Datasheet

LPC84x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 1.7 — 27 February 2018 46 of 97
NXP Semiconductors
LPC84x
32-bit Arm Cortex-M0+ microcontroller
11.2 Power-up ramp conditions
[1] Assert the external reset pin until V
DD
is > 1.8 V if the power-up characteristic specification cannot be
implemented.
[2] V
DD
to stay above V
1
for the entire duration t
wd
.
[3] V
DD
to stay below V
2
for the minimum duration of t
wd
.
Table 12. Power-up characteristics
[1]
T
amb
= 40 C to +105 C.
Symbol Parameter Min Typ Max Unit
t
wd
Window duration
(time where
V
1
<V
DD
<V
2
)
--8 ms
V
1
Window low voltage
[2]
1.4 - - V
V
2
Window high voltage
[3]
--1.8 V
t
1
: The time when there is no restriction on the ramp rate.
Fig 15. Power-up ramp
V
DD
V
2
0
t
wd
t
1
V
1
aaa-025788