参数资料
型号: AD7889-1ACBZ-RL
厂商: Analog Devices Inc
文件页数: 21/41页
文件大小: 0K
描述: IC ADC 12BIT CTRLR TOUCH 12WLCSP
产品变化通告: 8mm Carrier Tape Changes 28/Feb/2012
标准包装: 10,000
类型: 电阻
触摸面板接口: 4 线
输入数/键: 1 TSC
分辨率(位): 12 b
数据接口: I²C,串行
数据速率/采样率 (SPS,BPS): 105k
电压基准: 外部
电源电压: 1.6 V ~ 3.6 V
电流 - 电源: 10nA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 12-UFBGA,WLCSP
供应商设备封装: 12-WLCSP
包装: 带卷 (TR)
AD7879/AD7889
Rev. C | Page 27 of 40
ADC Channel (Control Register 1, Bits[14:12])
The ADC channel address is selected by Bits[14:12] of Control
Register 1 (CHNL ADD2 to CHNL ADD0). A complete list of
channel addresses is given in Table 21.
For single-channel conversion, the channel address is selected
by writing the appropriate code to the CHNL ADD2 to CHNL
ADD0 bits in Control Register 1.
For sequential channel conversion, the channels to be converted
are selected by setting the bits corresponding to the channel
number in Control Register 3 for slave and master mode
sequencing.
For both single-channel and sequential conversion, a normal
conversion (single-ended) is selected by setting the SER/DFR
bit in Control Register 2 (Bit 9). Ratiometric (differential)
conversion is selected by clearing the SER/DFR bit.
PENIRQ Enable (Control Register 1, Bit 15)
The AD7879/AD7889 have a dual function output that performs
as PENIRQ or INT depending on the pen interrupt enable bit
(Bit 15 of Control Register 1). When this bit is set to 0, the pin
functions as a pen interrupt and goes low whenever the screen
is touched. When the pen interrupt enable bit is set to 1, the pen
interrupt request is disabled and the pin functions as an interrupt
when a measurement exceeds a preprogrammed limit (INT).
Table 21. Codes for Selecting Input Channel and Normal or Ratiometric Conversion
Channel
SER/DFR
CHNL ADD[2:0]
Analog Input
X Switches
Y Switches
REF+
REF
0
111
X+ (Y position)
Off
On
Y+
Y
1
0
110
Y+ (X position)
On
Off
X+
X
2
0
101
X+ (Z1 touch pressure)
X+ off, X on
Y+ on, Y off
Y+
X
3
0
100
Y (Z2 touch pressure)
X+ off, X on
Y+ on, Y off
Y+
X
4
0
011
AUX
Off
VCC
GND
5
0
010
VBAT
Off
VCC
GND
6
0
001
TEMP
Off
VCC
GND
0
000
Invalid address
7
1
111
X+ (Y position)
Off
On
VCC
GND
8
1
110
Y+ (X position)
On
Off
VCC
GND
9
1
101
X+ (Z1 touch pressure)
Off
VCC
GND
12
1
100
Y (Z2 touch pressure)
Off
VCC
GND
13
1
011
AUX
Off
VCC
GND
14
1
010
VBAT
Off
VCC
GND
15
1
001
TEMP
Off
VCC
GND
1
000
Invalid address
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