MC68HC908GT16CB - 8-Bit 8MHz 16KB FLASH HC08 MCU | NXP 42-PDIP
MPN: MC68HC908GT16CB ✗ Tapus ng BuhayMC68HC908GT16CB Ulas
A microcontroller (MCU) is a single-chip computer that contains a processor core, program memory, data memory, and peripheral interfaces on one integrated circuit. The HC08 family is an 8-bit CMOS architecture descended from the original Motorola 6800, offering a low-cost, high-performance upgrade path for legacy 68HC05 designs. The MC68HC908GT16CB belongs to the GT series, which is optimized for general-purpose embedded control with an integrated 10-bit ADC for analog signal acquisition.
Key features include 16KB of on-chip FLASH for program storage, 512 bytes of RAM for data, a 16-channel 10-bit analog-to-digital converter, a serial communications interface (SCI), a serial peripheral interface (SPI), and a 6-channel timer interface. The device operates from a single 3V to 5.5V supply, supports a maximum internal bus frequency of 8 MHz (equivalent to 8 MIPS), and includes a low-voltage inhibit (LVI) module for brown-out protection. An on-chip in-circuit programmable FLASH allows firmware updates without removing the device from the board.
Architecturally, the MC68HC908GT16CB uses the HC08 CPU core with a 16-bit stack pointer, 16-bit index register, and an 8-bit accumulator-based programming model. The integrated analog multiplexer routes up to 16 external channels into the 10-bit successive-approximation ADC, supporting ratiometric measurements when the supply is used as the reference. FLASH memory is organized in pages and supports both in-circuit programming and security-locked modes for IP protection.
Typical applications include HVAC control modules, appliance user interfaces (washing machines, microwaves), automotive body controllers (window lift, seat control), security alarm panels, and battery-powered sensor readers. The 16-channel ADC and 8 MHz bus speed strike a balance between analog measurement capability and deterministic control-loop performance for these mid-tier embedded systems.
When designing with this part, ensure the oscillator and reset circuits follow the datasheet recommended layout. The device's 42-pin PDIP footprint simplifies breadboarding and hand-soldered prototypes. Watch for the minimum VDD ramp time for proper FLASH programming and verify the LVI threshold matches your supply tolerance for reliable brown-out behavior.
Mga alternatibo na pwedeng ilagay na MC68HC908GT16CB — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok MC68HC908GT16CB (parehas na form factor at footprint) — pagkakaiba sa ADC, Core Architecture, Mounting Type, Package.
MC68HC908GT16CFB
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →MC68HC908GT8CB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MC68HC908GT16CBE
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MC68HC08GT16CB
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MC68HC908GT16CFA
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MC68HC908GT16CB Mga Pinakamataas na Rating at Electrical Characteristics
| Core Architecture | HC08 (8-bit) |
| Program Memory | 16 KB FLASH |
| RAM | 512 bytes |
| Maximum Bus Frequency | 8 MHz |
| Volte ng Pagbibigay | 3 V to 5.5 V |
| ADC | 10-bit, 16 channels |
| Packhaging | 42-pin PDIP (through-hole) |
| Uri ng Pagpapasok | Through-Hole |
| SCI (UART) | 1 channel |
| SPI | 1 channel |
| Timer Channels | 6 channels (TPM) |
| Temperature na Operasyon | -40C to +85C (industrial) |
| LVI (Brown-out) | Yes (Low-Voltage Inhibit) |
| On-chip Programming | FLASH in-circuit programmable |
Gabay sa Pin Configuration ng MC68HC908GT16CB 42-pin pdip (through-hole)
Pin configuration para sa MC68HC908GT16CB (42-pin pdip (through-hole) package). Kasama sa digital IC na ito ang GPIO, mga communication interface (UART, SPI, I2C), at mga power pin. Sumangguni sa datasheet ng manufacturer para sa mga alternatibong function ng pin at mga opsyon sa configuration. Mahalaga para sa disenyo ng embedded system at PCB layout.
Wala ng detalyadong pinout data na magagamit para sa MC68HC908GT16CB.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
MC68HC908GT16CB ay nararapat para sa 7 aplikasyons: HVAC Climate Control Modules, Home Appliance User Interfaces, Automotive Body Controllers, Security Alarm Panels, Industrial Sensor Readers, Battery-Powered Data Loggers, Educational Embedded Training Kits.
HVAC Climate Control Modules
The MC68HC908GT16CB fits HVAC control modules because its 16-channel 10-bit ADC can read multiple thermistor inputs (supply-air, return-air, ambient, coil, and discharge sensors) simultaneously, while the 6-channel TPM timer drives TRIAC-based fan and damper actuators. With 16 KB of FLASH it holds scheduling firmware for multi-zone setpoint logic and the SCI port drives a remote wall-thermostat or Modbus display. Operating from 3 V to 5.5 V at industrial temperatures, it powers directly from a 5 V rectified rail; unlike a Cortex-M0, it costs less per unit and has decades of proven HC08 firmware support, though it lacks modern security features.
Inirekomenda
Home Appliance User Interfaces
Washing machines, dishwashers, and microwave ovens benefit from the MC68HC908GT16CB's 16 KB FLASH (enough for cycle state machines, beep libraries, and LCD segment drivers) and its 8 MHz 8-bit HC08 throughput, which executes each FSM transition in tens of nanoseconds. The 16-channel ADC reads water-level, turbidity, and motor-current sensors; the SCI port talks to inverter boards; and the SPI port drives LED or VFD displays. Unlike 32-bit Cortex-M0 designs, it requires no firmware library licensing and draws only a few mA active, lowering BOM cost in price-sensitive appliances.
Inirekomenda
Automotive Body Controllers
The MC68HC908GT16CB historically powered window-lift, seat-control, mirror-fold, and door-lock body modules because its 16-channel ADC reads LIN-bus analog sensors and its 6-channel TPM timer generates PWM for mirror and seat motors. With 16 KB FLASH it stores VIN-keyed calibration; the SCI port interfaces to the body control module over UART or LIN. Operating from 3 V to 5.5 V with industrial temperature tolerance, it survives engine-bay thermal stress on non-AEC-Q100 body locations; for AEC-Q100 under-hood designs, migrate to the S12 or S32K families instead.
Inirekomenda
Security Alarm Panels
The MC68HC908GT16CB suits security alarm panels where its 16-channel 10-bit ADC reads multiple PIR motion, glass-break, smoke, and door-magnetic sensors, while 16 KB FLASH holds partition logic and event logs. The SCI port interfaces with GSM or Ethernet alarm communicators; the SPI port drives keypad scan matrices or RFID readers. Unlike 32-bit MCUs, it boots in milliseconds from a single 5 V rail with no external watchdog needed; the on-chip LVI module guards against brown-out during power-loss events typical of alarm backup-battery transitions.
Inirekomenda
Industrial Sensor Readers
Industrial 4-20 mA loop-powered transmitters and RTD/thermocouple readers use the MC68HC908GT16CB's 10-bit ADC and 8 MHz HC08 core to digitize analog sensor signals at low cost. The 16 KB FLASH holds calibration tables, linearization routines, and HART or Modbus protocol stacks on the SCI port; the SPI port drives an external DAC for 4-20 mA loop output. Operating from 3 V to 5.5 V, it powers directly from loop supplies or 24 V industrial rails; unlike 32-bit MCUs, the HC08's deterministic interrupt latency simplifies IEC 61508 SIL2 firmware development.
Inirekomenda
Battery-Powered Data Loggers
Low-cost battery-powered data loggers benefit from the MC68HC908GT16CB's HC08 core, which enters a sub-mA wait mode between ADC conversions to extend battery life. The 16-channel ADC reads thermistor, voltage, and current sensors; 16 KB FLASH stores timestamped log records; the SCI port forwards data to a host over UART or Bluetooth bridge. Operating from 3 V to 5.5 V, it runs from two AA cells or a single Li-ion; unlike 32-bit Cortex-M0 designs, it requires no RTOS, lowering both BOM cost and firmware complexity for simple logging applications.
Inirekomenda
Educational Embedded Training Kits
Universities and embedded-systems training programs use the MC68HC908GT16CB in 42-PDIP because its DIP form factor accepts breadboard and through-hole sockets, simplifying student labs. With 16 KB FLASH, students can program in-circuit and re-flash without chip removal; the 16-channel ADC, SCI, and SPI expose all major peripherals for hands-on learning. The HC08 assembly instruction set teaches fundamentals; unlike modern Cortex-M0 kits, the MC68HC908GT16CB has decades of tutorial material and is widely available on the secondary market as an obsolete but inexpensive 8-bit learning platform.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for MC68HC908GT16CB — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | MC68HC908GT16CFB | MC68HC908GT8CB | MC68HC908GT16CBE | MC68HC08GT16CB | MC68HC908GT16CFA |
|---|---|---|---|---|---|---|
| Package | 42-PDIP | 44-QFP | 42-PDIP | 42-SDIP | 42-PDIP | 44-QFP |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| FLASH Program Memory | 16 KB | 16 KB | 8 KB (-50%) | 16 KB | 16 KB ROM (mask) | 16 KB |
| Bus Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| ADC Channels | 16 ch x 10-bit | 16 ch x 10-bit | 16 ch x 10-bit | 16 ch x 10-bit | 16 ch x 10-bit | 16 ch x 10-bit |
| Memory Type | FLASH (in-circuit programmable) | FLASH | FLASH | FLASH | Mask ROM (no field updates) | FLASH (AEC-Q100) |
| Automotive Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial | Industrial | Automotive (AEC-Q100) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Pangunahing mga Pagkakaiba
- Through-hole 42-PDIP package for easy prototyping (kumpara saMC68HC908GT16CFB)
- Larger 16 KB FLASH for firmware growth (kumpara saMC68HC908GT8CB)
- FLASH for in-circuit updates (kumpara saMC68HC08GT16CB)
Talaan ng Disenyo
The 42-PDIP package simplifies breadboard prototypes but requires through-hole plating and larger PCB area than the equivalent 44-QFP. Place VDD bypass capacitors (100 nF ceramic plus 10 uF tantalum) within 5 mm of pins 10 (VDD) and 11 (VSS), and route the analog AVdd/AVss pair separately from digital VDD/VSS to keep ADC readings clean; per the Freescale MC68HC908GT16 Rev. 5.0 data sheet section on analog supply layout.
The MC68HC908GT16CB is obsolete and may only be sourced through independent distributors and aftermarket brokers; verify lot date codes and avoid parts without traceability. For new designs, evaluate the MC9S08GB60A or S08QE128 for a modern HC/S08 migration path with active production status, rather than designing in an obsolete part that may become unavailable mid-product life cycle.
Estimated: at VDD = 5 V and active current of approximately 15 mA (typical for HC08 at 8 MHz), the MCU dissipates about 75 mW. In wait mode current drops to under 2 mA, allowing battery-backed designs to budget for 1-2 mA average draw. Always include the LVI module in firmware to trigger a clean reset when VDD falls below the 3 V threshold, preventing FLASH corruption during brown-out conditions per the Freescale data sheet.
Impormasyon ng Pagsunod sa Kautusan
RoHS, REACH, lead-free, and halogen-free status for MC68HC908GT16CB were not present in the Verified Web Data; the part is marked obsolete by NXP. AEC-Q100 is not qualified - for automotive applications choose the MC68HC908GT16CFA variant.
