ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 52
ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2.1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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8.0.5
7766F–AVR–11/10
Brown-out Detection
ATmega16U4/ATmega32U4 has an On-chip Brown-out Detection (BOD) circuit for monitoring
the V
BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure
spike free Brown-out Detection. The hysteresis on the detection level should be interpreted as
V
Table 8-2.
Table 8-3.
When the BOD is enabled, and V
8-5), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
ger than t
Figure 8-5.
Symbol
V
t
BOT+
BOD
BOT+
HYST
CC
= V
BODLEVEL 2..0 Fuses
in
level during operation by comparing it to a fixed trigger level. The trigger level for the
BOD
BOT
Figure
+ V
given in
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Brown-out Reset During Operation
INTERNAL
TIME-OUT
111
110
101
100
011
010
001
000
HYST
8-5), the delay counter starts the MCU after the Time-out period t
RESET
RESET
V
CC
/2 and V
Table
8-1.
BOT-
CC
= V
decreases to a value below the trigger level (V
BOT
V
BOT-
Min V
- V
1.8
2.0
2.2
2.4
3.2
3.3
4.0
CC
HYST
BOT
if the voltage stays below the trigger level for lon-
/2.
Typ V
2.0
2.2
2.4
2.6
3.4
3.5
4.3
BOD Disabled
CC
BOT
V
t
TOUT
Min
BOT+
increases above the trigger level
ATmega16/32U4
Typ
50
Max V
2.2
2.4
2.6
2.8
3.6
3.7
4.5
BOT
Max
BOT-
TOUT
in
Units
Units
mV
Figure
V
ns
has
52
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