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PDF AKD4184A Data sheet ( Hoja de datos )
| Número de pieza | AKD4184A | |
| Descripción | Touch Screen Controller | |
| Fabricantes | AKM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AKD4184A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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[AK4184A]
AK4184A
TSC with Keypad Scanner and GPIO Expander
GENERAL DESCRIPTION
The AK4184A is a 12-bit A/D converter witch operates 125kHz (max) sampling rate with a 4-wire resistive
touch screen controller (TSC), including low-on resistance switches, touch pressure measurement
capability, a maximum 6 x 5 keypad scanner, eight GPIO ports, and a PWM generator for LED contrast
control. The AK4184A operates down to a 2.5V supply voltage, and it tolerates digital I/O interface voltage
from 1.6V to AVDD in order to connect to low voltage controllers. The AK4184A supports SPI interface for
communication to a host controller. The AK4184A is available in a 41-pin BGA package and it operates
over a temperature range of -40°C to +85°C. The AK4184A is suitable for Cellular Phone, DSC, DVC,
Smart Phone and MP3 player application systems.
FEATURES
SPI Serial Interface
12 bit SAR A/D Converter with S/H Circuit
4-wire Resistive Touch Screen Interface
Sampling Frequency: 125 kHz (max)
Pen Pressure Measurement
6 x 5 Keypad Scanner
8 GPIO Ports
PWM Generator for LED Bias Control
Power Supply:
AVDD = 2.5V ∼ 3.6V
IOVDD = 1.6V ∼ AVDD (Digital I/F)
Low Power Consumption: 400μA
Package: 41pin BGA (4mm x 4mm, pitch 0.5mm)
MS0947-E-00
-1-
2008/04
Free Datasheet http://www.Datasheet4U.com
1 page  
[AK4184A]
F5 GP7
G5 GP6
F6 GP5
G6 GP4
G7 NC
F7 GP3
E6 GP2
E7 GP1
D6 GP0
D7 BRCONT
C6 C6
C7 C5
B6 C4
A7 NC
B7 C3
B5 C2
A6 C1
B4 R5
A5 R4
C3 VSS2
A4 R3
B3 R2
A3 VSS2
B2 R1
A2 IOVDD
I/O GPIO7 pin
I/O GPIO6 pin
I/O GPIO5 pin
I/O GPIO4 pin
- No Connection
No internal bonding. This pin should be open or connected to the ground.
I/O GPIO3 pin
I/O GPIO2 pin
I/O GPIO1 pin
I/O GPIO0 pin
O Pulse width modulated output signal
O Keypad Column 6
O Keypad Column 5
O Keypad Column 4
- No Connection
No internal bonding. This pin should be open or connected to the ground.
O Keypad Column 3
O Keypad Column 2
O Keypad Column 1
I Keypad Row 5
I Keypad Row 4
- Digital I/O Ground
I Keypad Row 3
I Keypad Row 2
- Digital I/O Ground
I Keypad Row 1
- Digital I/O Power Supply: 1.6V ~ AVDD
MS0947-E-00
-5-
2008/04
Free Datasheet http://www.Datasheet4U.com
5 Page 
[AK4184A]
■ Pen Pressure Measurement
Touch screen pen pressure can be derived from the measurement of the contact resistor between two plates. The
contact resistance depends on the size of the depressed area and the pressure. The area of the spot is proportional to
the contact resistance. This resistance (Rtouch) can be calculated using two different methods.
The first method is when the total resistance of the X-plate sheet is already known. The resistance, Rtouch, is
calculated from the results of three A/D conversions: X-position, Z1-Position, and Z2-Position, using the following
formula:
Rtouch = (Rxplate) * (Xposition/4096) * [(Z2/Z1) – 1]
The second method is when both the resistances of the X-plate and Y-plate are known. The resistance, Rtouch, is
calculated from the results of three A/D conversions: X-position, Y-Position, and Z1-Position, using the following
formula:
Rtouch = (Rxplate * Xposition/4096) * [(4096/Z1) – 1] – Ryplate * [1 – (Yposition/4096)]
AVDD
YP-Driver SW ON
YP
AVDD
YP-Driver SW ON
YP
VREF+
ADC
VREF-
AIN+
AIN-
XN-Driver SW ON
XP
XN
YN
Rtouch
VREF+
ADC
VREF-
AIN+
AIN-
XN-Driver SW ON
XP
XN
YN
a) Z1-Position Measurement
b) Z2-Position Measurement
Figure 5. Pen Pressure Measurements
Rtouch
MS0947-E-00
- 11 -
2008/04
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AKD4184A.PDF ] | |
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