AT90S4433-8PI Atmel, AT90S4433-8PI Datasheet - Page 25
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AT90S4433-8PI
Manufacturer Part Number
AT90S4433-8PI
Description
IC MCU 4K FLSH 8MHZ A/D IT 28DIP
Manufacturer
Atmel
Series
AVR® 90Sr
Datasheet
1.AT90S4433-8AC.pdf
(126 pages)
Specifications of AT90S4433-8PI
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
20
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 6 V
Data Converters
A/D 6x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
28-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT90S4433-8PI
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Brown-out Detection
Watchdog Reset
1042H–AVR–04/03
AT90S4433 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
level during the operation. The power supply must be decoupled with a 47 nF to 100 nF
capacitor if the BOD function is used. The BOD circuit can be enabled/disabled by the
fuse BODEN. When BODEN is enabled (BODEN programmed), and V
value below the trigger level, the Brown-out Reset is immediately activated. When V
increases above the trigger level, the Brown-out Reset is deactivated after a delay. The
delay is defined by the user in the same way as the delay of POR signal (see Table 5).
The trigger level for the BOD can be selected by the fuse BODLEVEL to be 2.7V
(BODLEVEL unprogrammed), or 4.0V (BODLEVEL programmed). The trigger level has
a hysteresis of 50 mV to ensure spike-free Brown-out Detection.
The BOD circuit will only detect a drop in V
for longer than 3 µs for trigger level 4.0V, 7 µs for trigger level 2.7V (typical values).
Figure 28. Brown-out Reset during Operation
When the Watchdog times out, it will generate a short reset pulse of one XTAL cycle
duration. On the falling edge of this pulse, the delay timer starts counting the Time-out
period (t
Figure 29. Watchdog Reset during Operation
TOUT
). See page 43 for details on operation of the Watchdog.
INTERNAL
TIME-OUT
RESET
RESET
VCC
V
BOT-
CC
if the voltage stays below the trigger level
V
t
TOUT
BOT+
AT90S/LS4433
CC
decreases to a
25
CC
CC