17XSF500 Datasheet, PDF (13/70 Pages) Freescale Semiconductor, Inc – Penta 17 mOhm High Side Switch

5.3 Block Diagram
The choice of multi-die technology in SOIC exposed pad package including low cost vertical trench FET power die associated
with Smart Power control die lead to an optimized solution.
MCU
Interface
Gen4 - Functional Block Diagram
Power Supply
MCU Interface & Device Control
SPI Interface
Parallel Control Inputs
PWM Controller
Self-protected
High Side
Switches
OUT[x]
Supply
MCU Interface & Output Control
Self-protected High Side Switches
Figure 6. Functional Block Diagram
5.3.1 Self-protected High Side Switches
OUT1… OUT5 are the output pins of the power switches. The power channels are protected against various kinds of short-
circuits and have active clamp circuitry that may be activated when switching off inductive loads. Many protective and diagnostic
functions are available.
5.3.2 Power Supply
The device operates with supply voltages from 5.5 to 40 V (V_PWR), but is full spec. compliant only between 7.0 and 18 V. The
VPWR pin supplies power to the internal regulator, analog, and logic circuit blocks. The VCC pin (5.0 V typ.) supplies the output
register of the Serial Peripheral Interface (SPI). Consequently, the SPI registers cannot be read without presence of V_CC. The
employed IC architecture guarantees a low quiescent current in Sleep mode.
5.3.3 MCU Interface and Device Control
In Normal mode the power output channels are controlled by the embedded PWM module, which is configured by the SPI register
settings. For bidirectional SPI communication, V_CC has to be in the authorized range. Failure diagnostics and configuration are
also performed through the SPI port. The reported failure types are: open-load, short-circuit to supply, severe short-circuit to
ground, overcurrent, overtemperature, clock-fail, and under and overvoltage.
The device allows driving loads at different frequencies up to 400 Hz.
5.4 Functional Description
The device has four fundamental operating modes: Sleep, Normal, Fail, and Power off. It possesses multiple high side switches
(power channels) each of which can be controlled independently:
• in Normal mode by SPI interface. For bidirectional SPI communication, a second supply voltage (V_CC) is required.
• in Fail mode by the corresponding the direct inputs IN1… IN4. The OUT5 for the Penta version and the OUT6
are off in this mode.
Analog Integrated Circuit Device Data
Freescale Semiconductor
MC17XSF500
13