Datasheet > QT118H-G

QT118H-G

更新时间： 2024-01-17 14:21:17

品牌	Logo	应用领域
昆腾 - QUANTUM		传感器
页数	文件大小	规格书
14页	422K
描述
CHARGE-TRANSFER TOUCH SENSOR

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技术参数
数据手册

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QT118H-G 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	,	Reach Compliance Code：	unknown
风险等级：	5.92	Base Number Matches：	1

QT118H-G 数据手册

In brief summary, the following design rules should be

adhered to for best ESD and EMC results:

3.4 EMC AND RELATED NOISE ISSUES

External AC fields (EMI) due to RF transmitters or electrical

noise sources can cause false detections or unexplained

shifts in sensitivity.

1. Use only SMT components.

2. Keep Cs, Rs, Re and Vdd bypass cap close to the IC.

The influence of external fields on the sensor is reduced by

means of the Rseries described in Section 3.2. The Cs

capacitor and Rseries (see Figure 1-1) form a natural

low-pass filter for incoming RF signals; the roll-off frequency

of this network is defined by -

3. Maximize Re to the limit where sensitivity is not

noticeably affected.

4. Do not place the electrode or its connecting trace near

other traces, or near a ground plane.

5. Do use a ground plane under and around the QT118

itself, back to the regulator and power connector (but not

beyond the Cs capacitor).

F_R=

2✜R_seriesC_s

If for example Cs = 22nF, and Rseries = 10K ohms, the rolloff

frequency to EMI is 723Hz, vastly lower than any credible

external noise source (except for mains frequencies i.e. 50 /

60 Hz). However, Rseries and Cs must both be placed very

close to the body of the IC so that the lead lengths between

them and the IC do not form an unfiltered antenna at very

high frequencies.

6. Do not place an electrode (or its wiring) of one QT

device near the electrode or wiring of another device, to

prevent cross interference.

7. Keep the electrode (and its wiring) away from other

traces carrying AC or switched signals.

8. If there are LEDs or LED wiring near the electrode or its

wiring (ie for backlighting of the key), bypass the LED

wiring to ground on both its ends.

PCB layout, grounding, and the structure of the input circuitry

have a great bearing on the success of a design to withstand

electromagnetic fields and be relatively noise-free.

9. Use a voltage regulator just for the QT118 to eliminate

power noise coupling from other switching sources.

Make sure the regulator’s transient load stability provides

for stable voltage just before each burst commences.

For further tips on construction, PCB design, and EMC issues

browse the application notes and faq at www.qprox.com

QT118H R1.08 / 0405

1...5 6 789 10 11...14

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