MC33912BAC Freescale Semiconductor, MC33912BAC Datasheet - Page 25

• 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

RESET PIN (RST)
33912 detects a reset condition, or to inform the 33912 that
the MCU has just been 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.
INTERRUPT PIN (IRQ)
faults to the MCU while in Normal and Normal Request mode
or to signal a wake-up from Stop mode. This active low output
will transition to high only after the interrupt is acknowledged
by a SPI read of the respective status bits.
WATCHDOG CONFIGURATION PIN (WDCONF)
watchdog. A resistor can be connected to this pin to configure
the window watchdog period. When connected directly to
ground, the watchdog will be disabled. When this pin is left
open, the watchdog period is fixed to its lower precision
internal default value (150 ms typical).
GROUND CONNECTION PINS (AGND, PGND,
LGND)
Power ground pins.
regulator and the current sense module.
return as in the relay-drivers and LIN interface pin.
together.
CURRENT SENSE AMPLIFIER INPUT PINS
(ISENSEH AND ISENSEL)
ground compatible differential amplifier designed to be used
to sense the voltage drop over a shunt resistor. The main
purpose of this amplifier is to implement accurate current
sensors. The gain of the differential amplifier can be set by
SPI.
LOW SIDE PINS (LS1 AND LS2)
outputs are short-circuit protected and include active clamp
circuitry to drive inductive loads. Due to the energy clamp
voltage on this pin, it can raise above the battery level when
switched off. The switches are controlled through the SPI and
Analog Integrated Circuit Device Data
Freescale Semiconductor
This bidirectional pin is used to reset the MCU in case the
The RST pin is an active low filtered input and output
The IRQ pin is a digital output used to signal events or
The WDCONF pin is the configuration pin for the internal
The AGND, PGND and LGND pins are the Analog and
The AGND pin is the ground reference of the voltage
The PGND and LGND pins are used for high current load
Note: PGND, AGND and LGND pins must be connected
The ISENSEH and ISENSEL pins are the input pins of a
LS1 and LS2 are the low side driver outputs. Those
DD
or
can be configured to respond to a signal applied to the
PWMIN input pin.
In case of VS1 disconnection and the low sides are still
supplied by V
VDS voltage equal to the clamping value, as stated in the
specification.
DIGITAL/ANALOG PINS (L1, L2, L3 AND L4)
digital inputs, which can be sampled by reading the SPI and
used for wake-up when 33912 is in low power mode or used
as analog inputs for the analog multiplexer. When used to
sense voltage outside the module, a 33 kohm series resistor
must be used on each input.
operate in cyclic-sense mode. In this mode one or both of the
high side switches are configured to be periodically turned on
and sample the wake-up inputs. If a state change is detected
between two cycles a wake-up is initiated. The 33912 can
also wake-up from Stop or Sleep by a simple state change on
L1-L4.
pins is scaled down by an selectable internal voltage divider
and can be routed to the ADOUT0 output through the analog
multiplexer.
will be disabled as a digital input and remains disabled in low
power mode. No wake-up feature is available in that
condition.
the voltage divider is disconnected from that input.
HIGH SIDE OUTPUT PINS (HS1 AND HS2)
as relays or lamps. Their structures are connected to the VS2
supply pin. The pins are short-circuit protected and both
outputs are also protected against overheating.
signal applied to the PWMIN input pin.
mode for the cyclic-sense of the wake inputs.
POWER SUPPLY PINS (VS1 AND VS2)
application, VS1 and VS2 pins must be protected against
reverse battery connection and negative transient voltages
with external components. These pins sustain standard
automotive voltage conditions such as a load dump at 40 V.
VS2 pin. All other internal blocks are supplied by the VS1 pin.
Both low side switches are protected against overheating.
The Lx pins are multi purpose inputs. They can be used as
When used as wake-up inputs L1-L4 can be configured to
When used as analog inputs, the voltage present on the Lx
Note: If an Lx input is selected in the analog multiplexer, it
When an Lx input is not selected in the analog multiplexer,
These two high side switches are able to drive loads such
HS1 and HS2 are controlled by SPI and can respond to a
HS1 and HS2 outputs can also be used during low-power
Those are the battery level voltage supply pins. In an
The high side switches (HS1 and HS2) are supplied by the
BAT
through a load, both low sides will have a
FUNCTIONAL PIN DESCRIPTION
FUNCTIONAL DESCRIPTION
33912
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