Datasheet

5
8042ES–AVR–09/2013
ATmega16HVB/32HVB
2. Overview
The Atmel ATmega16HVB/32HVB is a monitoring and protection circuit for 3- and 4-cell Li-ion
applications with focus on highest safety including safe authentication, low cost and high utiliza-
tion of the cell energy. The device contains secure authentication features as well as
autonomous battery protection during charging and discharging. The External Protection Input
can be used to implement other battery protection mechanisms using external components, for
example, protection against chargers with too high charge voltage can be easily implemented
with a few low cost passive components. The feature set makes the ATmega16HVB/32HVB a
key component in any system focusing on high security, battery protection, high system utiliza-
tion and low cost.
Figure 2-1. Block diagram.
ATmega16HVB/32HVB provides the necessary redundancy on-chip to make sure that the bat-
tery is protected in critical failure modes. The chip is specifically designed to provide safety for
the battery cells in case of pin shorting, loss of power (either caused by battery pack short or
VCC short), illegal charger connection or software runaway. This makes ATmega16HVB/32HVB
the ideal one-chip solution for applications with focus on high safety.
The ATmega16HVB/32HVB features an integrated voltage regulator that operates at a wide
range of input voltages, 4 - 18 volts. This voltage is regulated to a constant supply voltage of
PORTA (4)
SRAMFlash
CPU
EEPROM
PV2
NV
OC
FET
Control
Voltage
ADC
Voltage
Reference
Coulomb
Counter ADC
GND
VCC
RESET/dW
Power
Supervision
POR &
RESET
Watchdog
Oscillator
Watchdog
Timer
Oscillator
Circuits /
Clock
Generation
VREF
VREFGND
PI
NI
PA3..0
PA1..0
8/16-bit T/C1
8/16-bit T/C0
PORTB (8)
PB7..0
SPI
Voltage
Regulator
Charger
Detect
VFET
VREG
BATT
PV1
DATA BU S
V PTAT
Current
Protection
Security
Module
PORTC (6)
PC5..0
Voltage Regulator
Monitor Interface
PB0
Oscillator
Sampling
Interface
Program
Logic
debugWIRE
Cell
Balancing
PV3
PV4
TWI
PPI
NNI
OD
PORTA (4)
SRAMFlash
CPU
EEPROM
PV2
NV
OC
FET
Control
Voltage
ADC
Voltage
Reference
Coulomb
Counter ADC
GND
VCC
RESET/dW
Power
Supervision
POR &
RESET
Watchdog
Oscillator
Watchdog
Timer
Oscillator
Circuits /
Clock
Generation
VREF
VREFGND
PI
NI
PA3..0
PA1..0
8/16-bit T/C1
8/16-bit T/C0
PORTB (8)
PB7..0
SPI
Voltage
Regulator
Charger
Detect
VFET
VREG
BATT
PV1
DATA BU S
V PTAT
Current
Protection
Security
Module
PORTC (6)
PC5..0
Voltage Regulator
Monitor Interface
PB0
Oscillator
Sampling
Interface
Program
Logic
debugWIRE
Cell
Balancing
PV3
PV4
TWI
PPI
NNI
OD