参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 29/159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
7.3.2
SRTC Support
When configured for DRM mode (SPI bit DRM = 1), the CLK32KMCU driver will be kept enabled through all operational states
to ensure the SRTC module always has its reference clock. If DRM = 0, the CLK32KMCU driver will not be maintained in the Off
state.
It is also necessary to provide a means for the processor to do an RTC initiated wake-up of the system if it has been programmed
for such capability. This can be accomplished by connecting an open drain NMOS driver to the PWRON pin of the MC34708
PMIC, so it is in effect, a parallel path for the power key. The MC34708 PMIC will not be able to discern the turn on event from
a normal power key initiated turn on, but the processor should have the knowledge, since the RTC initiated turn on is generated
locally.
Open Drain output for RTC wake-up
34708
Processor
I/O
SPIVCC=1.8 V
32 kHz
Core Supply
SOG Supply
GP Domain=1.1 V
LP Dominant=1.2 V
V COREDIG
On
VCOREDIG
PWRONx
Detect
SRTC
HP-RC
Best of
Supply
On/Off
Button
32 kHz for
DSM timing
LP-RTC
VSRTC=1.2 V
CKIL: VSRTC
0.1 ? F
V SRTC &
Detect
CLK32KMCU
Coin Cell +
Battery -
+ Main
- Battery
Figure 5. SRTC Block Diagram
7.3.2.1
VSRTC
The VSRTC regulator provides the CLK32KMCU output level. Additionally, it is used to bias the Low Power SRTC domain of the
SRTC module integrated on certain FSL processors. The VSRTC regulator is enabled as soon as the RTCPORB is detected.
The VSRTC regulator cannot be disabled.
Depending on the configuration of the PUMS[4:0] pins, the VSRTC voltage will be set to 1.3 or 1.2 V. With PUMS[4:0] = (0110,
0111, 1000, or 1001) VSRTC will be set to 1.3 V in ON mode (ON, ON Standby and ON Standby Low Power modes). In OFF
and Coin Cell modes the VSRTC voltage will drop to 1.2 V with the PUMS[4:0] = (0110, 0111, 1000, or 1001). With PUMS[4:0]
≠ (0110, 0111, 1000, or 1001), VSRTC will be set to 1.2 V for all modes (ON, ON Standby, LPM ON Standby, OFF, and Coin Cell).
Table 16. VSRTC 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
GENERAL
V SRTCIN
Operating Input Voltage Range V INMIN to V INMAX
V
? Valid Coin Cell range
? Valid BP
1.8
1.8
-
-
3.6
4.5
I SRTC
CO SRTC
Operating Current Load Range IL MIN to IL MAX
Bypass Capacitor Value
0.0
-
-
0.1
50
-
? A
? F
MC34708
Analog Integrated Circuit Device Data ?
29
Freescale Semiconductor
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