Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 90)

8052B–AVR–09/08

ATmega4HVD/8HVD

17. ADC - Analog-to-Digital Converter

17.1 Features

• 10-bit Resolution

• 78 µs Conversion Time @ clk

ADC

= 167 kHz

• Up to 13 kSPS at Maximum Resolution

• External Input Channel with 0 - 5V Input Voltage Range

• External Input Channel (ADC0) with 0 - 1V Input Voltage Range

• Internal Temperature Sensor Input Channel

• 1.1V ADC Reference Voltage (typical value)

• Interrupt on ADC Conversion Complete

• Sleep Mode Noise Canceler

The ATmega4HVD/8HVD features a 10-bit successive approximation ADC. The single-ended

voltage inputs refer to 0V.

The ADC contains a Sample and Hold circuit which ensures that the input voltage to the ADC

is held at a constant level during conversion. A block diagram of the ADC is shown in Figure

17-1.

Internal reference voltage of nominally 1.1V is provided on-chip. External input on PV1 pin is

divided by 5 internally to be within the range of the internal reference votlage.

Figure 17-1. Analog-to-Digital Converter Block Schematic

ADC CONVERSION COMPLETE IRQ

8-BIT DATABUS

15 0

ADC CONTROL & STATUS

ADC DATA REGISTER

(ADCH/ADCL)

ADIE

ADSC

ADEN

ADIF

CONVERSION LOGIC

10-BIT DAC

SAMPLE & HOLD

COMPARATOR

INTERNAL 1.1V

REFERENCE

PV1

GND

ADC[9:0]

1/5

TEMPERATURE

SENSOR

AGND

ADTEMP

MUX

ADC0

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 167 168

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