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

• 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: -

2. Overview
4
ATmega4HVD/8HVD
RESET/dW
The ATmega4HVD/8HVD is a monitoring and protection circuit for 1-cell Li-ion applications
with focus on high security/authentication, low cost and high utilization of the cell energy. The
device contains secure authentication features as well as autonomous battery protection dur-
ing charging and discharging. The External Protection Input can be used to implement other
battery protection mechanisms using external components, e.g. protection against chargers
with too high charge voltage can be easily implemented with a few low cost passive compo-
nents. The feature set makes the ATmega4HVD/8HVD a key component in any system
focusing on high security, battery protection, high system utilization and low cost.
Figure 2-1.
An integrated, low-dropout linear regulator that can handle input voltages as low as 2.1V,
ensures that the stored energy can be fully exploited. The regulator capabilities, combined
with a extremely low power consumption in the power saving modes, greatly enhances the cell
energy utilization compared to existing solutions.
The chip utilizes Atmel's Deep Under-voltage Recovery (DUVR) mode that supports pre-
charging of deeply discharged battery cells without using a separate Pre-charge FET. An
enhanced start-up scheme allows the chip to operate correctly even with only Discharge FET
connected. This makes it possible to further reduce system cost for applications that do not
require Charge Over-current protection.
The ATmega4HVD/8HVD contains a 10-bit ADC for cell voltage measurements. The ADC is
also used to monitor the on-chip temperature. Temperature is measured by the integrated
Voltage Reference, which contains a built-in temperature sensor. ATmega4HVD/8HVD con-
VFET
VREG
BATT
GND
VCC
Block Diagram
Supervision
Charger
Generation
Watchdog
Watchdog
Detect
Oscillator
Oscillator
Circuits /
RESET
POR &
Power
Timer
Clock
Regulator
Voltage
debugWIRE
Oscillator
Sampling
Program
Interface
Logic
PB2 (CKOUT)
Voltage Regulator
Monitor Interface
Flash
PORTB (3)
PB2:0
SPI
CPU
DATA BUS
SRAM
PORTC (2)
PC1:0
PB0 (ADC0)
8/16-bit T/C0
8/16-bit T/C1
Security
EEPROM
Module
PC1 (External Protection Input)
Protection
Reference
Control
Battery
Voltage
Voltage
FET
ADC
8052B–AVR–09/08
PV1
GND
NI
OC
OD