ATtiny461A Atmel Corporation, ATtiny461A Datasheet - Page 136

• Manufacturer Part Number: ATtiny461A
• Manufacturer: Atmel Corporation

Specifications of ATtiny461A

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

14. AC – Analog Comparator
14.1
136
Analog Comparator Multiplexed Input
ATtiny261A/461A/861A
The analog comparator compares the input values on the selectable positive pin (AIN0, AIN1 or
AIN2) and selectable negative pin (AIN0, AIN1 or AIN2). When the voltage on the positive pin is
higher than the voltage on the negative pin, the Analog Comparator Output, ACO, is set. The
comparator can trigger a separate interrupt, exclusive to the analog comparator. The user can
select Interrupt triggering on comparator output rise, fall or toggle. A block diagram of the com-
parator and its surrounding logic is shown in
Figure 14-1.
Notes:
See
When the Analog to Digital Converter (ADC) is configurated as single ended input channel, it is
possible to select any of the ADC[10:0] pins to replace the negative input to the analog compar-
ator. The ADC multiplexer is used to select this input, and consequently, the ADC must be
switched off to utilize this feature. If the Analog Comparator Multiplexer Enable bit (ACME in
ADCSRB) is set and the ADC is switched off (ADEN in ADCSRA is zero), MUX[5:0] in ADMUX
select the input pin to replace the negative input to the analog comparator, as shown in
14-1. If ACME is cleared or ADEN is set, either AIN0, AIN1 or AIN2 is applied to the negative
input to the analog comparator.
Table 14-1.
AIN0
AIN1
AIN2
ACME
Figure 1-1 on page 2
0
0
0
0
1. See
ADC MULTIPLEXER
ACM[2:0]
ACME
ADEN
REFERENCE
OUTPUT
BANDGAP
Analog Comparator Multiplexed Input
Table 14-1 on page
Analog Comparator Block Diagram
ADEN
MUX
(1)
x
x
x
x
ACBG
and
MUX[5:0]
Table 10-3 on page 62
xxxxxx
xxxxxx
xxxxxx
xxxxxx
136.
ACD
+
_
VCC
Figure
ACM[2:0]
000
001
010
011
14-1.
for Analog Comparator pin placement.
ACIS1
INTERRUPT
SELECT
Positive Input
ACIS0
AIN0
AIN0
AIN1
AIN1
ACIE
ACO
Negative Input
8197C–AVR–05/11
AIN1
AIN2
AIN0
AIN2
ANALOG
COMP ARATOR
IRQ
ACI
Table