參數(shù)資料
型號： EVAL-AD7879EBZ
廠商： Analog Devices Inc
文件頁數(shù)： 41/41頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7879
標準包裝： 1
主要目的： 接口，觸摸屏控制器
嵌入式： 否
已用 IC / 零件： AD7879
主要屬性： 4 線電阻式觸控屏控制器，I²C 和 SPI 接口
次要屬性： 圖形用戶界面，USB 接口
已供物品： 板，線纜，CD，觸控屏
AD7879/AD7889
Rev. C | Page 8 of 40
07667-
007
PIN 1
INDICATOR
1
Y+
2
NC
3
NC
4
X–
11 NC
12
10 NC
9
DOUT
5
Y–
6
DI
N
7
G
ND
8
SCL
15
V
CC
/RE
F
16
X+
14
13
AUX
/V
B
A
T/GP
IO
AD7879
TOP VIEW
(Not to Scale)
PENIRQ/INT/DAV
CS
NOTES
1. NC = NO CONNECT
2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY.
FOR INCREASED RELIABILITY OF THE SOLDER JOINTS
AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED
THAT THE PAD BE SOLDERED TO THE GROUND PLANE.
Figure 7. AD7879 LFCSP Pin Configuration
07667-
008
PIN 1
INDICATOR
1
Y+
2
NC
3
NC
4
X–
11 NC
12
10 NC
9
SDA
5
Y–
6
ADD1
7
G
ND
8
SCL
15
V
CC
/RE
F
16
X+
14
13
AUX
/V
B
A
T/GP
IO
AD7879-1
TOP VIEW
(Not to Scale)
PENIRQ/INT/DAV
ADD0
NOTES
1. NC = NO CONNECT
2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY.
FOR INCREASED RELIABILITY OF THE SOLDER JOINTS
AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED
THAT THE PAD BE SOLDERED TO THE GROUND PLANE.
Figure 8. AD7879-1 LFCSP Pin Configuration
Table 7. Pin Function Descriptions, LFCSP
Pin No.
Mnemonic
Description
AD7879
AD7879-1
1
Y+
Touch Screen Input Channel.
2, 3, 10, 11
NC
No Connect.
4
X
Touch Screen Input Channel.
5
Y
Touch Screen Input Channel.
6
N/A
DIN
SPI Serial Data Input to the AD7879.
N/A
6
ADD1
I2C Address Bit 1 for the AD7879-1. This pin can be tied high or low to determine an address
for the AD7879-1 (see Table 25).
7
GND
Ground. Ground reference point for all circuitry on the AD7879. All analog input signals and
any external reference signal should be referred to this voltage.
8
SCL
Serial Interface Clock Input.
9
N/A
DOUT
SPI Serial Data Output for the AD7879.
N/A
9
SDA
I2C Serial Data Input and Output for the AD7879-1.
12
PENIRQ/INT/DAV
Interrupt Output. This pin is asserted when the screen is touched (PENIRQ), when a measure-
ment exceeds the preprogrammed limits (INT), or when new data is available in the registers
(DAV). Active low, internal 50 k pull-up resistor.
13
AUX/VBAT/GPIO
This pin can be programmed as an auxiliary input to the ADC (AUX), as a battery measure-
ment input to the ADC (VBAT), or as a general-purpose digital input/output (GPIO).
14
N/A
CS
Chip Select for the SPI Serial Interface on the AD7879. Active low.
N/A
14
ADD0
I2C Address Bit 0 for the AD7879-1. This pin can be tied high or low to determine an address
for the AD7879-1 (see Table 25).
15
VCC/REF
Power Supply Input and ADC Reference.
16
X+
Touch Screen Input Channel.
EP
Exposed Pad. The exposed pad is not connected internally. For increased reliability of the
solder joints and maximum thermal capability, it is recommended that the pad be soldered
to the ground plane.
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