參數(shù)資料
型號(hào)： EVAL-AD7877EB
廠商： Analog Devices, Inc.
英文描述： Touch Screen Controller
中文描述： 觸摸屏控制器
文件頁(yè)數(shù)： 7/44頁(yè)
文件大?。?/td> 1002K
代理商： EVAL-AD7877EB
AD7877
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Rev. A | Page 7 of 44
0
NC
1
BAT2
2
BAT1
3
AUX3/GPIO3
4
AUX2/GPIO2
5
AUX1/GPIO1
6
V
CC
NC
7
8
NC
24
DAV
23
ALERT
22
GPIO4
21
STOPACQ
20
DIN
19
CS
18
PENIRQ
17
N
V
R
A
A
V
D
D
D
N
32
31
30
29
28
27
26
25
N
X
Y
X
Y
A
D
N
9
10
11
12
13
14
15
16
NC = NO CONNECT
AD7877
TOP VIEW
(Not to Scale)
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
1
NC
2
BAT2
3
BAT1
4
AUX3/GPIO3
5
AUX2/GPIO2
6
AUX1/GPIO1
7
V
CC
8–9
NC
10
X
11
Y
12
X+
13
Y+
14
AGND
Description
No Connect.
Battery Monitor Input. ADC Input Channel 7.
Battery Monitor Input. ADC Input Channel 6.
Auxiliary Analog Input. ADC Input Channel 5. Can be reconfigured as GPIO pin.
Auxiliary Analog Input. ADC Input Channel 4. Can be reconfigured as GPIO pin.
Auxiliary Analog Input. ADC Input Channel 3. Can be reconfigured as GPIO pin.
Power Supply Input. The V
CC
range for the AD7877 is from 2.2 V to 5.25 V.
No Connect.
Touch Screen Position Input.
Touch Screen Position Input. ADC Input Channel 2.
Touch Screen Position Input. ADC Input Channel 0.
Touch Screen Position Input. ADC Input Channel 1.
Analog Ground. Ground reference point for all analog circuitry on the AD7877. All analog input signals and any
external reference signal should be referred to this voltage.
Digital Ground. Ground reference for all digital circuitry on the AD7877. All digital input signals should be
referred to this voltage.
No Connect.
Pen Interrupt. Digital active low output (has 50 k internal pull-up resistor).
Chip Select Input. Active low logic input. This input provides the dual function of initiating conversions on the
AD7877 and enabling the serial input/output register.
SPI Serial Data Input. Data to be written to the AD7877’s registers should be provided on this input and is
clocked into the register on the rising edge of DCLK.
Stop Acquisition Pin. A signal applied to this pin can be monitored by the AD7877, so that acquisition of new
data by the ADC is halted while the signal is active. Used to reduce the effect of noise from an LCD screen on
the touch screen measurements.
Dedicated general-purpose logic input/output pin.
Digital Active Low Output. Interrupt output, which goes low if a GPIO data bit is set, or if the AUX1, TEMP1,
BAT1, or BAT2 measurements are out of range.
Data Available Output. Active low logic output. Asserts low when new data is available in the AD7877 results
registers. This output is high impedance when CS is high.
No Connect.
External Clock Input. Logic input. DCLK provides the serial clock for accessing data from the part.
Serial Data Output. Logic output. The conversion result from the AD7877 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.
Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial
interface of the AD7877.
15
DGND
16, 32
17
18
NC
PENIRQ
CS
19
DIN
20
STOPACQ
21
22
GPIO4
ALERT
23
DAV
24–25
26
27
NC
DCLK
DOUT
28
V
DRIVE
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