AT90S2333-8AI Atmel, AT90S2333-8AI Datasheet - Page 21
![IC MCU 2K 8MHZ A/D IT 32TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
AT90S2333-8AI
Manufacturer Part Number
AT90S2333-8AI
Description
IC MCU 2K 8MHZ A/D IT 32TQFP
Manufacturer
Atmel
Series
AVR® 90Sr
Datasheet
1.AT90LS2333-4AC.pdf
(103 pages)
Specifications of AT90S2333-8AI
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
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4 V ~ 6 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-TQFP, 32-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Figure 26. MCU Start-Up, RESET Controlled Externally
External Reset
An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate a reset, even
if the clock is not running. Shorter pulses are not guaranteed to generate a reset.When the applied signal reaches the
Reset Threshold Voltage V
expired.
Figure 27. External Reset During Operation
Brown-Out Detection
AT90S2333/4433 has an on-chip brown-out detection (BOD) circuit for monitoring the V
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
below the trigger level, the brown-out reset is immediately activated. When V
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,
in 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
4.0V, 7 µs for trigger level 2.7V (typical values).
INTERNAL
TIME-OUT
RESET
RESET
VCC
RST
on its positive edge, the delay timer starts the MCU after the Time-out period t
V
CC
POT
if the voltage stays below the trigger level for longer than 3 µs for trigger level
AT90S/LS2333 and AT90S/LS4433
V
RST
t
TOUT
CC
increases above the trigger level, the
CC
level during the operation. The
CC
decreases to a value
TOUT
has
21
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