AD7889 Analog Devices, AD7889 Datasheet - Page 7

• Manufacturer Part Number: AD7889
• Description: Low Voltage Controller for Touch Screens
• Manufacturer: Analog Devices

Specifications of AD7889

• Resolution (bits): 12bit
• # Chan: 6
• Sample Rate: 105kSPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: CSP

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