Datasheet > QT1G

QT1G

更新时间： 2024-01-12 21:52:09

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

阅读下载

中文翻译

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

QT1G 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	compliant	风险等级：	5.65
Is Samacsys：	N	Base Number Matches：	1

QT1G 数据手册

Figure 3-2

Figure 3-3

Getting HeartBeat pulses with a pull-down resistor

Using a micro to obtain HB pulses in either output state

HeartBeat™ Pulses

PORT_M.1

OUT1

OUT2

FILT

SNS2

SNS1

POL

OUT1

OUT2

FILT

SNS2

SNS1

POL

PORT_M.2

PORT_M.3

Microprocessor

PORT_M.4

Conversely, a pull-up resistor will show HeartBeat pulses The QT114 does have diode protection on its terminals which

when the line is low (detecting).

can absorb and protect the device from most induced

discharges, up to 20mA; the usefulness of the internal

clamping will depending on the probe insulation's dielectric

properties, thickness, and the rise time of the transients. ESD

dissipation can be aided further with an added diode

protection network as shown in Figure 3-5. Because the

If active-high OUT polarity is selected, the pulses will only

appear if there is a pull-up resistor in place and the fluid is

not present (no detection, low output), or, if there is a

pull-down resistor and the output is active (high output).

If the sensor is wired to a microprocessor as shown in Figure charge and transfer times of the QT114 are relatively long,

the circuit can tolerate very large values of Re1, as much as

50k ohms in most cases without affecting gain. The added

3-3, the microprocessor can reconfigure the load resistor to

either ground or Vcc depending on the output state of the

QT114, so that the pulses are evident in either state with diodes shown (1N4150, BAV99 or equivalent low-C diodes)

will shunt the ESD transients away from the part, and Re1 will

current-limit the rest into the QT110's own internal clamp

diodes. C1 should be around 10µF if it is to absorb positive

transients from a human body model standpoint without

rising in value by more than 1 volt. If desired C1 can be

replaced with an appropriate zener diode. Directly placing

semiconductor transient protection devices or MOV's on the

sense lead is not advised; these devices have extremely

large amounts of parasitic C which will swamp the sensor.

either POL setting.

GATE OR

MICRO INPUT

CMOS

OUT1

OUT2

FILT

SNS2

SNS1

POL

C_o

100pF

CMOS

Re2 functions to isolate the transient from the QT110's Vcc

pin; values of around 1K ohms are reasonable.

100pF

C_o

As with all ESD protection networks, it is important that the

transients be led away from the circuit. PCB ground layout is

crucial; the ground connections to the diodes and C1 should

all go back to the power supply ground or preferably, if

available, a chassis ground connected to earth. The currents

should not be allowed to traverse the area directly under the

QT114.

Figure 3-4 Eliminating HB Pulses

Electromechanical devices will ignore this short pulse. The

pulse also has too low a duty cycle to visibly affect LED’s. It

can be filtered completely if desired, by adding an RC time

constant to filter the output, or if interfacing directly and only

to a high-impedance CMOS input, by doing nothing or at

most adding a small noncritical capacitor from each used

OUT line to ground (Figure 3-4).

Vcc

C 10✙F

3.4 ESD PROTECTION

In some installations the QT114 will be protected from direct

static discharge by the insulation of the electrode and the

fact that the probe may not be accessible to human contact.

To Electrodes

OUT1

OUT2

FILT

SNS2

SNS1

POL

However, even with probe insulation, transients can still flow

into the electrode via induction, or in extreme cases, via

dielectric breakdown. Some moving fluids (like oils) and

powders can build up a substantial triboelectric charge

directly on the probe surface.

8 Gnd

Figure 3-5 ESD Protection Network

QT114 R1.04/1106

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

中文翻译

下载PDF

与QT1G相关器件

型号	品牌	获取价格	描述	数据表
QT1HC-SERIES	ETC	获取价格	Peripheral IC
QT1T-SERIES	ETC	获取价格	Peripheral IC
QT20.241	PULS	获取价格	THREE PHASE INPUT
QT20.241-C1	PULS	获取价格	THREE PHASE INPUT
QT202IT.A1A2	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,
QT202IT.A1R0	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,
QT202IT.A2A0	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,
QT202IT.A2A1	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,
QT202IT.A2A2	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,
QT202IT.A2R1	QT	获取价格	Single Color LED, High Efficiency Red, Red Clear, T-1, 3mm,

与QT1G相关文章

深入解读IR2103资料手册：引脚说明、电气参数及替换型号推荐
2024-06-06

2
L7805CV手册解读：引脚说明、替代型号推荐、好坏检测
2024-06-06

2
MMBT5551资料手册解读：电气参数、替换型号推荐
2024-06-06

1
APW7073资料手册解读：产品特性、引脚说明、替换型号推荐
2024-06-06

0

产品中心

服务支持

精选活动

关于我们

帮助中心

QT1G

QT1G 技术参数

QT1G 数据手册

与QT1G相关器件

与QT1G相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

QT1G

QT1G 技术参数

QT1G 数据手册

与QT1G相关器件

与QT1G相关文章

您还可以找

您在本页遇到什么问题？