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ATMEGA406
(Rev.:2005)

8-bit Microcontroller with 40K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega406

2. Overview

The ATmega406 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC

architecture. By executing powerful instructions in a single clock cycle, the ATmega406

achieves throughputs approaching 1 MIPS at 1 MHz.

2.1 Block Diagram

Figure 2-1. Block Diagram

PD1..0

PB7..0

XTAL1

XTAL2

VCC

RESET

GND

BATT

VFET

VREG

Oscillator

Circuits /

Clock

Generation

Watchdog

Oscillator

Watchdog

Timer

Power

Supervision

POR &

RESET

Charger

Detect

Voltage

Regulator

PORTD (2)

PORTB (8)

Wake-Up

Timer

Flash

JTAG

SRAM

CPU

8 bit T/C0

16 bit T/C1

EEPROM

DATA BUS

TWI

PORTC (1)

PORTA (8)

FET

Control

Battery

Protection

Cell

Balancing

Voltage

ADC

Voltage

Reference

Coulumb

Counter ADC

PA3..0

OPC

OC

OD

PPI

NNI

PVT

PV4

PV3

PV2

PV1

NV

SGND

VREF

VREFGND

PI

NI

SCL

SCA

PC0

PA7..0

The ATmega406 provides the following features: a Voltage Regulator, dedicated Battery Protec-

tion Circuitry, integrated cell balancing FETs, high-voltage analog front-end, and an MCU with

two ADCs with On-chip voltage reference for battery fuel gauging.

The voltage regulator operates at a wide range of voltages, 4.0 - 25 volts. This voltage is regu-

lated to a constant supply voltage of nominally 3.3 volts for the integrated logic and analog

functions.

The battery protection monitors the battery voltage and charge/discharge current to detect illegal

conditions and protect the battery from these when required. The illegal conditions are deep

under-voltage during discharging and short-circuit during discharging, and over-current during

charging and discharging.

3

2548AS–AVR–01/05

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