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| 型号： | MAX11801EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/59页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL TOUCH SCREEN |
| 其它有关文件： | Automotive Product Guide |
| 标准包装： | 1 |
| 主要目的： | 接口，触摸屏控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MAX11801 |
| 主要属性： | 图形用户界面（GUI） |
| 次要属性： | USB，I2C接口 |
| 已供物品： | 板 |
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MAX11800–MAX11803
Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I2C/SPI Interface
20
______________________________________________________________________________________
power dissipation condition is observed when the point
of contact is in the top left corner of the panel sensor.
The planar end-to-end resistance included in the cur-
rent path is minimal at this location. Keep the averaging
and panel settling durations to the minimum required
by the application when pressure measurements are
required. Table 3 summarizes the physical panel set-
tings for supported measurement types.
Touch-Detect Modes and Options
Figure 6 shows the internal circuitry in the
MAX11800–MAX11803 used to detect the presence of
a touch on the panel. The selection of the pullup resis-
tance value (RTD = touch-detect resistance) and the
durations of the rough pullup interval (PUR = low-
impedance pullup) and fine pullup interval (PUF = high-
impedance pullup) are user-defined.
The MAX11800–MAX11803 revert to the low-power
panel setup when placed in touch-detect mode (TDM).
Figure 6 shows the active panel drive switches (YMSW
and XPSW are omitted for simplicity). TSW is a dedicat-
ed pullup switch used in TDM. TSW is also used during
PUF and TDM. XPSW is activated during PUR periods.
TDRSEL allows the selection of an internal pullup resis-
tor value of either 50k
Ω or 100kΩ.
The X and Y touch-screen plates create an open circuit
with no current flow in the panel when the panel is not
being touched. In this case, TOUCH (see Figure 6) is
low. When a touch causes contact between the panel X
and Y plates, a current path is created and TOUCH is
pulled high, as long as RPX + RPY (the sum of panel
end-to-end resistance) is much lower than RTD. Typical
open-circuit panel plate resistances range from 200
Ω
to 1000
Ω.
The MAX11800–MAX11803 enter high-impedance
pullup mode (50k
Ω or 100kΩ) when the panel is not
being touched. The device is idle in this mode until a
touch is detected. The YMSW and TSW transistors are
on, and the XPSW and PSW transistors are off. With no
touch present, the Y- input of the TSC is at ground and
the X+ input is at VDD - VTN, where VTN is the threshold
voltage of the TSW nMOS device. This is a low-power
mode in which no current is consumed until a panel
touch occurs. When a touch is present on the panel,
the touch-screen controller (TSC) X+ input is pulled low
by the touch panel plate resistance and the YMSW tran-
sistor. This causes TOUCH to assume a logic-high and
the devices either issue the TIRQ interrupt for direct
conversion modes (MAX11800–MAX11803) or begin
self-timed scans for autonomous conversion mode
(MAX11800/MAX11801).
The value of the user-defined RTD depends on the
characteristics of the panel. To ensure reliable
detection values, worst-case panel resistance must
be checked against RTD. The interaction between
RTD and the panel (or external noise rejecting)
capacitance determines how quickly the panel can
be switched from measurement modes back to
touch monitoring mode without reporting false
touches or erroneous tags due to panel settling.
Panel touch status is also required to tag data from a
completed scan and measurement operation. Following
each scan operation, the panel must be returned to
TDM to determine if the panel is still being touched and
if the data obtained during the scan operation should
be considered valid. This operation is required since
the panel cannot be monitored for the presence of a
touch during the scan and measurement procedure.
The MAX11800–MAX11803 must return to TDM after
completing a measurement and making a decision on
the touch status of the panel. The measurement proce-
dure is only completed upon resolution of the touch sta-
tus and when data is tagged and available for
readback. The characteristics of the return to TDM and
MODE
X+
X-
Y+
Y-
REF+
REF-
XVDD
GND
ADC_IN
U
X+
X-
Y
ADC_IN
U
VDD
GND
Y+
Y-
Z1
ADC_IN
GND
VDD
UY+
X-
Z2
U
GND
VDD
ADC_IN
Y+
X-
PUR
VDD (10
Ω)
U
GND
U
—
TDM or PUF
VDD through
50k
Ω or 100kΩ
U
GND
U
—
LPM
UUUUU
—
Table 3. Summary of Physical Panel Settings for Supported Measurement Types
Note: The ADC input is fully differential with the negative input internally connected to GND. The MAX11800–MAX11803 control
access to the PUR, PUF, TDM, and LPM, which do not require setup procedures.
U
indicates unconnected node.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX11801EVKIT+ | 功能描述:数据转换 IC 开发工具 MAX11801 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| MAX11801EWC+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX11801EWC+T | 功能描述:触摸屏转换器和控制器 I2C 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX11801GTC/V+ | 功能描述:触摸屏转换器和控制器 I2C 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MAX11801GTC/V+T | 功能描述:触摸屏转换器和控制器 I2C 4Ch Touch Screen Controller RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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