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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SABRE-LL-I датащи(PDF) 17 Page - STMicroelectronics |
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SABRE-LL-I датащи(HTML) 17 Page - STMicroelectronics |
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17 / 141 page  SABRE-LL-I Internal supplies 17/141 4.3 VSupplyInt specifications 4.4 Charge pump regulator S.A.B.Re implements a charge pump regulator to generate a voltage over VSupply.This voltage is used to drive internal circuits and the external FET driver and cannot be used for any other purpose. This circuit is always under the supervisory circuit control, so no regulator can start before the VPump voltage reaches its undervoltage rising threshold. If VPump voltage falls down below its under voltage falling threshold, all the regulators will be switched off. The charge pump circuit is disabled when S.A.B.Re is in “Low Power mode”. 4.5 V3v3 regulator V3v3 is the output of an internal regulator used to supply some low voltage internal circuits. This regulator is not intended to provide external current so it must not be used to supply external loads. An external capacitor must always be connected from this pin to gnd. Table 4. VSupplyInt specification Parameter Description Test condition Min Typ Max Unit VS_Int_RNG VSupplyInt output voltage (1) 1. This value is useful to define the voltage rating for external capacitor to be connected from VSupply to VSupplyInt. 18 19.5 21 V IS_Int_TYP VSupplyInt operative current (2) 2. This typical value is only intended to give an extimation of the current consumption when S.A.B.Re is configured in simple regulators mode (see following Chapter 8.7.4) at the end of the start up sequence and with no load on regulators. This typical value allows a raw choose of the external resistor but the definitive choose must be done according to following Note 3). 11 mA RExt External resistor value VSupply=32V IS_Int=12mA (3) 3. REXT could be chosen by applying this formula: REXT = (VSupply min - VS_Int max)/(IS_Int max). IS_Int max is depending from the chosen configuration and represents the total current needed by the circuits connected to this pin. 1000 1.5 Ω CExt External capacitor 80 100 120 nF Table 5. VPump specification Parameter Description Test condition Min Typ Max Unit VPump Regulated Voltage VSupply=32V VSupply +10.5 VSupply +12.5 VSupply +14.5 V FPump VPump clock frequency Fosc = 16MHz typ Fosc/64 KHz CFLY Flying capacitor 100 nF CBOOST Boost capacitor 1 µF |
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