mc33911 Freescale Semiconductor, Inc, mc33911 Datasheet - Page 23

• Manufacturer Part Number: mc33911
• Description: Mc33911 Lin System Basis Chip With Dc Motor Pre-driver
• Manufacturer: Freescale Semiconductor, Inc

INTRODUCTION
(Run), Stop, and Sleep (Low-power). In Normal Mode, the
device is active and operating under normal application
conditions. The Stop and Sleep Modes are low-power modes
with wake-up capabilities.
with V
voltage regulator is turned off (V
interrupt. Wake-up from Sleep Mode is done by a reset and
the voltage regulator is turned back on.
MOD1:2 bits in the Mode Control Register (MCR).
different operating modes, and
overview of the operating modes.
RESET MODE
mode, the RST pin is low for 1ms (typical value). After this
delay, the 33911 enters the Normal Request Mode and the
RST pin is driven high.
low, Watchdog trigger fail, after a wake-up from Sleep Mode,
or a Normal Request Mode timeout).
NORMAL REQUEST MODE
device after the Reset Mode, or after a wake-up from Stop
Mode.
Reset pin is high and the LIN is operating in RX Only Mode.
an internal timer is started for 150ms (typical value). During
these 150ms, the MCU must configure the Timing Control
Register (TIMCR) and the MCR with MOD2 and MOD1 bits
set = 0, to enter in Normal Mode. If within the 150ms timeout
the MCU does not command the 33911 to Normal Mode, it
will enter in Reset Mode. If the WDCONF pin is grounded in
order to disable the watchdog function, the 33911 goes
directly in Normal Mode after the Reset Mode. If the
WDCONF pin is open, the 33911 stays typically for 150ms in
Normal Request before entering in Normal Mode.
NORMAL MODE
controlled by the SPI interface and the PWMIN pin.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33911 offers three main operating modes: Normal
In Stop Mode, the voltage regulator still supplies the MCU
Wake-up from Stop Mode is initiated by a wake-up
The selection of the different modes is controlled by the
Figure 15
The 33911 enters the Reset Mode after a power up. In this
The Reset Mode is entered if a reset condition occurs (V
This is a temporary mode automatically accessed by the
In Normal Request Mode, the VDD regulator is ON, the
As soon as the device enters the Normal Request Mode,
In Normal Mode, all 33911 functions are active and can be
DD
(limited current capability), and in Sleep Mode the
describes how transitions are done between the
Table
DD
= 0V).
FUNCTIONAL DEVICE OPERATIONS
5, 25, gives an
OPERATIONAL MODES
DD
capability.
pin and the Ground, the window watchdog function will be
enabled.
inputs or have its voltage routed through the analog
multiplexer.
the LIN protocol specification 2.0. The LIN bus can transmit
and receive information.
have PWM capability according to the SPI configuration.
over/under-voltage, thermal shutdown or thermal shutdown
prewarning on the main regulator.
SLEEP MODE
Mode, the device enters the Sleep Mode by sending one SPI
command through the MCR. 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 5V regulator is OFF. The
internal low-power oscillator may be active if the IC is
configured for cyclic sense. In this condition, the high side
switches are turned on periodically and the wake-up inputs
are sampled.
device goes into Reset Mode except that the SPI will report
the wake-up source, and the BATFAIL flag is not set.
STOP MODE
case the 5V regulator is ON with limited current drive
capability. The application MCU is always supplied while the
33911 is operating in Stop Mode.
command. When the application is in this mode, it can wake-
up from the 33911 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 33911 to
Normal Request Mode and generate an interrupt, except if
the wake-up event is a low to high transition on the CS pin or
comes from the RST pin.
The VDD regulator is ON and delivers its full current
If an external resistor is connected between the WDCONF
The wake-up inputs (L1 and L2) can be read as digital
The LIN interface has slew rate and timing compatible with
The high side and the low side switches are active and
The interrupts are generated to report failures for V
The Sleep Mode is a low-power mode. From Normal
Wake-up from Sleep Mode is similar to a power-up. The
The Stop Mode is the second low-power mode, but in this
The device can enter the Stop Mode only by sending a SPI
FUNCTIONAL DEVICE OPERATIONS
OPERATIONAL MODES
SUP
33911
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