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3.2
Sleep Mechanism
Three signals are dedicated for Sleep wakeup mechanism
3.2.1
nSleep
Sleep control input from the host. This pin is high for normal operation, and low for Sleep Mode. When
not in use, this pin should be pulled Up.
3.2.2
Wake
Local wakeup input. Negative or positive edge wakes up the device. When not in use, this pin should be
pulled Up or Down.
3.2.3
INH
Inhibit output for enabling the host (or an external voltage regulator powering the host. This output is
LOW when in Sleep Mode, and HIGH in normal operation and after a wakeup event.
3.3
Line interface
Whenever a dual channel F0/F1 is required, the line interface is described in figure 3.2. It requires
addition analog switch such as FSA157 and two transistors for Tx and Rx drivers.
Ceramic
Filter F0
TxOn
MF0nF1
Data In
Tx.
Modulator
DTxO
RxOn
Tx.
Driver
DC Line
Data Out
Rx.
Demodulator
RxP
RxN
Rx.
Buffer
Ceramic
Filter F1
Figure 3.2 – DC - line interface block diagram
The line interface signals are:
3.3.1
DTxO
Modulated transmit signal output
3.3.2
TxOn
High when the device is transmitting
3.3.3
MF0nF1
Output signal indicates the selected channel. F0=”High”, F1= “Low”.
3.3.4
RxP
Comparator’s positive pin input signal. It swings around RxN.
3.3.5
RxN
Comparator’s negative pin input signal. Its value should be about Vcc/2.
@ 2007 Yamar Electronics Ltd.
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DS-SIG40 R1.8