Datasheet
AD7879/AD7889
Rev. C | Page 7 of 40
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
07667-005
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
AUX/
VBAT/
GPIO
V
CC
/REF
X+
Y+
DOUT DIN X–
SCL
GND
Y–
1
A
B
C
D
2 3
BALL A1
INDICATOR
PENIRQ/
INT/DAV
CS
Figure 5. AD7879/AD7889 WLCSP Pin Configuration
07667-006
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
AUX/
VBAT/
GPIO
V
CC
/REF
X+
Y+
SDA ADD1 X–
SCL
GND
Y–
1
A
B
C
D
2 3
BALL A1
INDICATOR
PENIRQ/
INT/DAV
ADD0
Figure 6. AD7879-1/AD7889-1 WLCSP Pin Configuration
Table 6. Pin Function Descriptions, WLCSP
Ball No.
Mnemonic Description
AD7879/
AD7889
AD7879-1/
AD7889-1
1A 1A 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).
1B 1B
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 kΩ pull-up resistor.
1C N/A DOUT SPI Serial Data Output for the AD7879/AD7889.
N/A 1C SDA I
2
C Serial Data Input and Output for the AD7879-1/AD7889-1.
1D 1D SCL Serial Interface Clock Input.
2A 2A V
CC
/REF Power Supply Input and ADC Reference.
2B N/A
CS
Chip Select for the SPI Serial Interface on the AD7879/AD7889. Active low.
N/A 2B ADD0
I
2
C Address Bit 0 for the AD7879-1/AD7889-1. This pin can be tied high or low to determine
an address for the AD7879-1/AD7889-1 (see Table 25).
2C N/A DIN SPI Serial Data Input to the AD7879/AD7889.
N/A 2C ADD1
I
2
C Address Bit 1 for the AD7879-1/AD7889-1. This pin can be tied high or low to determine
an address for the AD7879-1/AD7889-1 (see Table 25).
2D 2D GND
Ground. Ground reference point for all circuitry on the AD7879/AD7889. All analog input
signals and any external reference signal should be referred to this voltage.
3A 3A X+ Touch Screen Input Channel.
3B 3B Y+ Touch Screen Input Channel.
3C 3C X− Touch Screen Input Channel.
3D 3D Y− Touch Screen Input Channel.