ATmega16HVB datasheet(148/273 Pages) ATMEL

148 / 273 page

148

8042A–AVR–07/09

ATmega16HVB/32HVB

25. FET Driver

25.1

Features

• High side N-channel FET driver for controlling Charge and Discharge FETs in Li-ion battery

application

• Optional Deep Under-voltage Recovery mode allowing normal operation while charging Deeply

discharged battery cells from 0-volt without an external Pre-charge FET

• Optional Pre-charge FET mode that allows chargers without pre-charge functionality to charge a

Deeply discharged battery from 0-volt

25.2

Overview

The ATmega16HVB/32HVB integrates an N-channel FET driver for turning on and off external

high-side Charge and Discharge FETs in Li-ion battery packs. The FET driver is designed for

outputting a high voltage gate overdrive of typically 13V during normal operation.

Figure 25-1. Simplified Block diagram.

In normal operation FET is controlled by software. SW can enable and disable the Charge FET

and the Discharge FET by writing to the FET Control and Status Register (FCSR).

RPC

ATmega16HVB/32HVB

VFET

BATT

RDF

RCF

RBATT

PC5

RPF

QDF

QPF

QCF

RPVT

PVT

FET CONTROL

FET DRIVER

CHARGER

DETECT

OPTIONAL

2-4

Li-Ion

Cells

Battery

Pack

Device

Charger

ATmega16HVB Datasheet(PDF) 148 Page - ATMEL Corporation

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