ATMEGA406-1AAU Atmel, ATMEGA406-1AAU Datasheet - Page 22

• 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

8.3
22
Rev. D
ATmega406
Figure 8-4.
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1. Voltage-ADC Failing at Low Temperatures
1. Voltage-ADC Common Mode Offset
Voltage ADC not functional below 0
Voltage-ADC Common Mode Offset
Voltage Reference Spike
Voltage Regulator Start-up sequence
V
EEPROM read from application code does not work in Lock Bit Mode 3
REF
VADMUX3:0
If the CC-ADC is doing current accumulation while the V-ADC is doing temperature mea-
surement, both the Instantaneous and the Accumulated conversion results will be affected.
The spike on VREF will be visible on 1 Accumulated Current (CADAC3…0) and 2 Instanta-
neous Current (CADIC1…0) conversion results.
Voltage ADC not functional below 0°C. The voltage ADC has a very large error below 0°C,
and can not be used
Problem Fix/Workaround
The cell conversion will have an Offset-error depending on the Common Mode (CM) level.
This means that the error of a cell is depending on the voltage of the lower cells. The CM
Offset is calibrated away in Atmel production when the cells are balanced. When the cells
get un-balanced the CM depending offset will reappear:
influenced by MCU state
VADSC
1.1 V
Voltage
XXX
Voltage Reference Spike
V~50mV
°C
(10 VTEMP conversion in a row)
VTEMP
t ~< 5ms
VREF
time
2548ES–AVR–07/06