Specifications

WA_DEV_FEX20_PTS_004 Rev 001 June 30, 2010 33
Expansion Card Product Technical
Specification
Signals and Indicators
5.2.1. Pin Description
Refer to the following table for the pin description of the BOOT signal.
Table 25: Boot Signal Pin Description
Pin Number
Signal
I/O
I/O Type
Description
12
BOOT
I
1V8
Download mode selection
Refer to section 4.2 Electrical Information for Digital I/O for open drain, 2V8 and 1V8 voltage
characteristics and reset state definitions.
For more information about using AT Commands to manipulate this signal, refer to document [12] AT
Commands Interface Guide.
Note that this BOOT signal must be left open for normal use or XMODEM download.
5.3. External Interrupt
The Expansion Card provides one external interrupt input. This interrupt input can be activated on the:
 High to low level transition
 Low to high level transition
 Low to high and high to low level transitions
When used, the interrupt input must not be left open; when not used, this signal must be configured
as a GPIO.
5.3.1. Pin Description
Refer to the following table for the pin description of the external interrupt.
Table 26: External Interrupt Pin Description
Pin
Number
Signal
I/O
I/O Type
Reset State
Description
Multiplexed
With
32
INT0
I
1V8
Z
External Interrupt
GPIO3
Refer to section 4.2 Electrical Information for Digital I/O for open drain, 2V8 and 1V8 voltage
characteristics and reset state definitions.
5.3.2. Electrical Characteristics
Refer to the following table for the electrical characteristics of the external interrupt.
Table 27: Electrical Characteristics of the External Interrupt
Parameter
Minimum
Maximum
Unit
INT0
V
IL
0.54
V
V
IH
1.33
V