MC35XS3400 Datasheet, PDF (18/45 Pages) Freescale Semiconductor, Inc – Quad High Side Switch (Quad 35mΩ)

FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
GROUND (GND)
These pins are the ground for the device.
POSITIVE POWER SUPPLY (VPWR)
This pin connects to the positive power supply and is the
source of operational power for the device. The VPWR
contact is the backside surface mount tab of the package.
SERIAL OUTPUT (SO)
The SO data pin is a tri-stateable output from the shift
register. The SO pin remains in a high-impedance state until
the CS pin is put into a logic [0] state. The SO data is capable
of reporting the status of the output, the device configuration,
the state of the key inputs, etc. The SO pin changes state on
the rising edge of SCLK and reads out on the falling edge of
SCLK. SO reporting descriptions are provided in Table 22,
page 32.
HIGH SIDE OUTPUTS (HS3, HS1, HS0, HS2)
Protected 35mΩ high side power outputs to the load.
FAIL-SAFE INPUT (FSI)
This pin incorporates an active internal pull-up current
source from internal supply (V_REG). This enables the
watchdog timeout feature.
When the FSI pin is opened, the watchdog circuit is
enabled. After a watchdog timeout occurs, the output states
depends on IN[0:3].
When the FSI pin is connected to GND, the watchdog
circuit is disabled. The output states depends on IN[0:3] in
case of V_DD failure condition, in case V_DD failure detection is
activated (VDD_FAIL_en bit sets to logic [1]).
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
POWER SUPPLY
MCU INTERFACE and
OUTPUT CONTROL
SPI INTERFACE
MCU
INTERFACE
PARALLEL CONTROL
INPUTS
PWM CONTROLLER
SELF-
PROTECTED
HIGH SIDE
SWITCHES
HS0-HS3
POWER SUPPLY
The 35XS3400 is designed to operate from 4.0V to 28V on
the VPWR pin. Characteristics are provided from 6.0V to 20V
for the device. The VPWR pin supplies power to internal
regulator, analog, and logic circuit blocks. The VDD supply is
used for Serial Peripheral Interface (SPI) communication in
order to configure and diagnose the device. This IC
architecture provides a low quiescent current Sleep mode.
Applying V_PWR and V_DD to the device will place the device in
the Normal mode. The device will transit to Fail-safe mode in
case of failures on the SPI or/and on VDD voltage.
HIGH SIDE SWITCHES: HS0 – HS3
These pins are the high side outputs controlling
automotive lamps located for the rear of vehicle, such as 28W
bulbs and LED modules. 55W/65W lamps can be driven for
two outputs shorted together. Those N-channel MOSFETs
with 35mΩ R_DS(ON) are self-protected and present extended
diagnostics in order to detect bulb outage and short-circuit
fault condition. The HS output is actively clamped during turn
off of inductive loads and inductive battery line.
When driving DC motor or solenoid loads demanding
multiple switching, an external recirculation device must be
used to maintain the device in its Safe Operating Area.
MCU INTERFACE AND OUTPUT CONTROL
In Normal mode, each bulb is controlled directly from the
MCU through SPI. A pulse width modulation control module
allows improvement of lamp lifetime with bulb power
regulation (PWM frequency range from 100Hz to 400Hz) and
35XS3400
18
Analog Integrated Circuit Device Data
Freescale Semiconductor