參數(shù)資料
型號(hào)： AD7873BRQZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 10/29頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT TOUCHSCREEN 16QSOP
標(biāo)準(zhǔn)包裝： 1,000
類型： 電阻
觸摸面板接口： 4 線
輸入數(shù)/鍵： 1 TSC
分辨率（位）： 12 b
評(píng)估套件： 可供
數(shù)據(jù)接口： 串行
數(shù)據(jù)速率/采樣率 (SPS，BPS)： 125k
電壓基準(zhǔn)： 外部，內(nèi)部
電源電壓： 2.2 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 帶卷 (TR)
Data Sheet
AD7873
Rev. F | Page 17 of 28
Battery Measurement
The AD7873 can monitor a battery voltage from 0 V to 6 V.
Figure 31 shows a block diagram of a battery voltage monitored
through the VBAT pin. The voltage to the +VCC of the AD7873 is
maintained at the desired supply voltage via the dc-to-dc
regulator while the input to the regulator is monitored. This
voltage on VBAT is divided by 4 so that a 6 V battery voltage is
presented to the ADC as 1.5 V. To conserve power, the divider is
on only during the sampling of a voltage on VBAT. Table 6 shows
the control bit settings required to perform a battery
measurement.
Figure 31. Block Diagram of Battery Measurement Circuit
Pressure Measurement
The pressure applied to the touch screen via a pen or finger
can also be measured with the AD7873 with some simple
calculations. The 8-bit resolution mode would be sufficient for
this measurement, but the following calculations are shown
with the 12-bit resolution mode. The contact resistance between
the X and Y plates is measured, providing a good indication of
the size of the depressed area and the applied pressure. The area
of the spot touched is proportional to the size of the object
touching it. The size of this resistance (RTOUCH) can be calculated
using two different methods.
The first method requires the user to know the total resistance
of the X-plate tablet. Three touch screen conversions are
required, a measurement of the X-position, Z1-position, and
Z2-position (see Figure 32). The following equation calculates
the touch resistance:
(
)
(
) (
)
[
]1
/
4095
/
×
=
1
2
POSITION
XPLATE
TOUCH
Z
X
R
The second method requires that the resistance of both the
X-plate and Y-plate tablets are known. Again three touch screen
conversions are required, a measurement of the X-position,
Y-position, and Z1-position (see Figure 32).
The following equation also calculates the touch resistance:
(
)
(
) (
)
[
]
{
}
(
)
[
]
4095
/
1
/
4096
4095
/
POSITION
YPLATE
1
POSITION
1
XPLATE
TOUCH
Y
R
Z
X
Z
R
×
/
×
=
Figure 32. Pressure Measurement Block Diagram
+
BATTERY
0V TO 6V
DC/DC
CONVERTER
+VCC
VBAT
0V TO 1.5V
ADC CORE
7.5k
2.5k
02164-
031
+
–
+
–
+
–
X+
X–
X+
X–
Y+
Y–
TOUCH
Z2-POSITION
Z1-POSITION
TOUCH
X-POSITION
Y+
X+
X–
Y–
Y+
MEASURE X-POSITION
MEASURE Z1-POSITION
MEASURE Z2-POSITION
02164-
032
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7874 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System
AD7874AN 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤(pán)
AD7874ANZ 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1
AD7874ANZ 制造商:Analog Devices 功能描述:IC 12-BIT ADC
AD7874AQ 功能描述:IC DAS 12BIT 4CH 5V 28-CDIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤(pán)
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