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AD7889 Datasheet(Hoja de datos) 7 Page - Analog Devices

No. de Pieza. AD7889
Descripción  Low Voltage Controller for Touch Screens
Descarga  40 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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Data Sheet
AD7879/AD7889
Rev. D | Page 7 of 40
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
AUX/
VBAT/
GPIO VCC/REF
X+
Y+
DOUT
DIN
X–
SCL
GND
Y–
1
A
B
C
D
23
BALL A1
INDICATOR
PENIRQ/
INT/DAV
CS
Figure 5. AD7879/AD7889 WLCSP Pin Configuration
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
AUX/
VBAT/
GPIO VCC/REF
X+
Y+
SDA
ADD1
X–
SCL
GND
Y–
1
A
B
C
D
23
BALL A1
INDICATOR
PENIRQ/
INT/DAV ADD0
Figure 6. AD7879-1/AD7889-1 WLCSP Pin Configuration
Table 6. WLCSP Pin Function Descriptions
Pin 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
measurement input to the ADC (VBAT), or as a GPIO.
1B
1B
PENIRQ/INT/DAV
Interrupt Output. This pin is asserted when the screen is touched (PENIRQ), when a
measurement exceeds the preprogrammed limits (INT), or when new data is available
in the registers (DAV). This pin is active low and has an internal 50 kΩ pull-up resistor.
1C
Not applicable
DOUT
SPI Serial Data Output for the AD7879/AD7889.
Not applicable
1C
SDA
I2C Serial Data Input and Output for the AD7879-1/AD7889-1.
1D
1D
SCL
Serial Interface Clock Input.
2A
2A
VCC/REF
Power Supply Input and ADC Reference.
2B
Not applicable
CS
Chip Select for the SPI Serial Interface on the AD7879/AD7889. This pin is active low.
Not applicable
2B
ADD0
I2C Address Bit 0 for the AD7879-1/AD7889-1. Tie this pin high or low to determine an
address for the AD7879-1/AD7889-1 (see Table 25).
2C
Not applicable
DIN
SPI Serial Data Input to the AD7879/AD7889.
Not
applicable
2C
ADD1
I2C Address Bit 1 for the AD7879-1/AD7889-1. Tie this pin high or low to determine an
address for the AD7879-1/AD7889-1 (see Table 25).
2D
2D
GND
Ground. This pin is the ground reference point for all circuitry on the AD7879/AD7889.
Refer all analog input signals and any external reference signal 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.




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