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AD7877ACBZ-REEL

更新时间： 2024-11-23 21:11:43
品牌 Logo 应用领域
亚德诺 - ADI 商用集成电路
页数 文件大小 规格书
46页 817K
描述
SPECIALTY CONSUMER CIRCUIT, PBGA25, 2.50 X 2.80 MM, ROHS COMPLIANT, WLCSP-25

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AD7877ACBZ-REEL 数据手册

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Touch Screen Controller  
Data Sheet  
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  
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  
AD7877  
12  
10  
13  
11  
X+  
X–  
Y+  
Y–  
X– Y– GND X+ Y+  
V
REF  
DUAL 3-1  
MUX  
6
5
4
AUX1/GPIO1  
AUX2/GPIO2  
AUX3/GPIO3  
REF–  
REF+  
CLOCK  
9 TO 1  
INPUT  
MUX  
12-BIT SUCCESSIVE  
APPROXIMATION ADC  
WITH TRACK-AND-HOLD  
IN  
3
BAT1  
BATTERY  
MONITOR  
SEQUENCER  
STOP  
20  
ACQ  
STOPACQ  
Touch-pressure measurement  
Wake up on touch function  
LOGIC  
2
BAT2  
RESULTS  
REGISTERS  
BATTERY  
MONITOR  
LIMIT  
COMPARATOR  
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 × 5 mm package  
25-ball,WLCSP, 2.5 mm × 2.8 mm package  
Qualified for automotive applications  
14  
15  
AGND  
DGND  
LIMIT  
REGISTERS  
TEMPERATURE  
SENSOR  
31  
V
REF  
ALERT STATUS/  
MASK REGISTER  
ALERT  
LOGIC  
22  
21  
ALERT  
GPIO4  
2.5V  
REF  
BUF  
GPIO  
REGISTERS  
CONTROL  
REGISTERS  
30  
29  
AOUT  
ARNG  
DAC  
REGISTER  
TO  
GPIO1-3  
8-BIT  
DAC  
PEN INTERRUPT  
AND WAKE-UP  
ON TOUCH  
CONTROL LOGIC AND SERIAL PORT  
17  
PENIRQ  
APPLICATIONS  
18  
19  
23  
26  
27  
28  
Personal digital assistants  
Smart hand-held devices  
Touch screen monitors  
Point-of-sale terminals  
Medical devices  
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 2.2 V), 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 is 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 back-  
light or contrast control. The AD7877 runs 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 varied from 1 V to +VCC, with  
an analog input range of 0 V to VREF. The device includes a  
shutdown mode that reduces its current consumption to less  
than 1 µA.  
The part is available in a 32-lead lead frame chip scale package  
(LFCSP), and a 25-ball wafer level chip scale package (WLCSP).  
Rev. E  
Document Feedback  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks 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 ©2004–2014 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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