ATMEGA8HVA-4CKU Atmel, ATMEGA8HVA-4CKU Datasheet - Page 119
ATMEGA8HVA-4CKU
Manufacturer Part Number
ATMEGA8HVA-4CKU
Description
MCU AVR 8K FLASH 4MHZ 36-LGA
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA8HVA-4CKU
Core Processor
AVR
Core Size
8-Bit
Speed
4MHz
Connectivity
SPI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
7
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 9 V
Data Converters
A/D 5x12b
Oscillator Type
External
Operating Temperature
-20°C ~ 85°C
Package / Case
36-LGA
Processor Series
ATMEGA8x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
512 B
Interface Type
SPI
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
6
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATAVRSB200, ATAVRSB201
Minimum Operating Temperature
- 20 C
On-chip Adc
12 bit, 5 Channel
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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21.3.2
8024A–AVR–04/08
BGCRR – Bandgap Calibration R Register
• Bit 7:0 – BGCR7:0: BG Calibration of Resistor ladder
These bits are used for temperature gradient adjustment of the bandgap reference.
illustrates VREF as a function of temperature. VREF has a positive temperature coefficient at
low temperatures and negative temperature coefficient at high temperatures. Depending on the
process variations, the top of the VREF curve may be located at higher or lower temperatures.
To minimize the temperature drift in the temperature range of interest, BGCRR is used to adjust
the top of the curve towards the centre of the temperature range of interest. The BGCRR bits are
thermometer coded, resulting in 9 possible settings: 00000000, 00000001, 00000011,
00000111, … , 11111111. The value 00000000 shifts the top of the VREF curve to the highest
possible temperature, and the value 11111111 shifts the top of the VREF curve to the lowest
possible temperature.
Figure 21-2. Illustration of VREF as a function of temperature.
Bit
(0xD1)
Read/Write
Initial Value
1.5
0.5
1
0
-40
BGCR7
R/W
-20
7
0
BGCR6
R/W
6
0
0
BGCR5
R/W
5
0
Temperature range of interest
20
Temperature [
BGCR4
R/W
4
0
o
C]
40
BGCRR is used to move the top of the VREF
curve to the center of the tempearture range of
interest.
BGCR3
R/W
3
1
ATmega8HVA/16HVA
BGCR2
60
R/W
1
2
BGCR1
R/W
1
1
80
BGCR0
R/W
0
1
100
Figure 21-2
BGCRR
119
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