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TP-UART データシート(PDF) 4 Page - Siemens Semiconductor Group |
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TP-UART データシート(HTML) 4 Page - Siemens Semiconductor Group |
4 / 26 page TP-UART-IC The reproduction, transmission or use of this document or it‘s contents is not permitted without express written authority. All rights, including right created by patent grant or registration of a utility model or design, are reserved. Technical changes reserved. 25.15.10.41.33a 25.10.01 page 4 1.2 DC and AC Characteristics The following parameters are valid in the ambient temperature range ϑ amb = -25 οC to 85 οC and for bus voltage VB+ = 20 to 33 V if it is not otherwise declared. When the bus voltage is lower than 20 V and no RESET is active then the normal functionality must be fulfilled, but the parameters may be outside the limits. 1.2.1 Bus Pins VB+ and VB- (Pins 10, 11) Via these pins the ASIC is connected to the bus line. VB- represents the reference potential. Symbol Parameter Min Max Unit Note VVB+ positive line voltage -0.5 45 V 1) Inormal current consumption in analog mode (without clock) 1 mA Inormal current consumption in normal mode (with clock) 1.6 mA 4,9152 MHz 1) during surge impulse is allowed and guaranteed by ext. Elements: -20 V for 2 µs and 65 V for 150 µs 1.2.2 Buffer Voltage VSP (Pin 9) The ASIC delivers a supply voltage of 5 volts to external loads. In order to prevent a rapid change of bus current as a result of a rapid change of the load an external capacitor at the pin VSP is used for energy storage. The static voltage is adjusted to app. 8,8 V (8,2 ...9,2) by an internal regulator. Symbol Parameter Min Max Unit Note VVSP Energy buffer voltage 5.76 13 V 1) CVSP External storage capacitor 80 µF 2) 1) due to the limited current changing rate an overshoot of VVSP after load change may occur 2) recommended 100 µF; must be larger than the capacitor at VCC 1.2.3 Current Controlling Pin CSA (Pin 8) An external capacitor at this pin prevents a quick change of ASIC current in case of quick changing bus voltage VB+ or load current IVCC. The ASIC current changes with a rate of max. 0,5 mA/ms (CCSA = 47 nF). Symbol Parameter Min Max Unit Note CCR max. current changing rate (ext. Start, CCSA = 47 nF) 0.2 0.5 mA/ms 1) 1)tolerance of capacitor CCSA = 47nF/50V +/- 5% |
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同様の説明 - TP-UART |
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