AD7879 Просмотр технического описания (PDF) - Analog Devices

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производитель

AD7879

Low Voltage Controller for Touch Screens

Analog Devices 

Data Sheet

AD7879/AD7889

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

BALL A1

INDICATOR

1

2

3

AUX/

VBAT/

GPIO

VCC/REF

X+

A

PENIRQ/

INT/DAV CS

Y+

B

BALL A1

INDICATOR

1

2

3

AUX/

VBAT/

GPIO

VCC/REF

X+

A

PENIRQ/

INT/DAV ADD0 Y+

B

DOUT DIN

X–

C

SCL GND Y–

D

SDA ADD1 X–

C

SCL GND Y–

D

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 5. AD7879/AD7889 WLCSP Pin Configuration

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 6. AD7879-1/AD7889-1 WLCSP Pin Configuration

Table 6. WLCSP Pin Function Descriptions

Pin No.

AD7879/

AD7889

AD7879-1/

AD7889-1

Mnemonic

1A

1A

AUX/VBAT/GPIO

1B

1B

PENIRQ/INT/DAV

1C

Not applicable

1D

2A

2B

Not applicable

Not applicable

1C

1D

2A

Not applicable

2B

DOUT

SDA

SCL

VCC/REF

CS

ADD0

2C

Not

applicable

2D

Not applicable DIN

2C

ADD1

2D

GND

3A

3A

X+

3B

3B

Y+

3C

3C

X−

3D

3D

Y−

Description

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.

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.

SPI Serial Data Output for the AD7879/AD7889.

I2C Serial Data Input and Output for the AD7879-1/AD7889-1.

Serial Interface Clock Input.

Power Supply Input and ADC Reference.

Chip Select for the SPI Serial Interface on the AD7879/AD7889. This pin is active low.

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).

SPI Serial Data Input to the AD7879/AD7889.

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).

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.

Touch Screen Input Channel.

Touch Screen Input Channel.

Touch Screen Input Channel.

Touch Screen Input Channel.

Rev. D | Page 7 of 40

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