ATMEGA8HVD-4MX Atmel, ATMEGA8HVD-4MX Datasheet - Page 43
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ATMEGA8HVD-4MX
Manufacturer Part Number
ATMEGA8HVD-4MX
Description
MCU AVR 8K FLASH 2.1-8V 4MHZ QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA8HVD-4MX.pdf
(168 pages)
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
-
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10.6.2
8052B–AVR–09/08
Start-up with two FETs connected
chip is powered and an internal Power-on Reset (POR) is generated. 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 V
sents 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 RESET state until VCC exceeds V
is met, BLOD will be released and the Reset Delay counter starts counting. VREG will now be
regulated to its nominal value. The Reset Delay counter makes sure that the chip is continu-
ously kept in RESET state internally for a time corresponding to the start-up time selected by
the SUT fuses (time indicated as t
quence of this start-up scheme, the start-up period must be measured from BLOD is released,
and not from the time that a charger is connected. The time from a charger is detected until
BLOD is released may be significant in the one-FET application if the V
mum and BLOD level is at its maximum.
During start-up VCC may exceed its nominal value of operation for a short time period. This
overshoot will typically occur when V
output follows VFET until the regulator enters normal mode. However, this situation will only
occur during start-up while the chip is kept in RESET state, and will not occur in normal
operation.
For two FET applications, the VFET node is high-impedant as long as C-FET is switched off.
This means that the VFET voltage and hence also the BATT voltages increase rapidly once a
charger is connected. The charger will be detected almost immediately and the voltage regula-
tor is switched on.
A typical start-up sequence for the application is illustrated in
TOUT
BLOT, START-UP
in
BLOT, start-up
Figure 10-8 on page
is at its maximum value since the regulator
. Once the condition VCC > V
ATmega4HVD/8HVD
Figure 10-9 on page
42). Note that as a conse-
BLOT, start-up
POT
level is at its mini-
, which repre-
44.
BLOT, start-up
43
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