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参数资料
| 型号： | ISD4003-05MSI |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 音频合成 |
| 英文描述： | 300 SEC, SPEECH SYNTHESIZER WITH RCDG, PDSO28 |
| 封装： | 0.1200 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 26/37页 |
| 文件大小： | 392K |
| 代理商： | ISD4003-05MSI |
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32
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
The capacitance (Ce + Ci) needed at each TOSC pin can be calculated by using:
where:
Ce - is optional external capacitors as described in Figure 9-2 on page 30
Ci - is the pin capacitance in Table 9-9 on page 32
CL - is the load capacitance for a 32.768kHz XTAL specified by the XTAL vendor.
C
S - is the total stray capacitance for one TOSC pin.
XTALs specifying load capacitance (CL) higher than the ones given in the Table 9-9 on page 32, require external
capacitors applied as described in Figure 9-2 on page 30.
The low-frequency XTAL Oscillator must be selected by setting the CKSEL Fuses to “0110” or “0111” as shown in
Table 9-11. Start-up times are determined by the SUT Fuses as shown in Table 9-10.
Note:
1. This option should only be used if frequency stability at start-up is not important for the application.
9.7
External clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 9-3 on page 33. To
run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Table 9-9.
Capacitance for low-frequency XTAL oscillator.
Device
32kHz osc. type
Cap (Xtal1/Tosc1)
Cap (Xtal2/Tosc2)
Atmel
ATmega165A/PA/325A/PA/3250A/PA/645
A/P/6450A/P
System osc.
16pF
6pF
Timer osc.
16pF
6pF
Table 9-10.
Start-up times for the low-frequency XTAL oscillator clock selection.
SUT1..0
Additional delay from reset (V
CC = 5.0V)
Recommended usage
00
14 CK
Fast rising power or BOD enabled
01
14 CK + 4ms
Slowly rising power
10
14 CK + 65ms
Stable frequency at start-up
11
Reserved
Table 9-11.
Start-up times for the low-frequency XTAL oscillator clock selection.
CKSEL3...0
Start-up time from power-down and power-save
Recommended usage
0110 (1)
1K CK
0111
32K CK
Stable frequency at start-up
Ce
Ci
+
2 CL
C
s
–
=
相关PDF资料 |
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| ISD4003-06MED | 360 SEC, SPEECH SYNTHESIZER WITH RCDG, PDSO28 |
| ISD4003-06MEI | 360 SEC, SPEECH SYNTHESIZER WITH RCDG, PDSO28 |
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