ATtiny43U Atmel Corporation, ATtiny43U Datasheet - Page 37

• Manufacturer Part Number: ATtiny43U
• 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

8.2
8048B–AVR–03/09
Modes of Operation
Figure 8-2.
When the boost converter is not connected the microcontroller can be powered directly from an
external source and is then subject to the standard supply voltage limits defined in
Characteristics” on page
It is recommended to disable the Brown-Out Detection (BOD) circuit when using the integrated
boost converter. This is because supply voltage of the microcontroller can drop to lowest BOD
levels during regular operation. See
The boost converter has three main modes of operation; Stop, Start, and Active. Operation
begins from Stop Mode and is transferred to Start Mode when input voltage, V
high for stable operation. When the converter has managed to raise the output voltage, V
sustainable level control is then transferred to the main mode of operation, Active Mode.
The modes of operation are illustrated in
Figure 8-3.
C
4
C
3
Typical Connection of Boost Converter.
Operating Modes of Boost Converter.
LOW CURRENT
155.
REGULATED
ACTIVE
ENTRY
MODE
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
VCC
GND
D
“Brown-out Detection” on page
1
VBAT
LSW
PA7
PA6
PA5
PA4
PA3
PA2
PA1
PA0
Figure
8-3, below.
C
2
MODE
STOP
L
R
1
1
START
MODE
C
50.
1
BAT
VIN
, is sufficiently
“Electrical
CC
, to a
37