參數(shù)資料
型號(hào)： AK4184
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： TSC with Keypad Scanner and GPIO Expander
中文描述： 臺(tái)糖與鍵盤掃描儀和GPIO擴(kuò)展
文件頁(yè)數(shù)： 16/36頁(yè)
文件大?。?/td> 597K
代理商： AK4184
[AK4184]
MS0603-E-00
2007/04
16
■
System Reset
Upon power-up, all blocks of the AK4184 should be reset by executing RESETN pin = “L”. This ensures that all
internal registers are reset to their initial values (0000H). The touch screen control data is set to X-measurement and
auto driver off (A1 bit=A0 bit = PD bit=“0”). Internal state is fixed and the pen interrupt function is enabled. If the
AVDD and IOVDD are supplied separately, the power up sequence is not critical.
■
Touch Screen Control Command
The control command (4 bits) provided to the AK4184 via DIN is shown in
Table 5
. This command includes a start bit,
channel selection of ADC input, power-down mode of ADC and the next 12bits (written by “0” data). The AK4184
latches the serial command on the rising edge of SCLK. Detail information regarding the bit order, function, status of
the driver switch, ADC input and reference voltage as shown in
Table 6
and
Table 7
.
D15
D14
D13
D12
D11
D10
D9
D8
S
A1
A0
PD
0
0
0
0
Table 5. Touch Screen Command Word Format
Bits
Name
15
S
Start Bit. This bit must be “1”
14:13
A1-A0
Channel Selection Bits. Analog inputs to the A/D converter and the activated driver
switches are selected. (Table 7)
12
PD
Power-down Mode (Table 8)
11:0
Reserved
Table 6. The definition of touch screen control data
Input
Status of Driver Switch
ADC input
(
Δ
AIN)
S
A1
A0
XP
XN
YP
YN
AIN+
1
0
0
ON
ON
OFF OFF
YP
1
0
1
OFF
OFF
ON
ON
XP
1
1
0
OFF
ON
ON
OFF
XP(Z1)
1
1
1
OFF
ON
ON
OFF
YN(Z2)
Table 7. Status of Driver Switch
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
0
D0
0
Function
Reference Voltage
(
Δ
VREF)
VREF+
XP
YP
YP
YP
AIN-
XN
YN
XN
XN
VREF-
XN
YN
XN
XN
Note
X-axis
Y-axis
Z1 (Pen Pressure)
Z2 (Pen Pressure)
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