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參數(shù)資料
| 型號(hào)： | ID80C32E-25SHXXX:D |
| 廠商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 25 MHz, MICROCONTROLLER, CDIP40 |
| 封裝： | CERAMIC, DIP-40 |
| 文件頁(yè)數(shù)： | 147/210頁(yè) |
| 文件大?。?/td> | 5175K |
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41
8048C–AVR–02/12
ATtiny43U
Figure 8-7.
Typical Output Voltage of Boost Converter at Full and Variable Duty Cycle.
See section “Software Control of Boost Converter” on page 41 for instructions on how to turn on
and off duty cycle control.
The use of Full Duty Cycle mode is recommended only at low load currents.
8.4
Overload Behaviour
The output is considered overloaded when the load current, I
LOAD, exceeds the maximum given
in Table 20-7 on page 162. During an overload condition the boost converter operates at maxi-
mum duty cycle and can no longer regulate V
CC. If the overload condition prevails the output
voltage will drop as load current increases. If V
CC drops below its minimum level the converter
will switch to Start Mode.
In Start Mode the converter has a low load current capability, which means nearly all overload
current will be drained straight from the battery (or other power source) via the inductor and the
diode. The resistance of the inductor is typically very low and, provided the voltage of the power
source remains constant, the output voltage during overload will stabilise to battery voltage,
V
BAT, minus the forward voltage drop, VF, of the diode used.
8.5
Software Control of Boost Converter
The boost converter is an independent hardware module that requires no interaction by the
microcontroller, although some features can be controlled by firmware. Features that can be
controlled by firmware are described in the following sections.
8.5.1
Stopping the Boost Converter
The device firmware can stop the boost converter on demand. When issued a stop signal, the
boost converter will exit Active Mode and enter Stop Mode, as illustrated in Figure 8-3 on page
36. This procedure allows the device to read true battery voltage using the on-board ADC,
assess if the voltage is sufficient for the selected battery chemistry and then control the boost
converter accordingly.
Stopping the boost converter automatically sends a request to the device reset handler. This sig-
nal will eventually set the device in reset but only after the output voltage V
CC has dropped to a
level approximately two times the battery voltage. This means that for very low battery voltages
a device reset can not be guaranteed before supply voltage has dropped below minimum oper-
ating level. In order to ensure device operating limits are not violated it is therefore strongly
recommended to have the Brown-Out Detector enabled.
VCC
FDC = ON
FDC = OFF
FULL
DU
TY
C
YCL
E
VAR
IAB
LE
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