ATMEGA406-1AAU Atmel, ATMEGA406-1AAU Datasheet - Page 30

• Manufacturer Part Number: ATMEGA406-1AAU
• Description: IC AVR MCU 40K 1MHZ 48LQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA406-1AAU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 1MHz
• Connectivity: I²C
• Peripherals: POR, WDT
• Number Of I /o: 18
• Program Memory Size: 40KB (20K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 25 V
• Data Converters: A/D 10x12b
• Oscillator Type: Internal
• Operating Temperature: -30°C ~ 85°C
• Package / Case: 48-LQFP
• Processor Series: ATMEGA48x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: 2-Wire
• Maximum Clock Frequency: 1 MHz
• Number Of Programmable I/os: 18
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 30 C
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 1MHz
• Total Internal Ram Size: 2KB
• # I/os (max): 18
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 5/9/12/15/18/24V
• Operating Supply Voltage (max): 25V
• Operating Supply Voltage (min): 4V
• On-chip Adc: 10-chx12-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -30C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Controller Family/series: AVR MEGA
• No. Of I/o's: 18
• Eeprom Memory Size: 512Byte
• Ram Memory Size: 2KB
• Cpu Speed: 1MHz
• Rohs Compliant: Yes
• For Use With: 770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

30
ATmega406
• Bit 0 - ACS: Asynchronous Clock Select
The ACS bit is used to selected the source of the asynchronous clock for the Coulomb Counter
ADC and Wake-up Timer. The Slow RC Oscillator is selected when this bit is cleared (zero). The
32 kHz Crystal Oscillator is selected when this bit is set (one).
The selected clock source and oscillator enable conditions are illustrated in
Table 7-4.
Recommended algorithm for switching from the RC Oscillator to the Crystal Oscillator as the
asynchronous clock for the Coulomb Counter ADC and Wake-up Timer:
1. Enable the Crystal Oscillator by setting the XOE bit (one).
2. Enable the Wake-up Timer, select a two second timeout, and reset the Wake-up Timer
3. Wait for the Wake-up Timer time-out.
4. Switch to the Crystal Oscillator by setting the ACS bit (one) while keeping the XOE bit set
5. Optional: Wait for another Wake-up Timer time-out, to ensure the Crystal Oscillator is
Recommended algorithm for switching from the Crystal Oscillator to the RC Oscillator as the
asynchronous clock for the Coulomb Counter ADC and Wake-up Timer:
1. Switch to the RC Oscillator by clearing the ACS bit (zero) while keeping the XOE bit set
2. Disable the Crystal Oscillator by clearing the XOE bit (zero) while keeping the ACS bit
Sleep Mode
Power-off or Power-down
Other Sleep Modes
Active Mode
(”Wake-up Timer” on page 49
(one).
operating correctly. This can be done by enabling another timer interrupt with significantly
longer time-out, and checking that the Wake-up Timer time-out occurs first.
(one).
cleared (zero).
Asynchronous Clock Source and Oscillator Enable Conditions
32 kHz Crystal
Oscillator Enable
0
XOE
XOE
for details).
Slow RC
Oscillator Enable
0
ACS & (CADEN | WUTEN)
1
Table
7-4.
2548E–AVR–07/06