ATMEGA406-1AAU Atmel, ATMEGA406-1AAU Datasheet - Page 107

• 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

18.2
2548E–AVR–07/06
Operation
When enabled, the CC-ADC continuously measures the voltage over the external sense resistor
R
The Instantaneous Current conversion time is fixed to 3.9 ms (typical value) allowing the output
value to closely follow the input. After each Instantaneous Current conversion an interrupt is
generate if the interrupt is enabled. Data from conversion will be updated in the Instantaneous
Current registers - CADICL and CADICH simultaneously as the interrupt is given. To avoid los-
ing conversion data, both the low and high byte must be read within a 3,9 ms timing window after
the corresponding interrupt is given. When the low byte register is read, updating of the Instanta-
neous Current registers and interrupts will be stopped until the high byte is read.
shows an Instantaneous Current conversion diagram, where DATA4 will be lost because DATA3
reading is not completed within the limited period.
Figure 18-2. Instantaneous Current Conversion
The Accumulate Current output is a high-resolution, high accuracy output with programmable
conversion time selected by the CADAS bits in CADCSRA. The converted value is an accurate
measurement of the average current flow during one conversion period. The CC-ADC generates
an interrupt each time a new Accumulate Current conversion has finished if the interrupt is
enabled. Data from conversion will be updated in the Accumulation Current registers - CADAC0,
CADAC1, CADAC2 and CADAC3 simultaneously as the interrupt is given. To avoid losing con-
version data, all bytes must be read within the selected conversion period. When the lower byte
registers are read, updating of the Accumulation Current registers and interrupts will be stopped
until the highest byte is read.
sion example, where DATA4 will be lost because DATA3 reading is not completed within the
limited period.
Instantaneous Interrupt
SENSE
Instantaneous Data
Read high byte
Read low byte
.
Enable
Setting of Digital Filters
~12 ms settling
Figure 18-3 on page 108
3.9 ms
DATA1
shows an Accumulation Current conver-
3.9 ms
DATA2
DATA 3
7.8 ms
ATmega406
DATA5
Figure 18-2
107