33812 Datasheet, PDF (19/25 Pages) Freescale Semiconductor, Inc – SMALL ENGINE CONTROL IC

FUNCTIONAL DEVICE OPERATION
ISO-9141 TRANSCEIVER OPERATION
ISO-9141 TRANSCEIVER OPERATION
Bus I/O Pin (ISO9141)
This I/O pin represents the single-wire bus transmitter and
receiver.
Transmitter Characteristics
The ISO-9141 bus transmitter is a low side MOSFET with
internal over-current thermal shutdown. An internal pull-up
resistor with a serial diode structure is integrated so no
external pull-up components are required for the application
in a slave node.
Voltage can go from -18 V to 40 V without current supplied
from any other source than the pull-up resistance. The
ISO9141 pin exhibits no reverse current from the ISO9141
bus line to VPWR, even in the event of GND shift or VPWR
disconnection.
The transmitter has one slew rate (normal slew rate)
Receiver Characteristics
The receiver thresholds are ratiometric with the VPWR
supply pin.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33812
19