Datasheet

Ground (GND)
Enable Input (EN)
NWake Input (NWake)
Inhibit Output (INH)
TPIC1021A-Q1
SLIS117A – AUGUST 2007 – REVISED JUNE 2009 .......................................................................................................................................................... www.ti.com
GND is the TPIC1021A device ground connection. The TPIC1021A can operate with a ground shift as long as
the ground shift does not reduce V
SUP
below the minimum operating voltage. If there is a loss of ground at the
ECU level, the TPIC1021A does not have a significant current consumption on LIN bus.
EN controls the operation mode of the TPIC1021A (normal or sleep mode). When EN is high, the TPIC1021A is
in normal mode allowing a transmission path from TXD to LIN and from LIN to RXD. When EN is low the device
is put into sleep mode and there are no transmission paths available. The device can enter normal mode only
after being woken up. EN has an internal pulldown resistor to ensure the device remains in low-power mode
even if EN floats.
NWake is a high-voltage input used to wake up the TPIC1021A from low-power mode. NWake is usually
connected to an external switch in the application. A low on NWake that is asserted longer than the filter time
(t
NWAKE
) results in a local wake-up. NWake provides an internal pullup source to V
SUP
.
INH is used to control an external voltage regulator that has an inhibit input. When the TPIC1021A is in normal
operating mode, the inhibit high-side switch is enabled and the external voltage regulator is activated. When
TPIC1021A is in low-power mode, the inhibit switch is turned off, which disables the voltage regulator. A wake-up
event on for the TPIC1021A returns INH to V
SUP
level. INH can also drive an external transistor connected to an
MCU interrupt input.
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Product Folder Link(s): TPIC1021A-Q1