ATMEGA406-1AAU Atmel, ATMEGA406-1AAU Datasheet - Page 26

• 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

7.1.5
7.1.6
7.1.7
7.2
7.3
26
Clock Sources
Calibrated Fast RC Oscillator
ATmega406
Voltage ADC Clock – clk
Coulomb Counter ADC Clock - clk
Watchdog Timer and Battery Protection Clock
The Voltage ADC is provided with a dedicated clock domain. This allows halting the CPU and
I/O clocks in order to reduce noise generated by digital circuitry. This gives more accurate ADC
conversion results.
The Coulomb Counter ADC is provided with a dedicated clock domain. This allows operating the
Coulomb Counter ADC in low power modes like Power-save for continuous current
measurements.
The Watchdog Timer and Battery Protection are provided with a dedicated clock domain. This
allows operation in all modes except Power-off. It also allows very low power operation by utiliz-
ing an Ultra Low Power RC Oscillator dedicated to this purpose.
The device has the following clock sources. The clocks are input to the AVR clock generator,
and routed to the appropriate modules.
The calibrated Fast RC Oscillator by default provides a 4.0 MHz clock, which is divided down to
1.0 MHz to all modules except the TWI. The frequency is nominal value at 25°C. This clock will
operate with no external components. During reset, hardware loads the calibration byte into the
FOSCCAL Register and thereby automatically calibrates the Fast RC Oscillator. At 25°C, this
calibration gives a frequency of 4 MHz ± 3%. The oscillator can be calibrated to any frequency in
the range 3.7 - 4.0 MHz within ±1% accuracy, by changing the FOSCCAL register. For more
information on the pre-programmed calibration value, see the section
page
The start-up times for the Fast RC Oscillator are determined by the SUT Fuses as shown in
Table 7-1 on page
Table 7-1.
Note:
198.
SUT1:0
1. The device is shipped with this option selected.
VADC
00
01
10
11
Start-up times for the internal calibrated RC Oscillator clock selection
26.
CCADC
Start-up Time from Power-down
and Power-save
6 CK
6 CK
6 CK
Reserved
Additional Delay from Reset
14CK + 65 ms
14CK + 4.1 ms
”Calibration Bytes” on
14CK
2548E–AVR–07/06
(1)