APP 4477: 1-Wire Bidirectional Voltage Translator
Today designers need open-drain logic to run at 1.8V at the 1-Wire master IO. While most 1-Wire slave devices can run safely at 5V, most of those same devices cannot run at 1.8V. A bidirectional voltage-level translator circuit is needed to overcome this limitation. This RD (reference design) features the Maxim® MAX3394E, which is a bidirectional voltage-level translator for these applications.
The MAX3394E is a dual-level translator available in an 8-pin, 3mm x 3mm TDFN package. It is ideal for driving high-capacitive loads, thanks to its internal slew-rate enhancement circuitry. 1-Wire slave devices often have capacitive loading greater than 500pF. The MAX3394E's VCC I/O pins are protected to ±15kV HBM (Human Body Model), which protects the 1-Wire master. The 1-Wire bus architectures often interface to the external world, making HBM essential. However, it is recommended that a DS9503P be added as ESD protection for the pull-up resistor (R3), the optional strong pull-up circuitry, and the 1-Wire slave device.
Voltage Level Translator
|Component Count + Extras||
9 + 2
Shutdown, Enable, Standby
Maxim Integrated Products
|Main I.C. Base Part||
|Date Created By Author||2009-11|
|Date Added To Library||2015-03|