LPC2378FBD144 NXP Semiconductors, LPC2378FBD144 Datasheet - Page 57

• Manufacturer Part Number: LPC2378FBD144
• Description: MCU 32BIT ARM7, 10/100, USB, CAN
• Manufacturer: NXP Semiconductors

Specifications of LPC2378FBD144

• Core Size: 32bit
• No. Of I/o's: 104
• Program Memory Size: 512KB
• Ram Memory Size: 58KB
• Cpu Speed: 72MHz
• Oscillator Type: External, Internal
• No. Of Timers: 4
• No. Of Pwm Channels: 6
• Digital Ic Case: RoHS Compliant
• Controller Family/series: LPC23xx
• Rohs Compliant: Yes

NXP Semiconductors
LPC2377_78
Product data sheet
Fig 20. LPC2378 USB interface on a bus-powered device
14.2 Crystal oscillator XTAL input and component selection
The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a
clock in slave mode, it is recommended that the input be coupled through a capacitor with
C
capacitor to ground C
slave mode, a minimum of 200 mV (RMS) is needed.
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(Figure
corresponds to a square wave signal with a signal swing of between 280 mV and 1.4 V.
The XTALOUT pin in this configuration can be left unconnected.
External components and models used in oscillation mode are shown in
Table 15
and the capacitances C
fundamental mode oscillation (the fundamental frequency is represented by L, C
R
not be larger than 7 pF. Parameters F
manufacturer.
Fig 21. Slave mode operation of the on-chip oscillator
i
S
= 100 pF. To limit the input voltage to the specified range, choose an additional
). Capacitance C
LPC23XX
21), with an amplitude between 200 mV (RMS) and 1000 mV (RMS). This
and
Table
All information provided in this document is subject to legal disclaimers.
P
16. Since the feedback resistance is integrated on chip, only a crystal
in
V
USB_UP_LED
V
USB_D+
USB_D−
V
g
DD(3V3)
BUS
SS
which attenuates the input voltage by a factor C
Figure 22
X1
Rev. 5 — 17 June 2010
and C
R S = 33 Ω
R S = 33 Ω
R2
X2
represents the parallel package capacitance and should
need to be connected externally in case of
R1
1.5 kΩ
OSC
XTAL1
C i
100 pF
LPC2xxx
, C
L
, R
Single-chip 16-bit/32-bit microcontrollers
S
002aae718
C g
and C
002aac579
P
are supplied by the crystal
USB-B
connector
LPC2377/78
i
© NXP B.V. 2010. All rights reserved.
/ (C
Figure 22
i
+ C
g
L
). In
and
and in
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