ATTINY43U-MU Atmel, ATTINY43U-MU Datasheet - Page 43

• 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

8.5.2
8.5.3
8.6
8.6.1
8048B–AVR–03/09
Component Selection
Switching to Full Duty Cycle Mode of Operation
Switching to Normal (Variable Duty Cycle) Mode of Operation
Inductor
To stop the boost converter, follow the below procedure:
When duty cycle control is disabled the output voltage of the boost converter will rise as fast as
possible, resulting in a minimum switching time and a maximum idle time for the converter.
To turn on Full Duty Cycle (FDC) mode, follow the below procedure:
To return duty cycle control to the boost converter, follow the below procedure:
Refer to
Low inductance increases peak currents of the inductor, creating more interference noise and
lowering the overall efficiency of the converter. Too high inductance values force the converter
into non-stable operation. The boost converter has been optimized for a certain size inductance,
L, and may not work reliably if other inductance values are used. See
nent Values” on page
The inductor must be able to tolerate the following input current:
... where
verter Efficiency vs. Load Current and VBAT Voltage” on page
The inductor must also be able to tolerate short peak currents. At steady state, i.e. when the
converter has stabilised after a constant load current has been introduced, the peak current is
calculated as follows:
1. Write 110x xxxx to the Power Reduction Register, PRR
2. Within 3 clock cycles of the above, write 10xx xxxx to PRR
3. Within 4 clock cycles of the first step, write 01xx xxxx to PRR
1. Write 110x xxxx to the Power Reduction Register, PRR
2. Within 3 clock cycles of the above, write 10xx xxxx to PRR
3. Within 4 clock cycles of the first step, write 111x xxxx to PRR
1. Write 111x xxxx to the Power Reduction Register, PRR
Figure 8-2 on page 37
η
is the efficiency of the converter at given voltages and load current. See
45.
for component placement and numbering.
I
PEAK
I
IN
=
=
V
--------------------------------
V
----------------------------------- -
CC
V
BAT
BAT
×
I
×
L
LOAD
×
T
η
S
×
D
166.
“Boost Converter Compo-
“Boost Con-
43