参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 28/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
7.3.1.2
Oscillator Specifications
The crystal oscillator has been optimized for use in conjunction with the Micro Crystal CC7V-T1A32.768 kHz-9.0 pF-30 ppm or
equivalent (such as Micro Crystal CC5V-T1A or Epson FC135) and is capable of handling its parametric variations. Ensure that
the chosen crystal has a typical drive level of 0.5 μW or above to ensure proper operation of the crystal oscillator. Using a crystal
with a lower drive level can cause overtone oscillations.
The electrical characteristics of the 32 kHz Crystal oscillator are given in the following table, taking into account the crystal
characteristics noted above. The oscillator accuracy depends largely on the temperature characteristics of the crystal. Application
circuits can be optimized for required accuracy by adapting the external crystal oscillator network (via component accuracy and/
or tuning). Additionally, a clock calibration system is provided to adjust the 32.768 cycle counter that generates the 1.0 Hz timer
and RTC registers; see SRTC Support for more detail.
Table 15. Oscillator and Clock Main Electrical Specifications
Characteristics noted under conditions BP = 3.6 V, V BUS = 5.0 V, - 40 ? C ? T A ? 85 ? C, unless otherwise noted. Typical values
at BP = 3.6 V and T A = 25 °C under nominal conditions, unless otherwise noted.
Symbol
Characteristic
Min
Typ
Max
Unit
Notes
OSCILLATOR AND CLOCK OUTPUT
V INRTC
Operating Voltage
V
I INRTC
? Oscillator and RTC Block from BP
? Oscillator and RTC Block from LICELL
Operating Current Crystal Oscillator and RTC Module
? All blocks disabled, no main battery attached, coin cell is attached
1.8
1.8
-
-
-
2.0
4.5
3.6
5.0
? A
to LICELL
t START-RTC
RTC oscillator startup time
sec
V RTCLO
? Upon application of power
Output Low
? CLK32K Output sink 100 ? A
-
0.0
-
-
1.0
0.2
V
? CLK32KMCU Output source 50 ? A
V RTCHI
Output High
V
t CLK32KET
t CKL32K
? CLK32K Output source 100 ? A ?
?
? CLK32KMCU Output sink 50 ? A
CLK32K Rise and Fall Time, CL = 50 pF
? CLK32KDRV [1:0] = 00
? CLK32KDRV [1:0] = 01 (default)
? CLK32KDRV [1:0] = 10
? CLK32KDRV [1:0] = 11
CLK32KMCU Rise and Fall Time
CLK32K
VCC -0.2
VSRTC-0.2
-
-
-
-
-
-
6.0
2.5
3.0
2.0
CLK32K
VCC
VSRTC
-
-
-
-
ns
ns
MCUET
? CL = 12 pF
-
22
-
MCU DC
CLK32K DC/ CLK32K and CLK32KMCU Output Duty Cycle
CLK32K
? Crystal on XTAL1, XTAL2 pins
45
-
55
%
RMS Output Jitter
ns
? 1 Sigma for Gaussian distribution
-
-
30
RMS
MC34708
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
28
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