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ATMEGA406 Datasheet(PDF) 3 Page - ATMEL Corporation |
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ATMEGA406 Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 263 page  3 2548E–AVR–07/06 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 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. PORTA (8) TWI SRAM Flash CPU EEPROM PV2 NV OPC OC OD FET Control Battery Protection Voltage ADC Voltage Reference Coulumb Counter ADC GND VCC RESET Power Supervision POR & RESET Watchdog Oscillator Watchdog Timer Oscillator Circuits / Clock Generation PPI NNI PVT SGND VREF VREFGND PI NI PA7..0 PA3..0 16 bit T/C1 8 bit T/C0 PORTB (8) PB7..0 JTAG Wake-Up Timer Voltage Regulator Charger Detect VFET VREG BATT PV1 DATA BUS PORTC (1) PC0 SCA SCL Cell Balancing PV3 PV4 PORTD (2) PD1..0 XTAL1 XTAL2 |
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