The ATmega4HVD/8HVD is a high‑performance, low‑power 8‑bit AVR microcontroller designed for 1‑cell Li‑ion battery monitoring and protection. It integrates flash, EEPROM, SRAM, high‑voltage I/O, a 10‑bit ADC, watchdog timer, and on‑chip voltage regulator, providing secure authentication and autonomous battery protection.
The handbook covers pin‑out diagrams, detailed pin descriptions, block diagrams, CPU core architecture, programming methods (including debugWIRE and high‑voltage serial programming), electrical specifications, package information, and ordering details. It also includes example code snippets and guidance for using the device in battery‑managed applications.
| Flash Memory | 4 KB or 8 KB |
|---|---|
| EEPROM | 256 Bytes |
| SRAM | 512 Bytes |
| Operating Voltage (VFET) | 2.1 V – 6.0 V |
| Operating Voltage (Voc) | 2.0 V – 2.4 V |
| Maximum Withstand Voltage (VFET) | 12 V |
| Maximum Withstand Voltage (High‑voltage pins) | 5 V |
| Temperature Range | -20 °C to 85 °C |
| Speed Grade | 1 MHz – 4 MHz |
| Package | 18‑pad DRDFN/MLF |
The VFET pin operates from 2.1 V up to 6.0 V.
It provides either 4 KB or 8 KB of in‑system self‑programmable flash memory.
Port C pins are high‑voltage open‑drain 2‑bit bi‑directional I/O pins.
The device supports Idle, ADC Noise Reduction, Power‑save, and Power‑off sleep modes.