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参数资料
| 型号： | MC33912BAC |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 25/95页 |
| 文件大小： | 0K |
| 描述： | IC SYSTEM BASIS CHIP 32LQFP |
| 标准包装： | 250 |
| 应用： | 系统基础芯片 |
| 电流 - 电源： | 4.5mA |
| 电源电压： | 5.5 V ~ 27 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 托盘 |
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MC33912G5AC / MC34912G5AC
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
RESET PIN (RST)
This bidirectional pin is used to reset the MCU in case the
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.
The RST pin is an active low filtered input and output formed
by a weak pull-up and a switchable pull-down structure which
allows this pin to be shorted either to V DD or to GND during
software development, without the risk of destroying the
driver.
INTERRUPT PIN (IRQ)
The IRQ pin is a digital output used to signal events or 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)
The WDCONF pin is the configuration pin for the internal
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)
The AGND, PGND and LGND pins are the Analog and Power
ground pins.
The AGND pin is the ground reference of the voltage
regulator and the current sense module.
The PGND and LGND pins are used for high current load
return as in the relay-drivers and LIN interface pin.
Note: PGND, AGND and LGND pins must be connected
together.
CURRENT SENSE AMPLIFIER INPUT PINS
(ISENSEH AND ISENSEL)
The ISENSEH and ISENSEL pins are the input pins of a
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)
LS1 and LS2 are the low side driver outputs. Those 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.
configured to respond to a signal applied to the PWMIN input
pin.
Both low side switches are protected against overheating. In
case of VS1 disconnection and the low sides are still supplied
by V BAT through a load, both low sides will have a VDS
voltage equal to the clamping value, as stated in the
specification.
DIGITAL/ANALOG PINS (L1, L2, L3 AND L4)
The Lx pins are multi purpose inputs. They can be used as
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.
When used as wake-up inputs L1-L4 can be configured to
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.
When used as analog inputs, the voltage present on the Lx
pins is scaled down by an selectable internal voltage divider
and can be routed to the ADOUT0 output through the analog
multiplexer.
Note: If an Lx input is selected in the analog multiplexer, it will
be disabled as a digital input and remains disabled in low
power mode. No wake-up feature is available in that
condition.
When an Lx input is not selected in the analog multiplexer,
the voltage divider is disconnected from that input.
HIGH SIDE OUTPUT PINS (HS1 AND HS2)
These two high side switches are able to drive loads such 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.
HS1 and HS2 are controlled by SPI and can respond to a
signal applied to the PWMIN input pin.
HS1 and HS2 outputs can also be used during low-power
mode for the cyclic-sense of the wake inputs.
POWER SUPPLY PINS (VS1 AND VS2)
Those are the battery level voltage supply pins. In an
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.
The high side switches (HS1 and HS2) are supplied by the
VS2 pin. All other internal blocks are supplied by the VS1 pin.
The switches are controlled through the SPI and can be
33912
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
25
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