Datasheet

Unpowered System
V V
sup sup_under
£
Standby Mode
Driver : Off
RXD: Low
INH: High (On)
Termination: 30 kW
EN = high
EN = low
EN = high
LIN Bus Wake-Up
or
Nwake Pin Wake-Up
V > V
EN = low
sup sup_under
V V
sup sup_under
£
V V
sup sup_under
£
V V
sup sup_under
£V > V
EN = high
sup sup_under
Sleep Mode
Driver : Off
RXD: Floating
INH: High impedance (Off)
Termination: Weak pullup
Normal Mode
Driver : On
RXD: LIN bus data
INH: High (On)
Termination: 30 kW
SN65HVDA195-Q1
SLLS961A –JULY 2009–REVISED OCTOBER 2009 www.ti.com
Enable Input (EN)
EN controls the operation mode of the SN65HVDA195 (normal or sleep mode). When EN is high, the
SN65HVDA195 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 Input (NWake)
NWake is a high-voltage input used to wake up the SN65HVDA195 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
.
Inhibit Output (INH)
INH is used to control an external voltage regulator that has an inhibit input. When the SN65HVDA195 is in
normal operating mode, the inhibit high-side switch is enabled and the external voltage regulator is activated.
When SN65HVDA195 is in low-power mode, the inhibit switch is turned off, which disables the voltage regulator.
A wake-up event on for the SN65HVDA195 returns INH to V
SUP
level. INH can also drive an external transistor
connected to an MCU interrupt input.
OPERATING STATES
Figure 1. Operating States Diagram
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