LPC5411x
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 2.1 — 9 May 2018
67 of 105
NXP Semiconductors
LPC5411x
32-bit ARM Cortex-M4/M0+ microcontroller
11.7 Watchdog oscillator
[1]
Typical ratings are not guaranteed. The values listed are at nominal supply voltages.
[2]
The typical frequency spread over processing and temperature (T
amb
=
40
C to +105
C) is
40 %.
[3]
Actual jitter dependent on amplitude and spectrum of substrate noise.
[4]
Guaranteed by design. Not tested in production samples.
11.8 I
2
C-bus
[1]
Guaranteed by design. Not tested in production.
[2]
Parameters are valid over operating temperature range unless otherwise specified. See the I
2
C-bus specification
UM10204
for details.
[3]
tHD;DAT is the data hold time that is measured from the falling edge of SCL; applies to data in transmission and the acknowledge.
[4]
A device must internally provide a hold time of at least 300 ns for the SDA signal (with respect to the V
IH
(min) of the SCL signal) to
bridge the undefined region of the falling edge of SCL.
[5]
C
b
= total capacitance of one bus line in pF. If mixed with Hs-mode devices, faster fall times are allowed.
Table 28.
Dynamic characteristics: Watchdog oscillator
T
amb
=
40
C to +105
C; 1.62 V
V
DD
3.6 V
Symbol
Parameter
Min
Typ
Max
Unit
f
osc(int)
internal watchdog oscillator
frequency
6
-
1500
kHz
D
clkout
clkout duty cycle
48
-
52
%
J
PP-CC
peak-peak period jitter
-
1
20
ns
t
start
start-up time
-
4
-
s
Table 29.
Dynamic characteristic: I
2
C-bus pins
T
amb
=
40
C to +105
C; 1.62 V
V
DD
Symbol
Parameter
Conditions
Min
Max
Unit
f
SCL
SCL clock frequency
Standard-mode
0
100
kHz
Fast-mode
0
400
kHz
Fast-mode Plus
0
1
MHz
t
f
fall time
of both SDA and SCL signals
Standard-mode
-
300
ns
Fast-mode
20 + 0.1
C
b
300
ns
Fast-mode Plus
-
120
ns
t
LOW
LOW period of the SCL clock
Standard-mode
4.7
-
s
Fast-mode
1.3
-
s
Fast-mode Plus
0.5
-
s
t
HIGH
HIGH period of the SCL clock
Standard-mode
4.0
-
s
Fast-mode
0.6
-
s
Fast-mode Plus
0.26
-
s
t
HD;DAT
data hold time
Standard-mode
0
-
s
Fast-mode
0
-
s
Fast-mode Plus
0
-
s
t
SU;DAT
data set-up time
Standard-mode
250
-
ns
Fast-mode
100
-
ns
Fast-mode Plus
50
-
ns