ATMEGA8HVA-4CKU Atmel, ATMEGA8HVA-4CKU Datasheet - Page 137
![MCU AVR 8K FLASH 4MHZ 36-LGA](/photos/12/32/123221/36ck1-lga_sml.jpg)
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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24.3
8024A–AVR–04/08
DUVR – Deep Under-Voltage Recovery Mode operation
Figure 24-3. Switching NFET on and off during NORMAL operation
The purpose of DUVR mode is to control the Charge FET so that the VFET voltage is above the
minimum operating voltage while charging cells below minimum operating voltage. This is useful
when the cell has been discharged below the minimum operating voltage of the chip. In DUVR
mode the Charge FET is switched partly on to provide a suitable voltage drop between the cell
voltage and the VFET terminal. As the cell voltage increases, the voltage drop across the
Charge FET will gradually decrease until the Charge FET is switched completely on. This means
that for high cell voltages, DUVR mode operation is equivalent to normal enabling of the Charge
FET (CFE=1).
ATmega8HVA/16HVA should operate in DUVR mode until software detects that the cell has
recovered from Deep Under-Voltage condition. When the cell has recovered from Deep Under-
Voltage condition, software should first set CFE=1. This is safe now since the cell voltage is
above minimum operating voltage. After that software should disable DUVR mode by setting
DUVRD = 1.
If both DUVRD and CFE bit is set before the cell voltage is above minimum operating voltage,
the VFET voltage will drop and the chip will enter BOD reset and switch off both the Charge- and
Discharge FET. Switching off the FET’s will cause the VFET voltage to rise again so that the
chip restarts from BOD reset, with DUVRD = 0 and CFE = 0 (default values). To avoid this, soft-
ware must always check the cell voltage by V-ADC measurements before setting CFE=1.
DUVR mode is default enabled after reset. However, while the chip is in reset state, DUVR
mode is disabled. This is a safety feature that ensures that the Charge FET will not be switched
on until the Charge Over-current Protection is operating. This implies that the DUVR mode will
be disabled from the time that a charger is connected until the selected start-up time expired.
During this period, the VFET voltage will be higher than the normal VFET Level in DUVR mode.
For more details about DUVR mode, refer to application note AVR354.
12.0
11.0
10.0
-1.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
100
Time (ms)
ATmega8HVA/16HVA
200
300
137
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