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SB3229-E1-T Datasheet(PDF) 9 Page - ON Semiconductor |
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SB3229-E1-T Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 17 page  RHYTHM SB3229 www.onsemi.com 9 Figure 6. Adaptive Feedback Canceller (AFC) Block Diagram G Σ H’ H + − Feedback path Estimated feedback Volume Control, Trimmers and Switches External Volume Control The volume of the device can either be set statically via software or controlled externally via a physical interface. SB3229 supports both analog and digital volume control functionality, although only one can be enabled at a time. Digital control is supported with either a momentary switch or a rocker switch. In the latter case, the rocker switch can also be used to control memory selects. Analog Volume Control Both the external (analog) volume control and trimmers work with a three−terminal 100 k W – 360 kW variable resistor. The volume control can have either a log or linear taper, which is selectable via software. It is possible to use a VC with up to 1 M W of resistance, but this could result in a slight decrease in the resolution of the taper. Trimmers The trimmer interface provides the ability to control up to 19 hearing aid parameters through up to four trimmers. A single trimmer parameter can have up to 16 values and a single trimmer can control multiple parameters (e.g., Trimmer 1 can control compression ratio in all four channels simultaneously). The trimmer must be three−terminal 100 k W to 360 kW variable resistors and have a linear taper. Parameters that can be assigned to trimmers include Low Cut, High Cut, Compression Ratio, Wideband Gain, Tinnitus (Noise Level, Low Cut Filter, High Cut Filter) Crossover Frequency, Lower Threshold, Upper Threshold, EQ Gain, Squelch Threshold, High Level Gain, Low Level Gain, AGC−O Threshold, Static Volume Control and Peak Clipper Threshold. Digital Volume Control The digital volume control makes use of two pins for volume control adjustment, VC and D_VC, with momentary switches connected to each. Closure of the switch to the VC pin indicates a gain increase while closure to the D_VC pin indicates a gain decrease. Figure 7 shows how to wire the digital volume control to SB3229. Figure 7. Wiring for Digital Volume Control D_VC VC GND Memory Select Switches One or two, two−pole Memory Select (MS) switches can be used with SB3229. This enables user s tremendous flexibility in switching between configurations. Up to four memories can be configured and selected by the MS switches on SB3229. Memory A must always be valid. The MS switches are either momentary or static and are fully configurable through IDS in the IDS setting tab. The behavior of the MS switches is controlled by two main parameters in IDS: MSSmode: this mode determines whether a connected switch is momentary or static. Donly: this parameter determines whether the MS2 switch is dedicated to the last memory position . There are four basic MS switch modes of operation as shown in Table 4 below. Table 4. MS SWITCH MODES MS Switch Mode MS1 Switch MS2 Switch Max # of Valid Memories Donly MSSMode Use Mode 1 Momentary None 4 Off Momentary Simplest configuration Mode 2 Momentary Static 4 On Momentary Jump to last memory Mode 3 Static Static 4 Off Static Binary selection of memory Mode 4 Static Static 3 On Static Jump to last memory The flexibility of the MS switches is further increased by allowing the MS switches to be wired to GND or VBAT, corresponding to an active low or active high logic level on the MS pins. This option is configured with the MSPullUpDown/MS2PullUpDown setting in the IDS settings tab as shown in Table 5 below. |
Número de pieza similar - SB3229-E1-T |
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Descripción similar - SB3229-E1-T |
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