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參數(shù)資料
| 型號： | QT320 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2 CHANNEL PROGAMMABLE ADVANCED SENSOR IC |
| 中文描述： | 2頻道PROGAMMABLE先進(jìn)傳感器IC |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 960K |
| 代理商： | QT320 |
2.7.3 H
EART
B
EAT
O
UTPUT
Both OUT pins have HeartBeat
‘
health
’
indicator pulses
superimposed on them. Heartbeat floats both 'OUT' pins for
approximately 15μs once before Channel 2
’
s burst.
These pulses can be used to determine that the sensor is
operating properly. The pulses are evident on an OUT line
that is low, and appear as positive pulses.
They are not evident on an OUT pin that is high.
Heartbeat indication can be used to determine if the chip is
operating properly. The frequency of the pulses can be used
to determine if the IC is operating within desired limits.
It is not possible to disable these pulses.
Heartbeat pulses can be easily filtered by placing a suitable
capacitor from an OUT pin to Vss, to prevent the OUT line
from rising substantially within the 15μs pulse. For example,
with a 10K pullup resistor, the capacitor can be 0.015μF of
virtually any type.
2.7.4 O
UTPUT
D
RIVE
C
APABILITY
The outputs can sink up to 2mA of non-inductive current. If an
inductive load is used, such as a small relay, the load should
be diode-clamped to prevent damage. The current must be
limited to 2mA max to prevent detection side effects from
occurring, which happens when the load current creates
voltage drops on the die and bonding wires; these small shifts
can materially influence the signal level to cause detection
instability.
3 CIRCUIT GUIDELINES
3.1 SAMPLE CAPACITORS
Cs capacitors can be virtually any plastic film or low to
medium-K ceramic capacitor. The normal usable Cs range is
from 1nF ~ 200nF depending
on the sensitivity required;
larger values of Cs require higher stability to ensure reliable
sensing. Acceptable capacitor types include NPO or C0
G
ceramic, PPS film, Y5E and
X
7R ceramic in that order.
If the design requires sensitivity matching between channels,
it is strongly advised to use tight tolerance capacitors and to
trim the relative sensitivities as described in Section 1.4.4.
3.2 POWER SUPPLY
3.2.1 S
TABILITY
The QT320 derives its internal references from the power
supply. Sensitivity shifts and timing changes will occur with
changes in Vdd, as often happens when additional power
supply loads are switched on or off via one of the Out pins.
These supply shifts can induce detection
‘
cycling
’
, whereby
an object is detected, the load is turned on, the supply sags,
the detection is no longer sensed, the load is turned off, the
supply rises and the object is reacquired,
ad infinitum
.
Detection
‘
stiction
’
, the opposite effect, can occur if a load is
shed when an output is active and the signal swings are
small: the Out pin can remain stuck even if the detected
object is no longer near the electrode.
3.2.2 S
UPPLY
R
EQUIREMENTS
Vdd can range from 1.8 to 5.25 volts during operation, and
2.2 to 5.25 during eeprom Setups configuration. Current drain
will vary depending on Vdd, the chosen sleep cycles, and the
burst lengths. Increasing Cx values will
decrease
power drain
since increasing Cx loads decrease burst length (Figures
5-1,
5-4).
If the power supply is shared with another electronic system,
care should be taken to assure that the supply is free of
spikes, sags, and surges. The QT320 will track slow changes
in Vdd if drift compensation is enabled, but it can be adversely
affected by rapid voltage steps and spikes at the millivolt
level.
If desired, the supply can be regulated using a conventional
low current regulator, for example CMOS LDO regulators with
low quiescent currents, or standard 78Lxx-series 3-terminal
regulators.
For proper operation a 100nF (0.1uF) ceramic bypass
capacitor should be used between Vdd and Vss; the bypass
cap should be placed very close to the Vdd and Vss pins.
3.3 PCB LAYOUT
3.3.1 G
ROUND
P
LANES
The use of ground planes around the device is encouraged
for noise reasons, but ground should not be coupled too close
to the four sense pins in order to reduce Cx load. Likewise,
the traces leading from the sense pins to the electrode should
not be placed directly over a ground plane; rather, the ground
plane should be relieved by at least 3 times the width of the
sense traces directly under it, with periodic thin bridges over
the gap to provide ground continuity.
3.3.2 C
LONE
P
ORT
C
ONNECTOR
If a cloning connector is used, place this close to the QT320
(Figure 4-1). Placing the cloning connector far from the
QT320 will increase the load capacitance Cx of the sensor
and decrease sensitivity, as some of the cloning lines are
sense lines. Long distances on these lines can also make the
clone process more susceptible to communication errors from
ringing and interference.
Cloning can be designed for production by using pads (SMT
or through-hole) on the solder side which are connected to a
fixture via spring loaded ATE-style
‘
pogo-pins
’
. This eliminates
the need for an actual connector to save cost.
l
Q
10
QT320/R1.03 08/02
Figure 3-1 ESD/EMC protection resistors
1
7
OUT2
4
2
S2B
OUT2
S2A
5
S1B
S1A
8
RE4
RE3
OUT1
VSS
6
OUT1
3
Vdd
VDD
RE2
RE1
SENSOR 2
SENSOR 1
CS1
CS2
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| QT320-D | 功能描述:SENSOR IC TOUCH PROG 2CH 8-DIP 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) |
| QT320-IS | 功能描述:SENSOR IC TOUCH PROG 2CH 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) |
| QT320-ISG | 功能描述:SENSOR IC TOUCH PROG 2CH 8-SOIC RoHS:是 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) |
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| QT-35B | 功能描述:印刷電路板和試驗板 TEST SOCKET 60 TIE POINTS, BREADBOARD RoHS:否 制造商:3M Electronic Solutions Division 產(chǎn)品:Jumper & Insulated Wires 描述/功能:Jumper wire, 22 AWG 0.1 inch 長度:0.1 in 寬度: |
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