MC33912BAC Freescale Semiconductor, MC33912BAC Datasheet - Page 71

• 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

ANALOG CIRCUITRY
operating conditions. A fully configurable window watchdog
circuit will reset the connected MCU in case of an overflow.
Two low power modes are available with several different
wake-up sources to reactivate the device. Four analog /
digital inputs can be sensed or used as the wake-up source.
The device is capable of sensing the supply voltage
(VSENSE), the internal chip temperature (CTEMP) as well as
the motor current using an external sense resistor.
HIGH SIDE DRIVERS
with PWM capability are provided to drive small loads such as
Status LED’s or small lamps. Both Drivers can be configured
for periodic sense during low power modes.
LOW SIDE DRIVERS
with PWM capability are provided to drive H-Bridge type
relays for power motor applications
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33912 is designed to operate under automotive
Two current and temperature protected High Side drivers
Two current and temperature protected Low Side drivers
MC33912 - Functional Block Diagram
LIN Interface / Control
MCU Interface and Output Control
Integrated Supply
Analog Circuitry
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
SPI Interface
Figure 37. Functional Internal Block Diagram
Integrated Supply
Analog Circuitry
Analog Output 0/1
LS/HS - PWM Control
Reset & IRQ Logic
MCU INTERFACE
through a standard 8-Bit SPI interface. Critical system events
such as Low- or High-voltage/Temperature conditions as well
as over-current conditions in any of the driver stages can be
reported to the connected MCU via IRQ or RST. Both Low
Side and both High Side driver outputs can be controlled via
the SPI register as well as the PWMIN input. The integrated
LIN physical layer interface can be configured via SPI register
and its communication is driven through the RXD and TXD
device pins. All internal analog sources are multiplexed to the
A
routed through ADOUT1.
VOLTAGE REGULATOR OUTPUTS
the 33912. The VDD main regulator output is designed to
supply a MCU with a precise 5.0 V. The switchable HVDD
output is dedicated to supply small peripherals as hall
sensors.
LIN PHYSICAL LAYER INTERFACE
layer interface with selectable slew rate and various
diagnostic features.
DOUT
The 33912 is providing its control and status information
Two independent voltage regulators are implemented on
The 33912 provides a LIN 2.0 compatible LIN physical
MCU Interface and Output Control
Drivers
0 pin. The current sense analog signal is directly
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
High Side Drivers
LIN Physical Layer
Low Side Drivers
HS1 - HS2
LS1 - LS2
Interface
FUNCTIONAL DESCRIPTION
33912
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