- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄364590 > AB-142 AB-142 - ADS7843 PEN INTERRUPT PDF資料下載
參數(shù)資料
| 型號(hào)： | AB-142 |
| 英文描述： | AB-142 - ADS7843 PEN INTERRUPT |
| 中文描述： | 抗體- 142 - ADS7843筆中斷 |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 50K |
| 代理商： | AB-142 |
1998 Burr-Brown Corporation
AB-142A
Printed in U.S.A. April, 1999
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
ADS7843 PEN INTERRUPT
By Ken Dietz
The ADS7843 is a 12-bit sampling analog-to-digital con-
verter (ADC) used to drive 4-wire touch-screens to serial
interfaces by ratiometrically converting two differential in-
put signals. The ADS7843 also produces an accurate output
with the first conversion cycle once powered up. Because of
this feature, the ADC can be powered up and down continu-
ously, thus, enabling designers to conserve energy in low
power applications such as Personal Digital Assistants (PDA),
where the number of conversions is limited but a fast and
accurate response is required on the first conversion. To
maximize energy conservation, the ADS7843 incorporates a
Pen Interrupt Request feature (PENIRQ), which enables
designers to fully control the power-down operation when
interfacing with Micoprocessors (MPU). Figure 1 is a sim-
plified flow diagram for a PDA showing how PENIRQ is
used to assist in controlling power-down operations.
FIGURE 1. Simplified Flow Diagram for PDA.
Sanity
Is pen writing
MPU processes data
MPU sends byte to
ADS7843 (PD0 = PD1 = 0)
ADS7843 powered-down
and PENIRQ enabled
PENIRQ pulled LOW
(typically 0.65V)
PENIRQ at high voltage
Pen depresses touch-screen
MPU senses low voltage
and wakes up
MPU pulls PENIRQ LOW, writes
to ADS7843 to initiate conversion
Yes
No
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AB-143 | AB-143 - Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture |
| AB-144 | AB-144 - NEW SOFTWARE FOR THE DDC112 EVALUATION FIXTURE |
| AB-146 | AB-146 - USING THE ADS1201 EVALUATION BOARD |
| AB-147 | AB-147 - Control Port and Reset Operation for Burr-Brown SoundPlus Audio Converters and CODECs |
| AB-148 | AB-148 - Low Sampling Rate Operation For Burr-Brown SoundPlus Audio Data Converters And CODECs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AB-143 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AB-143 - Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture |
| AB1431818MHZ | 制造商:ABRACON 功能描述:HC-49 制造商:ABRACON 功能描述:SEE INTERNIAL COMMENT |
| AB-143B0-12V0-G40-B | 制造商:A-BRIGHT 制造商全稱:A-BRIGHT Inc 功能描述:14 LAMPS LED BULB |
| AB-143B0-12V0-G40-B_09 | 制造商:A-BRIGHT 制造商全稱:A-BRIGHT Inc 功能描述:14 Lamps LED Bulb |
| AB-143G0-12V0-G40-B | 制造商:A-BRIGHT 制造商全稱:A-BRIGHT Inc 功能描述:14 LAMPS LED BULB |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。