參數(shù)資料
型號(hào)： ADS7846IRGVT
英文描述： TOUCH-SCREEN CONTROLLER
中文描述： 觸摸屏控制器
文件頁(yè)數(shù)： 9/23頁(yè)
文件大?。?/td> 520K
代理商： ADS7846IRGVT
ADS7846
SBAS125H
9
www.ti.com
INTERNAL REFERENCE
The ADS7846 has an internal 2.5V voltage reference that can
be turned on or off with the control bit, PD1 = 1 (see Table V and
Figure 3). Typically, the internal reference voltage is only used
in the single-ended mode for battery monitoring, temperature
measurement, and for using the auxiliary input. Optimal touch
screen performance is achieved when using the differential
mode. The internal reference voltage of the ADS7846 must be
commanded to be off to maintain compatibility with the ADS7843.
Therefore, after power-up, a write of PD1 = 0 is required to
insure the reference is off (see the Typical Characteristics for
power-up time of the reference from power-down).
REFERENCE INPUT
The voltage difference between +REF and
–
REF (shown in
Figure 2) sets the analog input range. The ADS7846 oper-
ates with a reference in the range of 1V to +V
CC
. There are
several critical items concerning the reference input and its
wide voltage range. As the reference voltage is reduced, the
analog voltage weight of each digital output code is also
reduced. This is often referred to as the LSB (least significant
bit) size and is equal to the reference voltage divided by 4096
in 12-bit mode. Any offset or gain error inherent in the ADC
appears to increase, in terms of LSB size, as the reference
voltage is reduced. For example, if the offset of a given
converter is 2LSBs with a 2.5V reference, it is typically
5LSBs with a 1V reference. In each case, the actual offset of
the device is the same, 1.22mV. With a lower reference
FIGURE 2. Simplified Diagram of Analog Input.
Converter
–
REF
+REF
+IN
–
IN
V
BAT
AUX
Battery
On
GND
A2-A0
(Shown 001
B
)
2.5V
Reference
Ref On/Off
SER/DFR
(Shown High)
X+
X
–
+V
CC
TEMP1
PENIRQ
Y+
Y
–
V
REF
TEMP0
7.5k
2.5k
Buffer
Band
Gap
Reference
Power Down
To
CDAC
Optional
V
REF
FIGURE 3. Simplified Diagram of the Internal Reference.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7846IRGVT 制造商:Texas Instruments 功能描述:IC CONTROLLER TOUCH SCREEN SMD 制造商:Texas Instruments 功能描述:IC, CONTROLLER, TOUCH SCREEN, SMD
ADS7846IRGVTG4 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller 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
ADS7846IZQCR 制造商:Texas Instruments 功能描述:
ADS7846N 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller 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
ADS7846N/2K5 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller 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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