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Note:
Power Consumption.
Application
The level shifter must be a V28 electrical signal compliant with 2.8V.
Note:
The U1 chip also protects the WISMO228 against ESD (air discharge) at 15KV.
The following table lists the recommended components to use in implementing a level shifter
UART.
Component
R1, R2
C1, C2, C3, C4, C5
C6
C7
U1
J1
R1 and R2 are necessary only during the Reset state to force the ~CT125/RI and ~CT109/DCD signals
to HIGH level.
The ADM3307EACP can be powered by the VCC_2V8 (pin 46) of the WISMO228 or by an external
regulator at 2.8V.
WA_DEV_W228_PTS_002
Figure 10. Example of RS-232 Level Shifter Implementation for UART
Description/Details
15KΩ
1µF
100nF
6.8uF TANTAL 10V CP32136
ADM3307EACP
SUB-D9 female
Rev 001
Product Technical Specification &
Customer Design Guidelines
Manufacturer
AVX
ANALOG DEVICES
Page 45 of 108
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