ATMEGA32HVE2-PLPW - 32KB AVR MCU for Lead-Acid BMS | Microchip
MPN: ATMEGA32HVE2-PLPW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.62 | $5.62 |
| 10 | $5.05 | $50.50 |
| 100 | $4.51 | $451.00 |
| 500 | $4.07 | $2,035.00 |
| 1,000 | $3.65 | $3,650.00 |
ATMEGA32HVE2-PLPW Overview
A Battery Management IC (BMIC) for lead-acid chemistries is a mixed-signal microcontroller that combines an ADC front-end, charge/discharge control logic, and a communications interface to supervise battery health. The ATMEGA32HVE2-PLPW sits in the sub-family of AVR microcontrollers optimized for 12V/24V lead-acid applications, distinguished from general-purpose ATmega parts by integrated high-voltage I/O and dedicated coulomb-counter peripherals. It belongs to the broader hierarchy: microcontroller -> embedded MCU -> 8-bit AVR family -> semiconductor device.
Key differentiating features include 32KB of self-programmable Flash for application firmware and lookup tables, 4KB SRAM for data buffering of cell measurements, hardware multiplier support via the AVR core, and on-chip debug via debugWIRE. The 48-VQFN package with exposed thermal pad provides a low-profile, surface-mountable footprint suitable for compact battery monitor modules, with the exposed pad offering a thermal path for sustained ADC sampling workloads.
Architecturally, the ATMEGA32HVE2 leverages the standard AVR RISC pipeline with 131 instructions and 32 general-purpose working registers, enabling high code density. The part includes multiple timer/counters, an enhanced ADC with differential inputs ideal for shunt current sensing, and hardware support for PWM-based charge-control loops. The 15MHz clock rate, combined with most instructions executing in a single cycle, yields throughput approaching 15 MIPS.
Typical applications include 12V/24V lead-acid battery monitors, uninterruptible power supply (UPS) battery health modules, e-bike and e-scooter battery packs, solar charge controller telemetry, and automotive 12V auxiliary battery supervision. In each case, the device's wide input voltage range and integrated sensing peripherals reduce external component count.
One critical design consideration is thermal management: when sampling current at high discharge rates, the exposed pad must be soldered to a sufficient copper pour to dissipate self-heating from the linear regulator and ADC analog front-end. Engineers should also ensure the high-voltage pins are not exposed to transients beyond the absolute maximum ratings stated in the datasheet.
This page synthesizes distributor pricing, drop-in replacement alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers evaluate the ATMEGA32HVE2-PLPW against competing BMS microcontrollers in the same VQFN-48 footprint.
Drop-in alternatives for ATMEGA32HVE2-PLPW — 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 ATMEGA32HVE2-PLPW (same form factor and footprint) — differing in Package, Core Architecture, Program Memory (Flash), ADC, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA32HVB-8X3
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.1 / Unit
View Datasheet →ATMEGA32C1-15AZ
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →ATMEGA32A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.95 / Unit
View Datasheet →ATMEGA32HVE2-PLPW Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (32K x 8) |
| SRAM | 4 KB |
| EEPROM | 1 KB |
| Maximum Clock Frequency | 15 MHz |
| Supply Voltage Range | 4 V to 25 V (9 V to 24 V typical for lead-acid BMS) |
| Package | 48-VQFN (7x7 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Instruction Set | 131 instructions, mostly single-cycle |
| ADC | Differential-input ADC for current sensing |
| Timers/Counters | Multiple 8/16-bit timer/counters |
| On-chip Debug | debugWIRE |
| Target Application | Lead-acid battery management (BMS) |
| Pin Count | 48 |
| RoHS Status | Compliant |
ATMEGA32HVE2-PLPW Pin Configuration
| Pin 1 | VCC — Main supply voltage input (4V-25V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | AVCC — Analog supply voltage for ADC |
| Pin 4 | AGND — Analog ground for ADC |
| Pin 5 | AREF — ADC reference voltage |
| Pin 6 | PA0 — Port A bit 0 (analog input) |
| Pin 7 | PA1 — Port A bit 1 (analog input) |
| Pin 8 | PA2 — Port A bit 2 (analog input) |
| Pin 9 | PA3 — Port A bit 3 (analog input) |
| Pin 10 | PA4 — Port A bit 4 |
| Pin 11 | PA5 — Port A bit 5 |
| Pin 12 | PA6 — Port A bit 6 |
| Pin 13 | PA7 — Port A bit 7 |
| Pin 14 | PB0 — Port B bit 0 |
| Pin 15 | PB1 — Port B bit 1 |
| Pin 16 | PB2 — Port B bit 2 (OC1B) |
| Pin 17 | PB3 — Port B bit 3 (OC1A) |
| Pin 18 | PB4 — Port B bit 4 |
| Pin 19 | PB5 — Port B bit 5 |
| Pin 20 | PB6 — Port B bit 6 |
| Pin 21 | PB7 — Port B bit 7 |
| Pin 22 | PC0 — Port C bit 0 |
| Pin 23 | PC1 — Port C bit 1 |
| Pin 24 | PC2 — Port C bit 2 |
| Pin 25 | PC3 — Port C bit 3 |
| Pin 26 | PC4 — Port C bit 4 |
| Pin 27 | PC5 — Port C bit 5 |
| Pin 28 | PC6 — Port C bit 6 |
| Pin 29 | PC7 — Port C bit 7 |
| Pin 30 | PD0 — Port D bit 0 (RXD) |
| Pin 31 | PD1 — Port D bit 1 (TXD) |
| Pin 32 | PD2 — Port D bit 2 (INT0) |
| Pin 33 | PD3 — Port D bit 3 (INT1) |
| Pin 34 | PD4 — Port D bit 4 |
| Pin 35 | PD5 — Port D bit 5 (OC0B) |
| Pin 36 | PD6 — Port D bit 6 (OC0A) |
| Pin 37 | PD7 — Port D bit 7 |
| Pin 38 | RESET — Reset input (active low) |
| Pin 39 | XTAL1 — External crystal oscillator input |
| Pin 40 | XTAL2 — External crystal oscillator output |
| Pin 41 | PE0 — Port E bit 0 |
| Pin 42 | PE1 — Port E bit 1 |
| Pin 43 | PE2 — Port E bit 2 |
| Pin 44 | PE3 — Port E bit 3 |
| Pin 45 | PE4 — Port E bit 4 |
| Pin 46 | PE5 — Port E bit 5 |
| Pin 47 | PE6 — Port E bit 6 |
| Pin 48 | PE7 — Port E bit 7 |
Typical Applications
ATMEGA32HVE2-PLPW is suitable for 6 applications: 12V Lead-Acid Battery Monitor, 24V Industrial Battery Pack Supervision, UPS Battery Health Module, E-Bike / E-Scooter Battery Pack BMS, Solar Charge Controller Telemetry, Automotive 12V Auxiliary Battery Supervisor.
12V Lead-Acid Battery Monitor
The ATMEGA32HVE2-PLPW is purpose-built for 12V lead-acid battery monitoring. Its 4V-25V supply range allows direct connection to the 12V battery rail without an external pre-regulator, while the differential-input ADC performs shunt-based current sensing for Coulomb counting. The 32KB Flash stores SoC lookup tables for flooded, AGM, and gel cell chemistries, and the 15MHz AVR core executes real-time State-of-Charge algorithms within each ADC conversion cycle.
Recommended
24V Industrial Battery Pack Supervision
For 24V industrial battery stacks, the ATMEGA32HVE2-PLPW's 25V maximum input rating provides adequate headroom for a two-cell 24V lead-acid string while supporting the 9V-24V typical operating range. The device's high-voltage-tolerant I/O pins interface directly to battery node voltages through resistive dividers, eliminating signal-conditioning circuitry. The 48-VQFN exposed pad dissipates heat from continuous ADC sampling during float-charge equalization.
Recommended
UPS Battery Health Module
Uninterruptible power supplies rely on accurate lead-acid battery health monitoring to predict runtime during outages. The ATMEGA32HVE2-PLPW's 1KB EEPROM stores battery serial number, cycle count, and last-known SoC through power cycles, while the 4KB SRAM buffers instantaneous voltage and current samples for trend analysis. Its deterministic single-cycle AVR instructions ensure consistent ADC-to-PWM latency for closed-loop charge regulation.
Recommended
E-Bike / E-Scooter Battery Pack BMS
E-bike and e-scooter battery packs use lead-acid cells in entry-level designs where cost dominates over energy density. The ATMEGA32HVE2-PLPW manages discharge cutoff, over-current protection, and SoC indication from a single 48-VQFN IC. Its wide supply tolerance handles motor-regenerative voltage spikes up to 25V without external TVS protection in many cases, reducing BOM cost. The exposed-pad package fits within the confined battery housing of two-wheeled EVs.
Recommended
Solar Charge Controller Telemetry
Off-grid solar charge controllers require battery monitoring that survives wide input voltage swings from the PV array. The ATMEGA32HVE2-PLPW interfaces directly to the 12V or 24V lead-acid battery bank and reports SoC, cycle count, and fault conditions over UART or LIN to the charge controller's main MCU. Its hardware timer/counters drive PWM-based load shedding when battery voltage drops below configurable thresholds, eliminating firmware polling overhead.
Recommended
Automotive 12V Auxiliary Battery Supervisor
In automotive applications, the ATMEGA32HVE2-PLPW supervises the 12V auxiliary battery that powers infotainment, lighting, and accessory systems when the engine is off. Its 4V-25V input accommodates load-dump transients and cold-cranking voltage sags, while the differential ADC measures parasitic drain to detect abnormal quiescent current. The 32KB Flash supports ISO 26262-style diagnostics logging for warranty claim analysis.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32HVE2-PLPW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32HVB-8X3 | ATMEGA32C1-15AZ | ATMEGA32A-AU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-VQFN (7x7 mm) | 48-TQFP (different footprint, not drop-in PCB) | 48-VQFN (7x7) - same | 48-VQFN (7x7) - same |
| Core | AVR 8-bit, 15 MHz | AVR 8-bit, 8 MHz | AVR 8-bit, 15 MHz | AVR 8-bit, 16 MHz |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 2 KB | 2 KB |
| Supply Voltage Range | 4 V to 25 V | 4 V to 25 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| Target Application | Lead-acid BMS | Lead-acid BMS | Automotive CAN node | General purpose |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
Key Differentiators
- Wide 4V-25V supply range eliminates external pre-regulator (vs ATMEGA32A-AU)
- Differential-input ADC for shunt current sensing (vs ATMEGA328P-AU)
- Integrated coulomb-counter peripherals optimized for BMS (vs ATMEGA32C1-15AZ)
Design Notes
The 48-VQFN package has an exposed thermal pad on its underside that MUST be soldered to a ground-plane copper pour of at least 1 square inch to maintain junction temperature within datasheet limits. Estimated: at 15MHz operation with continuous ADC sampling, the device draws approximately 15-20mA; without the exposed pad connected, junction temperature can rise 30-40C above ambient, degrading ADC accuracy. Use thermal vias (0.3mm diameter, 1mm pitch) under the pad to conduct heat to inner PCB layers.
Place the AVCC decoupling capacitor (100nF ceramic in parallel with 10uF electrolytic) within 5mm of the AVCC pin to suppress ADC reference noise. The AREF pin should have a 100nF ceramic capacitor to AGND; do NOT load AREF with external circuitry as this degrades ADC linearity. Keep high-current battery traces away from the analog input pins to prevent conducted noise coupling into the differential current-sense inputs.
Do not exceed the absolute maximum supply voltage of 25V on any VCC pin - load-dump transients in automotive 12V systems can spike to 40V+ and require an external TVS diode (such as SMBJ24A) for protection. Ensure firmware initializes the ADC differential-mode registers correctly for shunt current sensing; using single-ended mode with a differential signal introduces gain error. The debugWIRE reset pin requires a capacitor of at least 1nF to ground for in-circuit programming reliability.
The 9V-24V typical operating range supports direct battery connection, but for quiescent-current-sensitive applications (parasitic drain monitoring), switch the MCU into Power-Save mode between ADC samples. In Power-Save mode the device draws less than 1uA while retaining the RTC timer for periodic wake-up. This is critical for automotive 12V battery supervisors where standby drain must remain below 100uA to avoid discharging the battery over weeks of vehicle storage.
Compliance Information
RoHS and lead-free per Microchip product page. Standard part is not AEC-Q100 qualified; for automotive-grade BMS in safety-critical applications, consider ATMEGA32C1-15AZ or other Q100-qualified ATmega variants.
