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ISL22102IV20Z Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL22102IV20Z Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 12 page 8 FN6788.2 September 21, 2015 VTH This terminal allows to set up the threshold level of audio input to be detected. When audio input to either Left or Right channel is below this threshold - the FLAG output is Low; when audio input is above this threshold - the FLAG output is High. The threshold level is maintained over an external resistor RTH placed between VTH pin, which is a source of ±10µA current, and VB pin. To calculate the actual threshold we need to multiply 10µA by a resistor value and divide the result by 1000. For example, a 100k resistor is a subject of 1mV audio detection threshold, e.g. 10µA*100k/1000 = 1mV. Note, the VTH threshold multiplied by 1000 should not exceed 1/2 of AVCC. The maximum resistor value for detection threshold can be found in Table 2. Device Operation There are four sections in the ISL22102: the input control, counter and decode section, two resistor arrays with buffered wiper outputs, reference voltage generator of VB output, and audio detection block with programmable delay FLAG output. The input control section operates just like an up/down counter. The output of this counter is decoded to turn on a single electronic switch, connecting a point on the resistor array to the wiper output. Each resistor array is comprised of 31 individual resistors connected in series and its wiper output pass an attenuated audio input to the power amplifier. Both resistor arrays have logarithmic taper with -72dB dynamic range as shown in Table 2. The ISL22102 is designed to interface directly to two push-button switches for effectively moving the wipers up or down. The UP and DN inputs increment or decrement 5-bit counters respectively. The output of these counters are decoded to select one of the thirty-two wiper positions along the resistive array. The wiper increment input, UP, and the wiper decrement input, DN, are both connected to an internal pull-up so that they normally remain High. When pulled Low by an external push button switch or a logic Low level input, the wipers will be switched to the next adjacent tap position. Internal debounce circuitry prevents inadvertent switching of the wipers position if UP or DN remain Low for less than 15ms, typical. Each of the buttons can be pushed either once for a single increment/decrement or continuously for a multiple increments/decrements. When making a continuous push, after the first second, the device is going to auto increment/decrement mode. If the button is held for longer than 1s, the wiper position will be auto incremented/decremented with a rate of 4Hz for 4s, and with a rate of 8Hz after that. As soon as the button is released, the ISL22102 will return to a low power standby condition. Each wiper acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. Table 3 contains information about attenuation level for each tap position. TABLE 2. RTH vs AVCC AVCC (V) MAX RTH (k) 5.5 188 5.25 177 5.0 167 4.75 156 4.5 146 4.25 135 4.0 125 3.75 115 3.5 104 3.25 94 3.0 83 2.75 73 TABLE 3. WIPER TAP POSITION vs ATTENUATION TAP POSITION ATTENUATION 00 1-2dB 2-4dB 3-6dB 4-8dB 5 -10dB 6 -12dB 7 -14dB 8 -16dB 9 -18dB 10 -20dB 11 -22dB 12 -24dB 13 -26dB 14 -28dB 15 -30dB 16 -32dB 17 -34dB 18 -36dB 19 -38dB 20 -40dB 21 -42dB 22 -44dB 23 -46dB 24 -48dB ISL22102 |
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