th July 2011 22 www.semtech.com SX8654/SX8655/SX8656 H" />
參數(shù)資料
型號(hào)： SX8654IWLTRT
廠商： Semtech
文件頁數(shù)： 15/62頁
文件大小： 0K
描述： IC TOUCH SCREEN 12BIT 20QFN
標(biāo)準(zhǔn)包裝： 1
類型： 電阻式，觸感驅(qū)動(dòng)器
觸摸面板接口： 4，5 線
輸入數(shù)/鍵： 1 TSC，雨刷，鑰匙
分辨率（位）： 12 b
評(píng)估套件： *
數(shù)據(jù)接口： I²C，串行
電壓基準(zhǔn)： 內(nèi)部
電源電壓： 2.3 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 20-QFN（4x4）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： SX8654IWLDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 25
th July 2011
22
www.semtech.com
SX8654/SX8655/SX8656
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
Figure 25 – Incorrect (too high) TOUCHRATE setting
In order to prevent this, one can estimate the maximum throughput achievable and set TOUCHRATE parameter
accordingly.
MaxThroughput = 1 / (Tconv+Tcom)
Tcom is the time between the end of conversion (ie NIRQ falling edge) and the end of channel data reading (i.e.
NIRQ rising edge). Maximum throughput implies that the host reacts “instantaneously” to NIRQ falling edge:
Tcom
8
16
Nchan
×
+
(
) TI2C
×
=
Tconv is the total conversion time:
Tconv us
( )
47 Tos c
N
+
c han
P OWD LY
N
f ilt
1
–
(
) SETDLY
21N
filt
1
+
(
) Tosc
+
+
(
)
=
- TI2C is the period of the I2C clock SCL
- Nfilt = {1,3,5,7} based on the order defined for the filter FILT
- Nchan = {1,2,3,4,5} based on the number of channels defined in RegChanMsk
- POWDLY = 0.5us to 18.19ms, settling time as defined in RegTS0
- SETDLY = 0.5us to 18.19ms, settling time when filtering as defined in RegTS2
- Tosc is the period of the internal oscillator FOSCH
Some examples of maximum throughputs achievable with an I2C running at 400kHz are given below.
Nchan
Nfilt
POWDLY
[us]
SETDLY
[us]
Tconv
[us]
Tcom
[us]
Total
[us]
CR
[kcps]
ECR
[kcps]
SR
[ksps]
ESR
[ksps]
2
1
0.5
51.7
100
151.7
6.6
13.2
6.6
13.2
2
3
35.5
0.5
170.6
100
270.6
3.7
7.4
11.1
22.2
2
5
2.2
0.5
152.8
100
252.8
4
8
20
40
4
3
35.5
0.5
315.0
200
515
1.9
7.6
5.7
22.8
Table 7 – Maximum Throughputs Examples
- CR = Coordinate Rate
- ECR = Equivalent Coordinate Rate = CR x Nchan
- SR = Sampling Rate = CR x Nfilt
- ESR = Equivalent Sampling Rate = SR x Nchan = CR x Nfilt x Nchan
For proper operation, the TOUCHRATE parameter should not exceed the theoretical maximum throughput CR.
Idle
Touch Conversion
Pen Detection
NIRQ
TOUCHRATE
tick
Not ready, tick ignored
I2C Read Channel
Tconv
Tcom
Trate
=
Trate < Tconv+Tcom < n.Trate
=> Actual rate = TOUCHRATE/n
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