2. Show how you would use a MAX 3222 transceiver chip (18-pin plastic DIP packag

Question

2. Show how you would use a MAX 3222 transceiver chip (18-pin plastic DIP package shown) to interface the SCI Rx and Tx pins of the 9S1 2C32 "stamp" module (voltage swing ± 9 V) to a graphic LCD that has CMOS-level Tx and Rx signals (such as the Sparkfun 128x64 device shown). Draw a complete schematic and determine all component values 9S12C32 Module VIN O 32 RES o 30 VCC 29 PEO O 28 O VSS SHDN VCC 16 GND 5 T1OUT 14 R1IN 13 R1OUT 7 O AN2 C2+ 5 MAX3222 C2- 6 T1N 11 T2N 01 R20UT PT4 o 23 PT3|22 PT2 21 PT1 O 20 PTO O 19 T20UT 8 11 O AN6 R2IN 9 13 O PM5 14 O PM4 15 O PM3 PM1 O 17 CBraphic LCD Backpacik OHR-UEE HALT 0082-081 O 00B1-083 ao sparkfun.com c

Explanation / Answer

The 9S12C32 is a stamp module which interfaces with a digital transciever that talks over several interfaces.

The Atmel controllers talks via serial interface with the stamp module.

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