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参数资料
| 型号： | AD7873BRQZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 16QSOP |
| 标准包装： | 1,000 |
| 类型： | 电阻 |
| 触摸面板接口： | 4 线 |
| 输入数/键： | 1 TSC |
| 分辨率（位）： | 12 b |
| 评估套件： | 可供 |
| 数据接口： | 串行 |
| 数据速率/采样率 (SPS，BPS)： | 125k |
| 电压基准： | 外部，内部 |
| 电源电压： | 2.2 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
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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
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,
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7874 | 制造商:AD 制造商全称: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 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7874ANZ | 功能描述:IC DAS 12BIT 4CH LC2MOS 28-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Data Converter Basics 标准包装:1 系列:- 类型:电机控制 分辨率（位）:12 b 采样率（每秒）:1M 数据接口:串行，并联 电压电源:单电源 电源电压:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:100-TQFP 供应商设备封装:100-TQFP（14x14） 包装:剪切带 (CT) 其它名称: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 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
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