Table of Contents
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List of Figures
Figure 1.
Functional Architecture ............................................................................................................... 21
Figure 2.
Power Supply During Burst Emission ...................................................................................... 24
Figure 3.
Reject Filter Diagram . ................................................................................................................... 25
Figure 4.
SPI Timing Diagram ..................................................................................................................... 35
Figure 5.
Example of an SPI to UART2 Interface Conversion Implementation ................................. 36
Figure 6.
Example of an RS-232 Level Shifter Implementation for UART2 ........................................ 37
Figure 7.
Example of RS-232 Level Shifter Implementation for UART . ............................................... 40
Figure 8.
Example of V24/CMOS Serial Link Implementation for a 2-wire UART............................ 41
Figure 9.
Example of V24/CMOS Serial Link Implementation for a 4-wire UART............................ 42
Figure 10.
Example of V24/CMOS Serial Link Implementation for a 5-wire UART............................ 42
Figure 11.
Example of a Full Modem V24/CMOS Serial Link Implementation for a full UART . ...... 43
Figure 12.
Example of a SIM Socket Implementation ............................................................................... 46
Figure 13.
DC Equivalent Circuit of MIC .................................................................................................... 50
Figure 14.
AC Equivalent Circuit of MIC .................................................................................................... 50
Figure 15.
Equivalent Circuit of SPK . ........................................................................................................... 52
Figure 16.
Example of a Differential MIC Connection with an LC Filter .............................................. 54
Figure 17.
Example of a Differential MIC Connection without an LC Filter ........................................ 54
Figure 18.
Example of a Single-Ended MIC Connection with an LC filter . ........................................... 55
Figure 19.
Example of a Single-Ended MIC Connection without an LC Filter . .................................... 56
Figure 20.
Example of a Differential Speaker Connection . ....................................................................... 57
Figure 21.
Example of a Single-Ended Speaker Connection .................................................................... 57
Figure 22.
Capacitor Soldered in Parallel to the Microphone . ................................................................. 58
Figure 23.
Audio Track Design ..................................................................................................................... 60
Figure 24.
Differential Audio Connection ................................................................................................... 60
Figure 25.
Single-Ended Audio Connection ............................................................................................... 61
Figure 26.
Relative Timing for the PWM Output . ...................................................................................... 62
Figure 27.
Example of an LED Driven by the PWM0 or PWM1 Output ............................................... 63
Figure 28.
BUZZER Output ........................................................................................................................... 64
Figure 29.
Example of a BUZZER Implementation ................................................................................... 65
Figure 30.
Example of an LED Driven by the BUZZER Output . ............................................................. 67
Figure 31.
Example of the ON/~OFF Pin Connection ............................................................................... 69
WA_DEV_W228_PTS_002
Rev 001
Product Technical Specification &
Customer Design Guidelines
Page 9 of 108
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