Preliminary and proprietary Information of YAMAR Electronics Ltd. Subject to change without notice.
4.6.2
Wakeup from pin nSleep
In this case, the host raises the nSleep pin. The device then enters Normal mode and raises pin INH.
The device automatically transmits a wakeup message to wakeup all other devices on the bus. While
transmitting this wakeup message to the bus, the device lowers pin HDO. After the transmission is
complete the device raises pin HDO (can be used to signal/interrupt the host). After the transmission is
completed and pin nSleep is high, the device enters Normal mode. See Figure 4.3 for signals
description.
T5
nSleep
INH
Wakeup Message
Powerline
Normal
Standby
HDO
T7
Figure 4.3 - Wakeup from nSleep
4.6.3
Wakeup from pin Wake
In this case, a transition on pin Wake (caused by an external switch of the application) is used to wake
the device. The device then enters Standby mode, raises pin INH, and transmits a wakeup message to
the bus. While transmitting the wakeup message to the bus, the device lowers pin HDO. After the
transmission is complete the device raises pin HDO (can be used to signal/interrupt the host). After the
transmission is completed and pin nSleep is high, the device enters Normal mode. The host has to raise
the nSleep pin (otherwise the device will remain in Standby mode).
Wake
INH
T6
nSleep
Wakeup Message
Powerline
HDO
Standby
Normal mode
T8
Figure 4.4 - Wakeup from Wake
4.6.4
Wakeup from bus message
During Sleep mode, the device wakes up periodically to check for activity on the bus every 32 mSec. If
a wakeup message is detected, the device enters Standby mode and raises pin INH. The device then
signals the host by lowering pin HDO for a minimal duration of 8 bits, and a maximal duration of about
150mSec. The host has to raise nSleep pin (otherwise the device will remain in Standby mode). After
completing the reception, the device enters Normal mode. See Figure 4.5 for signals description.
© 2010 Yamar Electronics Ltd.
11
DS-SIG60 R0.921
YAMAR [ YAMAR ELECTRONICS LTD. ]
