AD7879 Ver la hoja de datos (PDF) - Analog Devices
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AD7879 Datasheet PDF : 40 Pages
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AD7879/AD7889
Data Sheet
Y+ 1
NIC 2
NIC 3
X– 4
AD7879
TOP VIEW
(Not to Scale)
12 PENIRQ/INT/DAV
11 NIC
10 NIC
9 DOUT
Y+ 1
NIC 2
NIC 3
X– 4
AD7879-1
TOP VIEW
(Not to Scale)
12 PENIRQ/INT/DAV
11 NIC
10 NIC
9 SDA
NOTES
1. NIC = NO INTERNAL CONNECTION.
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 7. AD7879 LFCSP Pin Configuration
NOTES
1. NIC = NO INTERNAL CONNECTION.
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 7. LFCSP Pin Function Descriptions
Pin No.
AD7879
AD7879-1
Mnemonic
1
1
Y+
2, 3, 10, 11
2, 3, 10, 11
NIC
4
4
X−
5
5
Y−
6
Not applicable DIN
Not applicable 6
ADD1
7
7
GND
8
9
Not applicable
12
8
Not applicable
9
12
SCL
DOUT
SDA
PENIRQ/INT/DAV
13
13
AUX/VBAT/GPIO
14
Not applicable CS
Not applicable 14
ADD0
15
15
VCC/REF
16
16
X+
EP
Description
Touch Screen Input Channel.
No Internal Connection.
Touch Screen Input Channel.
Touch Screen Input Channel.
SPI Serial Data Input to the AD7879.
I2C Address Bit 1 for the AD7879-1. Tie this pin high or low to determine an address for
the AD7879-1 (see Table 25).
Ground. This pin is the ground reference point for all circuitry on the AD7879. Refer all
analog input signals and any external reference signal to this voltage.
Serial Interface Clock Input.
SPI Serial Data Output for the AD7879.
I2C Serial Data Input and Output for the AD7879-1.
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.
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.
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).
Power Supply Input and ADC Reference.
Touch Screen Input Channel.
Exposed Pad. 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.
Rev. D | Page 8 of 40
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