What is the difference in the charging operation of S6AE101A and S6AE102A/103A?
S6AE101A supports a single VSTORE pin to charge a single storage device, which can be a small capacitance such as a ceramic capacitor or a large capacitance such as electric double-layer capacitor (EDLC).
The VSTORE pin connects the small capacitance to operate the system. When there is no ambient light, the large capacitor such as EDLC is connected to the VSTORE pin. However, it takes a long startup time to charge the EDLC to the voltage level for powering the system.
S6AE102A and S6AE103A support dual VSTORE pins to efficiently charge two storage devices using environment energy such as from a solar cell. The energy first charges the main storage device connected to the VSTORE1 pin to operate the system; any extra energy is used to charge the sub-storage device connected to the VSTORE2 pin. Normally, the small capacitance is used as the main storage device to reduce the startup time. The energy in the large capacitance of the sub-storage device is supplied to the system when there is no ambient light.
The following sections show an example block diagram and waveform of charging operation for each device.
[ Example ]
Input source: Solar Cell
Storage device1: 400 µF Ceramic Capacitor
Storage device2: 500 mF EDLC
Output voltage: VOUTH = 2.5 V, VOUTL = 1.8 V
Figure 1. Block Diagram for S6AE101A with Large Capacitance
Figure 2. Charging waveform for S6AE101A with large capacitance
Figure 3. Block Diagram for S6AE102A or S6AE103A
Figure 4. Charging waveform for S6AE102A and S6AE103A