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QT114

更新时间： 2024-02-12 12:03:09

品牌	Logo	应用领域
高通 - QUALCOMM		传感器
页数	文件大小	规格书
14页	247K
描述
QLEVEL⑩ SENSOR IC

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QT114 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SOP, SOP8,.25	Reach Compliance Code：	unknown
风险等级：	5.92	Is Samacsys：	N
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	R-PDSO-G8
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
电源：	3 V	认证状态：	Not Qualified
子类别：	Other Consumer ICs	表面贴装：	YES
技术：	CMOS	温度等级：	COMMERCIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	Base Number Matches：	1

QT114 数据手册

T₁

Figure 2-9 Twin-Level Internal Horizontal Probes

Figure 2-8 Single Internal Horizontal Probe

T₂

Figure 2-10 Coaxial Probe For Non-Aqueous Fluids

Figure 2-11 Twin-Level Coaxial Probes For

Non-Aqueous Fluids

A bare internal probe used with conductive fluids and an

in-line blocking capacitor will generate a huge, robust

capacitive response that will not readily permit the use of a

two-level probe due to signal saturation. Even the slightest

amount of bare metal exposed to the fluid will usually

generate an immediate, large response with aqueous fluids.

2.2.7 VISCOUS, CONDUCTIVE

ILMS

Highly viscous fluids, or those having a high surface tension,

and having substantial conductivity can fool some electrode

designs into thinking that there is fluid present when there is

not. This is a particular problem with external electrodes,

where the residual films of certain types of fluids inside the

container, electrically coupled to the fluid mass below, will

create a substantial capacitive response. Internal probes are

much more resistant to this effect since the fluid surface is

guaranteed to become mechanically disconnected from the

probe when the level drops. Coating the inner vessel surface

with a smooth plastic of polyethylene or PTFE often has a

very beneficial effect on this phenomenon.

2.2.6 SCALE

UILDUP

Scale buildup on internal probes, bare or insulated, is not

generally a problem since the sensor is still measuring

capacitance, not conductance, and

reduction in

conductivity around the probe will have minimal or no effect.

Probe designs should be tested for this to be certain in all

specific cases.

2.3 SINGLE LEVEL SENSING

A legitimate concern with bare metal probes is the buildup of

scale or other deposits at the entry point of the probe into the

vessel. Such deposits may create a conductive surface path

(especially if the vessel is made of metal) that may lead to

false-positive trips. If the shank of the probe at the entry point

is insulated enough so that conductive bridging cannot occur,

this problem should be alleviated.

When sensing for a single trip point, the single electrode can

be a simple horizontal strip on the outside of a nonmetallic

vessel (Figure 2-2), or an internal probe having a substantial

horizontal 'plateau' at the trip point (Figures 2-4, 2-5, 2-8,

2-10). When the strip or plateau is ‘covered’ with fluid the IC

will detect on at least the OUT1 line; OUT2 can be ignored.

QT114 R1.04/1106

1 2 3 456 7 8...14

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