Wake-Up Options - NXP Semiconductors UJA1169A User Manual

NXP Semiconductors

2.4 Wake-up options

UM11758
User manual
All UJA1169A variants support a Sleep mode for use in energy-sensitive applications.
Once in Sleep mode, the device will remain in this low-power mode until a wake-up
request is received. A wake-up event can be triggered remotely via a standard pattern or
dedicated wake-up frame on the CAN bus, or locally via the WAKE pin (details of wake-
up functionality can be found in the data sheet and application hints; see
Table 7. WAKE connections
UJA1169A
WAKE (pin 12)
All three UJA1169A evaluation boards feature local wake-up test circuitry. The WAKE pin
is pulled HIGH by default via 10 kΩ resistors R6 and R7. When switch SW1 is pressed,
the WAKE pin is pulled LOW. To test local wake-up functionality, local wake-up must first
be enabled via the UJA1169A register map (as described in the UJA1169A data sheet
[1]).
Regulator V1 on the UJA1169A is intended to supply the MCU. V1 is off in Sleep mode
and switches on automatically when a wake-up event is detected.
The WAKE pin can be accessed via header J3 on the top of the board.
J3
WAKE
GND
Figure 11. Local wake-up circuitry
All information provided in this document is subject to legal disclaimers.
UJA1169Ax-EVB
J3-11: connect to wake-up signal
R7, 10 kΩ R6, 10 kΩ
BAT
SW1
Rev. 1 — 19 April 2022
UM11758
UJA1169A evaluation boards
WAKE(p12)
UJA1169A
C7
10 nF
GND
(p1,4,16,19)
aaa-045551
© NXP B.V. 2022. All rights reserved.
Section 7).
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