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| 型号： | MC33912BACR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 74/95页 |
| 文件大小： | 0K |
| 描述： | IC SYSTEM BASIS CHIP 32LQFP |
| 标准包装： | 2,000 |
| 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： | 带卷 (TR) |
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MC33912BAC / MC34912BAC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
Table 37. Operating Modes Overview
Function
Reset Mode Normal Request Mode
Normal
Mode
Stop Mode
Sleep Mode
SPI
VDD
HVDD
LSx
HSx
Analog Mux
Lx
Current Sense
Full
-
-
-
-
-
On
Full
SPI/PWM (129)
SPI/PWM (129)
SPI
Inputs
On
Full
SPI
SPI/PWM
SPI/PWM
SPI
Inputs
On
Stop
-
-
Note (130)
-
Wake-up
-
-
-
-
Note (131)
-
Wake-up
-
LIN
-
Rx-Only
Full/Rx-Only Rx-Only/Wake-up
Wake-up
Watchdog
VSENSE
-
On
150 ms (typ.) timeout
On
On (132) /Off
On
-
VDD
-
-
Notes
128.
129.
130.
131.
132.
INTERRUPTS
Operation can be enabled/controlled by the SPI.
Operation can be controlled by the PWMIN input.
HSx switches can be configured for cyclic sense operation in Stop mode.
HSx switches can be configured for cyclic sense operation in Sleep mode.
Windowing operation when enabled by an external resistor.
High-voltage Interrupt:
Interrupts are used to signal a microcontroller that a
peripheral needs to be serviced. The interrupts which can be
generated, change according to the operating mode. While in
Normal and Normal Request modes, the 33912 signals
through interrupts special conditions which may require a
MCU software action. Interrupts are not generated until all
pending wake-up sources are read in the Interrupt Source
Register (ISR).
While in Stop mode, interrupts are used to signal wake-up
events. Sleep mode does not use interrupts. Wake-up is
performed by powering-up the MCU. In Normal and Normal
Request mode the wake-up source can be read by SPI.
The interrupts are signaled to the MCU by a low logic level of
the IRQ pin, which will remain low unt il the interrupt is
acknowledged by a SPI read. The IRQ pin will then be driven
high.
Interrupts are only asserted while in Normal, Normal Request
and Stop mode. Interrupts are not generated while the RST
pin is low.
The following is a list of the interrupt sources in Normal and
Normal Request modes. Some of these can be masked by
writing to the SPI - Interrupt Mask Register (IMR).
Low-voltage Interrupt:
Signals when the supply line (VS1) voltage drops below the
VSUV threshold ( V SUV ).
Signals when the supply line (VS1) voltage increases above
the VSOV threshold ( V SOV ).
Over-temperature Prewarning:
Signals when the 33912 temperature has reached the pre-
shutdown warning threshold. It is used to warn the MCU that
an over-temperature shutdown in the main 5.0 V regulator is
imminent.
LIN Over-current Shutdown / Over-temperature
Shutdown / TXD Stuck At Dominant / RXD Short-circuit:
These signal fault conditions within the LIN interface will
cause the LIN driver to be disabled, except for the LIN over-
current condition. In order to restart operation, the fault must
be removed and must be acknowledged by reading the SPI.
The LINOC bit functionality in the LIN Status Register
(LINSR) is to indicate an LIN over-current has occurred and
the driver remains enabled.
High Side Over-temperature Shutdown:
Signals a shutdown in the high side outputs.
Low Side Over-temperature Shutdown:
Signals a shutdown in the low side outputs.
RESET
To reset a MCU the 33912 drives the RST pin low for the time
the reset condition lasts.
33912
Analog Integrated Circuit Device Data ?
74
Freescale Semiconductor
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