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ML7202-001 Datasheet(PDF) 5 Page - LAPIS Semiconductor Co., Ltd. |
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ML7202-001 Datasheet(HTML) 5 Page - LAPIS Semiconductor Co., Ltd. |
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5 / 65 page  FEDL7202-001-01 ML7202-001 5/65 Pin Symbol I/O PDN/RST =”0” Description 19 VOXO1 O “0” Output pin for the VOX function on the transmit side of channel 1. This pin is enabled when CR21-B7 (VOX_ON1) is set to “1”. This pin is used for identifying the voice/silence state by detecting the power of the transmit signal. At detection of voice, a logic “1” is output to this pin and at detection of silence, logic “0” is output. CR21-B6 and B5 (VOX_ON_LVL11 and_ VOX_ON_LVL01) are used for setting the threshold to be identified. This signal is also output to CR5-B2 (VOX_OUT1). Figure 4 shows the timing diagram for the VOX function. The transmit signal refers to the PCMLNI1 pin input signal. 20 VOXI1 I I Input pin for the VOX function on the receive side (line echo canceler RinL1 side) of channel 1. This pin is enabled when CR21-B7 (VOX_ON1) is set to “1”. When this pin is a logic “1”, receive side speech signals are fed to the RinL1. When this pin is a logic “0”, the background noise generator’s output is fed to the RinL1 instead of the receive side speech signals. Use CR21-B1 and B0 (RX_NOISE_LVL11 and RX_NOISE_LVL01) for setting the level of the background noise. Set CR21-B2 (VOX_IN1) to “0” when using this pin, since this pin is OR’ed with CR21-B2 (VOX_IN1) internally. When the application has a means to detect silence with the receive side speech signals, this function could be made use of as comfort noise generator. 21 VOXO2 O “0” Output pin for the VOX function on the transmit side of channel 2. This pin is enabled when CR22-B7 (VOX_ON2) is set to “1”. This pin is used for identifying the voice/silence state by detecting the power of the transmit signal. At detection of voice, a logic “1” is output to this pin and at detection of silence, logic “0” is output. CR22-B6 and B5 (VOX_ON_LVL12 and_ VOX_ON_LVL02) are used for setting the threshold to be identified. This signal is also output to CR5-B6 (VOX_OUT2). Figure 4 shows the timing diagram for the VOX function. The transmit signal refers to the PCMLNI2 pin input signal. 22 VOXI2 I I Input pin for the VOX function on the receive side (line echo canceler RinL2 side) of channel 2. This pin is enabled when CR22-B7 (VOX_ON2) is set to “1”. When this pin is a logic “1”, receive side speech signals are fed to the RinL2. When this pin is a logic “0”, the background noise generator’s output is fed to the RinL2 instead of the receive side speech signals. Use CR22-B1 and B0 (RX_NOISE_LVL12 and RX_NOISE_LVL02) for setting the level of the background noise. Set CR22-B2 (VOX_IN2) to “0” when using this pin, since this pin is OR’ed with CR22-B2 (VOX_IN2) internally. When the application has a means to detect silence with the receive side speech signals, this function could be made use of as comfort noise generator. 23 INT O “1” Interrupt request output pin. An interrupt is generated when the transmit/receive tone detector in each channel detects a tone signal of 2100 Hz (default). An interrupt also is generated when the state changes from tone detection to non-detection of 2100 Hz (default). When an interrupt event occurs, the pin outputs a logic “0” for 0.7 s. When the interrupt event remains unchanged, the pin outputs a logic “1”. By reading CR4-B3 to B0, it is possible to identify the detected channel and the path (on the transmit side/receive side). |
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