參數(shù)資料
型號(hào)： AK4184VG
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)： 9/36頁(yè)
文件大?。?/td> 597K
代理商： AK4184VG
[AK4184]
MS0603-E-00
2007/04
9
OPERATION OVERVIEW
The AK4184 consists of the following blocks:
z
4-wire resistive touch screen controller interface
z
6 columns by 5 rows keypad interface
z
8 GPIO pins
z
PWM control circuit for LED bias control
z
Successive approximation resister (SAR) A/D converter
z
Pen interrupt and key interrupt circuit
z
Oscillation circuit
AK4184 interfaces to the host processor through standard SPI serial interface.
SPI is the trademark of Motorola
■
Touch Screen A/D Converter
The AK4184 incorporates a 12-bit successive approximation resistor (SAR) A/D converter for determining the touch
position and pressure measurement. The architecture is based on a capacitive redistribution algorithm, and an internal
capacitor array functions as the sample/hold (S/H) circuit. The SAR A/D converter output is in straight binary format
as shown below:
Input Voltage
(
Δ
VREF-1.5LSB) ~
Δ
VREF
(
Δ
VREF-2.5LSB) ~ (
Δ
VREF-1.5LSB)
---------
0.5LSB ~ 1.5LSB
0 ~ 0.5LSB
Δ
VREF: (VREF+) – (VREF-)
Table 1. Output Code
Output Code
FFFH
FFEH
---------
001H
000H
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