ATMEGA16HVA-4TU Atmel, ATMEGA16HVA-4TU Datasheet - Page 119
ATMEGA16HVA-4TU
Manufacturer Part Number
ATMEGA16HVA-4TU
Description
MCU AVR 16K FLASH 4MHZ 28-TSOP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA16HVA-4CKU.pdf
(196 pages)
Specifications of ATMEGA16HVA-4TU
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
16KB (8K 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
28-TSOP
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA16HVA-4TU
Manufacturer:
Atmel
Quantity:
20
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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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