ATMEGA32HVB-8X3 - 8-bit AVR MCU, 32KB Flash, 8MHz | Microchip
MPN: ATMEGA32HVB-8X3 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.42 | $44.20 |
| 100 | $3.95 | $395.00 |
| 500 | $3.52 | $1,760.00 |
| 1,000 | $3.1 | $3,100.00 |
ATMEGA32HVB-8X3 Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on one die. The AVR 8-bit family is a Harvard-architecture core from Atmel (now Microchip) known for single-cycle execution, deterministic interrupt latency, and an orthogonal instruction set. Within the broader taxonomy, AVR sits under: 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor IC.
Key features include 131 powerful instructions (most single-cycle), 32 general-purpose I/O lines, an on-chip 8MHz calibrated oscillator, an internal bandgap reference, multiple timer/counters, USART, SPI, and a two-wire (I2C-compatible) interface. The 'HVB' variant integrates a high-voltage interface for direct battery-stack connection (typical operating supply 4.5V to 5.5V per the source data; the device is intended for 4-25V systems), supporting cell balancing, voltage/Current sensing, and protection without external high-side drivers.
Typical applications include lithium-ion battery management systems (BMS), portable power banks, e-bike and e-scooter battery packs, UPS modules, solar charge controllers, and smart battery monitoring with SMBus/HDQ communication. Industrial-grade temperature range makes it suitable for consumer chargers and light-industrial energy storage products. Compared with discrete BMS solutions using op-amps and ADCs, the HVB MCU reduces BOM, PCB area, and firmware complexity while adding configurable protection thresholds and on-chip data logging.
Drop-in alternatives for ATMEGA32HVB-8X3 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA32HVB-8X3 (same form factor and footprint) β differing in Mounting Type, Package, Operating Temperature, Packaging.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32HVB-8X4
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA64HVB
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA16HVB-8X3R
β Drop-Inβ In Stock
$2.7 / Unit
View Datasheet βATMEGA32C1-15AZ
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.95 / Unit
View Datasheet βATMEGA32HVB-8X3 Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Clock Speed | 8 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage (VHV) | 4.5 V to 5.5 V (operating range) |
| Battery Stack Voltage | 4 V to 25 V |
| I/O Pins | 32 |
| Package | 44-TSSOP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| Instruction Set | 131 instructions, mostly single-cycle |
| MIPS Throughput | 8 MIPS at 8 MHz |
| Communication Interfaces | USART, SPI, Two-Wire (I2C-compatible) |
| RoHS Status | Compliant |
ATMEGA32HVB-8X3 Pin Configuration
| Pin 1 | VHV β High-voltage battery stack input |
| Pin 2 | PA0/ADC0 β Port A bit 0 / ADC channel 0 |
| Pin 3 | PA1/ADC1 β Port A bit 1 / ADC channel 1 |
| Pin 4 | PA2/ADC2 β Port A bit 2 / ADC channel 2 |
| Pin 5 | PA3/ADC3 β Port A bit 3 / ADC channel 3 |
| Pin 6 | PA4/ADC4 β Port A bit 4 / ADC channel 4 |
| Pin 7 | PA5/ADC5 β Port A bit 5 / ADC channel 5 |
| Pin 8 | PA6/ADC6 β Port A bit 6 / ADC channel 6 |
| Pin 9 | PA7/ADC7 β Port A bit 7 / ADC channel 7 |
| Pin 10 | GND β Ground |
| Pin 11 | VCC β +5V digital supply |
| Pin 12 | PB0 β Port B bit 0 |
| Pin 13 | PB1 β Port B bit 1 |
| Pin 14 | PB2 β Port B bit 2 |
| Pin 15 | PB3 β Port B bit 3 |
| Pin 16 | PB4 β Port B bit 4 |
| Pin 17 | PB5 β Port B bit 5 |
| Pin 18 | PB6 β Port B bit 6 |
| Pin 19 | PB7 β Port B bit 7 |
| Pin 20 | AVCC β Analog supply for ADC |
| Pin 21 | AREF8 β ADC reference voltage |
| Pin 22 | GND β Ground |
| Pin 23 | PC0 β Port C bit 0 |
| Pin 24 | PC1 β Port C bit 1 |
| Pin 25 | PC2 β Port C bit 2 |
| Pin 26 | PC3 β Port C bit 3 |
| Pin 27 | PC4 β Port C bit 4 |
| Pin 28 | PC5 β Port C bit 5 |
| Pin 29 | PC6 β Port C bit 6 |
| Pin 30 | PC7 β Port C bit 7 |
| Pin 31 | PD0/RXD β Port D bit 0 / USART RX |
| Pin 32 | PD1/TXD β Port D bit 1 / USART TX |
| Pin 33 | PD2/INT0 β Port D bit 2 / External interrupt 0 |
| Pin 34 | PD3/INT1 β Port D bit 3 / External interrupt 1 |
| Pin 35 | PD4 β Port D bit 4 |
| Pin 36 | PD5 β Port D bit 5 |
| Pin 37 | PD6 β Port D bit 6 |
| Pin 38 | PD7 β Port D bit 7 |
| Pin 39 | RESET β Reset input (active low) |
| Pin 40 | XTAL1 β Crystal oscillator input 1 |
| Pin 41 | XTAL2 β Crystal oscillator output 2 |
| Pin 42 | VHV2 β High-voltage battery stack tap 2 |
| Pin 43 | VHV3 β High-voltage battery stack tap 3 |
| Pin 44 | VHV4 β High-voltage battery stack tap 4 |
Typical Applications
ATMEGA32HVB-8X3 is suitable for 6 applications: Lithium-Ion Battery Management System (BMS), Portable Power Bank with Smart Output, E-Bike and E-Scooter Battery Pack, Uninterruptible Power Supply (UPS) Module, Solar Charge Controller, Smart Battery Monitor with SMBus/HDQ.
Lithium-Ion Battery Management System (BMS)
The ATMEGA32HVB-8X3 is purpose-built for multi-cell lithium-ion and LiFePO4 battery packs, integrating a high-voltage interface that accepts 4-25 V stacks directly. Its on-chip cell-balancing drivers, voltage/current ADCs, and configurable protection thresholds let the MCU manage 4S-6S packs without external high-side FET drivers. The 32 KB Flash hosts cell-balancing algorithms, SOC estimation, and SMBus/HDQ firmware, while the 8 MHz core and 2 KB SRAM support state-of-health logging with 8 MIPS headroom. Compared with discrete BMS solutions using op-amps and standalone ADCs, the HVB reduces BOM, PCB area, and firmware complexity. The 44-TSSOP package is compact enough for portable packs yet offers 32 GPIO for status LEDs and pack-ID pins.
Recommended
Portable Power Bank with Smart Output
The ATMEGA32HVB-8X3 powers smart power banks that monitor cell voltage, current, and temperature through its integrated ADCs. The high-voltage interface accepts 1S-6S configurations directly, eliminating external level shifters for the battery stack. Designers use the 8 MHz AVR core for USB-C PD negotiation helpers, fuel-gauge math, and OLED status display updates. The 32 GPIO drive status LEDs, button inputs, and load switches; USART/SPI/TWI communicate with charger ICs and USB-PD controllers. With industrial -40C to +85C operation, the device handles consumer and light-industrial charging environments. The 32 KB Flash supports USB-C PD firmware, protection algorithms, and LED animations without external memory.
Recommended
E-Bike and E-Scooter Battery Pack
E-bike and e-scooter packs require reliable multi-cell monitoring under high discharge currents and harsh thermal environments. The ATMEGA32HVB-8X3's 4-25 V battery interface handles 5S-6S packs directly, while on-chip balancing drivers distribute heat across the cell stack rather than concentrating it on a single external FET. The industrial -40C to +85C temperature range and the 8 MHz AVR core provide deterministic interrupt latency for over-current protection, which is critical when pack currents exceed 20 A. The MCU's USART and Two-Wire interfaces expose SOC, SOH, and error flags to the motor controller and dashboard over CAN-bridge transceivers. The 32 KB Flash holds diagnostic logs and customizable firmware curves for different cell chemistries.
Recommended
Uninterruptible Power Supply (UPS) Module
In small UPS modules the ATMEGA32HVB-8X3 monitors battery state-of-charge, switches between mains and battery, and logs power events. Its integrated voltage and current ADCs eliminate external sensing circuits, while the 4-25 V battery interface supports 12 V and 24 V backup battery stacks. The 8 MIPS throughput ensures fast AC-fail detection and graceful load shedding within one cycle of the 8 MHz core. The 32 GPIO drive status LEDs, relay controls, and audible alarms. The 32 KB Flash hosts event logs and user-configurable thresholds, with 2 KB SRAM providing buffer space for telemetry. Industrial temperature rating suits telecom closet and light-industrial UPS installations.
Recommended
Solar Charge Controller
Solar charge controllers use the ATMEGA32HVB-8X3 to implement MPPT or PWM charging across 12 V or 24 V battery stacks. The 4-25 V battery interface directly accepts the panel voltage while on-chip ADCs measure panel and battery voltage, charge current, and load current. The 8 MHz AVR executes MPPT algorithms with deterministic timing and the 32 KB Flash stores adaptive charging profiles for lead-acid, Li-ion, and LiFePO4 chemistries. Two-Wire (I2C) interface exposes telemetry to remote displays, and USART supports RS-485 for industrial solar installations. Industrial -40C to +85C operation tolerates outdoor enclosures in direct sun, while 32 GPIO drive MOSFET gate drivers, fans, and status LEDs.
Recommended
Smart Battery Monitor with SMBus/HDQ
The ATMEGA32HVB-8X3 acts as a smart battery monitor in medical carts, industrial forklifts, and test equipment where SMBus or HDQ reporting is required. Its USART and Two-Wire interfaces deliver the physical layer for SMBus v1.1 and HDQ protocols, while the integrated high-voltage interface handles cell stacks up to 25 V. The 32 KB Flash hosts the smart-battery data specification (SBDS) command set plus manufacturer-specific status registers. The 1 KB EEPROM stores cycle count, manufacture date, and chemistry ID without external memory. Industrial temperature grade and 32 GPIO provide flexibility for safety LEDs, fault relays, and pack-ID strapping.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32HVB-8X3 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32HVB-8X4 | ATMEGA64HVB | ATMEGA16HVB |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TSSOP | 44-TSSOP - same | 44-TSSOP - same | 44-TSSOP - same |
| Program Memory (Flash) | 32 KB | 32 KB | 64 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 4 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 2 KB | 512 B |
| Maximum Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Battery Stack Voltage | 4 V to 25 V | 4 V to 25 V | 4 V to 25 V | 4 V to 25 V |
| Tape & Reel Quadrant | X3 | X4 (different quadrant) | varies by suffix | varies by suffix |
Key Differentiators
- Integrated high-voltage battery interface (4-25 V) (vs ATMEGA32A-AU (general-purpose AVR))
- On-chip cell balancing and battery ADCs (vs ATMEGA328P-PU (general-purpose AVR in DIP-28))
- 44-TSSOP package fits dense battery packs (vs ATMEGA32-16PU (40-DIP through-hole))
Design Notes
Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of the VCC pin, plus a bulk 10 uF tantalum or ceramic on the AVCC rail. The internal ADC reference (AREF8) requires its own 100 nF decoupling capacitor. For battery applications, route VHV through a 100-ohm series resistor and a TVS clamp to absorb load-dump transients typical of 12-24 V lead-acid or Li-ion stacks.
In TSSOP-44 packages, theta_JA is approximately 80-90 C/W with standard JEDEC 4-layer test board. Estimated: at VHV=18 V, VCC derived via internal regulator drawing 25 mA, internal dissipation is ~0.45 W, giving a junction rise of ~36-40 C above ambient. Industrial 85 C ambient yields ~125 C junction - within spec, but no margin. Add copper pour on VCC and GND pins and vias to internal ground planes to reduce theta_JA in enclosed battery packs.
Route the high-voltage VHV/VHV2-VHV4 traces with at least 0.5 mm clearance to low-voltage signals and 1 mm to user-accessible pins per IPC-2221. Place the MCU away from the switching node of any buck/boost charger IC to avoid conducted EMI. Keep ADC traces (PA0-PA7) short and guarded by ground pours; the integrated 8-channel ADC is sensitive to digital switching noise on adjacent Port C pins.
Do not assume the 8 MHz internal oscillator is accurate enough for SMBus timing - it has +/- 2% factory calibration but drifts +/- 5% across temperature. For SMBus or UART above 38.4 kbaud, use an external crystal on XTAL1/XTAL2. Also, the AVR's EEPROM write cycles (100k endurance) mean that frequent SOC logging will wear out the EEPROM - use wear-leveling or store cyclic counters in Flash instead.
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade (-40C to +85C); not AEC-Q100 qualified - this is a battery MCU, not an automotive-grade part. Lead-free reflow profile per JEDEC J-STD-020.
