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11

DS-SIG40 R1.8

Figure 4.6 - 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 4.7 for signals description.

Figure 4.7 - Wakeup from bus message

4.7

Timing Characteristic

Symbol

Figure

Characteristics

Min

Max

4.3,4.4

Drop of HDC to drop of HDI

200nS

4.3

Raise of HDC to drop of HDI

200nS

4.3

Command stop bit to raise of HDC

Half bit

rate

Drop of nSleep to drop of INH

30uS

62uS

4.5

Raise of nSleep to raise of INH

30uS

62uS

4.6

Transact on Wake to raise of INH

30uS

62uS

4.5

Raise of nSleep to drop of HDO

92uS

124uS

4.6

Transact on Wake to drop of HDO

92uS

124uS

Power Up or Reset to Normal mode

6mS

nSleep

INH

msg. detected

DC-BUS

Wakeup Message

Normal

HDO

Standby

INH

Wake

Normal

mode

DC-BUS

Wakeup Message

Standby

nSleep

HDO