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MAS3587F 数据表(PDF) 12 Page - Micronas |
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MAS3587F 数据表(HTML) 12 Page - Micronas |
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12 / 82 page ![]() MAS 3587F ADVANCE INFORMATION 12 Micronas If both DC/DC-converters are off, a high signal may be applied at pin DCEN. This will start the converters in their default mode (PWM with 3.0 V output voltage). The PUP signal will change from low to high when both converters have reached their nominal output voltage and will return to low when both converters output volt- ages have dropped 200 mV below their programmed output voltage. The signal at pin PUP can be used to control the reset of an external microcontroller (see Section 2.13.2. on page 15 for details on start up pro- cedure). If only DC/DC-converter 1 is used, the output of the unused converter 2 (VSENS2) must be connected to the output of converter 1 (VSENS1) to make the PUP signal work properly. Also, if a DC/DC-converter is not used (no inductor connected), the pin DCSO must be left vacant. Fig. 2–7: DC/DC converter overview (DCEN input must be connected to pin I2CVDD via the start-up push button) 15 8 − + − + VSS DCSO2 DCSG2 DCEN PUP VSENS2 Vin 22 µH C1 330 µF S R 30 DCFR (77hex) DCCF (76hex) 70 DCCF (76hex) D1 Start PUP2 set voltage factor output 1 I2CVDD to I2C interface supply L1 VBAT battery voltage monitor DC/DC converter 2 voltage monitor voltage monitor DC/DC converter 1 frequency divider system or crystal clock − + |
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