alc262w-vd2-gr Realtek Semiconductor Corporation, alc262w-vd2-gr Datasheet - Page 83

• Manufacturer Part Number: alc262w-vd2-gr
• Description: 4-channel Dac And 6-channel Adc High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

10.3. Volume Control Via GPIO0/GPIO1
Detected low pulses generated at GPIO0 and GPIO1 are used to calculate the Up and Down count into 7
bits of volume steps. ‘Mute’ is also sampled to toggle the mute status. Hardware will not adjust volume.
The count value will be reported via unsolicited response to software to control the master volume.
10.4. Digital Microphone Implementation
This section describes the ALC262 digital microphone implementation. There is one Clock output pin
and 1 Data input pin in the ALC262. The ALC262 provides the clock signal to the digital microphone.
When the digital microphone receives the external sound input, it converts the analog signals to digital in
a 1-bit format. The 1-bit data is delivered to the codec though the data input pin. The Digital Filter in the
audio codec converts the 1-bit data stream into Pulse Code Modulation (PCM) data. The PCM data is sent
to the HDA controller through the HDA link.
4-Ch DAC and 6-Ch ADC High Definition Audio Code
Up
4.7K
Down
4.7K
+3.3V (VCC)
Figure 24. Volume Control via GPIO0 and GPIO1
Figure 25. Digital Microphone Implementation-1
Mute
GPIO0 (pin 43)
GPIO1 (pin 44)
50K
74
+3.3 (VCC)
ALC262
50K
Up: Counter+1
Dn:Counter-1
Track ID: JATR-1076-21
0~127
Volume[6:0]
ALC262 Series
Datasheet
Rev. 1.9