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BD49101AEFS-ME2 Datasheet(PDF) 4 Page - Rohm |
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BD49101AEFS-ME2 Datasheet(HTML) 4 Page - Rohm |
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4 / 45 page  4/41 TSZ02201-0V3V0AP00060-1-2 © 2015 ROHM Co., Ltd. All rights reserved. 23.Jun.2016 Rev.002 www.rohm.com TSZ22111・15・001 BD49101AEFS-M Description of Blocks ・DCDC2 – STBREG Switch Function The ECO input is used to switch between operating mode and low power standby mode. (This function is for a 3.3V I/O microcomputer because of the 3.3V fixed STBREG output) The function of the ECO input is as follows: ECO = H – Normal Operating Mode (DCDC2 operating). ECO = L – Low Power Standby Mode (STBREG operating). ・Sequence of VIN0 start up, Low Power Standby mode Figure 3. Timing Chart of VIN0 start up, Low Power Standby Mode ① When BD49101AEFS starts up, it starts in the normal operation mode (DCDC2 operation), independent of ECO setting. An internal regulator, the reference voltage circuit, and the OSC circuit start up when the voltage of the BCAP pin exceeds low voltage protection release voltage (4.7V). ② Following the first access to the I 2C interface, the ECO input is able to control the operating mode (normal or low power standby). ECO must be set to the desired operating mode prior to accessing the I 2C interface for the first time. ③ The conditions of independent of ECO setting is shown below. Input power supply for VIN0 at the first time BCAP voltage becomes under 4.5V DCDC2 detects over current and DCDC2 restarts At each condition ECO setting become effective after you send I 2C command and receive ACK. DCDC2 VIN0 BCAP ECO REG1 ① 4.7V Soft start Max 5ms ② SCL SDA DCDC2/ STBREG =VIN1 BSENS EN STBREG 1.25V 1.25V ACK A Slave Address DCDC2 STBREG 8.3V |
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