ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 17

• Manufacturer Part Number: ATmega406
• Manufacturer: Atmel Corporation

Specifications of ATmega406

• Flash (kbytes): 40 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 1 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 18
• Ext Interrupts: 4
• Usb Speed: No
• Usb Interface: No
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -30 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 2
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8. Errata
8.1
2548ES–AVR–07/06
Rev. F
•
•
1. Voltage-ADC Common Mode Offset
Voltage-ADC Common Mode Offset
Voltage Reference Spike
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:
a. Cell 1 defines its own CM level, and will never be affected by the CM dependent
b. The CM level for Cell 2 will change if Cell 1 voltage deviates from Cell 2 voltage.
c. The CM level for Cell 3 will change if Cell 1 and/or Cell 2 voltage deviates from the
d. The CM level for Cell 4 will change if Cell 1, Cell 2 and/or Cell 3 deviate from the volt-
Figure 9-1 on page
anced cells.
offset.
voltage at Cell 3. The worst-case error is when Cell 1 and 2 are balanced while Cell 3
voltage deviates from the voltage at Cell 1 and 2.
age at Cell 4. The worst-case error is when Cell 1, Cell 2 and Cell 3 are balanced
while Cell 4 voltage deviates from the voltage at Cell 1, 2 and 3.
18, shows the error of Cell2, Cell3 and Cell4 with 5% and 10% unbal-
ATmega406
17