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參數(shù)資料
| 型號： | QT310 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PROGRAMMABLE CAPACITANCE SENSOR IC |
| 中文描述： | 可編程電容傳感器IC |
| 文件頁數(shù)： | 2/20頁 |
| 文件大小： | 837K |
| 代理商： | QT310 |
Serial clone data in
SDI
7
Serial clone data out
SDO
6
Serial clone data clock
SCK
3
Alternate Pin Functions for Cloning
Positive supply
VDD
8
Detection output
OUT
7
Sync Input
/SYNC_I
6
Sense 2 line
SNS2
5
Negative supply (ground)
VSS
4
Sense 1 line
SNS1
3
Sync Output
/SYNC_O
2
Ext Cal, latch clear input
/CAL_CLR
1
Function
Name
Pin
Table 1-1 Pin Descriptions
1 - OVERVIEW
The QT310 is a digital burst mode charge-transfer (QT)
sensor designed for touch controls, level sensing and
proximity sensing; it includes all hardware and signal
processing functions necessary to provide stable sensing
under a wide variety of changing conditions. Only one low
cost sampling capacitor is required for operation.
A unique aspect of the QT310 is the ability of the designer to
‘clone’ a wide range of user-defined setups into the part’s
eeprom during development and in production. Cloned setups
can dramatically alter the behavior of the part. For production,
the parts can be cloned in-circuit or can be procured from
Quantum pre-cloned.
Figure 1-1 shows the basic QT310 circuit using the device,
with a conventional output drive and power supply
connections.
1.1 BASIC OPERATION
The QT310 employs bursts of charge-transfer cycles to
acquire its signal. Burst mode permits power consumption in
the microamp range, dramatically reduces RF emissions,
lowers susceptibility to EMI, and yet permits excellent
response time. Internally the signals are digitally processed to
reject impulse noise, using a 'consensus' filter which requires
several consecutive confirmations of a detection before the
output is activated.
A unique cloning process allows the internal eeprom of the
device to be programmed to permit unique combinations of
sensing and processing functions.
1.2 ELECTRODE DRIVE
1.2.1 S
WITCHING
O
PERATION
The IC implements direct-to-digital capacitance acquisition
using the charge-transfer method, in a process that is better
understood as a capacitance-to-digital converter (CDC). The
QT switches and charge measurement functions are all
internal to the IC (Figure 1-2).
The CDC treats sampling capacitor Cs as a floating store of
accumulated charge which is switched between the sense
pins; as a result, the sense electrode can be connected to
either pin with no performance difference. In both cases the
rule Cs >> Cx must be observed for proper operation. The
polarity of the charge build-up across Cs during a burst is the
same in either case. Typical values of Cs range from 10nF to
200nF.
Larger values of Cx cause charge to be transferred into Cs
more rapidly, reducing available resolution and resulting in
lower gain. Conversely, larger values of Cs reduce the rise of
differential voltage across it, increasing available resolution
and raising gain. The value of Cs can thus be increased to
allow larger values of Cx to be tolerated (Figures 5-1 to 5-2).
As Cx increases, the length of the burst decreases resulting in
lower signal numbers.
The electrode should always be connected to SNS1;
connections to SNS2 are also possible but this can cause the
signal to be susceptible to noise.
It is important to limit the amount of stray Cx capacitance on
both SNS terminals, especially if the Cx load is already large.
L
Q
2
QT310/R1.03 21.09.03
Figure 1-2 Internal Switching
B
S
S
Charge
Amp
Cs
Cx
SNS1
SNS2
Result
Start
Done
Figure 1-1 Basic QT310 circuit
ELECTRODE
C
s
4.7nF
7
1
2
8
+2 to 5 Vdc
6
SYNC_O
OUT
SNS2
SNS1
VDD
C
x
4
5
3
SYNC_I
/CAL
VSS
100nF
10K
Calibration
10K
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QT310-D | PROGRAMMABLE CAPACITANCE SENSOR IC |
| QT310-IS | PROGRAMMABLE CAPACITANCE SENSOR IC |
| QT320 | 2 CHANNEL PROGAMMABLE ADVANCED SENSOR IC |
| QT320-D | 2 CHANNEL PROGAMMABLE ADVANCED SENSOR IC |
| QT320-IS | 2 CHANNEL PROGAMMABLE ADVANCED SENSOR IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| QT310-D | 制造商:Quantum Corp 功能描述:IC TOUCH SENSOR 1CH DIP8 310 |
| QT310-IS | 功能描述:SENSOR IC TOUCH PROG 1CH 8-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:QProx™ 標(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| QT310-ISG | 制造商:Quantum Corp 功能描述:TOUCH SENSOR 1 CHAN SOIC8 310 ((NW)) |
| QT310-ISG SL775 | 制造商:Atmel Corporation 功能描述:TOUCH PRODUCT - Bulk |
| QT310-S | 功能描述:SENSOR IC TOUCH PROG 1CH 8-SOIC 制造商:microchip technology 系列:QProx?? 包裝:管件 零件狀態(tài):停產(chǎn) 觸摸屏:2 線電容 分辨率（位）:16 b 接口:串行 電壓基準(zhǔn):內(nèi)部 電壓 - 電源:1.8 V ~ 5 V 電流 - 電源:600μA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.209"，5.30mm 寬） 供應(yīng)商器件封裝:8-SO 基本零件編號:QT310 標(biāo)準(zhǔn)包裝:95 |
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