ATmega406 Atmel Corporation, ATmega406 Datasheet - Page 246
ATmega406
Manufacturer Part Number
ATmega406
Description
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATmega406-1AAU
Manufacturer:
AT
Quantity:
20 000
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246
ATmega406
Figure 36-1. CM Offset with unbalanced cells.
2. Voltage Reference spike
Problem Fix/Workaround
Avoid getting unbalanced cells by using the internal cell balancing FETs.
The Voltage Reference, VREF, will spike each time the internal temperature sensor is
enabled. The temperature sensor is enabled when the VTEMP is selected in the VADMUX
register and the V-ADC is enabled by the VADEN bit.
The spike will be approximately 50mV and lasts for about 5ms, and it will affect any ongoing
current accumulation in the CC-ADC, as well as V-ADC conversions in the period of the
spike.
Figure 36-2 on page 247
illustrates the Voltage Reference spike.
2548E–AVR–07/06
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