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HPM10W29A100G Datasheet(PDF) 11 Page - ON Semiconductor |
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HPM10W29A100G Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 17 page  HPM10 www.onsemi.com 11 • Periodically monitor pin VHA using its on−board ADC • Monitor SWOUT to determine button press events • Monitor the WARN to determine if the hearing aid has been placed in cradle, in which case the DSP should shut itself down gracefully before HPM10 cuts the power to VHA. • Toggle pin DS_EN to logical high (VHA level), if it needs to put HPM10 into Deep Sleep Mode (*): CLKDIV can be configured by the DSP (through GPIO for example) or through physical connection. In Hearing Aid Mode, voltage monitoring is used to prevent turn−on if battery voltage is not acceptable, and to control the output mode of the VHA supply. The voltage levels and modes are as follows: • 1.0 V to 1.5 V The battery type could be AgZn, Zn−Air, or NiMH. A low impedance switch connects VBAT to VHA to power the DSP. • 1.5 to 2.2 V The battery type is likely AgZn. If pin AGZN_REG_EN=floating, then the VHA voltage is powered by a 1.5 V regulator. This is to protect those DSPs that are not able to handle the unregulated AgZn voltage. For those DSP that can handle maximum AgZn battery voltages, the pin AGZN_REG_EN=0V will enable the low impedance switch between VBAT and VHA. • 3.0 V and above. The battery type is Li_Ion. VHA is powered by a divide by 3 step down converter. VBAT voltages outside of these ranges will not enable the VHA, and the DSP will not be powered. Note that each of these thresholds have hysteresis to ensure stable operation. The following figure indicates how HPM10 monitors voltage in Hearing Aid Mode. 1.1V 2.0V 3.0 4.0 1.65V 1.2V 2.2V ZnAir AgZn Li_Ion (ONLY _LI =0) VBAT VBAT 4.3V 3.0V Charge Pump 4.3V 1.05V_ 1.43V 1.1V 2.2V VHA Li −Ion Li_Ion (ONLY _LI =1) 4.3V 1.0V 1.5V VHA ZnAir /AgZn regulator disabled regulator enabled 1.0 2.0 VHA 2.0 1.0 Figure 4. Hearing Aid Mode: Voltage Monitoring |
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Similar Description - HPM10W29A100G |
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