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参数资料
| 型号： | AD7843ARUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/21页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT TOUCHSCREEN 16TSSOP |
| 标准包装： | 1,000 |
| 类型： | 电阻 |
| 触摸面板接口： | 4 线 |
| 输入数/键： | 1 TSC |
| 分辨率（位）： | 12 b |
| 评估套件： | 可供 |
| 数据接口： | 串行 |
| 数据速率/采样率 (SPS，BPS)： | 125k |
| 电压基准： | 外部 |
| 电源电压： | 2.2 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
| 配用： | EVAL-AD7843EBZ-ND - BOARD EVAL FOR AD7843 |
AD7843
Rev. B | Page 14 of 20
CONTROL REGISTER
The control word provided to the ADC via the DIN pin is
shown in Table 6. This provides the conversion start, channel
addressing, ADC conversion resolution, configuration, and
power-down of the AD7843.
Table 6 provides detailed information on the order and
description of these control bits within the control word.
Initiate START
The first bit, the S bit, must always be set to 1 to initiate the start
of the control word. The AD7843 ignores any inputs on the DIN
line until the START bit is detected.
Channel Addressing
The next three bits in the control register, A2, A1, and A0, select
the active input channel(s) of the input multiplexer (see Table 5
and Figure 19), touch screen drivers, and the reference inputs.
MODE
The MODE bit sets the resolution of the analog to digital
converter. With 0 in this bit, the following conversion has 12 bits
of resolution. With 1 in this bit, the following conversion has 8
bits of resolution.
SER/DFR
The SER/DFR bit controls the reference mode, which can be
either single-ended or differential if 1 or 0 is written to this bit,
respectively. The differential mode is also referred to as the
ratiometric conversion mode. This mode is optimum for
X-position and Y-position measurements. The reference is
derived from the voltage at the switch drivers, which is almost
the same as the voltage to the touch screen. In this case, a
separate reference voltage is not needed because the reference
voltage to the ADC is the voltage across the touch screen. In
single-ended mode, the reference voltage to the converter is
always the difference between the VREF and GND pins. See
information.
Because the supply current required by the device is so low, a
precision reference can be used as the supply source to the
AD7843. It may also be necessary to power the touch screen
from the reference, which could require 5 mA to 10 mA. A
REF19x voltage reference can source up to 30 mA and, as such,
could supply both the ADC and the touch screen. Care must be
taken, however, to ensure that the input voltage applied to the
ADC does not exceed the reference voltage and therefore the
supply voltage. See the Absolute Maximum Ratings section.
Note that the differential mode can only be used for X-position
and Y-Position measurements. All other measurements require
single-ended mode.
PD0 and PD1
The power management options are selected by programming
the power management bits, PD0 and PD1, in the control
register. Table 7 summarizes the available options. On power-up,
PD0 defaults to 0, while PD1 defaults to 1..
Table 6. Control Register Bit Function Description
MSB
LSB
S
A2
A1
A0
MODE
SER/DFR
PD1
PD0
Bit
Mnemonic
Comment
7
S
Start Bit. The control word starts with the first high bit on DIN. A new control word can start every 15th DCLK cycle
when in the 12-bit conversion mode, or every 11th DCLK cycle when in 8-bit conversion mode.
6–4
A2–A0
Channel Select Bits. These three address bits, along with the SER/DFR bit, control the setting of the multiplexer input,
switches, and reference inputs, as described in Table 5.
3
MODE
12-Bit/8-Bit Conversion Select Bit. This bit controls the resolution of the following conversion. With 0 in this bit, the
conversion has a 12-bit resolution, or with 1 in this bit, the conversion has a 8-bit resolution.
2
SER/DFR
Single-Ended/Differential Reference Select Bit. Along with Bits A2–A0, this bit controls the setting of the multiplexer
input, switches, and reference inputs, as described in Table 5.
1, 0
PD1, PD0
Power Management Bits. These two bits decode the power-down mode of the AD7843, as shown in Table 7.
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