Preliminary and proprietary Information of YAMAR Electronics Ltd. Subject to change without notice.

© 2010 Yamar Electronics Ltd.

11

DS-SIG61 R0.932

4.2.3

Remote wake up process

The SIG61 can be awakened by a remote SIG60 master, or SIG61 slave, device transmitting a wakeup

message over the bus. During Sleep Mode, the SIG61 wakes up periodically, every 32mSec, to sense

for bus activity. If a wakeup message is detected, the SIG61 device raises pin INH and lowers pin HDO.

If nSleep pin is low upon remote waking up, the local host (a device controlling the SIG61) which initially

pulled nSleep pin down, must raise the nSleep back high. Figure 4.7 provides the signal description.

Figure 4.7 - Wakeup from bus message

4.2.4

Wakeup from Wake pin

A transition seen on the Wake pin (caused by an external source) is used to wake up the device. The

device then enters Standby mode, it rises pin INH, and transmits a wakeup message to the bus. While

transmitting the wakeup message, the device lowers pin HDO. After the transmission is completed the

device raises pin HDO. This is depicted in Figure 4.8. After the transmission is completed the device

enters Normal mode. If nSleep pin is low upon waking up, the local host which initially pulled nSleep pin

down, must raise the nSleep back to high.

Figure 4.8 - Wakeup from Wake pin

INH

Wake

Normal

mode

DC-BUS

Wakeup Message

Standby

HDO

T1

T2

T1 = 30uS-62uS

T2 = 92uS-124uS

INH

msg. detected

DC-BUS

Wakeup Message

Normal mode

HDO

Standby