ATmega8HVA Atmel Corporation, ATmega8HVA Datasheet - Page 5

• Manufacturer Part Number: ATmega8HVA
• Manufacturer: Atmel Corporation

Specifications of ATmega8HVA

• Flash (kbytes): 8 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 3
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 256
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -20 to 85
• I/o Supply Class: 1.8 to 9.0
• Operating Voltage (vcc): 1.8 to 9.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

2. Overview
Figure 2-1.
8024AS–AVR–04/08
RESET/dW
VFET
VREG
BATT
GND
VCC
CF1N
Block Diagram
Supervision
CF1P
Charger
Generation
Watchdog
Watchdog
Detect
Oscillator
Oscillator
Circuits /
RESET
POR &
Power
Timer
Clock
Regulator
Voltage
CF2P
The ATmega8HVA/16HVA is a monitoring and protection circuit for 1-cell and 2-cell Li-ion appli-
cations with focus on high security/authentication, accurate monitoring, low cost and high
utilization of the cell energy. The device contains secure authentication features as well as
autonomous battery protection during charging and discharging. The chip allows very accurate
accumulated current measurements using an 18-bit ADC with a resolution of 0.84 µV. The fea-
ture set makes the ATmega8HVA/16HVA a key component in any system focusing on high
security, battery protection, accurate monitoring, high system utilization and low cost.
A combined step-up and linear voltage regulator ensures that the chip can operate with supply
voltages as low as 1.8V for 1-cell applications. The regulator automatically switches to linear
mode when the input voltage is sufficiently high, thereby ensuring a minimum power consump-
tion at all times. For 2-cell applications, only linear regulation is enabled. The regulator
capabilities, combined with an extremely low power consumption in the power saving modes,
greatly enhances the cell energy utilization compared to existing solutions.
The chip utilizes Atmel's patented Deep Under-voltage Recovery (DUVR) mode that supports
pre-charging of deeply discharged battery cells without using a separate Pre-charge FET.
debugWIRE
CF2N
Oscillator
Sampling
Program
Interface
Logic
PB0
Voltage Regulator
Monitor Interface
Flash
CPU
PORTB (4)
DATA BUS
PB3..0
SRAM
SPI
PORTA (2)
PA1..0
8/16-bit T/C0
8/16-bit T/C1
PORTC (1)
EEPROM
Security
Module
PC0
ATmega8HVA/16HVA
PA1..0
Counter ADC
Protection
Reference
Control
Battery
Coulumb
Voltage
Voltage
FET
ADC
VPTAT
PV2
PV1
NV
VREF
VREFGND
PI
NI
OC
OD
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