ATMEGA32U4-AU Atmel, ATMEGA32U4-AU Datasheet - Page 145

MCU AVR 32K FLASH 16MHZ 44-TQFP

ATMEGA32U4-AU

Manufacturer Part Number
ATMEGA32U4-AU
Description
MCU AVR 32K FLASH 16MHZ 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar

Specifications of ATMEGA32U4-AU

Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
26
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2.5K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 12x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Processor Series
ATMEGA32x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
2.5 KB
Interface Type
SPI/TWI/USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
26
Number Of Timers
5
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
12-ch x 10-bit
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
16MHz
Total Internal Ram Size
2.5KB
# I/os (max)
26
Number Of Timers - General Purpose
5
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
44
Package Type
TQFP
Controller Family/series
AVR MEGA
No. Of I/o's
26
Eeprom Memory Size
1KB
Ram Memory Size
2.5KB
Cpu Speed
16MHz
Rohs Compliant
Yes
For Use With
ATSTK524 - KIT STARTER ATMEGA32M1/MEGA32C1ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ATMEGA32U4-16AU
ATMEGA32U4-16AU

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15.5
7766F–AVR–11/10
Dead Time Generator
The Dead Time Generator is provided for the Timer/Counter4 PWM output pairs to allow driving
external power control switches safely. The Dead Time Generator is a separate block that can
be used to insert dead times (non-overlapping times) for the Timer/Counter4 complementary
output pairs OC4x and OC4x when the PWM mode is enabled and the COM4x1:0 bits are set to
“01”. The sharing of tasks is as follows: the Waveform Generator generates the Waveform Out-
put (OCW4x) and the Dead Time Generator generates the non-overlapping PWM output pair
from the Waveform Output. Three Dead Time Generators are provided, one for each PWM out-
put. The non-overlap time is adjustable and the PWM output and it’s complementary output are
adjusted separately, and independently for both PWM outputs.
Figure 15-6. Output Compare Unit, Block Diagram
The Dead Time Generation is based on the 4-bit down counters that count the dead time, as
shown in
can divide the Timer/Counter4 clock (PCK or CK) by 1, 2, 4 or 8. This provides for large range of
dead times that can be generated. The prescaler is controlled by two control bits DTPS41..40.
The block has also a rising and falling edge detector that is used to start the dead time counting
period. Depending on the edge, one of the transitions on the rising edges, OC4x or OC4x is
delayed until the counter has counted to zero. The comparator is used to compare the counter
with zero and stop the dead time insertion when zero has been reached. The counter is loaded
with a 4-bit DT4H or DT4L value from DT4 I/O register, depending on the edge of the Waveform
Output (OCW4x) when the dead time insertion is started. The Output Compare Output are
delayed by one timer clock cycle at minimum from the Waveform Output when the Dead Time is
adjusted to zero. The outputs OC4x and OC4x are inverted, if the PWM Inversion Mode bit
PWM4X is set. This will also cause both outputs to be high during the dead time.
Figure 15-7. Dead Time Generator
CK OR PCK
OCWnx
CLOCK
bottom
FOCn
top
TCCRnB REGISTER
Figure
PRE-SCALER
DEAD TIME
15-7. There is a dedicated prescaler in front of the Dead Time Generator that
PWMnx
Waveform Generator
WGMn0
CLOCK CONTROL
COMnx
CK OR PCK
OCWnx
CLOCK
DTn I/O REGISTER
4-BIT COUNTER
COMPARATOR
DTPSn
Dead Time Generator
DATA BUS (8-bit)
DTnH
ATmega16/32U4
DTnL
OCnx
OCnx
PWMnX
PWMnX
OCnx
OCnx
pin
pin
OCnx
OCnx
145

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