- 您现在的位置：买卖IC网 > PDF目录9712 > AD7877ACPZ-REEL7 (Analog Devices Inc)IC ADC 12BIT TOUCHSCREEN 32LFCSP PDF资料下载
参数资料
| 型号： | AD7877ACPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/45页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 32LFCSP |
| 标准包装： | 1,500 |
| 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，SPI? |
| 数据速率/采样率 (SPS，BPS)： | 125k |
| 电压基准： | 外部，内部 |
| 电源电压： | 2.7 V ~ 5.25 V |
| 电流 - 电源： | 1µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD7877EBZ-ND - BOARD EVALUATION FOR AD7877 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页
AD7877
Data Sheet
Rev. D | Page 24 of 44
0
3796-
018
YES
NO
ONCE-ONLY
MODE?
TIMER
FINISHED?
START TIMER
NO
YES
1SEE SEQUENCER REGISTERS SECTION.
LIMIT COMPARISON
START FCD TIMER
UPDATE ALERT
ENABLE/STATUS
REGISTER
CONVERT
SELECTED CHANNEL
IS FCD
FINISHED?
NO
YES
NO
YES
NO
YES
NO
IS AVERAGING
FINISHED?
WRITE RESULT TO
REGISTERS
ALERT
SOURCE
ENABLED?
IS ACQUISITION
TIME FINISHED?
IS FCD
REQUIRED?
START ACQUISITION TIMER
OUT-OF-LIMIT?
ASSERT ALERT
OUTPUT1
YES
NO
YES
NO
VALID
SEQUENCE 1?
SELECT NEXT
CHANNEL
GO TO MODE 00
LAST CHANNEL
IN SEQUENCE?
YES
IS
SCREEN
TOUCHED?
NO
YES
NO
IS STOPACQ
SIGNAL ACTIVE?
IS STOPACQ
SIGNAL ACTIVE?
NO
YES
NO
IS
SCREEN STILL
TOUCHED?
YES
IS
SCREEN STILL
TOUCHED?
YES
NO
HOST PROGRAMS
AD7877 IN MODE 11
Figure 40. Master Mode Sequencer Operation
INTERRUPTS
Data Available Output (DAV)
The data available output (DAV) indicates that new ADC data
is available in the results registers. While the ADC is idle or is
converting, DAV is high. Once the ADC has finished converting
and new data has been written to the results registers, DAV goes
low. Taking DAV low to read the registers resets DAV to a high
condition. DAV is also reset, if a new conversion is started by
the AD7877 because the timer expired. The host should attempt
to read the results registers only when DAV is low.
03796-019
CS
DAV
AD7877
STATUS
IDLE
SETUP
BY HOST
ADC
CONVERTING
NEW DATA
AVAILABLE
HOST READS
RESULTS
IDLE
tCONV
Figure 41. Operation of DAV Output
DAV is useful as a host interrupt in master mode. In this mode,
the host can program the AD7877 to automatically perform a
sequence of conversions, and can be interrupted by DAV at the
end of each conversion sequence.
When the on-board timer is programmed to perform automatic
conversions, a limited time is available to the host to read the
results registers before another sequence of conversions begins.
The DAV signal is reset high when the timer expires, and the
host should not access the results registers while DAV is high.
Figure 42 shows the worst-case timings for reading the results
registers after DAV has gone low. The timer is set at a
minimum, and the conversion sequence includes all 11 possible
ADC channels. t1 is the time taken for acquisition and
conversion on one ADC channel. t2 shows the minimum timer
delay, that is, 1024 clock periods. t3 is the time taken to read all
11 result registers. If the host wants to read all 11 registers, then
it must do so before the timer expires. t4 is the maximum time
allowable between DAV going low and the host beginning to
read the results registers. If t4 is exceeded, then all registers
cannot be read before the start of a new conversion, and
incorrect data could be read by the host.
03796-020
DOUT
AD7877
STATUS
CHANNEL 11
CONVERSION AND
ACQUISITION
TIMER INTERVAL
CHNL
1
t1
t2
t3
t4
CS
DAV
Figure 42. Timing for Reads after DAV Goes Low
相关PDF资料 |
PDF描述 |
|---|---|
| SSTV16857CG | IC REGIST BUFF 14BIT DDR 48TSSOP |
| MS27497T24B35SC | CONN RCPT 128POS WALL MNT W/SCKT |
| AD7877ACBZ-REEL | IC CTRLR TOUCH SCREEN 25-WLCSP |
| MS27497E24F35S | CONN RCPT 128POS WALL MNT W/SCKT |
| MS3106R32-17PY | CONN PLUG 4POS STRAIGHT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7877WACPZ-REEL7 | 功能描述:IC CTRLR TOUCH SCREEN 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 触摸屏控制器 系列:- 标准包装:96 系列:- 类型:- 触摸面板接口:- 输入数/键:- 分辨率（位）:- 评估套件:* 数据接口:- 数据速率/采样率 (SPS，BPS):- 电压基准:- 电源电压:- 电流 - 电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| AD7878 | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface |
| AD7878AQ | 制造商:Rochester Electronics LLC 功能描述:COMPLETE 12 BIT ADC IC - Bulk |
| AD7878BQ | 功能描述:IC ADC 12BIT W/DSP INT 28-CDIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率（每秒）:1.8M 数据接口:并联 转换器数目:1 功率耗散（最大）:1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP（7x7） 包装:管件 输入数目和类型:2 个单端，单极 |
| AD7878JN | 制造商:Analog Devices 功能描述:ADC Single SAR 100ksps 12-bit Parallel 28-Pin PDIP W 制造商:Rochester Electronics LLC 功能描述:COMPLETE 12 BIT ADC IC - Bulk 制造商:Analog Devices 功能描述:LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface |
发布紧急采购，3分钟左右您将得到回复。