Reference Manual

37 ConnectCore 9M 2443 & Wi-9M 2443 Hardware Reference
Chapter 1
WLAN interface In addition to the on-module wired Ethernet interface, the ConnectCore Wi-9M 2443
module also provides an integrated 802.11a/b/g WLAN interface. The WLAN interface
is based on the Digi WM500ABG baseband processor and specifically designed for
embedded products with long-term product availability requirements.
A/D converter and
touch screen
interface
The 10-bit /10-channels CMOS ADC (Analog to Digital Converter) converts the analog
input signal into 10-bit binary digital codes at a maximum conversion rate of 500KSPS
with 2.5MHz A/D converter clock. A/D converter operates with on-chip sample-and-
hold function and power down mode is supported.
The touch screen Interface can control/select pads (ConnectCore 9M 2443, XP, XM,
YP, YM) of the Touch Screen for X, Y position conversion. The touch Screen Interface
provides Touch Screen Pads control logic and ADC interface logic with interrupt
generation.
Features:
 Resolution: 10-bit
 Differential linearity error: 1.0 LSB
 Integral linearity error: 2.0 LSB
 Maximum conversion rate: 500 KSPS
 Low power consumption
 Power supply voltage: 3.3V
 Analog input range: 0 ~ 3.3V
 On-chip sample-and-hold function
 Normal conversion mode
 Separate X/Y position conversion mode
 Auto (Sequential) X/Y position conversion mode
 Waiting for interrupt mode
Touch screen
interface modes
1. Normal conversion mode
Single Conversion Mode is used for General Purpose ADC Conversion. This mode can
be activated by:
1 Set the ADCCON (ADC Control Register), and
2 Set the read and write to the ADCDAT0 (ADC Data Register 0).
2. Separate X/Y position conversion mode is activated as follows:
1 X-Position Mode writes X-Position Conversion Data to ADCDAT0, so Touch
Screen Interface generates the Interrupt source to Interrupt Controller.
2 Y-Position Mode writes Y-Position Conversion Data to ADCDAT1, so Touch
Screen Interface generates the Interrupt source to Interrupt Controller.