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| 型号： | OM13006,598 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 35/51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： | 板 |
| 相关产品： | 568-5213-ND - IC ENERGY METER ARM 32VQFN |
| 其它名称： | 568-6681 |
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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
40 of 51
NXP Semiconductors
EM773
Energy metering IC
11. Application information
11.1 XTAL input
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
Ci = 100 pF. To limit the input voltage to the specified range, choose an additional
capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). 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 22), 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 23 and in
and the capacitances CX1 and CX2 need to be connected externally in case of
fundamental mode oscillation (the fundamental frequency is represented by L, CL and
not be larger than 7 pF. Parameters FOSC, CL, RS and CP are supplied by the crystal
manufacturer (see Table 15).
Fig 22. Slave mode operation of the on-chip oscillator
EM773
XTALIN
Ci
100 pF
Cg
002aag730
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