ATTINY43U-SUR Atmel, ATTINY43U-SUR Datasheet - Page 43
ATTINY43U-SUR
Manufacturer Part Number
ATTINY43U-SUR
Description
MCU AVR 4KB FLASH 8MHZ 20SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY43U-SU.pdf
(182 pages)
Specifications of ATTINY43U-SUR
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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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
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