HT45F8650 - 8-Bit Li-Battery Protection Flash MCU | Holtek
Référence : HT45F8650 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.95 | $1,95 |
| 10 | $1.76 | $17,60 |
| 100 | $1.56 | $156,00 |
| 500 | $1.41 | $705,00 |
| 1 000 | $1.27 | $1 270,00 |
HT45F8650 Présentation
A battery management MCU is a class of embedded controller that combines battery-specific analog front-end functions with a general-purpose processor core, sitting within the hierarchy of 8-bit Flash MCUs used in power management and battery protection integrated circuits. The accumulative cell voltage monitor outputs a divide-by-N voltage of the stacked cells to the analog multiplexer with a ±0.5% divided ratio accuracy, which is then digitized by the internal 12-bit ADC.
Key features include up to 36V maximum input voltage tolerance, 8KB of Flash program memory, 512 bytes of RAM data memory, and True EEPROM for storing serial numbers and calibration data. Flash multiple-program capability simplifies firmware iteration, while the integrated MOSFET gate drivers eliminate external driver ICs and reduce bill-of-materials cost.
Architecturally, the device uses Holtek's high-performance 8-bit RISC core with multiple flexible Timer Modules providing timing, pulse generation, and PWM output functions. Complete SPI, I2C, and UART interfaces allow straightforward communication with external hardware such as fuel gauges, displays, or host controllers.
Typical applications include handheld measurement instruments, electric power tools, handheld hair dryers, and handheld vacuum cleaners - portable battery-powered products where accurate cell monitoring and reliable charge/discharge protection are mandatory safety requirements.
A key design consideration is that the OCP (over-current protection) circuit power source can be selected between a general I/O pin and VDD (5V); pins such as PA0 and PA3 may host two coexisting functions but cannot use both simultaneously, so pin assignment must be planned early.
This page synthesizes verified datasheet excerpts, distributor pricing context, same-family drop-in options, and practical BMS design notes not found together on the manufacturer site.
Alternatives de remplacement direct pour HT45F8650 — 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 :
HT45F8550
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
HT45F8660
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
HT45F8650 Valeurs maximales et caractéristiques électriques
| Core | 8-bit RISC |
| Flash Program Memory | 8 KB |
| RAM Data Memory | 512 B |
| EEPROM | True EEPROM (for serial numbers, calibration data) |
| Battery Cell Count | 3 to 8 cell Li-ion |
| Maximum Input Voltage | 36 V |
| ADC Resolution | 12-bit, multi-channel |
| Cell Voltage Monitor Accuracy | ±0.5% divided ratio accuracy |
| Discharge MOSFET Gate Drivers | 2 (N-type) |
| Charge MOSFET Gate Driver | 1 (N-type) |
| Comparator | 1 integrated comparator |
| Voltage Regulator | High-accuracy integrated regulator |
| Communication Interfaces | SPI, I2C, UART |
| Timer Functions | Multiple flexible Timer Modules (timing, pulse generation, PWM) |
| Boîtier | 48-LQFP-EP |
| Type de montage | Surface Mount |
Guide de configuration des broches du HT45F8650 48-lqfp-ep
Configuration des broches du HT45F8650 (boîtier 48-lqfp-ep). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour HT45F8650.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
HT45F8650 convient pour 6 applications: Electric Power Tool Battery Packs, Handheld Vacuum Cleaners, Handheld Hair Dryers, Handheld Measurement Instruments, Rechargeable Battery Pack Protection (Generic 3-8S Packs), Portable IoT and Connected Devices.
Electric Power Tool Battery Packs
The HT45F8650 fits cordless drill, impact driver, and saw packs of 3 to 8 Li-ion cells, where its 36V maximum input covers the highest pack voltage in this class. The two integrated discharge N-type MOSFET gate drivers control the high-current discharge path directly, eliminating an external gate-driver IC, while the charge driver manages the charging FET. The 12-bit ADC sampling the accumulative cell voltage monitor at ±0.5% divided ratio accuracy supplies the cell-voltage data that firmware compares against overcharge and over-discharge thresholds, with the comparator providing fast hardware-level protection. Timer Module PWM outputs can drive fuel-gauge LEDs or gas gauges over UART to the tool trigger electronics.
Recommandé
Handheld Vacuum Cleaners
Cordless vacuum packs in the 3-8 cell range benefit from the HT45F8650's single-chip integration of cell monitoring, protection logic, and motor-control PWM. The 12-bit ADC with ±0.5% divided ratio accuracy resolves per-stack voltage closely enough to enforce safe cutoff thresholds as the pack sags under motor load, and the integrated high-accuracy voltage regulator powers the MCU core directly from the pack. The flexible Timer Modules generate PWM for motor speed control, while SPI or UART links the MCU to user-interface electronics. Because protection and control share one Flash MCU, firmware can implement adaptive cutoff curves that extend runtime without violating cell safety limits.
Recommandé
Handheld Hair Dryers
Battery-powered hair dryers draw large, bursty currents from 3-8 cell packs, demanding accurate under-voltage detection and robust discharge FET control - both natively handled by the HT45F8650. The discharge N-type MOSFET gate drivers switch the load path directly, the comparator gives immediate over-current/under-voltage response independent of ADC loop latency, and the 12-bit cell voltage data allows firmware to derate heater power as the pack depletes, preventing nuisance shutdowns. The True EEPROM stores per-pack calibration and serial data for traceability. Holtek explicitly names handheld hair dryers as a target application for the HT45F86xx family.
Recommandé
Handheld Measurement Instruments
Portable multimeters, thermal instruments, and environmental meters rely on the HT45F8650 both as system controller and battery manager. Its multi-channel 12-bit ADC can be shared between measurement channels and the battery voltage monitor, with the accumulative divider's ±0.5% accuracy keeping gauge readings trustworthy. The high-accuracy voltage regulator provides a stable analog rail for the front end from the Li-ion pack, and the SPI/I2C/UART interfaces connect displays, sensors, and calibration EEPROMs. True EEPROM retains calibration constants through reprogramming, so instruments can be recalibrated in service without replacing the MCU.
Recommandé
Rechargeable Battery Pack Protection (Generic 3-8S Packs)
As a dedicated BMS controller, the HT45F8650 implements the full protection state machine for 3S to 8S Li-ion packs: continuous cell-voltage acquisition via the accumulative monitor and 12-bit ADC, hardware over-voltage/under-voltage comparison, charge and discharge FET control through the three integrated N-type gate drivers, and over-current protection with selectable OCP supply (I/O pin or VDD/5V) per Holtek's BMS development platform documentation. Firmware in the 8KB Flash implements balancing strategy via Timer Module PWM outputs, while UART/I2C reports pack status to chargers or host systems. One 48LQFP-EP device replaces a discrete AFE plus controller, cutting BOM count and board area.
Recommandé
Portable IoT and Connected Devices
Battery-operated IoT nodes that need in-pack intelligence use the HT45F8650's UART or I2C to report state-of-charge, cell health, and protection events to a wireless module or gateway MCU. The 12-bit ADC, ±0.5% monitor accuracy, and True EEPROM calibration data give the host credible telemetry, while the integrated regulator and low-power Flash core suit always-on supervision at modest power budgets. Timer Modules handle wake-up timing and PWM signaling, so the BMS MCU can duty-cycle higher-power subsystems. For products in the 3-8 cell range, one chip provides both safety protection and the data link - reducing firmware split across two processors.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour HT45F8650 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | HT45F8550 | HT45F8660 |
|---|---|---|---|
| Package | 48-LQFP-EP | 48-LQFP-EP - same | 48-LQFP-EP - same |
| Brand | Holtek Semiconductor | Holtek Semiconductor | Holtek Semiconductor |
| ADC Resolution | 12-bit | 12-bit (family common) | 12-bit (family common) |
| Cell Monitor Accuracy | ±0.5% divided ratio | ±0.5% (family common) | ±0.5% (family common) |
| MOSFET Gate Drivers | 2 discharge + 1 charge (N-type) | 2 discharge + 1 charge (N-type) | 2 discharge + 1 charge (N-type) |
| Communication Interfaces | SPI, I2C, UART | SPI, I2C, UART | SPI, I2C, UART |
Principaux différenciateurs
- Fully integrated BMS analog front end (vs HT45F8550)
- Larger memory for feature-rich BMS firmware (vs HT45F8550)
- Three integrated N-type MOSFET gate drivers (vs Discrete AFE + MCU solutions)
Notes de conception
Per Holtek's HT45F86xx BMS development platform documentation, the OCP (over-current protection) circuit power source is selectable between a general I/O pin and VDD (5V) via resistor options (R4: 0 ohm, R3: NC for the VDD option). Choose this during schematic design, not after layout - it changes the current path of the protection circuit. Additionally, pins PA0 and PA3 support two coexisting functions that must not be used simultaneously; resolve the multiplexing conflict in firmware and pin assignment early to avoid respins.
Keep the accumulative cell voltage monitor sense traces away from the high-current discharge path to prevent IR-drop and switching noise from corrupting the ±0.5% divided ratio accuracy. Star-ground the analog front end (divider network, ADC reference) at the exposed pad of the 48LQFP-EP, and place the high-accuracy voltage regulator decoupling capacitors close to the pins. Route the MOSFET gate driver outputs with short traces to the charge/discharge N-type FET gates and include gate resistors to control switching slew without compromising protection response time.
The 36V maximum input rating is an absolute ceiling: an 8S pack can reach 33.6V at full charge, leaving only ~2.4V margin, so verify transient behavior during charger faults or hot-swap events. Estimated: at 8S full charge (33.6V) with the internal regulator dropping to a 5V rail, on-chip dissipation scales with regulator load current - keep regulator-supplied loads modest and use the selectable OCP supply option to shift load current off the internal regulator when operating near maximum pack voltage. Consult the manufacturer datasheet regulator specifications for exact limits.
Informations de conformité
Compliance data was not included in the verified web data retrieved for this record. Consult the official Holtek product page or distributor compliance certificates.
