ATmega16HVB datasheet(123/273 Pages) ATMEL

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123

8042A–AVR–07/09

ATmega16HVB/32HVB

21. Voltage Reference and Temperature Sensor

21.1

Features

• Accurate Voltage Reference of 1.100V

• Voltage Reference Calibration Interface

• Internal Temperature Sensor

• External Decoupling for Optimum Noise Performance

• Short Circuit Detection on the External Decoupling pin

• Low Power Consumption

21.2

Overview

ATmega16HVB/32HVB features a highly accurate low power On-chip Bandgap Reference Volt-

age, VREF of 1.100V. This reference voltage is used as reference for the On-chip Voltage

Regulator, the Brown-out Detector, the internal Cell Balancing, the Battery Protection, the V-

ADC and the CC-ADC. Figure 21-1 shows an overview of the On-chip voltage reference.

Figure 21-1. Bandgap Reference Voltage

In addition to the Bandgap Reference Voltage, the Voltage Reference includes a Calibration Unit

that enables run time calibration of the Reference Voltage, an On-chip temperature sensor for

monitoring the die temperature, and a Bandgap Short Detector to detect short circuit conditions

on the external VREF pin for highest safety.

BG Calibration

BG Control and Status

8-bit databus

Bangap Reference

w/ temperature sensor

BG Short Detector

VREF

VREFGND

IRQ

VPTAT

1.1V

Buffer

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