Rainbow Electronics DAB-WLS-C01 (WiFi) - Manual (Page 8)

DSH_WISMC01_1v2 WISM 40 pin TCP-IP Data Sheet.doc © 2007 EZURiO Ltd
Page 8
5.2 Electrical Specifications
5.2.1 Absolute Maximum ratings
Absolute maximum ratings for supply voltage and voltages on digital and analogue pins of the Module
are listed below. Exceeding these values will cause permanent damage.
Parameter Min Max Unit
Peak current of power supply 550 mA
Voltage at digital pins -0.3 3.3 V
Voltage at VCC_5V pin 3.3 5 V
5.2.2 Recommended Operating Parameters
5.2.2.1 Power Supply
Signal Name Pin No Voltage level Comments
VCC_5V 28, 29, 31 3.3V to 5.0V I
typ
= 250mA.
All VCC_5V pins should be connected
GND 11,15,18,30,36,38 All six GND pins should be connected
5.2.2.2 Signal Levels for Interface and GPIO
Signal Type Signal level Signal level @ 0mA load Signal level @ 4mA load
Input V
IL
max=0.8V
V
IH
min=2.1V
V
IH
max=3.3V
Output V
OL
max=0.2V
V
OH
min=2.8V
V
OL
max=0.4V
V
OH
min=2.6V
5.2.2.3 RS-232 Interface
Signal Name Pin No I/O Comments
UART_TX 21 O This pin must NOT be pulled low by external circuitry.
UART_RX 25 I
UART_CTS 19 I
UART_RTS 23 O
UART_DSR 10 I Used to enable autorun at power up – programmable by script
UART_DTR 12 O Direction is programmable – default is Output
UART_RI 6 O Direction is programmable – default is Output
UART_DCD 8 O Direction is programmable – default is Output
5.2.2.4 General Purpose I/O and ADC
Signal Name Pin No I/O Comments
GPIO 1 - 9 2,4,14,16,33,35,37, 39 I or O There is no GPIO3
GPIO 10 – 13 10,12,6,8 I or O Shared with DSR, DTR, RI, DCD
WAKEUP 22 I Reserved
ADC0, ADC1 1, 3 I Range 0 – 3.0V