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8042AS–AVR–09/08

ATmega16HVB/32HVB

short), illegal charger connection or software runaway. This makes ATmega16HVB/32HVB the

ideal 1-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 - 25 volts. This voltage is regulated to a constant supply voltage of

nominally 3.3 volts for the integrated logic and analog functions. The regulator capabilities, com-

bined 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 patented Deep Under-voltage Recovery (DUVR) mode that supports

pre-charging of deeply discharged battery cells without using a separate Pre-charge FET.

Optionally, Pre-charge FETs are supported for integration into many existing battery charging

schemes.

The battery protection monitors the charge and discharge current to detect illegal conditions and

protect the battery from these when required. A 12-bit Voltage ADC allows software to monitor

each cell voltage individually with high accuracy. The ADC also provides one internal input chan-

nel to measure on-chip temperature and two input channels intended for external thermistors.

An 18-bit ADC optimized for Coulomb Counting accumulates charge and discharge currents and

reports accumulated current with high resolution and accuracy. It can also be used to provide

instantaneous current measurements with 13 bit resolution. Integrated Cell Balancing FETs

allow cell balancing algorithms to be implemented in software.

The MCU provides the following features: 16K/32K bytes of In-System Programmable Flash with

Read-While-Write capabilities, 512/1K bytes EEPROM, 1K/2K bytes SRAM. 32 general purpose

working registers, 12 general purpose I/O lines, 5 general purpose high voltage open drain I/O

lines, one general purpose super high voltage open drain output, debugWIRE for On-chip

debugging and SPI for In-system Programming, a SM-Bus compliant TWI module, two flexible

Timer/Counters with Input Capture and compare modes.

Internal and external interrupts, a 12-bit Sigma Delta ADC for voltage and temperature measure-

ments, a high resolution Sigma Delta ADC for Coulomb Counting and instantaneous current

measurements, integrated cell balancing FETs, Additional Secure Authentication Features, an

autonomous Battery Protection module, a programmable Watchdog Timer with internal Oscilla-

tor, and software selectable power saving modes.

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achieving throughputs up to ten times faster than con-

ventional CISC microcontrollers.

The device is manufactured using Atmel’s high voltage high density non-volatile memory tech-

nology. The On-chip ISP Flash allows the program memory to be reprogrammed In-System,

through an SPI serial interface, by a conventional non-volatile memory programmer or by an On-

chip Boot program running on the AVR core. The Boot program can use any interface to down-

load the application program in the Application Flash memory. Software in the Boot Flash

section will continue to run while the Application Flash section is updated, providing true Read-

While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable-

Flash and highly accurate analog front-end in a monolithic chip.

The Atmel ATmega16HVB/32HVB is a powerful microcontroller that provides a highly flexible

and cost effective solution. It is part of the AVR Smart Battery family that provides secure