ATMEGA64M1-15MZ Atmel, ATMEGA64M1-15MZ Datasheet - Page 275

• Manufacturer Part Number: ATMEGA64M1-15MZ
• Description: MCU AVR 64KB FLASH 3PSC 32-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64M1-15MZ

• Package / Case: 32-VQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Connectivity: CAN, LIN, SPI, UART/USART
• Core Size: 8-Bit
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATADAPCAN01
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Lead Free Status / Rohs Status: Details

22. Analog Feature Considerations
22.1
22.2
22.3
7647G–AVR–09/11
Use of an Amplifier as Comparator Input
Use of an Amplifier as Comparator Input and ADC Input
Purpose
The ATmega16/32/64/M1/C1 features several analog features such as ADC, DAC, Amplifiers,
Comparators...
The purpose of this section is to describe the interaction between these features. This section
explains how to set the specific registers to get the system running.
Particularly the different peripheral clocks can interfere together, so special care has to be
considered.
The internal amplifiers provide differential amplification for ADC converter. To allow signed
result with the ADC, the output level of the amplifiers is shifted up with a Vref/2 voltage.
For this reason, when used with a comparator, a Vref/2 voltage is added to the voltage of the
amplifier outputs.
Figure 22-1. Amplifier and Comparator
The amplifier Clock comes from the ADC and is equal to the ADC Clock divided by 8.
The amplifier can be used as ADC input while it is used as comparator input. In that case,
each time the amplifier is selected as ADC input, the sampling and hold circuit of the ADC
loads the amplifier output. It results a decrease of the amplifier output voltage which can tog-
gle the comparator output.
ACMPx
AMPx+
AMPx-
AMPCMPx
Amplifier
Clock
+
-
AMPx
Atmel ATmega16/32/64/M1/C1
Analog Comparator
Negative Input
Comparator
Clock
+
-
ACxEN
Analog Comparator
Output
275