参数资料
型号: ADUC7033BSTZ-88-RL
厂商: Analog Devices Inc
文件页数: 66/140页
文件大小: 0K
描述: IC BATT SENSOR PREC 48LQFP
标准包装: 2,000
功能: 电池监控器
电源电压: 3.5 V ~ 18 V
工作温度: -40°C ~ 115°C
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 带卷 (TR)

ADuC7033
SYSTEM CLOCKS
The ADuC7033 integrates a very flexible clocking system that
can be clocked from one of three sources: an integrated on-chip
precision oscillator, an integrated on-chip low power oscillator,
or an external watch crystal. These three options are shown in
Each of the internal oscillators are divided by four to generate a
clock frequency of 32.768 kHz. The PLL locks onto a multiple
(625) of 32.768 kHz, supplied by either of the internal oscillators
or the external crystal, to provide a stable 20.48 MHz clock for
the system. The core can operate at this frequency, or at binary
submultiples of it, thereby allowing power saving when peak
performance is not required.
By default, the PLL is driven by the low power oscillator that
generates a 20.48 MHz clock source. The ARM7TDMI core is
driven by a CD divided clock derived from the output of the PLL.
By default, the CD divider is configured to divide the PLL
output by two, thereby generating a core clock of 10.24 MHz.
The divide factor can be modified to generate a binary weighted
divider factor from 1 to 128 that can be altered dynamically by
user code.
The ADC is driven by the output of the PLL, divided to give an
ADC clock source of 512 kHz. In low power mode, the ADC
clock source is switched from the standard 512 kHz to the low
power 131 kHz oscillator.
Note that the low power oscillator drives both the watchdog and
core wake-up timers through a divide-by-four circuit. A detailed
block diagram of the ADuC7033 clocking system is shown in
EXTERNAL CRYSTAL
(OPTIONAL)
PRECISION
131kHz
EXTERNAL
32.768kHz
HIGH ACCURCY
CALIBRATION
COUNTER
PRECISION
131kHz
CRYSTAL
CIRCUITRY
LOW POWER
131kHz
LOW POWER
OSCILLATOR
LOW POWER
CALIBRATION
COUNTER
EXTERNAL
32.768kHz
LOW POWER
OSCILLATOR
EXTERNAL
32.768kHz
PRECISION
OSCILLATOR
PRECISION
32.768kHz
LOW POWER
32.768kHz
PRECISION
32.768kHz
TIMER 0
LIFE TIME
LOW POWER
32.768kHz
DIV 4
DIV 4
CORE CLOCK
PLLCON
GPIO_5
PLL
ECLK 2.5MHz
GPIO_8
TIMER 1
CORE CLOCK
LOW POWER
32.768kHz
1
8
PLL OUTPUT
20.48MHz
CLOCK
DIVIDER
CORE CLOCK
EXTERNAL
PLL LOCK
ADCMDE
32.768kHz
PRECISION
TIMER 2
WAKE-UP
32.768kHz
FLASH
CONTROLLER
LOW POWER
32.768kHz
CORE
1
2 CD
ADC
LOW POWER
32.768kHz
WATCHDOG
TIMER 3
CLOCK
CLOCK
LOW POWER
32.768kHz
TIMER 4
MCU
ADC
CORE CLOCK
STI
LOW POWER
CORE CLOCK
32.768kHz
LIN H/W
PLL OUTPUT
SPI
CORE CLOCK
UART
PLL OUTPUT
SYNCHRONIZATION
(20.48MHz)
(5MHz)
Figure 29. ADuC7033 System Clock Generation
Rev. B | Page 66 of 140
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