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F87EHHD 参数 Datasheet PDF下载

F87EHHD图片预览
型号: F87EHHD
PDF下载: 下载PDF文件 查看货源
内容描述: [FXTH87E, Family of Tire Pressure Monitor Sensors]
分类和应用:
文件页数/大小: 183 页 / 1700 K
品牌: NXP [ NXP ]
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NXP Semiconductors  
FXTH87E  
FXTH87E, Family of Tire Pressure Monitor Sensors  
4.4.1 VDD and VSS pins  
The digital circuits operate from a single power supply connected to the FXTH87E  
through the VDD and VSS pins. VDD is the positive supply and VSS is the ground. The  
conductors to the power supply should be connected to the VDD and VSS pins and locally  
decoupled as shown in Figure 6.  
Care should be taken to reduce measurement signal noise by separating the VDD, VSS  
,
AVDD, AVSS and RVSS pins using a "star" connection such that each metal trace does not  
share any load currents with other external devices as shown in Figure 6.  
4.4.2 AVDD and AVSS pins  
The analog circuits operate from a single power supply connected to the FXTH87E  
through the AVDD and AVSS pins. AVDD is the positive supply and AVSS is the ground.  
The conductors to the power supply should be connected to the AVDD and AVSS pins and  
locally decoupled as shown in Figure 6.  
Care should be taken to reduce measurement signal noise by separating the VDD, VSS  
,
AVDD, AVSS and RVSS pins using a "star" connection such that each metal trace does not  
share any load currents with other external devices as shown in Figure 6.  
Bypass capacitors  
closely coupled to  
the package pins  
FXTH87E and other load currents  
star connected to battery terminals  
IDD  
ILOAD  
Battery  
V
DD  
to other loads  
0.1  
F
V
SS  
FXTH87E  
AV  
The decoupling devices, although  
drawn here as 0.1 F capacitors,  
may be any type of passive component(s)  
sufficient to block or reduce unwanted  
external radiated signals from corrupting  
the power input protection circuits;  
application tuning may be required.  
DD  
0.1  
F
AV  
SS  
SS  
RV  
aaa-027995  
Figure 6.ꢀRecommended power supply connections  
4.4.3 VREG pin  
The internal regulator for the analog circuits requires an external stabilization capacitor to  
AVSS  
.
4.4.4 RVSS pin  
Power in the RF output amplifier is returned to the supply through the RVSS pin. This  
conductor should be connected to the power supply as shown in Figure 6 using a "star"  
connection such that each metal trace does not share any load currents with other supply  
pins.  
4.4.5 RF pin  
The RF pin is the RF energy data supplied by the FXTH87E to an external antenna.  
FXTH87ERM  
All information provided in this document is subject to legal disclaimers.  
© NXP B.V. 2019. All rights reserved.  
Reference manual  
Rev. 5.0 — 4 February 2019  
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