ATtiny43U Atmel Corporation, ATtiny43U Datasheet - Page 50
ATtiny43U
Manufacturer Part Number
ATtiny43U
Description
Manufacturer
Atmel Corporation
Specifications of ATtiny43U
Flash (kbytes)
4 Kbytes
Pin Count
20
Max. Operating Frequency
8 MHz
Cpu
8-bit AVR
# Of Touch Channels
8
Hardware Qtouch Acquisition
No
Max I/o Pins
16
Ext Interrupts
16
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
0.25
Eeprom (bytes)
64
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 85
I/o Supply Class
0.7 to 5.5
Operating Voltage (vcc)
0.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
2
Output Compare Channels
4
Pwm Channels
4
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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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
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