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PDF AK4160 Data sheet ( Hoja de datos )
| Número de pieza | AK4160 | |
| Descripción | 16-channel Capacitive Touch Sensor IC | |
| Fabricantes | AKM | |
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[AK4160]
AK4160
16-channel Capacitive Touch Sensor IC
GENERAL DESCRIPTION
The AK4160 is a low operating voltage and low power consumption 16-channel capacitive touch sensor.
Maximum 8 channels out of the 16-channel can be configured to LED drive or GPIO. The AK4160 has a
channel independent automatic correct function of environmental drifts for each sense input. It reduces
false detection by continuous calibration of the internal reference value in the situation when the input
capacitance of the touch switch is changed by the external factors such as hydrothermal conditions. The
automatic initial setting function sets the charge current and charge time according to the size and the
shape of a touch switch. The AK4160 can be configured via serial interfaces, it is suitable for mobile
phones, PCs and home electric applications.
FEATURE
Up to 16 capacitive sensor inputs
Up to 8 general purpose inputs/outputs with PWM control for LED
Automatic initial setting function for the charge current and time
Independent automatic environmental drifts correct function for each
sense terminal
Independent threshold configuration for each sense terminal
Selectable multi touch feature
Integrated Median Averaging Filter
Selectable 3 interrupt outputs that be able to use as GPIOs
Reset Input pin
I2C Serial Interface
10 bit SAR A/D Converter with S/H circuit
Integrated Regulator
Low Power Consumption: Typ. 3.4uA
(Sampling rate=512ms, 16ch Sensor input Active)
Power Down Current: Typ. 1.0uA
Low Power Operation: VDD = 1.71V ~ 3.6V
Operating Temperature: Ta = -40 ~ 85 °C
Package: 28pin QFN (4.0mm x 4.0mm, pitch 0.4mm)
I2C-bus is a trademark of NXP B.V.
MS1313-E-01
-1-
2011/11
1 page  
[AK4160]
ABSOLUTE MAXIMUM RATINGS
(VSS = 0V (Note 6))
Parameter
Symbol
Min
max
Power Supply
VDD
-0.3
4.3
Input Current Any Pins except for supply
GPIO Source Current per Pin
IIN
Isource
-
-
±10
12
GPIO Sink Current per Pin
Isink
-
1.2
Input Voltage (Note 7)
VIN -0.3 VDD+0.3 or 4.3
Ambient Temperature (power applied)
Ta -40
85
Storage Temperature
Tstg -65
150
Note 6. All voltages with respect to ground.
Note 7. For all input pins. The maximum value is smaller value between (VDD+0.3)V and 4.3V.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
Unit
V
mA
mA
mA
V
°C
°C
RECOMMEND OPERATING CONDITIONS
(VSS = 0V (Note 6))
Parameter
Symbol
min
typ
Power Supply
VDD
1.71
1.8
Note 6. All voltages with respect to ground.
max
3.6
WARNING: AKM assumes no responsibility for the usage beyond the conditions in this datasheet.
Unit
V
MS1313-E-01
-5-
2011/11
5 Page 
[AK4160]
■ Correction of Environment Drifts
The Capacitance of a sense terminal is influenced from the hydrothermal condition and the grime of the surface.
The AK4160 monitors the measurement value continuously. If the value is changed by the environment, “The Noncontact
Reference Value” is corrected. The reference value is charged very slowly following the measurement value of not
touched status by the correction circuit. The threshold of touch detection and release detection is synchronized with the
reference value. In case of the touch detection, the reference value is not followed to the measurement value.
The increasing rate and the decreasing rate of the reference value can be configured independently. When a finger
approaches slowly to the touch switch, the measurement value is decreased gradually. The decreasing rate of the reference
value must be configured slower than the increasing rate to avoid false detection.
V
Touch
V
Environmental Drift
Reference Value
Release Threshould
Touch Threshould
Measurement Value
T
Reference Value
Measurement Value
Release Threshould
Touch Threshould
T
Figure 8. The Voltage of Sense Terminal and Automatic Correction of Environmental Drift
The initial reference value after the reset release can be selected from a user configuration and the automatic
configuration that configured to 32/32, 31/32, and 30/32 of the first measurement value. (Address 0x70 RIM1-0 bits)
■ Debounce
The touch status is updated when the output of the second filter is judged as touched or released for N times continuously
for a stabilized touch detection. The count “N” is user-selectable from 0 to 15 times. (Address 0x71 DEBT3-0, DEBR3-0
bits) The Update rate of the touch status is calculated as follows. “Sampling Rate of Second Filter x Sample Count of
Second Filter x Debounce Count”
■ Automatic Initial Setting
The capacitance of a sensor is different according to the size and the shape of a touch switch. The charge current and the
charge period should be configured adequately for optimal sensitivity to every touch switches. (Address 0x45-0x54
CCn5-0 bits, Address 0x55-0x5C CTn2-0 bits) The AK4160 has the automatic initial calibration that configured to the
optimal setting. (Address 0x5F ACC)
■ External Reset
The RSTN pin is input terminal for a low-active asynchronous reset with an internal pull-up resistor. A measurement
operation is aborted and the internal circuit is initialized immediately by the reset. The serial interface transaction is also
aborted. If the reset is executed in a transaction, an unintended access may occur. Therefore, the reset must be executed
without transaction of serial interface.
MS1313-E-01
- 11 -
2011/11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AK4160.PDF ] | |
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