[an error occurred while processing this directive]
|
Book of iButton™ Standards
Chapter 4
Page 38
If a Touch Memory is disconnected from the probe, it will pull its data line low via an internal current source of 5 uA. This simulates a Reset Pulse of unlimited duration. As soon as the Touch Memory detects a high level on the data line, it will generate a Presence Pulse. This feature can be used to automatically power up the Touch Pen, for example, to save energy between reads or writes. It also useful to trigger a serial port hardware interrupt when using a PC and COM port adaptor.
E-mail: info@telesys.ru