参数资料
| 型号： | ACCESS-TOUCH-SS |
| 厂商： | Flexipanel |
| 文件页数： | 2/4页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR TOUCH KEYED 20-SSOP |
| 标准包装： | 25 |
| 系列： | * |
| 其它名称： | 658-1046-5 |
p2 of 4
7-Sep-08
Access-Touch
HW140-1
www.firmwarefactory.com
Device Pinout
Table 2. Pinout Table
Name
Description
Click 1, 2
Buzzer driver
ClosedLED ‘Closed’ LED output
Rst# / Vpp Reset input, active low / Vpp programming input
Lock
Lock release, active high
Lock#
Lock release, active low
OpenLED
‘Open’ LED output
PGD
PGD programming input
SetLED
‘Set Code’ LED output
SetSw
Set Code input control, active high
Touch0
Touch sensor input 0 (Keys 1, 2, 4, 5)
PGC programming input
Touch1
Touch sensor input 1 (Keys 0, 2, 3, 6)
Touch2
Touch sensor input 2 (Keys 0, 4, 7, 8)
Touch3
Touch sensor input 3 (Keys 5, 6, 8, 9)
TouchA
Relaxation Oscillator Drive Output
TouchB
Relaxation Oscillator Reference Voltage Drive
TouchC
Relaxation Oscillator Reference Voltage Input
TouchD
Relaxation Oscillator Counter Input
Vdd
2.0V – 5.5V supply
Vss
Power supply ground
Bill of Materials
The Table 2 shows the recommended components for
the bill of materials.
The table does not include
components for providing power or driving the lock
release, which will be application specific.
Package
sizes apply to the gerber files in the product blueprint.
Table 3. Suggested component values
Label
Component
C1
100nF capacitor 0402
C2
1uF capacitor 0402
C3
1nF capacitor 0402
J1
Jumper or switch for ‘set code’ control
LED1-3
Light emitting diodes, e.g. HSMx-C265
R1
22k resistor 0402
R2
3k3 resistor 0402
R3
1k resistor 0402
R4-R7
120k resistor 0402
R8-R10
470R resistor 0402, adjust for LED brightness
R11
10k resistor 0402
R12
10k resistor 0402, adjust for buzzer volume
U1
PIC16F631-SS with AccessTouch preloaded
X1
Piezo buzzer, e.g. CMT-1603
How It Works
The touch pads measure the capacitance of the
interleaved touch contacts using a relaxation oscillation
oscillator which scans the contacts in turn. When a
finger is placed close to the contacts, the capacitance
will increase, reducing the frequency of the oscillator. A
sudden drop in capacitance is interpreted as a button
press.
The touch pads measure changes in capacitance
relative to a recent moving average.
This provides
some resilience to changes in humidity and water
splashes. In order to achieve reliable operation, keys do
not need to be pressed hard, but they must be held for
approximately 250ms.
When power is applied, all three LEDs light for
approximately
15
seconds
while
the
average
capacitance is initially measured.
After a period of inactivity, an optional sleep state
reduces the key scan rate to once every 500ms. If this
mode of operation is used, the first key must be held for
this time in order to wake the device.
Vss, Vdd
Vss is the power supply ground reference. Vdd should
be connected to a DC supply of 2.0V – 5.5V.
TouchA – Touch D
The TouchA to TouchD pins configure the relaxation
oscillator and should be connected as shown in figure 1.
Touch1 – Touch4
The Touch1 to Touch4 pins are capacitance sense
inputs. They should be connected to the touch pads as
shown in figure 1.
Vpp, PGC, PCD
TEAclipper programming pins. Refer to the Delivery
and Programming section for details. Note that the Vpp
pin may be subject to voltages as high as 12V during
programming.
RST#
The pin is an active low reset input. It is important that
this is connected to a 22k pull-up to Vdd, the TEAclipper
connector, and nothing else.
Open LED
Outputs high when the lock release is triggered. This
pin can drive up to 25mA.
Closed LED
Outputs high when the lock release is not triggered and
the device is not in a sleep state. This pin can drive up
to 25mA.
Set Code LED
Outputs high when the SetSw input is high. This pin can
drive up to 25mA.
SetSw
Set Code input control. Set to Vdd to enter a new code.
The code must be entered twice and is acknowledged
with a beep. This minimizes the chance of entering in
an incorrect code while keeping user operation simple.
It does mean, however, that codes made up of repetitive
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