參數(shù)資料
型號(hào): MAX11800EVKIT+
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 18/59頁(yè)
文件大小: 0K
描述: KIT EVAL TOUCH SCREEN
其它有關(guān)文件: Automotive Product Guide
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,觸摸屏控制器
嵌入式:
已用 IC / 零件: MAX11800
主要屬性: 圖形用戶界面(GUI)
次要屬性: USB,SPI 接口
已供物品:
Edge Interrupt Mode
When a touch is present on the panel in edge interrupt
mode, the MAX11800–MAX11803 return to an untimed
high-impedance mode once data tagging operations are
complete. In edge interrupt mode, the duration of a touch
is determined by the tags applied to the measurement
data. Data tagged as initial (00) or midpress (01) indicates
the user needs to continue to scan the panel until a
release is observed. In this state, there is no need to con-
tinue monitoring the touch status prior to the next request-
ed measurement. If a panel touch is not present, data is
tagged as release (10) and the MAX11800–MAX11803
idle in TDM continuously, issuing an interrupt only when
the next panel touch is initiated.
The operation described in the preceding paragraph
makes the edge interrupt mode more power-efficient
than the continuous interrupt mode. However, the edge
interrupt mode requires continuous scanning of the
panel until a release (10) event is observed. Otherwise,
the MAX11800–MAX11803 do not idle in TDM and are
not able to recognize a change in touch status. New
touches are not recognized and new interrupts are not
issued if a release event is not detected before stop-
ping the conversion sequence.
MAX11800–MAX11803
Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I2C/SPI Interface
______________________________________________________________________________________
25
Z1
ACQUIRE
Z2
ACQUIRE
TOUCH
DETECT
TOUCH-
DETECT
FINE
PULLUP
TOUCH-
DETECT
FINE
PULLUP
TIME IS UP
SETUP
X
PANEL
Y
ACQUIRE
X
DETECT
AUX
ACQUIRE
AVERAGE
CONVERSION
LAST
CONVERSION
NOT
LAST
O
R
CONTINUOUS
LAST
AND
NOT
CONTINUOUS
NOT
LAST
OR
CONTINUOUS
LAST
AND
NOT
CONTINUOUS
TIME IS UP
DONE AND
CONTINUOUS
DONE AND
CONTINUOUS
AVERAGE
CONVERSION
LAST
CONVERSION
NO
COMMAND
NO
COMMAND
NO
COMMAND
USER COMMAND
INTERNAL TRANSITION
SETUP
Y
PANEL
SETUP
Z
PANEL
Figure 8. State Machine Transitions (Direct Conversion Mode)—MAX11800–MAX11803
MEASUREMENT
MTAG[3:2]
X
00
Y
01
Z1
10
Z2
11
EVENT
ETAG[1:0]
Touch (data valid)
00
N/A (not used)
01
No touch present (data invalid)
10
Measurement in progress (data invalid)
11
Table 6. Measurement and Event Tags
(Continuous Interrupt Mode)
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