Master-slave interface

摘要

A bus interface couples a master device and one or more slave devices. Upon detecting a condition on the bus, one or more of the slave devices may force an extension of the bus condition for a predetermined time period. The forced extension may comprise forcing a voltage level, causing other devices on the bus to change modes. A master on the bus may detect an out-of-variance bus condition and, in response, take action to change the bus state to a stable condition. The bus interface may include power contacts and a single-wire bus for communicating between a host device and one or more battery packs.

主权项

1. A method comprising:
detecting, on a bus that couples a master device and one or more slave devices, a condition indicative of at least one device coupled to the bus transitioning from a first mode to a second mode, wherein the master device and the one or more slave devices communicate by alternating a voltage level on the bus between a low voltage level and a high voltage level, and wherein the first mode is different from the second mode and the first mode enables the one or more slave devices to initiate an interrupt to the master device; and in response to detecting the condition, forcing an extension of the condition on the bus for a predetermined time period.