ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 3

• Manufacturer Part Number: ATmega406
• Manufacturer: Atmel Corporation

Specifications of ATmega406

• Flash (kbytes): 40 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 1 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -30 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 2
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

2. Overview
2.1
Figure 2-1.
2548ES–AVR–07/06
Block Diagram
VFET
VREG
RESET
BATT
XTAL1
XTAL2
Block Diagram
VCC
GND
Supervision
Generation
Watchdog
Watchdog
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.
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, short-circuit during discharging and over-current during charg-
ing and discharging.
Oscillator
Oscillator
Regulator
Circuits /
RESET
POR &
Charger
Voltage
Power
Detect
Timer
Clock
SCL
Wake-Up
Flash
Timer
TWI
PORTD (2)
PD1..0
SCA
CPU
DATA BUS
SRAM
JTAG
PORTC (1)
PC0
PORTB (8)
PB7..0
16 bit T/C1
EEPROM
8 bit T/C0
PORTA (8)
PA7..0
Counter ADC
Protection
Reference
Balancing
Coulumb
Control
Battery
Voltage
Voltage
ADC
FET
Cell
PA3..0
ATmega406
PPI
NNI
PVT
PV4
PV3
PV2
PV1
SGND
NV
VREF
VREFGND
PI
NI
OPC
OC
OD
3