参数资料
型号: AD7877ACPZ-REEL
厂商: Analog Devices Inc
文件页数: 15/45页
文件大小: 0K
描述: IC ADC 12BIT TOUCHSCREEN 32LFCSP
标准包装: 5,000
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,SPI?
数据速率/采样率 (SPS,BPS): 125k
电压基准: 外部,内部
电源电压: 2.7 V ~ 5.25 V
电流 - 电源: 1µA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ
包装: 带卷 (TR)
配用: EVAL-AD7877EBZ-ND - BOARD EVALUATION FOR AD7877
Data Sheet
AD7877
Rev. D | Page 21 of 44
Table 6. Codes for Selecting Input Channel and Normal or Ratiometric Conversion
Channel
SER/DFR
CHADD(3:0)
Analog Input
X Switches
Y Switches
+REF
REF
0
0 0 0 0
X+ (Y position)
Off
On
Y+
Y
1
0
0 0 0 1
Y+ (X position)
On
Off
X+
X
2
0
0 0 1 0
Y (Z2)
X+ off, X on
Y+ on, Y off
Y+
X
3
0
0 01 1
AUX1
Off
VREF
GND
4
0
0 1 00
AUX2
Off
VREF
GND
5
0
0 1 0 1
AUX3
Off
VREF
GND
6
0
0 1 1 0
BAT1
Off
VREF
GND
7
0
0 1 1 1
BAT2
Off
VREF
GND
8
0
1 0 0 0
TEMP1
Off
VREF
GND
9
0
1 0 0 1
TEMP2
Off
VREF
GND
10
0
1 0 1 0
X+ (Z1)
X+ OFF, X ON
Y+ on Y off
Y+
X
-
0
1 0 1 1
Invalid address
-
0
1 1 0 0
Invalid address
-
0
1 1 0 1
Invalid address
-
0
1 1 1 0
Invalid address
-
0
1 1 1 1
Invalid address
0
1
0 0 0 0
X+ (Y position)
Off
On
VREF
GND
1
0 0 0 1
Y+ (X position)
On
Off
VREF
GND
2
1
0 0 1 0
Y (Z2)
X+ off, X on
Y+ on, Y off
VREF
GND
3
1
0 0 1 1
AUX1
Off
VREF
GND
4
1
0 1 0 0
AUX2
Off
VREF
GND
5
1
0 1 0 1
AUX3
Off
VREF
GND
6
1
0 1 1 0
BAT1
Off
VREF
GND
7
1
0 1 1 1
BAT2
Off
VREF
GND
8
1
1 0 0 0
TEMP1
Off
VREF
GND
9
1
1 0 0 1
TEMP2
Off
VREF
GND
10
1
1 0 1 0
X+ (Z1)
X+ off, X on
Y+ on, Y off
VREF
GND
-
1
10 1 1
Invalid address
-
1
1 1 0 0
Invalid address
-
1
1 1 0 1
Invalid address
-
1
1 1 1 0
Invalid address
-
1
1 1 1 1
Invalid address
CONTROL REGISTER 2
Timer (Control Register 2, Bits[1:0])
The TMR bits in Control Register 2 enable the ADC to
repeatedly perform a conversion or conversion sequence either
once only or at intervals of 512 s, 1.024 ms, or 8.19 ms. In slave
mode, the timer starts as soon as the conversion sequence is
finished. In master mode, the timer starts at the end of a
conversion sequence only if the screen remains touched. If the
touch is released at any stage, then the timer stops and, the next
time the screen is touched, a conversion sequence begins
immediately.
Table 7. Control Register 2 Timer Selection
TMR1
TMR0
Function
0
Convert only once (default)
0
1
Every 1024 clocks (512 s)
1
0
Every 2048 clocks (1.024 ms)
1
Every 16,384 clocks (8.19 ms)
Int/Ext Reference (Control Register 2, Bit[2])
If the REF bit in Control Register 2 is 0 (default value), the
internal reference is selected. Buffer any connection made to
VREF while the internal reference is selected (for example, to
supply a reference to other circuits). An external power supply
should not be connected to this pin while REF is equal to 0,
because it might overdrive the internal reference. Because the
internal reference is 2.5 V, it operates only with supply voltages
down to 2.7 V. Below this value, use an external reference.
If the REF bit is 1, the VREF pin becomes an input and the
internal reference is powered down. This overrides any setting
of the PM bits with regard to the reference. An external
reference can then be applied to the REF pin.
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