參數(shù)資料
型號(hào): DS276
英文描述: Low Power Transceiver Chip
中文描述: 低功耗、收發(fā)器芯片
文件頁數(shù): 5/11頁
文件大?。?/td> 132K
代理商: DS276
DS276
5 of 11
NOTES:
1.
This circuit as shown does not meet the RS-232 requirement for signal levels (high-level output
voltage). However, as most RS-232 receivers will interpret any voltage over 2V as a space this will
normally be of no consequence. Alternatively, V
DRV+
can be supplied independently from a higher
voltage supply.
2.
The capacitor is charged negatively whenever RX
IN
is in a marking (or idle) state. When the DS276 is
transmitting marking data and RX
IN
is spacing the capacitor will discharge towards ground with a
time constant determined by the capacitor value and the value of the load resistance. The value shown
should store sufficient charge for reliable operation up to 20 kbps.
3.
RX
IN
must never be allowed to reach a negative voltage with respect to V
DRV-
or excessive currents
will be drawn. Therefore, if negative voltage swings are present on RX
IN
, V
DRV-
should not be
connected to ground and the circuit shown in Figure 4 should be used.
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