参数资料
型号: PCA9698BS,118
厂商: NXP Semiconductors
文件页数: 21/48页
文件大小: 0K
描述: IC I/O EXPANDER I2C 40B 56HVQFN
产品培训模块: I²C Bus Fundamentals
特色产品: NXP - I2C Interface
标准包装: 1
接口: I²C
输入/输出数: 40
中断输出:
频率 - 时钟: 1MHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 56-VFQFN 裸露焊盘
供应商设备封装: 56-HVQFN
包装: 标准包装
包括: POR
产品目录页面: 826 (CN2011-ZH PDF)
其它名称: 568-3240-6
28
7810C–AVR–10/12
Atmel ATmega328P [Preliminary]
Figure 8-2.
Crystal Oscillator Connections
The Low Power Oscillator can operate in three different modes, each optimized for a specific fre-
quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 8-3
Notes:
1. .This option should not be used with crystals, only with ceramic resonators.
2. If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
The CKSEL0 Fuse together with the SUT1..0 Fuses select the start-up times as shown in Table
Table 8-3.
Low Power Crystal Oscillator Operating Modes(2)
Frequency Range
(MHz)
Recommended Range for
Capacitors C1 and C2 (pF)
CKSEL3..1
0.4 - 0.9
0.9 - 3.0
12 - 22
101
3.0 - 8.0
12 - 22
110
8.0 - 16.0
12 - 22
111
Table 8-4.
Start-up Times for the Low Power Crystal Oscillator Clock Selection
Oscillator Source /
Power Conditions
Start-up Time from
Power-down and
Power-save
Additional Delay
from Reset
(VCC = 5.0V)
CKSEL0
SUT1..0
Ceramic resonator, fast
rising power
258 CK
14CK + 4.1 ms(1)
000
Ceramic resonator, slowly
rising power
258 CK
14CK + 65 ms(1)
001
Ceramic resonator, BOD
enabled
1K CK
14CK(2)
010
Ceramic resonator, fast
rising power
1K CK
14CK + 4.1 ms(2)
011
Ceramic resonator, slowly
rising power
1K CK
14CK + 65 ms(2)
100
XTAL2 (TOSC2)
XTAL1 (TOSC1)
GND
C2
C1
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