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参数资料
| 型号： | MC33911BAC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 73/92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 |
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MC33911BAC / MC34911BAC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
RESET
To reset an MCU, the 33911 drives the RST pin low for the
time the reset condition lasts.
After the reset source has been removed, the state machine
will drive the RST output low for at least 1ms (typical value)
before driving it high.
In the 33911 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 33911 will issue a reset. In case of an 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 33911 will detect an MCU software run-
away and will reset the microcontroller.
Wake-Up From Sleep Mode
During Sleep mode, the 5.0 V regulator is not active. Hence,
all wake-up requests from Sleep mode require a power-up/
reset sequence.
External Reset
The 33911 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-L2) with cyclic sense
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 inputs state are 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-L2) with cyclic sense
timer enabled
The SBCLIN can wake-up at the end of a cyclic sense period
if on one of the two wake-up input lines (L1-L2), a state
change occurs. The HS1 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 HS1.
? In TIMCR: select the CS/WD bit and determine the
cyclic sense period with CYSTx bits.
? Perform Go to Sleep/Stop command.
Forced Wake-up
The 33911 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: the HS1 bit 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 the SPI.
LIN Wake-up
While in the low-power mode the 33911 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.
disabled
The wake-up lines are dedicated to sense state changes of
external switches, and wake-up the MCU (in Sleep or Stop
mode).
33911
Analog Integrated Circuit Device Data ?
73
Freescale Semiconductor
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相关代理商/技术参数 |
参数描述 |
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| MC33911BACR2 | 功能描述:LIN 收发器 SBC LIN2G MEDIUM 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 |
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| MC33911G5ACR2 | 功能描述:LIN 收发器 SBC LIN 2.5G Medium 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 |
| MC33912BAC | 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 |
| 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 |
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