ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 275
ATmega32C1 Automotive
Manufacturer Part Number
ATmega32C1 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.ATMEGA16M1_AUTOMOTIVE.pdf
(12 pages)
3.ATMEGA16M1_AUTOMOTIVE.pdf
(25 pages)
4.ATMEGA16M1_AUTOMOTIVE.pdf
(367 pages)
Specifications of ATmega32C1 Automotive
Flash (kbytes)
32 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
27
Ext Interrupts
27
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Can
1
Lin
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
4
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 150
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
- AT90CAN128_AUTOMOTIVE PDF datasheet
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #2
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #3
- ATMEGA16M1_AUTOMOTIVE PDF datasheet #4
- Current page: 275 of 367
- Download datasheet (7Mb)
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
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