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AD7877ACP-REEL7 PDF预览

AD7877ACP-REEL7

更新时间: 2024-02-26 20:27:03
品牌 Logo 应用领域
亚德诺 - ADI 消费电路商用集成电路控制器
页数 文件大小 规格书
44页 1392K
描述
Touch Screen Controller

AD7877ACP-REEL7 技术参数

是否无铅: 含铅是否Rohs认证: 不符合
生命周期:Active零件包装代码:QFN
包装说明:HVQCCN,针数:32
Reach Compliance Code:unknown风险等级:5.07
其他特性:FUNCTIONALLY IT OPERATES FROM 2.2 TO 5.25V商用集成电路类型:CONSUMER CIRCUIT
JESD-30 代码:S-XQCC-N32JESD-609代码:e0
长度:5 mm湿度敏感等级:3
功能数量:1端子数量:32
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:UNSPECIFIED封装代码:HVQCCN
封装形状:SQUARE封装形式:CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度(摄氏度):240认证状态:COMMERCIAL
座面最大高度:1 mm最大供电电压 (Vsup):3.6 V
最小供电电压 (Vsup):2.7 V表面贴装:YES
温度等级:INDUSTRIAL端子面层:TIN LEAD
端子形式:NO LEAD端子节距:0.5 mm
端子位置:QUAD处于峰值回流温度下的最长时间:30
宽度:5 mmBase Number Matches:1

AD7877ACP-REEL7 数据手册

 浏览型号AD7877ACP-REEL7的Datasheet PDF文件第2页浏览型号AD7877ACP-REEL7的Datasheet PDF文件第3页浏览型号AD7877ACP-REEL7的Datasheet PDF文件第4页浏览型号AD7877ACP-REEL7的Datasheet PDF文件第5页浏览型号AD7877ACP-REEL7的Datasheet PDF文件第6页浏览型号AD7877ACP-REEL7的Datasheet PDF文件第7页 
Touch Screen Controller  
AD7877  
FEATURES  
4-wire touch screen interface  
FUNCTIONAL BLOCK DIAGRAM  
V
CC  
7
LCD noise reduction feature (STOPACQ pin)  
Automatic conversion sequencer and timer  
User-programmable conversion parameters  
On-chip temperature sensor: −40°C to +85°C  
On-chip 2.5 V reference  
AD7877  
12  
10  
13  
11  
X+  
X–  
Y+  
Y–  
X– Y– GND X+ Y+  
V
REF  
On-chip 8-bit DAC  
3 auxiliary analog inputs  
1 dedicated and 3 optional GPIOs  
2 direct battery measurement channels (0.5 V to 5 V)  
3 interrupt outputs  
DUAL 3-1  
MUX  
6
5
4
AUX1/GPIO1  
AUX2/GPIO2  
AUX3/GPIO3  
REF–  
REF+  
CLOCK  
9 TO 1  
I/P  
MUX  
12-BIT SUCCESSIVE  
APPROXIMATION ADC  
WITH TRACK-AND-HOLD  
IN  
3
BAT1  
BATTERY  
MONITOR  
SEQUENCER  
STOP  
Touch-pressure measurement  
Wake up on touch function  
20  
ACQ  
STOPACQ  
LOGIC  
2
BAT2  
RESULTS  
REGISTERS  
BATTERY  
MONITOR  
Specified throughput rate of 125 kSPS  
Single supply, VCC of 2.7 V to 5.25 V  
Separate VDRIVE level for serial interface  
Shutdown mode: 1 µA maximum  
32-lead LFCSP 5 mm x 5 mm package  
LIMIT  
14  
15  
AGND  
DGND  
COMPARATOR  
LIMIT  
TEMPERATURE  
SENSOR  
REGISTERS  
31  
V
REF  
ALERT STATUS/  
MASK REGISTER  
ALERT  
LOGIC  
22  
21  
ALERT  
GPIO4  
2.5V  
REF  
BUF  
GPIO  
REGISTERS  
APPLICATIONS  
Personal digital assistants  
Smart hand-held devices  
Touch screen monitors  
Point-of-sale terminals  
Medical devices  
CONTROL  
30  
29  
AOUT  
ARNG  
DAC  
REGISTER  
TO  
GPIO1-3  
8-BIT  
DAC  
REGISTERS  
PEN INTERRUPT  
AND WAKE-UP  
ON TOUCH  
CONTROL LOGIC AND SERIAL PORT  
17  
PENIRQ  
18  
19  
23  
26  
27  
28  
CS DIN DAV DCLK DOUT  
V
DRIVE  
Figure 1.  
Cell phones  
Pagers  
GENERAL DESCRIPTION  
The AD7877 is a 12-bit successive approximation ADC with a  
synchronous serial interface and low on resistance switches for  
driving touch screens. The AD7877 operates from a single 2.7 V  
to 5.25 V power supply (functional operation to 2.2V), and  
features throughput rates of 125 kSPS. The AD7877 features  
direct battery measurement on two inputs, temperature and  
touch-pressure measurement.  
To reduce the effects of noise from LCDs, the acquisition phase  
of the on-board ADC can be controlled via the STOPACQ pin.  
User-programmable conversion controls include variable  
acquisition time and first conversion delay. Up to 16 averages  
can be taken per conversion. There is also an on-board DAC for  
LCD backlight or contrast control. The AD7877 can run in  
either slave or master mode, using a conversion sequencer and  
timer. It is ideal for battery-powered systems such as personal  
digital assistants with resistive touch screens and other portable  
equipment.  
The AD7877 also has an on-board reference of 2.5 V. When not  
in use, it can be shut down to conserve power. An external  
reference can also be applied and can be varied from 1 V to  
+VCC, while the analog input range is from 0 V to VREF. The  
device includes a shutdown mode, which reduces its current  
consumption to less than 1 µA.  
The part is available in a 32-lead lead frame chip scale package  
(LFCSP).  
Rev. A  
Information furnished by Analog Devices is believed to be accurate and reliable.  
However, no responsibility is assumed by Analog Devices for its use, nor for any  
infringements of patents or other rights of third parties that may result from its use.  
Specifications subject to change without notice. No license is granted by implication  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.326.8703  
www.analog.com  
© 2004 Analog Devices, Inc. All rights reserved.  

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