ap3018DN
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
1 Description
This ap3018DN is a touch pad detector IC which offers 8 touch keys. The touching detection IC is designed for replacing traditional button key with diverse pad size.
This IC has three operation mode to choose. Provides direct mode, matrix mode and serial mode selected by pad option.(OPS0 / OPS1 pin )
2 Features
Operating voltage 2.0V~5.5V
Operating current typical 120uA@VDD=3V The output refresh rate about 85Hz@VDD=3V
Maximum 8 input pads and 8 outputs for direct mode. Maximum 8 input pads for serial interface mode.
Maximum 8 input pads provide fixed 2*4 or 3*3 matrix mode.
Output pins are open drain circuit (active low).
Stable touching detection of human body for replacing traditional direct switch keys.
32 steps sensitivity selectable (SLSE1~5pin option).The different clock numbers of 1-step is 2 clocks
After power-on have about 0.7sec stable-time, during the time do not touch the key pad. And the function is disabled.
Package QFN 32pin
3 Applications
Button key replacement
The application is waterproof electronic product.
Typical Application(for direct mode)
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
4 BASIC Block Schematic
Note:
The definition in some pin will be changed under other operation mode, please see the pin description.
5 Pin Description
Pin Name
Pin No. Direct
Serial interface Key
matrix
Pin Description 1 SLSE2 SLSE2 is option pins to selected the sensitivity 2 SLSE3 SLSE3 is option pins to selected the sensitivity 3 SLSE4 SLSE4 is option pins to selected the sensitivity 4 SLSE5 SLSE5 is option pins to selected the sensitivity 5 NA 6 NA 7 I7
Input port 7 8 I6 Input port 6 9 I5 Input port 5 10 I4 Input port 4 SLSE1 SLSE2 SLSE3 SLSE4 SLSE5
Q0Q1Q2Q3Q4Q5Q6Q7
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
11 I3 Input port 3
12 I2 Input port 2
13 I1 Input port 1
14 I0 Input port 0
15 OPT0 OPT0 is option pins to select the time of key-on
16 OPT1 OPT1 is option pins to select the time of key-on
17 OSC1 System oscillator pin
18 VSS GND
19 VDD Power
supply
20 OPS1 Output type option pin
21 OPS0 Output type option pin
22 NA
Q0 Q0 is open drain output pin on direct mode (active low)
23
DO DO is the shifted data output pin on serial mode (open drain)
SCN0 SCN0 is the first scanning pin on matrix mode
Q1 Q1 is open drain output pin on direct mode (active low)
24
SCN1 SCN1 is the second scanning pin on matrix mode
Q2 Q2 is open drain output pin on direct mode (active low)
25
SCN2 SCN2 is the third scanning pin on matrix mode
Q3 Q3 is open drain output pin on direct mode (active low)
26
SCN3 SCN3 is the fourth scanning pin on matrix mode
Q4 Q4 is open drain output pin on direct mode (active low)
27
SCN4 SCN4 is the fifth scanning pin on matrix mode
Q5 Q5 is open drain output pin on direct mode (active low)
28
SCN5 SCN5 is the sixth scanning pin on matrix mode
Q6 Q6 is open drain output pin on direct mode (active low)
29
RST RST is the reset input pin on serial mode
Q7 Q7 is open drain output pin on direct mode (active low)
30
CK CK is the clock input pin on serial mode
31 DV Data valid output signal
32 SLSE1 SLSE1 are option pins to selected the sensitivity
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
6 Absolute Maximum Ratings :
7 Electrical Characteristics
Ta = 25°C
8 FUNCTIONAL DESCRIPTION:
8.1 System timing control:
◎ Inp ut detection sensitivity reserved 5 pin option 32 steps
Features Characteristic Typ System clock OSC1 710KHz@3V
Output refresh rate OSC1/1024/8 ~85Hz DV active pulse width
OSC1/8
~88KHz Parameter Symbol Conditions Value
Unit Operating Temperature T OP ─ -20 ~ +70 ℃ Storage Temperature T STG ─ -50 ~ +125 ℃ Power Supply Voltage VDD Ta=25°C VSS-0.3 ~ VSS+5.5 V Input Voltage
V IN
Ta=25°C
VSS-0.3 ~ VDD+0.3
V ESD ESD ─
≧5
KV
Note ：VSS is system ground
Symbol Parameter
Conditions
Min Typ Max Units VCC Operating Voltage
2.0 3 5.5 V
OSC1 Reference Oscillator VCC=3V no load - 710K - Hz OSC2 Sensor Oscillator VCC=3V no load - 710K - Hz I OP Operation Current VCC=3V no load 120 160 uA V IL Input Ports Input Low Voltage 0 0.2 V V IH Input Ports
Input High Voltage
0.8
1.0
V
I OL Output Port Sink Current VCC=3V, V OL =
0.6V 8 mA I OH
Output Port Source Current
VCC=3V, V OH = 2.4V -4 mA
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
8.2System initial signal:
System initial or mode initial
State Function
Power on reset System reset to initial state
RST=1 Serial mode shift counter reset
8.3Interrupt
For MCU control system, the interrupt request is useful for software programming. The DV signal offer the considerate output control. The DV is active low. Any active input can pass the de-bounce procedure will ac-tive the DV signal.
8.4Key on duration time:
When enable key-on-time, the keys has been detected, it will start the key-on-time counter until releasing key-touch. And for the duration has another key to be detected, the key-on-time counter will be re-counting.
OPT0 OPT1 On duration time
1 1 Infinite(disable
Key-on-time)
0 1 7 seconds to reset system
1 0 2
2 seconds to reset system
0 0 44 seconds to reset system
8.5Output mode
Most output modes will operate at direct or serial mode.
Output type option
mode Remark
OPS1 OPS0 Output
mode
1 1 Direct
0 1 Serial mode Use CK & RST & DO serial out the de-bounce key
1 0 Matrix mode 3*3 fixed type
0 0 Matrix mode 2*4 fixed type
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
8.6 Sensitivity select
Sensitivity selecting is to set the key detecting and releasing condition value for detecting from no-touching to touching. When the key has been detected, the condition of key releasing will change to another value.
Pin SLSE[5~1] The different clock numbers(△_CLK)
The condition value
5 4 3 2 1Detecting Releasing
1 1 1 1 1
2 1
1 1 1 1 0 4 2
1 1 1 0 1 6 3
1 1 1 0 08 4
1 1 0 1 110 5
1 1 0 1 01
2 6
1 1 0 0 114 7
1 1 0 0 016 8
1 0 1 1 118 9
1 0 1 1 020 10
1 0 1 0 12
2 11
1 0 1 0 024 12
1 0 0 1 126 13
1 0 0 1 028 14
1 0 0 0 130 15
1 0 0 0 03
2 16
0 1 1 1 134 17
0 1 1 1 036 18
0 1 1 0 138 19
0 1 1 0 040 20
0 1 0 1 142 21
0 1 0 1 044 22
0 1 0 0 146 23
0 1 0 0 048 24
0 0 1 1 150 25
0 0 1 1 052 26
0 0 1 0 154 27
0 0 1 0 056 28
0 0 0 1 158 29
0 0 0 1 060 30
0 0 0 0 162 31
0 0 0 0 0 32
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
8.7Option pin
For power saving concern and package bonding option consideration, all the feature option pin with latch type design and initialized as 1 as power on. If those pins are forced to VSS, the states will be changed to 0 without any current leakage to conflict the power saving issue.
Feature option pins Initial state by Power on
OPT0 1
OPT1 1
OPS1 1
OPS0 1 SLSE1~SLSE5 sensitivity 11111
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
9.Application Circuit
Direct Mode
Note：
1. On PCB, the length of lines from touch pad to IC pins are best the same with T0 to T7. And the lines do
not parallel and cross with other lines.
2. The power supply must be stable. If the supply voltage drift or shift quickly, maybe causing sensitivity
anomalies or false detections
3. On OSC1 pin adding the C1 capacitor can adjust the system frequency, it will affect the output refresh
rate, power-on stable-time, DV pulse width, and key-on duration time.
4. The material of panel covering on the PCB can not include the metal or the electric element. The paints on
the surfaces are the same.
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE Serial Mode
Note：
1. On PCB, the length of lines from touch pad to IC pins are best the same with T0 to T7. And the lines do
not parallel and cross with other lines.
2. The power supply must be stable. If the supply voltage drift or shift quickly, maybe causing sensitivity
anomalies or false detections
3. On OSC1 pin adding the C1 capacitor can adjust the system frequency, it will affect the output refresh
rate, power-on stable-time, DV pulse width, and key-on duration time.
4. The material of panel covering on the PCB can not include the metal or the electric element. The paints on
the surfaces are the same.
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE Matrix Mode
Note.：
1. On PCB, the length of lines from touch pad to IC pins are best the same with T0 to T7. And the lines do
not parallel and cross with other lines.
2. The power supply must be stable. If the supply voltage drift or shift quickly, maybe causing sensitivity
anomalies or false detections
3. On OSC1 pin adding the C1 capacitor can adjust the system frequency, it will affect the output refresh
rate, power-on stable-time, DV pulse width, and key-on duration time.
4. The material of panel covering on the PCB can not include the metal or the electric element. The paints on
the surfaces are the same.
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE 10 package:
DEVICE SPECIFICATION
ap3018DN
8 KEYS TOUCH PAD DETECTOR IC/THREE MODE
Note
The declared data are only a description of product, information furnished is believed to be accurate and reliable. However, alpha pacific assumes no responsibility for the consequences of use of such information nor for any in-fringement of patents or other rights of third parties which may result from its use. No license is granted by implica-tion or otherwise under any patent or patent rights of alpha pacific. alpha pacific reserves the right to make changes on this specification without notice at any time.
This publication supersedes and replaces all information previously supplied. All alpha pacific products are not authorized for use as critical components in life support devices or systems, except by a written approval of alpha pacific.
Reprinting this data sheet - or parts of it - is only allowed with a license of alpha pacific.
contact
alpha pacific Technologies Co., Ltd
3F-6, No.18, Lane 609, Sec.5
Chung Sin road, Shan Chang City
Taipei-Hsien, TAIWAN, R.O.C
tel +886-2-2999
5456
fax +886-2-2999
5270
internet www.alpha-pacific.com
20.05.2008 SPEC
No.
ap3018DN Rev C Revision
C
13/13下载本文
