ATMEGA406-1AAU Atmel, ATMEGA406-1AAU Datasheet - Page 28

• 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

7.8
7.9
7.10
28
Coulomb Counter ADC and Wake-up Timer Clock
Watchdog Timer and Battery Protection Clock
Run-Time Clock Source Select
ATmega406
shown in
is shown in
Table 7-2.
Table 7-3.
The Coulomb Counter ADC and Wake-up Timer clock operates asynchronously with the CPU
clock, to allow low power operation in sleep modes. The clock source is either the 32 kHz Crystal
Oscillator, or the Slow RC Oscillator (divided by 4). The selected clock is input to the AVR Clock
Control Unit, and is routed to the appropriate modules.
The clock source for the Coulomb Counter ADC and Wake-up Timer is selected by an I/O bit in
the Clock Control and Status Register, see
details.
The clock source for the Watchdog Timer and Battery Protection is the Ultra Low Power RC
Oscillator. The Oscillator is automatically enabled in all operational modes where either the
Watchdog Timer, the Battery Protection, or both, are enabled. It is also enabled during reset.
The clock source for the Coulomb Counter ADC and Wake-up Timer is run-time selectable as
either the 32 kHz Crystal Oscillator, or the Slow RC oscillator (divided by 4). The clock source is
selected by an I/O bit in the Clock Control and Status Register.
The 32 kHz Crystal Oscillator is the recommended clock source in order to achieve the highest
clock accuracy. The Slow RC Oscillator is provided as a clock source for low cost systems, or as
an alternate clock source in case of crystal clock failure. If the CPU detects that the crystal clock
is not operating correctly, it can switch to the Slow RC Oscillator as a less accurate, but still func-
tional, backup solution.
SUT1:0
00
01
10
11
Table
Table
Start-up Time from Power-down
Start-up Times for the Calibrated Fast RC Oscillator
Number of Ultra Low Power RC Oscillator Cycles
7-2. The number of Ultra Low Power RC Oscillator cycles used for each time-out
Typ Time-out
7-3.
62.5 ms
3.9 ms
and Power-save
6 CK
6 CK
6 CK
”Run-Time Clock Source Select” on page 28
Reserved
Additional Delay from Reset
Number of Cycles
14CK + 62.5 ms
14CK + 3.9 ms
14CK
8000
500
2548E–AVR–07/06
for