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ISL40 Folha de dados(PDF) 5 Page - Yamar Electronics Ltd. |
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ISL40 Folha de dados(HTML) 5 Page - Yamar Electronics Ltd. |
5 / 12 page Proprietary and Confidential Information of YAMAR Electronics Ltd. © 2007 Yamar Electronics Ltd. 5 DS-ISL40 R1.6 Figure 3.5 Sleep message Change Frequency message: This type of message consists of 5 bytes - sync break, sync field, “FE” Hex, “00” Hex and checksum. The change frequency message identifier is “FE” Hex and the following data byte “00”Hex. Upon reception of sync break, sync field, “FE” Hex and “00” Hex bytes the frequency changes from F1 to F0 or vise versa. Figure 3.6 Frequency Change message 3.2 Power Management The device features Sleep mode for power saving. Entering Sleep and waking up are done either locally by dedicated pins, or remotely through activity over the bus. 3.2.1 Entering Sleep mode The ISL40 can enter sleep mode in the following ways: 1. Local device lowers its nSleep pin. 2. Remote master SIG40 device can enter the ISL40 device into Sleep Mode from Normal mode by transmitting the remote sleep message. 3. The AutoSleep pin is high and no reception occurred for about 8 seconds. 3.2.2 Remote wake up process The ISL40 can wakeup by a remote SIG40 master or ISL40 device transmits a wakeup message over the bus. During Sleep Mode, the ISL40 wakes up periodically to sense the bus for activity every 32mSec. If a wakeup message is detected, the ISL40 device raises pin INH and lowers pin HDO. If nSleep pin is low upon remote waking up, the local device that lowered it must raise the nSleep back high. Figure 3.6 shows the signals description. Figure 3.7 - Wakeup from bus message 3.2.3 Wakeup from pin Wake 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. After the transmission is completed the device enters Normal Sync break Sync Field 0x3C Zero byte/bytes Checksum INH msg. detected DC-BUS Wakeup Message Normal mode HDO Standby Sync break Sync Field 0xFE Zero byte/bytes Checksum |
Nº de peça semelhante - ISL40 |
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Descrição semelhante - ISL40 |
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