- 您现在的位置：买卖IC网 > PDF目录16630 > MC33912BAC (Freescale Semiconductor)IC SYSTEM BASIS CHIP 32LQFP PDF资料下载
参数资料
| 型号： | MC33912BAC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 75/95页 |
| 文件大小： | 0K |
| 描述： | IC SYSTEM BASIS CHIP 32LQFP |
| 标准包装： | 250 |
| 应用： | 系统基础芯片 |
| 电流 - 电源： | 4.5mA |
| 电源电压： | 5.5 V ~ 27 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 托盘 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页当前第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页
MC33912BAC / MC34912BAC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
After the reset source is removed, the state machine will drive
the RST output low for at least 1.0 ms (typical value) before
driving it high.
In the 33912, four main reset sources exist:
5.0 V Regulator Low-voltage-Reset (V RSTTH )
The 5.0 V regulator output V DD is continuously monitored
against brown outs. If the supply monitor detects that the
voltage at the VDD pin has dropped below the reset threshold
V RSTTH the 33912 will issue a reset. In case of over-
temperature, the voltage regulator will be disabled and the
voltage monitoring will issue a VDDOT Flag independently of
the V DD voltage.
Window Watchdog Overflow
If the watchdog counter is not properly serviced while its
window is open, the 33912 will detect an MCU software run-
away and will reset the microcontroller.
Wake-up From Sleep Mode
During Sleep mode, the 5V regulator is not active, hence all
wake-up requests from Sleep mode require a power-up/reset
sequence.
External Reset
The 33912 has a bidirectional reset pin which drives the
device to a safe state (same as Reset mode) for as long as
this pin is held low. The RST pin must be held low long
enough to pass the internal glitch filter and get recognized by
the internal reset circuit. This functionality is also active in
Stop mode.
After the RST pin is released, there is no extra t RST to be
considered.
WAKE-UP CAPABILITIES
Once entered into one of the low-power modes (Sleep or
Stop) only wake-up sources can bring the device into Normal
mode operation.
In Stop mode, a wake-up is signaled to the MCU as an
interrupt, while in Sleep mode the wake-up is performed by
activating the 5.0 V regulator and resetting the MCU. In both
cases the MCU can detect the wake-up source by accessing
the SPI registers. There is no specific SPI register bit to signal
a CS wake-up or external reset. If necessary this condition is
detected by excluding all other possible wake-up sources.
Wake-up from Wake-up inputs (L1-L4) with cyclic sense
disabled
The wake-up lines are dedicated to sense state changes of
external switches and wake-up the MCU (in Sleep or Stop
In order to select and activate direct wake-up from Lx inputs,
the Wake-up Control Register (WUCR) must be configured
with appropriate LxWE inputs enabled or disabled. The
wake-up input’s state is read through the Wake-up Status
Register (WUSR).
Lx inputs are also used to perform cyclic-sense wake-up.
Note: Selecting an Lx input in the analog multiplexer before
entering low power mode will disable the wake-up capability
of the Lx input
Wake-up from Wake-up inputs (L1-L4) with cyclic sense
timer enabled
The SBCLIN can wake-up at the end of a cyclic sense period
if on one of the four wake-up input lines (L1-L4) a state
change occurs. The HSx switch is activated in Sleep or Stop
modes from an internal timer. Cyclic sense and force wake-
up are exclusive. If cyclic sense is enabled, the force wake-
up can not be enabled.
In order to select and activate the cyclic sense wake-up from
Lx inputs, before entering in low power modes (Stop or Sleep
modes), the following SPI set-up has to be performed:
In WUCR: select the Lx input to WU-enable.
In HSCR: enable the desired HSx.
? In TIMCR: select the CS/WD bit and determine the
cyclic sense period with CYSTx bits.
? Perform Goto Sleep/Stop command.
Forced Wake-up
The 33912 can wake-up automatically after a predetermined
time spent in Sleep or Stop mode. Cyclic sense and Forced
wake-up are exclusive. If Forced wake-up is enabled, the
Cyclic Sense can not be enabled.
To determine the wake-up period, the following SPI set-up
has to be sent before entering in low power modes:
? In TIMCR: select the CS/WD bit and determine the low
power mode period with CYSTx bits.
? In HSCR: all HSx bits must be disabled.
CS Wake-up
While in Stop mode, a rising edge on the CS will cause a
wake-up. The CS wake-up does not generate an interrupt,
and is not reported on SPI.
LIN Wake-up
While in the low-power mode, the 33912 monitors the activity
on the LIN bus. A dominant pulse larger than t PROPWL
followed by a dominant to recessive transition will cause a
LIN wake-up. This behavior protects the system from a short
to ground bus condition.
mode).
33912
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
75
相关PDF资料 |
PDF描述 |
|---|---|
| EEC26DREI-S734 | CONN EDGECARD 52POS .100 EYELET |
| H3DKH-1406M | IDC CABLE - HKR14H/AE14M/HPK14H |
| EMC08DREH-S734 | CONN EDGECARD 16POS .100 EYELET |
| EEC13DREF-S734 | CONN EDGECARD 26POS .100 EYELET |
| EBC15DRAN-S734 | CONN EDGECARD 30POS .100 R/A PCB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33912BACR2 | 功能描述:LIN 收发器 SBC LIN2G - HI END RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MC33912G5AC | 功能描述:LIN 收发器 SBC LIN 2.5G RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MC33912G5ACR2 | 功能描述:LIN 收发器 SBC LIN 2.5G RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MC33916 | 制造商:PRIVATE LABEL 功能描述:DC Brushless Fan, 70x70x25mm, 12VDC Ball |
| MC33919 | 制造商:PRIVATE LABEL 功能描述:FAN |
发布紧急采购，3分钟左右您将得到回复。