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| 型号： | MC33912BACR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 27/95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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MC33912G5AC / MC34912G5AC
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
INTRODUCTION
The 33912 offers three main operating modes: Normal (Run),
Stop, and Sleep (Low Power). In Normal mode, the device is
active and is operating under normal application conditions.
The Stop and Sleep modes are low power modes with wake-
up capabilities.
In Stop mode, the voltage regulator still supplies the MCU
with V DD (limited current capability), while in Sleep mode the
voltage regulator is turned off (V DD = 0 V).
Wake-up from Stop mode is initiated by a wake-up interrupt.
Wake-up from Sleep mode is done by a reset and the voltage
regulator is turned back on.
The selection of the different modes is controlled by the
MOD1:2 bits in the Mode Control Register (MCR).
Figure 14 describes how transitions are done between the
different operating modes. Table 6 , 29 , gives an overview of
the operating modes.
RESET MODE
The 33912 enters the Reset mode after a power up. In this
mode, the RST pin is low for 1.0 ms (typical value). After this
delay, it enters the Normal Request mode and the RST pin is
driven high.
The Reset mode is entered if a reset condition occurs (V DD
low, watchdog trigger fail, after wake-up from Sleep mode,
Normal Request mode timeout occurs).
NORMAL REQUEST MODE
This is a temporary mode automatically accessed by the
device after the Reset mode, or after a wake-up from Stop
mode.
In Normal Request mode, the VDD regulator is ON, the
RESET pin is High, and the LIN is operating in RX Only
mode.
As soon as the device enters in the Normal Request mode an
internal timer is started for 150 ms (typical value). During
these 150 ms, the MCU must configure the Timing Control
Register (TIMCR) and the Mode Control Register (MCR) with
MOD2 and MOD1 bits set = 0, to enter the Normal mode. If
within the 150 ms timeout, the MCU does not command the
33912 to Normal mode, it will enter in Reset mode. If the
WDCONF pin is grounded in order to disable the watchdog
function, it goes directly in Normal mode after the Reset
mode.
NORMAL MODE
In Normal mode, all 33912 functions are active and can be
The VDD regulator is ON and delivers its full current
capability.
If an external resistor is connected between the WDCONF
pin and the Ground, the window watchdog function will be
enabled.
The wake-up inputs (L1-L4) can be read as digital inputs or
have its voltage routed through the analog-multiplexer.
The LIN interface has slew rate and timing compatible with
the LIN protocol specification 2.0, 2.1 and SAEJ2602. The
LIN bus can transmit and receive information.
The high side and low side switches are active and have
PWM capability according to the SPI configuration.
The interrupts are generated to report failures for V SUP over/
under-voltage, thermal shutdown, or thermal shutdown
prewarning on the main regulator.
SLEEP MODE
The Sleep mode is a low power mode. From Normal mode,
the device enters into Sleep mode by sending one SPI
command through the Mode Control Register (MCR), or (V DD
low > 150 ms) with V SUV = 0. When in Reset mode, a V DD
under-voltage condition with no V SUP undervoltage (V SUV =
0) will send the device to Sleep mode. All blocks are in their
lowest power consumption condition. Only some wake-up
sources (wake-up inputs with or without cyclic sense, forced
wake-up and LIN receiver) are active. The 5.0 V regulator is
OFF. The internal low-power oscillator may be active if the IC
is configured for cyclic-sense. In this condition, one of the
high side switches is turned on periodically and the wake-up
inputs are sampled.
Wake-up from Sleep mode is similar to a power-up. The
device goes in Reset mode except that the SPI will report the
wake-up source and the BATFAIL flag is not set.
STOP MODE
The Stop mode is the second low power mode, but in this
case the 5.0 V regulator is ON with limited current drive
capability. The application MCU is always supplied while the
33912 is operating in Stop mode.
The device can enter into Stop mode only by sending the SPI
command. When the application is in this mode, it can wake-
up from the 33912 side (for example: cyclic sense, force
wake-up, LIN bus, wake inputs) or the MCU side (CS, RST
pins). Wake-up from Stop mode will transition the 33912 to
Normal Request mode and generates an interrupt except if
the wake-up event is a low to high transition on the CS pin or
comes from the RST pin.
controlled by the SPI interface and the PWMIN pin.
33912
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
27
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