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SP3282EB Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3282EB Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 15 page Date: 02/24/05 SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers © Copyright 2005 Sipex Corporation 10 AUTO ON-LINE® Circuitry The SP3282EB device has a patent pending AUTO ON-LINE® circuitry on board that saves power in applications such as laptop computers, palmtop (PDA) computers, and other portable systems. The SP3282EB device incorporates an AUTO ON-LINE® circuit that automatically enables itself when the external transmitters are enabled and the cable is connected. Conversely, the AUTO ON-LINE® circuit also disables most of the internal circuitry when the device is not being used and goes into a standby mode where the device typically draws 1 µA. This function is controlled by the ONLINE pin. When this pin is tied to a logic LOW, the AUTO ON-LINE® func- tion is active. Once active, the device is enabled until there is no activity on the receiver inputs. The Table 3. AUTO ON-LINE® Logic N W O D T U H S T U P N I E N I L N O T U P N I T A L A N G I S 2 3 2 - S R T U P N I R E V I E C E R S U T A T S T U P T U O T X T U OR X T U O R E V I E C S N A R T S U T A T S H G I H- S E YH G I He v i t c Ae v i t c A l a m r o N n o i t a r e p O H G I HH G I HO NW O Le v i t c Ae v i t c A l a m r o N n o i t a r e p O H G I HW O LO NW O LZ - h g i He v i t c A E N I L - N O O T U A ® e d o M W O L- S E YH G I HZ - h g i HZ - h g i Hn w o d t u h S W O L- O NW O LZ - h g i HZ - h g i Hn w o d t u h S Figure 16. Stage II of AUTO ON-LINE® Circuitry STATUS Delay Stage Delay Stage Delay Stage R1 INACT R2 INACT R3 INACT receiver input typically sees at least +3V, which are generated from the transmitters at the other end of the cable with a +5V minimum. When the external transmitters are disabled or the cable is disconnected, the receiver inputs will be pulled down by their internal 5k Ω resistors to ground. When this occurs over a period of time, the internal transmitters will be disabled and the device goes into a shutdown or standby mode. When ONLINE is HIGH, the AUTO ON-LINE® mode is disabled. The AUTO ON-LINE® circuit has two stages: 1) Inactive Detection 2) Accumulated Delay The first stage, shown in Figure 15, detects an inactive input. A logic HIGH is asserted on R XINACT if the cable is disconnected or the |
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