參數(shù)資料
型號: LPC1751FBD80
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: Cortex-M3 with 32 kB flash, 8 kB SRAM, USB 2.0 Device, CAN, 12-bit ADC
中文描述: 32-BIT, FLASH, 100 MHz, RISC MICROCONTROLLER, PQFP80
封裝: 12 X 12 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT315-1, 80 PIN
文件頁數(shù): 64/74頁
文件大?。?/td> 1572K
代理商: LPC1751FBD80
LPC1759_58_56_54_52_51
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 7 — 29 March 2011
64 of 74
NXP Semiconductors
LPC1759/58/56/54/52/51
32-bit ARM Cortex-M3 microcontroller
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
i
= 100 pF. To limit the input voltage to the specified range, choose an additional
capacitor to ground C
g
which attenuates the input voltage by a factor C
i
/(C
i
+ C
g
). In 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 32
), with an amplitude between 200 mV(RMS) and 1000 mV(RMS). This
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
Figure 33
and in
Table 21
and
Table 22
. Since the feedback resistance is integrated on chip, only a crystal
and the capacitances C
X1
and C
X2
need to be connected externally in case of
fundamental mode oscillation (the fundamental frequency is represented by L, C
L
and
R
S
). Capacitance C
P
in
Figure 33
represents the parallel package capacitance and should
not be larger than 7 pF. Parameters F
OSC
, C
L
, R
S
and C
P
are supplied by the crystal
manufacturer.
Fig 31. LPC1759/58/56/54/52/51 USB device port configuration
LPC17xx
USB-B
connector
33
Ω
33
Ω
002aad943
USB_UP_LED
USB_CONNECT
V
DD
V
DD
D+
D
USB_D+
USB_D
V
BUS
V
BUS
V
SS
Fig 32. Slave mode operation of the on-chip oscillator
LPC1xxx
XTAL1
Ci
100 pF
Cg
002aae835
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