ATTINY43U-MU Atmel, ATTINY43U-MU Datasheet - Page 50

• Manufacturer Part Number: ATTINY43U-MU
• Description: MCU AVR 4K FLASH 8MHZ 20-QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY43U-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-MLF®, QFN
• Processor Series: ATTINY4x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 4 Channel
• For Use With: ATSTK600-TINYX3U - STK600 SOCKET/ADAPTER TINYX3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.4
9.5
50
External Reset
Brown-out Detection
ATtiny43U
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see
clock is not running. Shorter pulses are not guaranteed to generate a reset. When the applied
signal reaches the Reset Threshold Voltage – V
starts the MCU after the Time-out period – t
Figure 9-4.
ATtiny43U has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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
and V
When the BOD is enabled, and V
9-5 on page
trigger level (V
out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 9-5.
BOT-
BOD
= V
TOUT
CC
50), the Brown-out Reset is immediately activated. When V
INTERNAL
TIME-OUT
given in
BOT
External Reset During Operation
Brown-out Reset During Operation
BOT+
RESET
RESET
has expired.
- V
V
CC
in
HYST
Figure 9-5 on page
Table 20-4 on page
/2.
CC
decreases to a value below the trigger level (V
Table 20-4 on page
V
BOT-
50), the delay counter starts the MCU after the Time-
158.
CC
TOUT
if the voltage stays below the trigger level for lon-
– has expired.
RST
– on its positive edge, the delay counter
158) will generate a reset, even if the
V
t
TOUT
BOT+
CC
BOT+
increases above the
= V
CC
8048B–AVR–03/09
BOT
BOT-
level during
+ V
in
Figure
HYST
/2