AT90PWM3B Atmel Corporation, AT90PWM3B Datasheet - Page 48
AT90PWM3B
Manufacturer Part Number
AT90PWM3B
Description
Manufacturer
Atmel Corporation
Specifications of AT90PWM3B
Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
27
Ext Interrupts
4
Usb Speed
No
Usb Interface
No
Spi
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
11
Adc Resolution (bits)
10
Adc Speed (ksps)
125
Analog Comparators
3
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.5
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 105
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
5
Output Compare Channels
16
Input Capture Channels
1
Pwm Channels
12
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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9.0.5
48
AT90PWM2/3/2B/3B
Brown-out Detection
AT90PWM2/2B/3/3B has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
level 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 9-2.
Notes:
Table 9-3.
Notes:
When the BOD is enabled, and V
9-5), 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
BOT
BOD
BOT+
HYST
+ V
BODLEVEL 2..0 Fuses
in
1. V
2. Values are guidelines only.
1. Values are guidelines only.
HYST
BOD
Figure
this is the case, the device is tested down to V
antees that a Brown-Out Reset will occur before V
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 010 for Low Operating Voltage and BODLEVEL = 101 for High Operating Volt-
age .
BOT
/2 and V
given in
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
111
110
101
100
011
010
001
000
may be below nominal minimum operating voltage for some devices. For devices where
9-5), the delay counter starts the MCU after the Time-out period t
BOT-
Table
= V
9-3.
BOT
- V
CC
HYST
decreases to a value below the trigger level (V
Min V
(1)(2)
/2.
(1)
CC
BOT
if the voltage stays below the trigger level for lon-
CC
Typ V
= V
Min.
4.5
2.7
4.3
4.4
4.2
2.8
2.6
BOT
BOD Disabled
CC
CC
BOT
during the production test. This guar-
increases above the trigger level
drops to a voltage where correct
Typ.
70
2
Max V
Max.
BOT
4317J–AVR–08/10
BOT-
TOUT
in
Units
Units
mV
BOT+
Figure
V
V
V
V
V
V
V
µs
has
CC
=
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