Patent ID: 11860706
Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 5:
6. The power management IC according to claim 5,
wherein the accessory includes an accessory battery and a signal processing circuit, the accessory battery being chargeable by the charging signal, the signal processing circuit being able to process the charging signal inputted from the case and switch into a sleep state,
the plurality of operations include an initialization operation, a charging operation, and a communication operation, the initialization operation initializing a system of the accessory, the charging operation charging the accessory battery, the communication operation providing one-way communication from the case to the requested-operation determination circuit and two-way communication between the signal processing circuit and the case,
when the voltage level has remained higher than the reference voltage and lower than the preset first threshold voltage for the preset first threshold period, the requested-operation determination circuit determines that the one operation is the communication operation,
when the voltage level has remained not lower than the preset first threshold voltage for the preset second threshold period, the requested-operation determination circuit determines that the one operation is the charging operation, and,
when the voltage level has remained not lower than the preset second threshold voltage for the preset third threshold period, the requested-operation determination circuit determines that the one operation is the initialization operation, the preset second threshold voltage being set higher than the preset first threshold voltage.