ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 45

• Manufacturer Part Number: ATmega16HVB
• Manufacturer: Atmel Corporation

Specifications of ATmega16HVB

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 17
• Ext Interrupts: 15
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 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: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

11.2.4
11.3
8042D–AVR–10/11
Reset and the voltage reference
Brown-out detection
Figure 11-4. Watchdog reset during operation.
Atmel ATmega16HVB/32HVB has an On-chip Brown-out Detection (BOD) circuit for monitoring
the V
a hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level
should be interpreted as V
The BOD is automatically enabled in all modes of operation, except in Power-off mode.
When the BOD is enabled, and V
11-5), the Brown-out Reset is immediately activated. When V
level (V
expired.
Figure 11-5. Brown-out reset during operation.
The Voltage Reference is important for the performance of the system as the V
be used as reference voltage for several modules. It is therefore important to notice that after a
reset condition the Voltage Reference needs calibration and settling before the V
accurate. For details on Voltage Reference calibration and settling time, see
and temperature sensor” on page
CC
BOT+
INTERNAL
level during operation by comparing it to a fixed trigger level V
TIME-OUT
RESET
RESET
in
FET
V
Figure
CC
11-5), the delay counter starts the MCU after the Time-out period t
BOT+
= V
CC
122.
BOT
V
decreases to a value below the trigger level (V
BOT-
+ V
CK
HYST
/2 and V
ATmega16HVB/32HVB
BOT-
= V
BOT
CC
V
t
TOUT
BOT+
- V
increases above the trigger
HYST
BOT
/2.
. The trigger level has
”Voltage reference
REF
REF
BOT-
voltage will
voltage is
in
TOUT
Figure
has
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