Limp Output - NXP Semiconductors UJA1169A User Manual

NXP Semiconductors

2.5 LIMP output

UM11758
User manual
The LIMP pin can be accessed on top-side connector J3. It is targeted at applications
that need a 'limp home' feature in the event of serious ECU failure. LIMP is an open-drain
low-side output. It can be biased to an application-specific voltage level, such as via a
pull-up resistor to BAT in the evaluation setup.
Red LED D4, connected in series with resistor R5, turns on when LIMP is triggered.
Table 8. VEXT connection
UJA1169A
LIMP (pin 11)
UJA1169A
Figure 12. LIMP circuitry
All information provided in this document is subject to legal disclaimers.
UJA1169Ax-EVB
J3-14: connect to limp home signal
BAT
LIMP(p11)
Rev. 1 — 19 April 2022
UJA1169A evaluation boards
R5
1 kΩ
D4
LED
LIMP
aaa-045552
UM11758
J3
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