MC33912BAC Freescale Semiconductor, MC33912BAC Datasheet - Page 68

• Manufacturer Part Number: MC33912BAC
• Description: IC SYSTEM BASIS CHIP 32LQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC33912BAC

• Applications: System Basis Chip
• Current - Supply: 4.5mA
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

integrated and cost-effective solution for automotive and
industrial applications. For automotive body electronics, the
33912 is well suited to perform relay control in applications
like window lift, sunroof, etc. via LIN bus.
high side and low side outputs. Other ports are also provided,
graphic representation of the various pins referred to in the
following paragraphs. Also, see the pin diagram on page
for a description of the pin locations in the package.
RECEIVER OUTPUT PIN (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 PIN (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 PIN (LIN)
receiver. It is suited for automotive bus systems and is
compliant to the LIN bus specification 2.0.
Request modes.
SERIAL DATA CLOCK PIN (SCLK)
changes on the negative transition of the SCLK. MOSI is
sampled on the positive edge of the SCLK.
MASTER OUT SLAVE IN PIN (MOSI)
data input is sampled on the positive edge of SCLK.
68
33912
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33912 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
Figure 1, 33912 Simplified Application
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
Diagram, for a
INTRODUCTION
50
which include a current and voltage sense port, a Hall Sensor
port supply, and four 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.
MASTER IN SLAVE OUT PIN (MISO)
digital tri-state output used to shift serial data to the
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 PIN (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 for the 33912.
ANALOG MULTIPLEXER PIN (ADOUT0)
the MCU A/D converter to read the several inputs of the
Analog Multiplexer, including the VSENSE, L1, L2, L3, L4
input voltages, and the internal junction temperature.
CURRENT SENSE AMPLIFIER PIN (ADOUT1)
converter. It allows the MCU to read the output of the current
sense amplifier.
PWM INPUT CONTROL PIN (PWMIN)
drivers in Normal Request- and Normal mode.
operation to the High Side Control Register (HSCR) or the
Low Side Control Register (LSCR).
Also included in this device is a LIN physical layer, which
The MISO pin sends data to an SPI-enabled MCU. It is a
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
The ADOUT1 pin is an analog interface to the MCU A/D
This digital input can control the high sides and low sides
To enable PWM control, the MCU must perform a write
This pin has an internal 20 μA current pull-up.
Analog Integrated Circuit Device Data
Freescale Semiconductor