参数资料
型号: LPC11U23FBD48/301,
厂商: NXP Semiconductors
文件页数: 53/74页
文件大小: 0K
描述: MCU USB 48LQFP
产品培训模块: Code Density for LPC11xx
标准包装: 250
系列: LPC11Uxx
核心处理器: ARM? Cortex?-M0
芯体尺寸: 32-位
速度: 50MHz
连通性: I²C,Microwire,SPI,SSI,SSP,UART/USART,USB
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 40
程序存储器容量: 24KB(24K x 8)
程序存储器类型: 闪存
EEPROM 大小: 1K x 8
RAM 容量: 8K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.6 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 48-LQFP
包装: 托盘
其它名称: 568-8520
LPC11U23FBD48/301,-ND
LPC11U2X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2014. All rights reserved.
Product data sheet
Rev. 2.2 — 11 March 2014
57 of 74
NXP Semiconductors
LPC11U2x
32-bit ARM Cortex-M0 microcontroller
11.5 Reset pad configuration
11.6 ADC effective input impedance
A simplified diagram of the ADC input channels can be used to determine the effective
input impedance seen from an external voltage source. See Figure 33.
The effective input impedance, Rin, seen by the external voltage source, VEXT, is the
parallel impedance of ((1/fs x Cia) + Rmux + Rsw) and (1/fs x Cio), and can be calculated
using Equation 1 with
fs = sampling frequency
Cia = ADC analog input capacitance
Rmux = analog mux resistance
Rsw = switch resistance
Cio = pin capacitance
(1)
Fig 32. Reset pad configuration
VSS
reset
002aaf274
VDD
Rpu
ESD
20 ns RC
GLITCH FILTER
PIN
Fig 33. ADC input channel
Cia
Rs
VSS
VEXT
002aah615
ADC
COMPARATOR
ADC Block
Rin
Cio
Rmux
Rsw
Source
<2 k
Ω
<1.3 k
Ω
R
in
1
f
s
C
ia
------------------
R
mux
R
sw
++
1
f
s
C
io
------------------
=
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