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HPM10 Datasheet(PDF) 10 Page - ON Semiconductor |
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HPM10 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 17 page HPM10 www.onsemi.com 10 HPM10 Working Modes HPM10 has three working modes represented in the state machine below. Hearing Aid (HA ) Cradle Mode (CM) DS _EN =1 SAFE _MODE =0 Deep Sleep (DS) SAFE _MODE=1 & CH_CONN =0 & SWIN =1 CH_CONN= 1 CH_CONN =0 CH _CONN=1 SAFE_MODE=1 & CH_CONN=0 & NO_BUTTON=1 Figure 3. HPM10 State Machine Deep Sleep Mode: A low power mode with all blocks turned off. HPM10 can enter Deep Sleep Mode in one of three ways: • From Hearing Aid Mode when the host DSP toggles the DS_EN pin high. An example use−case for this transition is when a program is running on the host DSP, that determines that the hearing aid is not being worn or the measured battery voltage is below a specified value and puts the system into Deep Sleep Mode to save power. • From Hearing Aid Mode when the battery voltage drops below the EOL set point (VEOL level), for the battery chemistry actively being used to avoid irreversible battery damage. This is when VBAT<1.0 V (for AgZN) or 2.2 V<VBAT<3.0 V (for Lithium−Ion). This will draw the SAFE_MODE status bit to 0. • From Cradle Mode when the hearing aid charger is removed, in case the OTP bit “no_button” is not set. Cradle Mode: The hearing aid will enter in Cradle Mode when the hearing Aid is physically connected to Cradle (CH_CONN=1). In this mode, the hearing aid battery is being charged. Once in this state, the following sequence of processes will occur: • The OTP is enabled and its contents are copied to internal latches. • After the OTP contents have been read, a Cyclic Redundancy Check (CRC) is made by the controller. If it fails, the system transitions to completion phase in Cradle Mode and an error flag is set. • If the CRC passes, the controller starts the charging process. The charging process is controlled by a controller and firmware in ROM. Hearing Aid Mode: The hearing aid DSP power is supplied by HPM10 and there is no digital logic running on HPM10. In this mode, the hearing aid is in normal operation mode and receives its supply voltage from HPM10. HPM10 can enter Hearing Aid Mode in two ways: • From Deep Sleep after SWIN goes high from a button press. The battery voltage must be in a valid range. • From Cradle Mode after removed from Cradle with OTP bit NO_BUTTON=1. The battery voltage must be in a valid range.HPM10 is either clocked with the Hearing Aid Mode Oscillator, or with the divided EXT_CLK. The recommended tasks for the host DSP in Hearing Aid Mode are as follows: • Set the external clock division ratio (if desired) by driving the 3 CLKDIV pins (*) • Apply a valid clock to EXT_CLK pin |
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