ad51-064z-0reel Analog Devices, Inc., ad51-064z-0reel Datasheet - Page 6

• Manufacturer Part Number: ad51-064z-0reel
• Description: Touch Screen Digitizer
• Manufacturer: Analog Devices, Inc.

AD7843
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Pin No.
1, 10
2
3
4
5
6
7
8
9
11
12
13
14
15
16
Mnemonic
+V
X+
Y+
X−
Y−
GND
IN3
IN4
V
PENIRQ
DOUT
BUSY
DIN
CS
DCLK
REF
CC
Function
Power Supply Input. The +V
directly together.
X+ Position Input. ADC Input Channel 1.
Y+ Position Input. ADC Input Channel 2.
X− Position Input.
Y− Position Input.
Analog Ground. Ground reference point for all circuitry on the AD7843. All analog input signals and any external
reference signal should be referred to this GND voltage.
Auxiliary Input 1. ADC Input Channel 3.
Auxiliary Input 2. ADC Input Channel 4.
Reference Input for the AD7843. An external reference must be applied to this input. The voltage range for the
external reference is 1.0 V to +V
Pen Interrupt. CMOS logic open-drain output (requires 10 kΩ to 100 kΩ pull-up register externally).
Data Out. Logic Output. The conversion result from the AD7843 is provided on this output as a serial data stream.
The bits are clocked out on the falling edge of the DCLK input. This output is high impedance when CS is high.
BUSY Output. Logic Output. This output is high impedance when CS is high.
Data In. Logic input. Data to be written to the AD7843 control register is provided on this input and is clocked into
the register on the rising edge of DCLK (see the Control Register section).
Chip Select Input. Active Low Logic Input. This input provides the dual function of initiating conversions on the
AD7843 and also enables the serial input/output register.
External Clock Input. Logic Input. DCLK provides the serial clock for accessing data from the part. This clock input
is also used as the clock source for the AD7843 conversion process.
Figure 3. Pin Configuration QSOP/TSSOP
CC
+V
GND
range for the AD7843 is from 2.2 V to 5.25 V. Both +V
IN3
IN4
X+
Y+
CC
X–
Y–
CC
. For specified performance, it is 2.5 V.
1
2
3
4
5
6
7
8
(Not to Scale)
Rev. B | Page 6 of 20
AD7843
TOP VIEW
16
15
14
13
12
11
10
9
DCLK
CS
DIN
BUSY
DOUT
PENIRQ
+V
V
REF
CC
CC
pins should be connected