908E624_10 Datasheet, PDF (25/40 Pages) Freescale Semiconductor, Inc – Integrated Triple High Side Switch with Embedded MCU and LIN Serial Communicationfor Relay Drivers

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MODE1:2
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
VSUP2
HS3ON
Control
On/Off
Status
High-Side Driver
Charge Pump,
Current Limit Protection,
Overtemperature Protection
HS3
Figure 14. High Side HS3 Circuitry
LIN PHYSICAL LAYER
The LIN bus terminal provides a physical layer for single-
wire communication in automotive applications. The LIN
physical layer is designed to meet the LIN physical layer
specification.
The LIN driver is a low-side MOSFET with over-current
protection and thermal shutdown. An internal pullup resistor
with a serial diode structure is integrated, so no external
pullup components are required for the application in a slave
node. The fall time from dominant to recessive and the rise
time from recessive to dominant is controlled. The symmetry
between both slew rate controls is guaranteed.
The slew rate can be selected for optimized operation at
10 and 20kBit/s as well as a fast baud rate for test and
programming. The slew rate can be adapted with the bits
LINSL2:1 in the SPI Control Register. The initial slew rate is
optimized for 20kBit/s.
The LIN terminal offers high susceptibility immunity level
from external disturbance, guaranteeing communication
during external disturbance.
The LIN transmitter circuitry is enabled in Normal and
Normal Request mode.
An over-current condition (e.g. LIN bus short to Vbat) or a
over-temperature in the output low-side FET will shutdown
the transmitter and set the LINFAIL flag in the SPI Status
Register.
For improved performance and safe behavior in case of
LIN bus short to Ground or LIN bus leakage during low power
mode the internal pull-up resistor on the LIN terminal can be
disconnected, with the LIN-PU bit in the SPI Control Register,
and a small current source keeps the LIN bus at recessive
level. In case of a LIN bus short to GND, this feature will
reduce the current consumption in STOP and SLEEP modes.
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E624
25