ATMEGA8HVD-4MX Atmel, ATMEGA8HVD-4MX Datasheet - Page 44

• Manufacturer Part Number: ATMEGA8HVD-4MX
• Description: MCU AVR 8K FLASH 2.1-8V 4MHZ QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8HVD-4MX

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• 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): 2 V ~ 2.4 V
• Data Converters: A/D 1x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 18-MLF® Exposed Pad (Staggered Leads), DFN
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Connectivity: -

44
ATmega4HVD/8HVD
Figure 10-9. Powering up ATmega4HVD/8HVD (2-FET example)
During the initial start-up when a valid reference for the voltage regulator is missing, VCC is
driven as close as possible to VFET. Voltage regulation will only start when VCC has reached
VBLOT, start-up, which represents the voltage level that guarantees proper start-up conditions
for the voltage regulator.
Even though the voltage regulator has started up and the digital part is powered, the chip is
kept in the RESET state and cell charging is disabled until VCC exceeds V
time from a charger is connected until this happens is very short in the two- FET application
(actual timing depends on the CREG value). Once the condition VCC > V
BLOD is released and the Reset Delay counter starts counting. For details, see
Deep Under-Voltage Recovery Mode operation” on page
VCC will now be regulated to its nominal value. The Reset Delay counter makes sure that the
chip is continuously kept in RESET state internally for a time corresponding to the start-up
time selected by the SUT fuses (time indicated as t
INTERNAL_RESET
V
CHIP STATE
BLOT, START-UP
BLOD
V
V
2.2 V
POR
V
BATT
CC
OC
OD
POT
CHARGER CONNECTED
Power-off
CHARGER DETECTED
TOUT
in
117.
Figure 10-9 on page
Reset
t
TOUT
Active
BLOT, start-up is
BLOT, start-up
44).
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