MC68HC908GZ8MFJ - 8MHz 8KB Flash HC08 MCU with CAN | NXP
Référence : MC68HC908GZ8MFJ ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $5.4 | $5,40 |
| 10 | $4.95 | $49,50 |
| 100 | $4.4 | $440,00 |
| 500 | $3.85 | $1 925,00 |
| 1 000 | $3.3 | $3 300,00 |
MC68HC908GZ8MFJ Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash), data memory (RAM), and a set of peripheral blocks onto one silicon die. The HC08 core uses an enhanced instruction set derived from the earlier M68HC05, with a stack-based architecture, 16-bit index registers, and a linear 64KB address space. Compared with larger ARM Cortex-M0 parts, the HC08 trades raw throughput for predictable interrupt latency, very low peripheral complexity, and long-term toolchain familiarity, which is why the family remains in production for safety subsystems, body controllers, and simple sensor nodes.
Key features of the MC68HC908GZ8MFJ include 21 general-purpose I/O lines, an enhanced PWM module, low-voltage detection (LVD) with power-on reset (POR), Flash program memory security, an on-chip clock generator that supports 1MHz to 8MHz crystals, and 8KB of in-application programmable Flash with security lock. The MSCAN08 block implements the Bosch CAN 2.0B active protocol (dated September 1991), and the device is qualified for the temperature range and ESD/EMC margins typical of automotive underhood and body modules.
The part uses a 2.7V to 5.5V single-supply architecture with low-power STOP and WAIT modes, making it suitable for body-electronics modules that must wake from CAN traffic. The 32-LQFP package supports standard surface-mount assembly and offers easy access to all peripheral pins for entry-level developers using NXP's HC08 tool chain and the on-chip bootstrap ROM for Flash programming without high voltage.
Typical applications include CAN-based body controllers, instrument cluster slaves, HVAC flap/motor controllers, simple sensor interfaces, and LIN/CAN gateway nodes. The wide operating voltage and built-in LVD/POR simplify automotive 12V battery-direct designs.
Designers should ensure the IRQ pin has a proper pull-up, route the CANH/CANL differential pair with 120-ohm termination, and use the on-chip COP watchdog to recover from bus stalls. The 32-LQFP ground/power pinout requires at least one decoupling capacitor per VDD pair and a single bulk cap near the package.
This page consolidates NXP datasheet specifications, distributor inventory signals, drop-in compatible parts within the HC08 family, and practical design notes not bundled on the manufacturer's product folder.
Alternatives de remplacement direct pour MC68HC908GZ8MFJ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68HC908GZ8CFA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908GZ8MFA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908GZ16MFJ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908GZ60MFJ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908GZ8JZ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908GZ8MFJ Valeurs maximales et caractéristiques électriques
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Maximum Bus Frequency | 8 MHz |
| Program Memory Size | 8 KB (8K x 8) FLASH |
| Program Memory Type | FLASH |
| RAM Size | 1 KB (1K x 8) |
| EEPROM Size | None on-die |
| Number of I/O Pins | 21 |
| Tension d'alimentation | 2.7 V to 5.5 V |
| Température de fonctionnement | -40 C to +125 C (automotive grade) |
| Connectivity | CANbus (MSCAN08, CAN 2.0B), LINbus, SCI, SPI |
| Peripherals | LVD, POR, PWM, COP Watchdog |
| Clock Source | Internal + external crystal (1 MHz to 8 MHz) |
| Boîtier | 32-LQFP (7 x 7 mm) |
| Type de montage | Surface Mount |
| Niveau MSL | 3 (per JEDEC J-STD-020) |
| AEC-Q100 | Qualified (automotive grade) |
Configuration des broches de MC68HC908GZ8MFJ
| Broche 1 | IRQ — External interrupt request input |
| Broche 2 | TCLK — Timer clock input (also PTA0/IOC0) |
| Broche 3 | PTA1 — General I/O / IOC1 |
| Broche 4 | PTA2 — General I/O / IOC2 |
| Broche 5 | PTA3 — General I/O / IOC3 |
| Broche 6 | PTA4 — General I/O / IOC4 |
| Broche 7 | PTA5 — General I/O / IOC5 |
| Broche 8 | VDDA — Analog supply voltage |
| Broche 9 | VSSA — Analog ground |
| Broche 10 | PTB0 — General I/O / PWM channel 0 |
| Broche 11 | PTB1 — General I/O / PWM channel 1 |
| Broche 12 | PTB2 — General I/O / PWM channel 2 |
| Broche 13 | PTB3 — General I/O / PWM channel 3 |
| Broche 14 | PTB4 — General I/O / PWM channel 5 |
| Broche 15 | PTB5 — General I/O / PWM channel 5 |
| Broche 16 | PTC0 — General I/O / CAN RX (MSCAN08) |
| Broche 17 | PTC1 — General I/O / CAN TX (MSCAN08) |
| Broche 18 | PTC2 — General I/O / SCI TXD |
| Broche 19 | PTC3 — General I/O / SCI RXD |
| Broche 20 | PTC4 — General I/O / SPI MOSI |
| Broche 21 | PTC5 — General I/O / SPI MISO |
| Broche 22 | PTC6 — General I/O / SPI SCK |
| Broche 23 | PTC7 — General I/O / SPI SS |
| Broche 24 | RST — Reset input (active low) |
| Broche 25 | OSC1 — Crystal oscillator input |
| Broche 26 | OSC2 — Crystal oscillator output |
| Broche 27 | VDD — Digital supply voltage |
| Broche 28 | VSS — Digital ground |
| Broche 29 | BKGD — Background debug mode pin |
| Broche 30 | PTD0 — General I/O / SCI TXD alt |
| Broche 31 | PTD1 — General I/O / SCI RXD alt |
| Broche 32 | VSS — Digital ground (second) |
Applications typiques
MC68HC908GZ8MFJ convient pour 7 applications: CAN-Based Automotive Body Controller, HVAC Flap and Blower Motor Controller, Instrument Cluster Slave Display, Industrial CAN Sensor Node, LIN/CAN Gateway Slave, Low-Cost Automotive Window/Lift Control Module, Battery-Management Slave Cell Monitor.
CAN-Based Automotive Body Controller
The MC68HC908GZ8MFJ's integrated MSCAN08 controller (CAN 2.0B, Bosch September 1991) plus 21 GPIO and PWM channels makes it well suited for body-control modules such as door-lock, lighting, and mirror controllers. The 8 MHz bus at 2.7-5.5 V gives a deterministic interrupt response that simplifies CAN frame timing. Compared with a discrete CAN transceiver plus 8-bit MCU approach, the on-chip MSCAN08 saves board area and lets the firmware handle CAN state changes directly, with the on-chip COP watchdog recovering the node from bus-stall conditions.
Recommandé
HVAC Flap and Blower Motor Controller
The MC68HC908GZ8MFJ's PWM and 1 KB RAM are sufficient for closed-loop blower and HVAC flap control, and its MSCAN08 interface allows the module to appear as a CAN node on the vehicle network. The PWM block provides the modulation needed to drive a small DC blower via a MOSFET bridge, and the ADC reads temperature and position feedback. Because the part runs from 5 V, it can share the blower-driver supply rail without additional level translation, which reduces BOM cost in compact HVAC modules.
Recommandé
Instrument Cluster Slave Display
The HC08 core's deterministic interrupt latency and the GZ8's SPI peripheral make the MC68HC908GZ8MFJ a good fit for slave display controllers behind an instrument cluster master. The MCU receives CAN frames from the master via MSCAN08 and drives a peripheral display driver over SPI. With 8 KB Flash the firmware easily fits a small lookup table for symbol rendering, and the 32-LQFP package gives easy access to all peripheral pins for the display-driver signals.
Recommandé
Industrial CAN Sensor Node
The MC68HC908GZ8MFJ is widely used in industrial CANopen and DeviceNet slave nodes such as proximity, level, or temperature sensors. Its 21 GPIO and ADC channels can read multiple sensors and publish the data on CAN, while the LVD/POR block ensures clean resets in noisy 24 V industrial environments. The AEC-Q100 grade also tolerates temperature and ESD swings that occur near motor drives, which makes the part attractive for factory-floor instrumentation where a more expensive 32-bit MCU is not justified.
Recommandé
LIN/CAN Gateway Slave
For low-cost LIN sub-bus nodes that also need to participate in CAN traffic, the MC68HC908GZ8MFJ combines an SCI (UART) for LIN with MSCAN08 for CAN. The part can run a simple LIN 1.x slave stack plus a CAN listener without exhausting 8 KB Flash. Designers should reserve one PWM channel for the LIN-controlled power management, and use the on-chip COP watchdog to recover from LIN bus silence, which is the most common failure mode in LIN body subnets.
Recommandé
Low-Cost Automotive Window/Lift Control Module
Window-lift controllers need a small MCU with PWM, ADC, and a CAN interface, plus enough Flash for end-of-travel, anti-pinch, and diagnostic routines. The MC68HC908GZ8MFJ's 8 KB Flash fits these routines on simpler regulators, and the AEC-Q100 grade tolerates the cold-crank transients on the 12 V battery rail. The MSCAN08 block shares window status with the central body controller over CAN, while the on-chip PWM drives the lift motor through an external half-bridge.
Recommandé
Battery-Management Slave Cell Monitor
Although the MC68HC908GZ8MFJ does not include a dedicated cell-balancing interface, the ADC and SPI peripherals are sufficient to read a small external cell-balancing front end such as a daisy-chained ADC. The MSCAN08 block carries the cell readings to a central battery controller over CAN. The 32-LQFP is compact enough to fit on a per-cell slave PCB, and the AEC-Q100 grade handles the harsh thermal environment of a battery pack. For more cells or more math, move to the GZ16 or GZ60 variants.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68HC908GZ8MFJ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC68HC908GZ8CFA | MC68HC908GZ8MFA | MC68HC908GZ16MFJ | MC68HC908GZ60MFJ | MC68HC908GZ8JZ |
|---|---|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP - same | 32-LQFP - same | 32-LQFP - same | 32-LQFP - same | 32-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | HC08, 8-bit | HC08, 8-bit | HC08, 8-bit | HC08, 8-bit | HC08, 8-bit | HC08, 8-bit |
| Bus Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Flash Memory | 8 KB | 8 KB | 8 KB | 16 KB | 60 KB | 8 KB |
| RAM | 1 KB | 1 KB | 1 KB | 2 KB | 2 KB | 1 KB |
| MSCAN08 (CAN 2.0B) | Yes | Yes | Yes | Yes | Yes | Yes |
| Temperature Grade | Automotive (-40 to +125 C) | Commercial | Automotive | Automotive | Automotive | Automotive |
Principaux différenciateurs
- 8 KB Flash with on-chip CAN 2.0B controller (vs MC68HC908GZ8CFA)
- Highest-in-family Flash for firmware expansion (vs MC68HC908GZ16MFJ)
- Pin-compatible 32-LQFP form factor across the family (vs MC68HC908GZ8JZ)
Notes de conception
Estimated: assuming VDD = 5.0 V, VDD current ~25 mA at 8 MHz in run mode, the power dissipation is P = 5 V x 25 mA = 0.125 W. This is well within the thermal budget of the 32-LQFP package. Place a 0.1 microfarad ceramic decoupling cap on each VDD/VSS pair and one 10 microfarad tantalum or ceramic bulk capacitor within 25 mm of the package to control supply ringing when the PWM or CAN transceivers switch.
Route the CANH and CANL differential pair from the MSCAN08 pins (CANTX/CANRX) to the external CAN transceiver with a 120-ohm characteristic impedance and 120-ohm termination at the bus ends. Keep the pair length under 1 meter on the PCB side. The crystal traces (OSC1/OSC2) should be short, surrounded by a ground pour, and kept clear of the PWM and CAN lines to avoid clock frequency shift.
Do not leave the RST pin floating - tie it to VDD through a 10 kohm pull-up and to a 0.1 microfarad cap for the POR delay. The BKGD pin must be pulled high during reset for normal operation; if the application never uses background debug mode, a 10 kohm pull-up to VDD keeps the part out of bootstrap mode. Leaving RST or BKGD floating can cause intermittent failure to start on cold-crank events.
The SCI and SPI pins on PTC0-PTC7 are 5 V tolerant only when VDD = 5 V. If the design migrates to 3.3 V peripherals, add a logic-level translator or rely on the 5 V tolerance window of the slave devices. When driving long SPI cables or optical isolators, add 50 Ω series damping at the source to control ringing and reflections at 8 MHz.
Informations de conformité
AEC-Q100 qualification noted on the NXP datasheet. RoHS/REACH/lead-free/halogen-free status not confirmed from the provided sources and is marked 'unknown'. Conflict-minerals compliance follows NXP's standard policy.