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參數(shù)資料
| 型號(hào)： | MXB7846 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | H-BRIDGE PWR MOSFET CONTROLLER |
| 中文描述： | 2.375V至5.25V、4線觸摸屏控制器，內(nèi)置電壓基準(zhǔn)及溫度傳感器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 967K |
| 代理商： | MXB7846 |
M
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
______________________________________________________________________________________
17
Data Format
The MXB7846 output data is in straight binary format as
shown in Figure 12. This figure shows the ideal output
code for the given input voltage and does not include
the effects of offset, gain, or noise.
Applications Information
Basic Operation of the MXB7846
The 4-wire touch-screen controller works by creating a
voltage gradient across the vertical or horizontal resis-
tive network connected to the MXB7846, as shown in
the
Typical Application Circuit
. The touch screen is
biased through internal MOSFET switches that connect
each resistive layer to V
DD
and ground on an alternate
basis. For example, to measure the Y position when a
pointing device presses on the touch screen, the Y+
and Y- drivers are turned on, connecting one side of
the vertical resistive layer to V
DD
and the other side to
ground. In this case, the horizontal resistive layer func-
tions as a sense line. One side of this resistive layer
gets connected to the X+ input, while the other side is
left open or floating. The point where the touch screen
is pressed brings the two resistive layers in contact and
forms a voltage-divider at that point. The data converter
senses the voltage at the point of contact through the
X+ input and digitizes it. The horizontal layer resistance
does not introduce any error in the conversion because
no DC current is drawn.
The conversion process of the analog input voltage to
digital output is controlled through the serial interface
between the A/D converter and the μP. The processor
controls the MXB7846 configuration through a control
byte (see Tables 3 and 4). Once the processor instructs
1
8
16
1
8
16
DCLK
CONTROL BYTE 0
CONTROL BYTE 1
S
S
CONVERSION RESULT 0
CONVERSION RESULT 1
B11 B10 B9 B8 B7 B6
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
DIN
DOUT
BUSY
. . .
. . .
. . .
. . .
. . .
CS
Figure 11. 16-Clock/Conversion Timing
1
8
15
1
8
15
1
DCLK
DIN
DOUT
BUSY
S
CONTROL BYTE 0
CONTROL BYTE 1
CONTROL BYTE 2
S
S
CONVERSION RESULT 0
CONVERSION RESULT 1
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
CS
Figure 10. 15-Clock/Conversion Timing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MXB7846EEE | MOSFET Driver IC; Package/Case:28-TSSOP; Fall Time, tf:70ns; High Side MOSFET Drive Type:On-Chip Charge Pump; Leaded Process Compatible:Yes; Load Capacitance:3300pF; Load Voltage Max:40V; MOSFET Driver Type:Quad Drivers, Full Bridge RoHS Compliant: Yes |
| MXB7846EUE | 2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor |
| MXD1005PA__ | 5-Tap Silicon Delay Line |
| MXD1005PD__ | 5-Tap Silicon Delay Line |
| MXD1005SA__ | 5-Tap Silicon Delay Line |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MXB7846EEE | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EEE+ | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EEE+T | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EEE-T | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| MXB7846EUE | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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