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ST92F124 数据表(PDF) 23 Page - STMicroelectronics |
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ST92F124 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 429 page  23/429 ST92F124/F150/F250 - GENERAL DESCRIPTION 1.3 VOLTAGE REGULATOR The internal Voltage Regulator (VR) is used to power the microcontroller starting from the exter- nal power supply. The VR comprises a Main volt- age regulator and a Low-power regulator. – The Main voltage regulator generates sufficient current for the microcontroller to operate in any mode. It has a static power consumption (300 µA typ.). – The separate Low-Power regulator consumes less power is used only when the microcontrol- ler is in Low Power mode. It has a different de- sign from the main VR and generates a lower, non-stabilized and non-thermally-compensated voltage sufficient for maintaining the data in RAM and the Register File. For both the Main VR and the Low-Power VR, sta- bilization is achieved by an external capacitor, connected to one of the VREG pins. The minimum recommended value is 300 nF, and care must be taken to minimize distance between the chip and the capacitor. Care should also be taken to limit the serial inductance to less than 60nH. Figure 16. Recommended Connections for VREG IMPORTANT: The VREG pin cannot be used to drive external devices. Figure 17. Minimum Required Connections for VREG Note: Pin 31 of PQFP100 or pin 28 of LQFP100 can be left unconnnected. A secondary stabilization net- work can also be connected to these pins. PQFP100 QFP64 C L L = Ferrite bead for EMI protection. Pin 28 C L Pin 43 Pin 31 LQFP100 C L Pin 40 Pin 28 Suggested type: Murata BLM18BE601FH1: (Imp. 600 Ω at 100 MHz). C = 300 to 600nF C PQFP100 QFP64 C Pin 43 Pin 31 Pin 28 C LQFP100 Pin 40 Pin 28 C = 300 to 600nF 9 |
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