO) |
| Pin produk 5 | PTA3 — Port A bit 3 (GPIO) |
| Pin produk 6 | PTA4 — Port A bit 4 (GPIO) |
| Pin produk 7 | PTA5 — Port A bit 5 (GPIO) |
| Pin produk 8 | PTA6 — Port A bit 6 (GPIO) |
| Pin produk 9 | PTA7 — Port A bit 7 (GPIO) |
| Pin produk 10 | VSS — Ground |
| Pin produk 11 | PTB0/TxD — Port B bit 0 / SCI transmit (shared) |
| Pin produk 12 | PTB1/RxD — Port B bit 1 / SCI receive (shared) |
| Pin produk 13 | PTB2 — Port B bit 2 (GPIO) |
| Pin produk 14 | PTB3 — Port B bit 3 (GPIO) |
| Pin produk 15 | PTB4 — Port B bit 4 (GPIO) |
| Pin produk 16 | PTB5 — Port B bit 5 (GPIO) |
| Pin produk 17 | PTB6 — Port B bit 6 (GPIO) |
| Pin produk 18 | PTB7 — Port B bit 7 (GPIO) |
| Pin produk 19 | VDD — Positive supply (4.0 V to 5.5 V) |
| Pin produk 20 | VREG — Internal 3.3 V regulator output for USB |
| Pin produk 21 | RST — Reset input (active low) |
| Pin produk 22 | OSC1 — Crystal oscillator input |
| Pin produk 23 | OSC2 — Crystal oscillator output |
| Pin produk 24 | PTE0 — Port E bit 0 (GPIO) |
| Pin produk 25 | PTE1 — Port E bit 1 (GPIO) |
| Pin produk 26 | PTE2 — Port E bit 2 (GPIO) |
| Pin produk 27 | PTE3/D+ — USB D+ data line (shared with GPIO) |
| Pin produk 28 | PTE4/D- — USB D- data line with 1.5 kOhm pull-up (shared with GPIO) |
| Pin produk 29 | PTE5 — Port E bit 5 (GPIO) |
| Pin produk 30 | PTE6 — Port E bit 6 (GPIO) |
| Pin produk 31 | PTE7 — Port E bit 7 (GPIO) |
| Pin produk 32 | NC — Not connected (per datasheet) |
Aplikasi Umum
MC908JB16FAE cocok untuk 6 aplikasis: USB HID Input Device, USB-to-UART Bridge Dongle, Industrial USB Data Logger, Point-of-Sale USB Peripheral, USB Learning and Development Board, Embedded USB Diagnostics Dongle.
USB HID Input Device
The MC908JB16FAE is well suited for USB HID class input devices (mice, keyboards, custom controls, game pads) because its integrated USB 1.1 full-speed device controller eliminates the external USB PHY and serial-jtag converter required by 8051-based designs. The HC08 core at 6 MHz is sufficient for HID polling loops (typically 125 us frame interval) and the 21 GPIO pins map cleanly to scanned matrix keypads, optical sensors, and switch arrays. The 16 KB Flash holds a full HID descriptor table plus custom report logic, and the 384 B RAM covers report buffers and stack. The 1.5 kOhm software-configurable D- pull-up simplifies bus-powered device design where VBUS presence must trigger enumeration.
Direkomendasikan
USB-to-UART Bridge Dongle
Use the MC908JB16FAE as a CDC/ACM USB-to-UART bridge dongle, replacing FTDI-style cables with a custom firmware implementation. The integrated USB device controller and SCI peripheral (asynchronous serial) give the part a direct bus between the USB endpoint buffers and the UART transmit/receive registers. The 6 MHz bus clock supports CDC line-coding (baud rate up to 921600 bps with appropriate SCI divisor), and the 16 KB Flash accommodates the USB CDC descriptor stack and the UART handler. The internal 3.3 V regulator powers the USB transceiver from the 5 V VBUS, so an external LDO is not required.
Direkomendasikan
Industrial USB Data Logger
The MC908JB16FAE fits compact industrial USB data loggers where a low-pin-count MCU with USB diagnostics is needed and external interfacing is minimal. The 21 GPIO pins can be allocated to digital sensors, the SCI peripheral connects to RS-485 transceivers via external line drivers, and the integrated LED driver directly indicates logging state without external transistors. The LVD (low-voltage detect) and POR (power-on reset) peripherals handle brown-out recovery, important for industrial environments where supply rails are noisy. The 32-LQFP (7x7 mm) is easy to hand-prototype on 2-layer PCBs.
Direkomendasikan
Point-of-Sale USB Peripheral
Use the MC908JB16FAE in point-of-sale peripherals (barcode scanners, mag-stripe readers, customer displays) where USB connection to the host PC is mandatory and device firmware is simple HID or vendor-class. The integrated USB 1.1 PHY, on-chip 3.3 V regulator, and 1.5 kOhm pull-up minimize BOM cost for high-volume POS device production. The HC08 core's deterministic interrupt latency suits HID polling, and the 16 KB Flash stores the HID descriptor, scan firmware, and key debounce state machines. The PWM peripheral drives the scanner laser or beeper without external timer ICs.
Direkomendasikan
USB Learning and Development Board
The MC908JB16FAE was a popular USB learning MCU because it integrates USB with a simple HC08 instruction set, allowing students to study enumeration, HID descriptors, and interrupt-driven USB firmware without an external PHY. Educational kits based on this part include breakout to all 21 GPIO, a USB-B connector, and a BDM (background debug mode) header for in-circuit programming. The 32-LQFP is breadboard-friendly with adapter boards, and the legacy CodeWarrior HC08 toolchain is freely available from Freescale/NXP archives for self-study.
Direkomendasikan
Embedded USB Diagnostics Dongle
The MC908JB16FAE is suitable for embedded diagnostics dongles that report internal bus voltage, temperature, or error counters to a host PC over USB. Its integrated USB 1.1 device, SCI peripheral for sensor readback, and PWM peripheral for fan or LED control let a small firmware image replace a more expensive processor. The 16 KB Flash accommodates the USB vendor-class driver on the host side plus the on-device diagnostics state machine. The LQFP-32 footprint is footprint-compatible with NXP S08JM60 parts, easing later migration to active NXP silicon for production.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC908JB16FAE — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC908JB16FPE | MC908JB8FAE | MC908JL16CFJE |
|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core Processor | HC08 8-bit | HC08 8-bit | HC08 8-bit | HC08 8-bit |
| Maximum Bus Clock | 6 MHz | 6 MHz | 6 MHz | 8 MHz |
| Program Memory (Flash) | 16 KB | 16 KB | 8 KB | 16 KB |
| RAM Size | 384 B | 384 B | 384 B | 512 B |
| Integrated USB Controller | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | Yes (USB 1.1 FS device + PHY + 3.3 V reg) | No (SCI/SPI only) |
| Number of I/O Pins | 21 | 21 | 21 | 23 |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C (industrial) | 0 C to +70 C | -40 C to +85 C (industrial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Diferensiator Kunci
- Integrated USB 1.1 PHY + 3.3 V regulator + 1.5 kOhm pull-up (vsMC908JL16CFJE)
- 16 KB Flash vs 8 KB Flash in the JB8 (vsMC908JB8FAE)
- Industrial-temperature sibling available (vsMC908JB16FPE)
Catatan Desain
The MC908JB16FAE operates from a single 4.0 V to 5.5 V supply on VDD; the integrated USB VREG pin must be bypassed with a 1 uF ceramic capacitor to VSS per the datasheet, and a 1.5 kOhm pull-up on D- is software-enabled (not a discrete pull-up). When designing a bus-powered USB device, ensure VBUS is sensed on the RST or a dedicated GPIO so firmware can disconnect the pull-up when VBUS drops. Decouple VDD with 100 nF plus 4.7 uF bulk, placed within 5 mm of the VDD pin.
Do not assume the MC908JB16FAE and the industrial-grade MC908JB16FPE share identical electrical specs; the FPE suffix changes temperature range from 0 C to +70 C to -40 C to +85 C and may differ in Flash endurance specs across lots. Also note that some Freescale-prefixed date codes predate NXP acquisition and may use legacy HC08 BDM pod pinout; the BDM connector pinout is the same across both brands, but tooling firmware in older CodeWarrior HC08 versions may need to be updated. When migrating firmware from the JL16 family (no USB) to the JB16 (with USB), expect to remap shared peripheral pins (e.g., PTB0/TxD, PTE3/D+) and re-initialize the USB module registers.
Place the 32 kHz crystal (or resonator) within 5 mm of OSC1 and OSC2, with a ground guard trace around both pins to minimize EMI pickup into the PLL. Route the USB D+ and D- differential pair as a 90-ohm differential trace, matched within 2 mm of length, and keep them clear of switching signals and clock traces. The D- pull-up resistor (internal, software-enabled) and the VREG capacitor must both be placed on the same side of the package as the USB connector for shortest return paths.
The MC908JB16FAE in the 32-LQFP (7x7 mm) has a moderate theta_JA suitable for handheld and bus-powered devices where current consumption stays below approximately 25 mA. The integrated USB 3.3 V regulator draws from VDD and adds approximately 30 mA when USB is active, so total VDD current with USB enumerated is roughly 50 mA. The 32-LQFP plastic package dissipates this without a heatsink on a standard 2-layer board; for sealed industrial enclosures, add a thermal copper pour under the exposed pad area if available, or vent the enclosure.
Informasi Konformitas
RoHS, REACH, lead-free, halogen-free status marked [DATA_NEEDED] - not present in the verified web data reviewed. AEC-Q100 not applicable because MC908JB16FAE is a general-purpose MCU without automotive qualification. Compliance verification requires the manufacturer lot-specific datasheet addendum or a NXP product compliance statement.