MC68HC908QT2MDW - 8-bit 5V 1.5KB Flash MCU, SO-8 | NXP / Freescale
MPN: MC68HC908QT2MDW ✗ اختتامِ زندگیMC68HC908QT2MDW جائزہ
A HC08 family microcontroller is a Complex Instruction Set Computer (CISC) 8-bit MCU built on a Von Neumann architecture, in which program and data share a single internal bus. The QT2 sub-family is the lower-pin-count, smaller-memory derivative of the QY family, commonly used as a low-cost replacement for HC05 designs, where the 8-pin footprint, simple timer structure and on-chip analog peripherals are sufficient.
Key features of the MC68HC908QT2MDW include 2KB of Flash for application code, 128 bytes of on-chip RAM, an internal 8 MHz bus clock derived from an on-chip trimmable oscillator, an 8-channel 10-bit ADC (per the QY family header from which the QT2 is derived - device-specific channel count for QT2 needs verification), a 16-bit timer with input capture and output compare channels, an internal voltage regulator allowing a wide operating range (3 V to 5 V typical for the family), low-power wait and stop modes, an integrated POR/Brown-out reset, and a built-in COP watchdog. The MDW suffix designates the small-outline SO-8 (SOEIAJ) package and the automotive operating temperature grade.
The HC08 core uses a 16-bit stack pointer, hardware index registers (H:X) and a small instruction set with several addressing modes, simplifying code generation in assembly while still allowing efficient C compilation. Internal Flash memory is programmed via the on-chip Monitor ROM or via in-application programming in the application circuit. The part is a member of the cost-optimized HC908QT/QY family that competes against PIC10/12/PIC16F and low-end STM8P/STM32P devices in white-goods, lighting, appliance, simple sensor and remote-control designs.
Typical applications for the MC68HC908QT2MDW include low-end automotive body modules (window lift, mirror control, lighting drivers), small white-goods controllers (toasters, coffee machines, fans), battery chargers, LED drivers, simple sensor signal conditioners, infra-red remote receivers, and low-cost consumer electronics where the SO-8 footprint and HC08 toolchain (CodeWarrior, ICS08) provide a known migration path from older HC05 designs.
Designers should note that the MC68HC908QT2MDW is in the lower pin-count and lower memory bracket of the QY family; if more memory, more timers or more ADC channels are required, the MC68HC908QY series should be evaluated instead. Programming is performed through the single-wire background debug mode (BDM mode) interface on the IRQ/TCLK pin pair.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the bare manufacturer datasheet, so an engineer can quickly decide whether the MC68HC908QT2MDW is the right 8-bit MCU for a given SOP-8 board.
کے لیے ڈراپ اِن متبادل MC68HC908QT2MDW — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں MC68HC908QT2MDW (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Core Architecture, RAM Size, Number of I/O Pins, Program Memory Size, Package.
MC908QT2ACFQE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC908QT1ACFQE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC908QT1ACPE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MCHC908QY1MDWE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MCHC705JJ7CPE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC68HC908QT2MDW زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | M68HC08 (8-bit CISC, Von Neumann) |
| Family | HC08 (QT2 sub-family of QY) |
| Program Memory (Flash) | 2 KB |
| RAM | 128 bytes |
| Maximum Bus Frequency | 8 MHz (internal bus) |
| Supply Voltage Range | 3 V to 5 V (typical, per HC08 spec) |
| آپریٹنگ درجہ حرارت | Automotive grade (-40C to +125C) |
| Timers | 16-bit timer with input capture / output compare (per QY family header) |
| Watchdog | Yes (COP watchdog, on-chip) |
| Brown-out Reset | Yes (on-chip low-voltage detect) |
| Low-power Modes | Wait and Stop modes |
| پیکیج | SOEIAJ / SO-8 (gull-wing, 8 terminals) |
| پن کی تعداد | 8 |
| Debug Interface | Single-wire BDM (background debug mode) on IRQ/TCLK |
| Programming | On-chip Monitor ROM / in-application programming |
| AEC-Q100 | Automotive grade MDW suffix per Freescale part-number convention |
MC68HC908QT2MDW پن کنفیگریشن
| پن 1 | VDD — Power supply (3 V to 5 V typical) |
| پن 2 | VSS — Ground |
| پن 3 | PTA0 — Port A bit 0 / timer channel / IRQ |
| پن 4 | PTA1 — Port A bit 1 / timer channel / TCLK (BDM clock) |
| پن 5 | PTB0 — Port B bit 0 / ADC channel |
| پن 6 | PTB1 — Port B bit 1 / ADC channel |
| پن 7 | PTB2 — Port B bit 2 / ADC channel |
| پن 8 | PTB3 — Port B bit 3 / ADC channel / RESET_b |
عام استعمالات
MC68HC908QT2MDW کے لیے موزوں ہے 6 ایپلیکیشنs: Low-End Automotive Body Module, Small White-Goods Controller, LED Lighting Driver Controller, Battery Charger Controller, Sensor Signal Conditioner, Infra-Red Remote Receiver.
Low-End Automotive Body Module
The MC68HC908QT2MDW is well suited to low-end automotive body modules such as window-lift switches, mirror controllers, interior lighting drivers and seat-occupancy sensor interfaces where the SO-8 footprint and automotive -40C to +125C temperature grade are required. The 8-bit HC08 core running at up to 8 MHz internal bus is enough to read contact/button inputs, debounce them and drive relays or low-side FETs through GPIO. Its integrated COP watchdog and brown-out detector support the functional-safety expectations of body-electronics modules, while the 2 KB Flash holds the lookup tables for switch logic. Compared with HC908QY4 designs that use more pins, the QT2MDW keeps the BOM low by integrating everything in an SO-8 footprint with no external regulator required. For higher-current or higher-channel-count body modules the QY family should be evaluated.
تجویز کردہ
Small White-Goods Controller
In small white-goods such as toasters, coffee makers, fans and small kitchen appliances the MC68HC908QT2MDW provides a low-cost control MCU with on-chip Flash for timing curves and sensor thresholds. The 8 MHz internal bus is sufficient to handle temperature-sensor sampling, button debouncing, PWM-driven heating elements and triac-fired motor phases via the 16-bit timer's output-compare channels. The 128-byte RAM is enough for state-machine firmware without dynamic allocation, while the brown-out reset and COP watchdog guard against brown-out and firmware runaway in the noisy mains environment. Compared with a discrete 555-timer or HC05 design the QT2MDW integrates the timer, ADC and logic in one SO-8 part, reducing board area and BOM cost on high-volume appliances.
تجویز کردہ
LED Lighting Driver Controller
The MC68HC908QT2MDW is a good fit for dimmable LED bulb and fixture controllers where a constant-current driver IC needs a small MCU for dimming curves, color-temperature mixing and thermal foldback. The 16-bit timer's PWM output drives the constant-current driver's DIM input while the on-chip ADC samples an external NTC for thermal protection. The 2 KB Flash is large enough to store lookup tables for logarithmic dimming curves and color-temperature mixing, while the SO-8 footprint fits inside the confined base of an MR16 or PAR16 bulb. Compared with a discrete PWM-controller IC, the QT2MDW adds programmability and tunable dimming without external EEPROM.
تجویز کردہ
Battery Charger Controller
For low-rate NiMH, Li-ion or lead-acid battery charger boards the MC68HC908QT2MDW provides a control MCU that can run CC/CV charge profiles, sample battery voltage/temperature via the on-chip ADC, and drive charge-FET and indicator LEDs. The HC08's CISC instruction set makes it easy to express the charge-state machine in assembly while keeping code size inside the 2 KB Flash budget. The internal voltage regulator and brown-out reset operate directly from the charger supply, eliminating the need for an external supervisor. Compared with a dedicated charger ASIC, the QT2MDW supports chemistries and charge profiles that are field-upgradeable through the BDM interface.
تجویز کردہ
Sensor Signal Conditioner
The MC68HC908QT2MDW is well matched to low-cost sensor signal-conditioning boards that read analog sensors and output a calibrated analog or PWM signal. The on-chip ADC digitizes the bridge or thermistor output, while the timer's PWM output produces a 0-100% duty signal for downstream controllers. Internal Flash holds the calibration curve so the same board can be re-used across sensor variants. The automotive temperature grade also suits industrial -40C to +125C environments. Compared with a pure op-amp signal chain, the QT2MDW adds digital calibration and linearization at a similar BOM cost.
تجویز کردہ
Infra-Red Remote Receiver
For consumer IR remote receivers (TV, set-top box, audio) the MC68HC908QT2MDW provides an SO-2000-IR learning MCU that captures RC5/RC6/ NEC protocols via an external IR demodulator and outputs decoded commands over GPIO or UART. The timer's input-capture channel measures the IR carrier period precisely, while the 2 KB Flash stores the protocol bit patterns. The 128-byte RAM is sufficient for short command buffers. Compared with a dedicated IR-decoder ASIC, the QT2MDW supports multiple protocols in firmware and can be updated via the BDM interface. Low-power Stop mode keeps quiescent current low in standby.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا MC68HC908QT2MDW — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | MC908QT2ACFQE | MC908QT1ACFQE | MC908QT1ACPE | MCHC908QY1MDWE | MCHC705JJ7CPE |
|---|---|---|---|---|---|---|
| Package | SO-8 (SOEIAJ) | SO-8 (SOEIAJ) - same | SO-8 (SOEIAJ) - same | DIP-8 - different | SO-16 - different | DIP-20 - different |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HC08 (8-bit CISC) | HC08 | HC08 | HC08 | HC08 | HC05 |
| Flash | 2 KB | 2 KB | 1 KB (-50%) | 1 KB (-50%) | 1.5 KB (-25%) | 6 KB (+200%) |
| RAM | 128 B | 128 B | 128 B | 128 B | 128 B | 128 B |
| Bus Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 2 MHz (-75%) |
| Temperature Grade | Automotive (-40C to +125C) | Commercial (-40C to +85C) | Commercial (-40C to +85C) | Commercial (-40C to +85C) | Automotive (-40C to +125C) | Commercial (-40C to +85C) |
| Unit Price (1k pcs) | USD 1.05 | USD 0.95 | USD 0.85 | USD 0.90 | USD 1.10 | USD 1.20 |
اہم امتیازی خصوصیات
- Automotive temperature grade in SO-8 footprint (بمقابلہMC908QT2ACFQE)
- Larger Flash memory in same die (بمقابلہMC908QT1ACFQE / MC908QT1ACPE)
- Modern HC08 core vs older HC05 core (بمقابلہMCHC705JJ7CPE)
ڈیزائن نوٹس
Do not confuse the MC68HC908QT2 with the MC68HC908QY4 - the QY4 has a richer peripheral mix (more timers, more ADC channels and typically more pins) and is NOT a drop-in replacement. Check the family header section of the HC908QT/QY datasheet before selecting a substitute. Programming toolchain settings (target MCU) must match the chosen sub-family or the Monitor ROM will reject the S-record.
Place a 100 nF decoupling capacitor as close as possible to the VDD pin of the SO-8 footprint. Add a 10 uF bulk capacitor on the same node if the board draws more than 50 mA. Keep the BDM pair (PTA0/PTA1) traces short and away from switching nodes to avoid in-circuit programming failures. For automotive modules add a series resistor or ferrite bead on VDD to suppress injector transient noise.
The BDM (background debug mode) interface shares the PTA0/PTA1 pins with normal GPIO. After programming, leave these pins in a defined state (input with pull-up) to avoid glitches during reset. When using the timer for IR-capture or PWM on the same pins, disable the BDM pull-down in software to prevent contention. Refer to the family datasheet's BDM chapter for the recommended pull-up/pull-down values.
Estimated: At VDD=5 V, 8 MHz bus and 100% CPU load the MC68HC908QT2MDW draws roughly 10-15 mA active. In the SO-8 package with theta_JA around 150 C/W, the junction temperature rise above ambient is approximately 12-20 C at room temperature - well inside the -40C to +125C automotive range. No heatsink is required.
تعمیل کی معلومات
MDW suffix denotes the automotive temperature grade per Freescale part-number convention. AEC-Q100 qualification status inferred from the Freescale datasheet family header; RoHS/REACH/halogen status not stated in the verified web data. Conflict-minerals statement typically available via the NXP MCDS PDF (linked in data_sources).
