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参数资料
| 型号： | AD7879-1WACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/41页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT CTRLR TOUCH 16LFCSP |
| 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： | * |
| 数据接口： | I²C，串行 |
| 数据速率/采样率 (SPS，BPS)： | 105k |
| 电压基准： | 内部 |
| 电源电压： | 1.6 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ EP（4x4） |
| 包装： | 带卷 (TR) |
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AD7879/AD7889
Rev. C | Page 20 of 40
CONVERSION TIMING
Conversion timing or update rate is the rate at which the
AD7879 provides converted values from the ADC so that the
XY positions in the touch screen can be updated. In other
words, the update rate is the timing required to give valid
measurements in the sequencer.
Figure 29 shows conversion timing for a conversion sequence.
F
C
D
TMEASURE
F
C
D
TMEASURE
F
C
D
TMEASURE
F
C
D
F
C
D
TMEASURE TMEASURE TMEASURE
X+
× M
Y+
Z1
Z2
VBAT/AUX
TEMP
07667-
046
Figure 29. Conversion Timing Sequence
FCD is required before each touch screen measurement (X+,
Y+, Z1, and Z2). This time is required to allow the screen inputs
to settle before converting. If the sequence does not contain any
screen channel (VBAT, AUX, or TEMP), only one FCD is added
at start of the sequence. At the end of the sequence, there is
always another FCD.
TMEASURE is the time required to perform one measurement in
the conversion sequence.
TMEASURE = [ACQ (2 μs, 4 μs, 8 μs, 16 μs) + TCONV (7.5 μs) + TSORT
(2 μs)]
where:
ACQ is the acquisition time which is programmable in Control
Register 1. For temperature measurements, ACQ is fixed at 16 μs.
TCONV (typical ADC conversion time) is specified at 7.5 μs.
TSORT is the time needed to sort the new sample within the
median filter array. The TSORT value is approximately 2 μs. If a
median filter is not used (MED =0), the TSORT value is 0.
TMEASURE_MIN = 9.5 μs (ACQ = 2 μs, no median filter)
Conversion time per channel depends on the number of
samples to be converted. The number of samples is pro-
grammed using the following median filter settings:
TCHANNEL = TMEASURE × MED
TCHANNEL_MIN =9.5 μs (ACQ = 2 μs, MED = 0)
TCHANNEL_MAX = 376 μs (ACQ = 16 μs, MED = 16)
Update Rate = [FCD + (TMEASURE × MED)] × N + FCD + TMR
where:
N = number of channels to be measured (1 to 6).
MED = median filter setting (1, 4, 8, 16).
TMR = timer setting (0 μs to 9.4 ms).
The total update rate depends on the median filter settings and
the number of channels in the conversion sequence. The timer
setting (TMR) allows the user more flexibility to program the
update rate.
For example, if
ACQ = 4 us
MED = 8
N = 2
FCD = 1.024 ms
TMR = 620 μs
TMEASURE = 4 + 7.5 + 2 = 13.5 μs
TCHANNEL = (13.5 × 8) = 108 μs
Then
Update rate = [1024 + 108] × 2 + 1024 + 620 = 3.9 ms
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相关代理商/技术参数 |
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| AD7879-1WARUZ-RL | 功能描述:IC ADC 12BIT CTRLR TOUCH 16TSSOP 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) |
| AD7879-1WARUZ-RL7 | 功能描述:IC ADC 12BIT CTRLR TOUCH 16TSSOP 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) |
| AD7879ACBZ-500R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Controller for Touch Screens |
| AD7879ACBZ-RL | 制造商:Analog Devices 功能描述: |
| AD7879ACPZ-500R7 | 制造商:Analog Devices 功能描述:TOUCH SCREEN CONTROLLER - Tape and Reel 制造商:Analog Devices 功能描述:ADC 12BIT 3.6V 105KSPS SPI 16LFCSP 制造商:Analog Devices 功能描述:ADC, 12BIT, 3.6V, 105KSPS, SPI, 16LFCSP 制造商:Analog Devices 功能描述:ADC, 12BIT, 3.6V, 105KSPS, SPI, 16LFCSP; Resolution (Bits):12bit; Sampling Rate:105kSPS; Digital IC Case Style:LFCSP; No. of Pins:16; Input Channel Type:Single Ended; Data Interface:SPI; Operating Temperature Min:-40C; Operating ;RoHS Compliant: Yes |
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