参数资料
型号: OM13006,598
厂商: NXP Semiconductors
文件页数: 36/51页
文件大小: 0K
描述: BOARD EVAL EM773 METER EU PLUG
其它有关文件: EM773 Energy Metering IC Training
设计资源: Plug Meter Schematics, Gerber Files
USB Dongle Schematics, Gerber Files
标准包装: 1
主要目的: 电源管理,电度表/功率表
嵌入式: 是,MCU,32 位
已用 IC / 零件: EM773FHN33,551
已供物品:
相关产品: 568-5213-ND - IC ENERGY METER ARM 32VQFN
其它名称: 568-6681
EM773
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2 — 3 January 2012
41 of 51
NXP Semiconductors
EM773
Energy metering IC
11.2 XTAL Printed Circuit Board (PCB) layout guidelines
The crystal should be connected on the PCB as close as possible to the oscillator input
and output pins of the chip. Take care that the load capacitors CX1, CX2, and CX3 in case
of third overtone crystal usage have a common ground plane. The external components
must also be connected to the ground plain. Loops must be made as small as possible in
Fig 23. Oscillator modes and models: oscillation mode of operation and external crystal
model used for CX1/CX2 evaluation
Table 15.
Recommended values for CX1/CX2 in oscillation mode (crystal and external
components parameters) low frequency mode
Fundamental oscillation
frequency FOSC
Crystal load
capacitance CL
Maximum crystal
series resistance RS
External load
capacitors CX1, CX2
1 MHz - 5 MHz
10 pF
< 300
18 pF, 18 pF
20 pF
< 300
39 pF, 39 pF
30 pF
< 300
57 pF, 57 pF
5 MHz - 10 MHz
10 pF
< 300
18 pF, 18 pF
20 pF
< 200
39 pF, 39 pF
30 pF
< 100
57 pF, 57 pF
10 MHz - 15 MHz
10 pF
< 160
18 pF, 18 pF
20 pF
< 60
39 pF, 39 pF
15 MHz - 20 MHz
10 pF
< 80
18 pF, 18 pF
Table 16.
Recommended values for CX1/CX2 in oscillation mode (crystal and external
components parameters) high frequency mode
Fundamental oscillation
frequency FOSC
Crystal load
capacitance CL
Maximum crystal
series resistance RS
External load
capacitors CX1, CX2
15 MHz - 20 MHz
10 pF
< 180
18 pF, 18 pF
20 pF
< 100
39 pF, 39 pF
20 MHz - 25 MHz
10 pF
< 160
18 pF, 18 pF
20 pF
< 80
39 pF, 39 pF
002aag731
EM773
XTALIN
XTALOUT
CX2
CX1
XTAL
=
CL
CP
RS
L
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