MC33910G5AC/MC3433910G5AC
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
input for the analog multiplexer. When used to sense voltage
outside the module, a 33 kohm series resistor must be used
on the input.
RESET PIN (RST)
This bidirectional pin is used to reset the MCU in case the
33910 detects a reset condition, or to inform the 33910 that
the MCU has just been reset. After release of the RST pin,
Normal Request mode is entered.
When used as wake-up input L1 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 input. If a state change is detected
between two cycles a wake-up is initiated. The 33910 can
also wake-up from Stop or Sleep by a simple state change on
L1.
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 VDD or
to GND during software development, without the risk of
destroying the driver.
When used as analog input, the voltage present on the L1
pin is scaled down by an selectable internal voltage divider
and can be routed to the ADOUT0 output through the analog
multiplexer.
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.
Note: If L1 input is selected in the analog multiplexer, it will
be disabled as digital input and remains disabled in low
power mode. No wake-up feature is available in that
condition.
When the L1 input is not selected in the analog
multiplexer, the voltage divider is disconnected from that
input.
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).
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.
GROUND CONNECTION PINS (AGND, PGND,
LGND)
HS1 and HS2 are controlled by SPI and can respond to a
signal applied to the PWMIN input pin.
The AGND, PGND and LGND pins are the Analog and
Power ground pins.
HS1 and HS2 outputs can also be used during low-power
mode for the cyclic-sense of the wake inputs.
The AGND pin is the ground reference of the voltage
regulator module.
POWER SUPPLY PINS (VS1 AND VS2)
The PGND and LGND pins are used for high current load
return as in the LIN interface pin.
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.
Note: PGND, AGND and LGND pins must be connected
together.
DIGITAL/ANALOG PIN (L1)
The high side switches (HS1 and HS2) are supplied by the
VS2 pin. All other internal blocks are supplied by the VS1 pin.
The L1 pin is multi purpose input. It can be used as a digital
input, which can be sampled by reading the SPI and used for
wake-up when 33910 is in low power mode or used as analog
33910
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
FREESCALE [ Freescale ]
