mc33911 Freescale Semiconductor, Inc, mc33911 Datasheet - Page 20

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

integrated and cost-effective solution for automotive and
industrial applications. For automotive body electronics, the
33911 is well suited to perform relay control in applications
like window lift, sunroof, etc. via a LIN bus.
high side and low side outputs. Other ports are also provided,
page 1, for a graphic representation of the various pins
referred to in the following paragraphs. Also, see the pin
diagram on page
package.
RECEIVER OUTPUT (RXD)
the LIN interface and reports the state of the bus voltage:
RXD Low when LIN bus is dominant, RXD High when LIN bus
is recessive.
TRANSMITTER INPUT (TXD)
the LIN interface and controls the state of the bus output
(dominant when TXD is Low, recessive when TXD is High).
case the input is left floating.
LIN BUS (LIN)
receiver. It is suited for automotive bus systems and is
compliant to the LIN bus specification 2.0.
Request Modes.
SERIAL DATA CLOCK (SCLK)
changes on the negative transition of the SCLK. MOSI is
sampled on the positive edge of the SCLK.
MASTER OUT SLAVE IN (MOSI)
data input is sampled on the positive edge of SCLK.
MASTER IN SLAVE OUT (MISO)
digital tri-state output used to shift serial data to the
20
33911
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33911 was designed and developed as a highly
Power switches are provided on the device configured as
See
The RXD pin is a digital output. It is the receiver output of
The TXD pin is a digital input. It is the transmitter input of
This pin has an internal pull-up to force recessive state in
The LIN pin represents the single-wire bus transmitter and
The LIN interface is only active during Normal and Normal
The SCLK pin is the SPI clock input pin. MISO data
The MOSI digital pin receives SPI data from the MCU. This
The MISO pin sends data to a SPI-enabled MCU. It is a
Figure 1, 33911 Simplified Application
3
for a description of the pin locations in the
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
Diagram,
INTRODUCTION
which include a voltage sense port and two wake-up capable
pins. An internal voltage regulator provides power to a MCU
device.
communicates using a single wire. This enables this device
to be compatible with 3-wire bus systems, where one wire is
used for communication, one for battery, and one for ground.
microcontroller. Data on this output pin changes on the
negative edge of the SCLK. When CS is High, this pin will
remain in high-impedance state.
CHIP SELECT (CS)
a valid SPI communication and allow for several devices to
be connected in the same SPI bus without contention. A
rising edge on CS signals the end of the transmission and the
moment the data shifted in is latched. A valid transmission
must consist of 8 bits only.
pin will generate a wake-up condition.
ANALOG MULTIPLEXER (ADOUT0)
the MCU A/D converter to read the several inputs of the
Analog Multiplexer, including the VSENSE, L1, L2 input
voltages and the internal junction temperature.
PWM INPUT CONTROL (PWMIN)
drivers in Normal Request and Normal Mode.
operation to the High Side Control Register (HSCR), or the
Low Side Control Register (LSCR).
RESET (RST)
33911 detects a reset condition, or to inform the 33911 that
the MCU was just reset. After release of the RST pin Normal
Request Mode is entered.
formed by a weak pull-up and a switchable pull-down
structure, which allows this pin to be shorted either to V
to GND during software development without the risk of
destroying the driver.
Also included in this device is a LIN physical layer, which
CS is an active low digital input. It must remain low during
While in STOP Mode a low-to-high level transition on this
The ADOUT0 pin can be configured via the SPI to allow
This digital input can control the high side and low side
To enable PWM control, the MCU must perform a write
This pin has an internal 20µA current pull-up.
This bidirectional pin is used to reset the MCU in case the
The RST pin is an active low filtered input and output
Analog Integrated Circuit Device Data
Freescale Semiconductor
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