ad7879-1acbz-rl Analog Devices, Inc., ad7879-1acbz-rl Datasheet - Page 7

• Manufacturer Part Number: ad7879-1acbz-rl
• Description: Low Voltage Controller For Touch Screens
• Manufacturer: Analog Devices, Inc.

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
WLCSP
1A
1B
1C
1D
2A
2B
2C
2D
3A
3B
3C
3D
N/A
N/A
NOTES
1. NC = NO CONNECT
2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY.
Pin No.
AND MAXIMUM THERMAL CAPABILITY IT IS RECOMMENDED
FOR INCREASED RELIABILITY OF THE SOLDER JOINTS
THAT THE PAD BE SOLDERED TO THE GROUND PLANE.
LFCSP
8
15
7
16
13
12
9
14
6
1
4
5
2, 3, 10, 11
17
NC
NC
Y+
X–
Figure 5. AD7879 WLCSP Pin Configuration
Figure 6. AD7879 LFCSP Pin Configuration
1
2
3
4
(Not to Scale)
AD7879
TOP VIEW
A
B
C
D
PIN 1
INDICATOR
Mnemonic
AUX/VBAT/GPIO
PENIRQ / INT / DAV
DOUT
SDA
SCL
V
CS
ADD0
DIN
ADD1
GND
X+
Y+
X−
Y−
NC
EP
BALL A1
INDICATOR
PENIRQ/
INT/DAV
CC
(BALL SIDE DOWN)
VBAT/
DOUT
AUX/
GPIO V
SCL
/REF
1
Not to Scale
TOP VIEW
CC
GND
DIN
CS
2
/REF
12
11 NC
10 NC
9 DOUT
Y+
PENIRQ/INT/DAV
X+
X–
Y–
3
Touch Screen Input Channel.
Description
Pin functionality is programmable to be either an auxiliary input to the ADC, as a battery measurement
input to the ADC, or as a general-purpose digital input/output.
Interrupt Output. This pin asserts either when the screen is touched, when new data is available in the registers, or
when a measurement exceeds the preprogrammed limits. Active low, internal pull-up resistor of 50 kΩ.
SPI Serial Data Output on the AD7879.
Serial Data Input and Output on the AD7879-1.
Serial Interface Clock Input.
Power Supply Input. It is also the ADC reference.
Chip Select for the Serial Interface on the AD7879. Active low.
Address Bit 0 for the AD7879-1. This pin can be tied high or low to determine an address for the AD7879-1.
SPI Serial Data Input to the AD7879.
Address Bit 1 for the AD7879-1. This pin can be tied high or low to determine an address for the AD7879-1.
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.
Touch Screen Input Channel.
Touch Screen Input Channel.
Touch Screen Input Channel.
No Connect.
Exposed Pad.
Rev. 0 | Page 7 of 36
NOTES
1. NC = NO CONNECT
2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY.
AND MAXIMUM THERMAL CAPABILITY IT IS RECOMMENDED
FOR INCREASED RELIABILITY OF THE SOLDER JOINTS
THAT THE PAD BE SOLDERED TO THE GROUND PLANE.
Figure 7. AD7879-1 WLCSP Pin Configuration
Figure 8. AD7879-1 LFCSP Pin Configuration
NC
NC
Y+
X–
1
2
3
4
A
B
C
D
BALL A1
INDICATOR
PENIRQ/
(Not to Scale)
INT/DAV ADD0
AD7879-1
(BALL SIDE DOWN)
VBAT/
AUX/
GPIO V
SDA
TOP VIEW
SCL
1
PIN 1
INDICATOR
Not to Scale
TOP VIEW
CC
ADD1
GND
2
/REF
Y+
X+
X–
Y–
3
12
11 NC
10 NC
9 SDA
PENIRQ/INT/DAV
AD7879