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參數(shù)資料
| 型號(hào)： | MD80C32-30 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁(yè)數(shù)： | 151/210頁(yè) |
| 文件大小： | 5175K |
| 代理商： | MD80C32-30 |
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45
8048C–AVR–02/12
ATtiny43U
8.6.6
Summary
The table below summarises recommended component values for a typical application.
Note:
1. With these values the LPF provides a 32dB attenuation at the switching frequency of the boost
converter while permitting a supply voltage ripple of about ±200mV
2. Application specific limits may be tighter
3. With above 1k
Ω values the V
START level increases. Also, the resistor divider value in
V
BAT channel of the ADC is affected.
8.7
Characteristics
Electrical characteristics of the boost converter are given in Table 20-7 on page 162. Typical
characteristics can be found under section “Boost Converter” on page 168.
8.8
Potential Limitations
When the device is powered via the boost converter some usage limitiations may apply. For
example, the highest allowed operating frequency of the device depends on supply voltage (see
“Speed” on page 159) and the boost converter output voltage varies within the limits given in
Table 20-7 on page 162. This means that if the design allows the boost converter to go into
Active Low Current Mode the supply voltage will drop periodically, affecting the maximum
allowed operating frequency.
Provided the load current remains sufficiently high the boost converter will never enter Active
Low Current Mode and the supply voltage will remain high enough to run the device at higher
frequencies. The boost converter status bit BS can be used to determine if the boost converter is
in Low Current Mode (see “ADCSRB – ADC Control and Status Register B” on page 48).
Since the entire device is powered from the boost converter output variations will show in all
peripherals. This means that, for example, high levels of I/O pins may vary with supply voltage.
8.9
Bypassing the Boost Converter
It is possible to bypass and disable the boost converter so that the device can be powered
directly from an external supply. To force the boost converter into Stop Mode, connect pin V
BAT
to ground and provide the device with supply directly to the V
CC pin. To permanently disable the
boost converter, connect pins V
BAT and LSW to ground and provide the device with supply
directly to the V
CC pin.
Table 8-1.
Boost Converter Component Values
Component
Recommended Value
Min(2)
C
1
C = 4.7 F
1 F
C2
C = 100 nF (1)
1 F
C3
C = 22 F, ESR < 100 m
Ω
10 F
C
4
C = 100 nF
D1
IR = 10 A @ 25°C, VF = 0.35V @ 0.5A
L1
L = 15 H ±20%, IMAX > 500 mA, IRMS > 250 mA, R < 500 mΩ
10 H
15 H
R
1
R = 680
Ω (1)
22 k
Ω (3)
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