參數(shù)資料
型號(hào): QT60160-ATG
廠商: Atmel
文件頁(yè)數(shù): 3/26頁(yè)
文件大小: 0K
描述: IC TOUCH SENSOR 16KEY 32QFN
標(biāo)準(zhǔn)包裝: 3,000
系列: QMatrix™
類型: 電容性
輸入數(shù)/鍵: 16
分辨率(位): 10 b
評(píng)估套件: 可供
數(shù)據(jù)接口: I²C,串行,SPI?
電壓基準(zhǔn): 外部
電源電壓: 1.8V,3.3V,5V
電流 - 電源: 4.6mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN
供應(yīng)商設(shè)備封裝: 32-QFN
包裝: 帶卷 (TR)
其它名稱: QT60160-ATG-ND
QT60160-ATGTR
3.4 CHANGE Pin
Pin 2 (CHANGE) is an active-high output that can be used to
alert the host to key touches or key releases, thus reducing
the need for wasteful I2C communications. Normally, the host
can simply not bother to communicate with the device, except
when the CHANGE pin goes high.
CHANGE becomes active only when there is a change in key
state (either touch or touch release); CHANGE goes low
again only when the host performs a read from address 1, the
detect status register for all keys on Y0. CHANGE does not
self-clear; only an I2C read from location 1 will cause it to
clear.
It is important to read all three key state addresses to ensure
the host has a complete picture of which keys have changed.
In Shift Register mode the CHANGE pin does not operate
and should be left open.
Every key can be individually configured to wake a host
microcontroller upon a touch change; so, a product can wake
from sleep when any key state changes, or only when certain
desired keys change state. The configuration is set in the
Setups block (Section 6.13) on a key-by-key basis.
lQ
11
QT60240-ISG R8.06/0906
Figure 3.2 Shift Register Cycle
Key 0
Key 1
Key 2
Key 21
Key 22
Key 23
Key Scan
SCL
SDA
LATCH
tSCH
tSCL
Key 0
Key 3
Key 4
Key 23
tLATCH
tSDA-SCL
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