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ISL22102 Arkusz danych(PDF) 7 Page - Intersil Corporation |
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ISL22102 Arkusz danych(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN6788.0 September 29, 2008 Pin Descriptions LEFT_IN, RIGHT_IN The LEFT_IN and RIGHT_IN pins of the ISL22102 are equivalent to the fixed terminals of a mechanical potentiometer. The stereo audio signal applied to these pins are referenced to VB and may have ±AVCC/2 maximum amplitude. LEFT_OUT, RIGHT_OUT The LEFT_OUT and RIGHT_OUT pins are the buffered wiper terminals of the potentiometers which are equivalent to the movable terminals of a mechanical potentiometers with attached unity gain operational amplifiers (Op Amp). The default output position of wiper terminals preset to -20dB attenuation of input signals. VB This is reference voltage output equal AVCC/2. It is used as common point for audio inputs, as well as reference signal for other system components. UP The debounced active low UP input is increment the wipers position of both channels. An on-chip 2µA current source pull-up holds the UP input High. A switch closure to ground or a Low logic level will after a debounce time and Zero Amplitude Crossing Detection, move the wiper to the next adjacent higher tap position. If the UP input signal is held down for 1s, the wipers will auto increment their position with a 4Hz frequency rate for 4s, and then a 8Hz frequency rate (see Figure 2). When the wipers reach their top position of 0dB attenuation, they will stay at this position ignoring any further Up commands. DN The debounced DN input is decrement the wipers position of both channels. An on-chip 2µA current source pull-up holds the DN input High. A switch closure to ground or a Low logic level will, after a debounce time and Zero Amplitude Crossing Detection, move the wiper to the next adjacent lower tap position. If DN input signal is held down for 1s, the wipers will auto decrement their position with a 4Hz frequency rate for 4s, and then a 8Hz frequency rate. When the wipers reach their bottom position of -90dB attenuation, they will stay at this position ignoring any further Down or Mute commands. MUTE The active low MUTE input allows to move both wipers, after a debounce time and Zero Amplitude Crossing Detection, to the highest attenuation level of -90dB in one step. An on-chip 2µA current source pull-up holds the MUTE input High. When MUTE is released, both wipers will be set at position having prior Mute command. SB The active low SB input allows totally disconnect DCP arrays from their LEFT_IN and RIGHT_IN pins, and move both wipers to position closest to VB pin (as shown in Figure 3). It also sets ISL22102 in low power Standby mode. When SB will be released, the both wipers will be set at position they have prior Standby. . FLAG This output pin provides status information to the rest of the system about audio activity. It is High when at least one audio input exceeds VTH threshold, otherwise its output level is Low. The FLAG output can be directly connected to SB pin for automatical setting the ISL22102 in Standby mode. D0-D2 These three digital input pins allow to program a delay time for FLAG Low output up to 240s. Table 1 lists the D0-D2 settings and corresponding delay times (typical values). CB This low pass filter terminal requires an external capacitor to GND. The value of this capacitor, together with 5M Ω internal resistor divider, directly determines the PSRR (Power Supply Rejection Ratio) of audio and VB outputs. A 1µF to 10µF capacitor is recommended. HPA, HPB These two high pass filter terminals require an external capacitor of 100nF or higher in-between. TABLE 1. FLAG PROGRAMMED DELAY SETTINGS D2 D1 D0 DELAY, (s) 000 0 001 60 010 90 011 120 100 150 101 180 110 210 111 240 VB WIPER_LEFT LEFT_IN FIGURE 3. DCP CONNECTION IN STANDBY MODE (RIGHT_IN) (WIPER_RIGHT) ISL22102 |
Podobny numer części - ISL22102 |
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Podobny opis - ISL22102 |
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