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SP333 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP333 Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 13 page  8 Rev 07/29/02 SP333 RS-232/AppleTalk Programmable Transceiver © Copyright 2002 Sipex Corporation Phase 1 -Vss charge storage- During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to +5V. C1+ is then switched to ground and charge in C1- is trans- ferred to C2-. Since C2+ is connected to +5V, the voltage potential across capacitor C2 is now 10V. Phase 2 -Vss transfer- Phase two of the clock connects the negative terminal of C2 to the Vss storage capacitor and the positive terminal of C2 to ground, and transfers the generated -10V to C3. Simultaneously, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground. Phase 3 -Vdd charge storage- The third phase of the clock is identical to the first phase- the trans- ferred charge in C1 produces -5V in the negative terminal of C1, which is applied to the negative side of capacitor C2. Since C2+ is at +5V, the voltage potential across C2 is 10V. Phase 4 -Vdd transfer- The fourth phase of the clock connects the negative terminal of C2 to ground and transfers the generated 10V across C2 to C4, the Vdd storage capacitor. Simultaneously with this, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground, and the cycle begins again. Since both V+ and V- are separately generated from Vcc in a no load condition, V+ and V- will be symmetrical. Older charge pump approaches that generate V- from V+ will show a decrease in the magnitude of V- compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 15kHz. The external capacitors should be 0.1 µF with a 16V breakdown rating. External Power Supplies For applications that do not require +5V only, external supplies can be applied at the V+ and V- pins. The value of the external supply volt- ages must be no greater than ±10V. The current drain from the ±10V supplies is used for the RS- 232 drivers. For the RS-232 driver, the current requirement is 3.5mA per driver. The external power supplies should provide a power supply sequence of either: +10V, –10V, and then +5V; or –10V, +10V, and then +5V. It is critical that the ±10V supplies are on before V CC. Figure 11. Charge Pump Waveforms –10V b) C 2 – GND GND a) C 2 + +10V |
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