AT90USB1286 Atmel Corporation, AT90USB1286 Datasheet - Page 60

• Manufacturer Part Number: AT90USB1286
• Manufacturer: Atmel Corporation

Specifications of AT90USB1286

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 48
• Ext Interrupts: 16
• 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: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Eeprom (bytes): 4096
• 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: 10
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8.5
60
Brown-out Detection
AT90USB64/128
Figure 8-4.
AT90USB64/128 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
during operation by comparing it to a fixed trigger level. The trigger level for the 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
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
Symbol
V
t
Ibod
BOT
BOD
BOT+
HYST
+ V
BODLEVEL 2..0 Fuses
in
HYST
BOD
Figure
CC
/2 and V
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Brown-out Detector Consumption
given in
External Reset During Operation
BODLEVEL Fuse Coding
Brown-out Characteristics
111
110
101
100
011
010
001
000
8-5), the delay counter starts the MCU after the Time-out period t
BOT-
Table
= V
8-1.
BOT
- V
CC
HYST
Min V
decreases to a value below the trigger level (V
2.4
3.2
3.3
4.1
/2..
BOT
CC
if the voltage stays below the trigger level for lon-
Typ V
2.6
3.4
3.5
4.3
BOD Disabled
Reserved
BOT
Min
CC
increases above the trigger level
Typ
50
25
Max V
2.8
3.6
3.7
4.5
BOT
Max
V
Units
Units
mV
µA
ns
7593K–AVR–11/09
BOT-
TOUT
in
CC
BOT+
Figure
level
has
=