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參數(shù)資料
| 型號： | SX8652IWLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 7/29頁 |
| 文件大小： | 0K |
| 描述： | IC TOUCH SCREEN CTRLR 14DFN |
| 標準包裝： | 1 |
| 類型： | 電阻 |
| 觸摸面板接口： | 4 線，5 線 |
| 輸入數(shù)/鍵： | 2 鍵 |
| 分辨率（位）： | 12 b |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 數(shù)據(jù)速率/采樣率 (SPS，BPS)： | 74k |
| 電壓基準： | 內(nèi)部 |
| 電源電壓： | 1.65 V ~ 3.7 V |
| 電流 - 電源： | 10mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 14-DFN |
| 包裝： | 標準包裝 |
| 其它名稱： | SX8652IWLDKR |
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Revision V1.7/October 2010
2010 Semtech Corp.
SX8652
www.semtech.com
Page 15
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
6. Data Processing
The SX8652 offers 4 types of data processing which allows the user to make trade-offs between data throughput, power
consumption and noise rejection. The parameter FILT is used to select the filter order Nfilt as seen in Table 8.
The sn samples from the ADC can be averaged. The processed cn 12-bit value is then send through the SPI bus.
The noise rejection will be improved with a high order to the detriment of the power consumption.
The K coefficient in Table 8 is a filter constant. Its value is K=4079/4095.
Table 8. Filter order
7. Power-Up, Reset
During power-up, NIRQ pin is kept low, the POR reset all
registers and states of the SX8652. The SX8652 is not
accessible and SPI communications are ignored.
As soon as NIRQ rises, the SX8652 is in manual mode with
only
the
SPI
peripheral
enabled
to
minimize
power
consumption.
The host can reset the SX8652 by setting the NRST pin low or
via the SPI bus. Writing the code 0xDE to the register
RegSoftReset reset the circuit.
When NRST is driven LOW by the host, NIRQ will be driven low
by the SX8652. After the reset NIRQ will be released by the
SX8652.
Figure 13. Power-up, NIRQ
8. Modes of Operation
The SX8652 has four operation modes that are configured using the SPI commands as defined in Table 13 and Table 15.
These 4 modes are:
manual (command ‘MANAUTO’ and RATE=0),
automatic (command ‘MANAUTO’ and RATE>0),
pen detect (command ‘PENDET’),
pen trigger mode (command ‘PENTRG’).
FILT
Nfilt
Explanation
Processing
0
1
No average
1
3
3 ADC samples are averaged
2
5
5 ADC samples are averaged
3
7
7 ADC samples are sorted and
the 3 center samples are
averaged
s
n
c
n
=
s
n
1
3
---K c
n
c
n
1
–
c
n
2
–
+
(
)
=
s
n
1
5
---K c
n
c
n
1
–
c
n
2
–
c
n
3
–
c
n
4
–
+
(
)
=
c
max1
c
max2
c
a
c
b
c
min1
c
min2
≥
s
n
1
3
---K c
a
c
b
c
+
(
)
=
voltage
time
voltage
time
VDD
NIRQ
t POR
VDD/2
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相關代理商/技術(shù)參數(shù) |
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| SX8653 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
| SX8653ICSTRT | 制造商:Semtech Corporation 功能描述: |
| SX8653ICSTRT1 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
| SX8653IWLTRT | 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:TAPE & REEL 4/5 WIRE RESISTIVE TOUCH |
| SX8653IWLTRT1 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller with SPI Interface |
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