AD7879

Rev. 0 | Page 7 of 36

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

AUX/

VBAT/

GPIO

X+

Y+

DOUT

DIN

X–

SCL

GND

Y–

1

A

B

C

D

23

BALL A1

INDICATOR

PENIRQ/

INT/DAV

CS

Figure 5. AD7879 WLCSP Pin Configuration

PIN 1

INDICATOR

1

Y+

2

NC

3

NC

4

X–

11 NC

12

10 NC

9DOUT

AD7879

TOP VIEW

(Not to Scale)

PENIRQ/INT/DAV

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 6. AD7879 LFCSP Pin Configuration

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

AUX/

VBAT/

GPIO

X+

Y+

SDA

ADD1

X–

SCL

GND

Y–

1

A

B

C

D

23

BALL A1

INDICATOR

PENIRQ/

INT/DAV ADD0

Figure 7. AD7879-1 WLCSP Pin Configuration

PIN 1

INDICATOR

1

Y+

2

NC

3

NC

4

X–

11 NC

12

10 NC

9SDA

AD7879-1

TOP VIEW

(Not to Scale)

PENIRQ/INT/DAV

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 5. Pin Function Descriptions

Pin No.

Mnemonic

Description

WLCSP

LFCSP

1A

13

AUX/VBAT/GPIO

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.

1B

12

PENIRQ/INT/DAV

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.

1C

9

DOUT

SDA

SPI Serial Data Output on the AD7879.

Serial Data Input and Output on the AD7879-1.

1D

8

SCL

Serial Interface Clock Input.

2A

15

Power Supply Input. It is also the ADC reference.

2B

14

CS

ADD0

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.

2C

6

DIN

ADD1

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.

2D

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.

3A

16

X+

Touch Screen Input Channel.

3B

1

Y+

Touch Screen Input Channel.

3C

4

X−

Touch Screen Input Channel.

3D

5

Y−

Touch Screen Input Channel.

N/A

2, 3, 10, 11

NC

No Connect.

N/A

17

EP

Exposed Pad.