WM8959 Wolfson Microelectronics Ltd., WM8959 Datasheet - Page 72

• Manufacturer Part Number: WM8959
• Description: Mobile Multimedia DAC with Dual-mode Class AB/D Speaker Driver
• Manufacturer: Wolfson Microelectronics Ltd.

WM8959
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GENERAL PURPOSE INPUT/OUTPUT
The WM8959 provides a number of versatile GPIO functions to enable features such as mobile TV
support, Wi-Fi voice call recording, button and accessory detection and clock output.
The WM8959 has six multi-purpose pins for these functions.
The following functions are available on some or all of the GPIO pins.
The functions available on each of the GPIO pins are identified in Table 36.
Table 36 Functions Available on GPIO Pins
The GPIO pins are configured by a combination of register settings described in Table 37 to Table 40
in the following section. The order of precedence for the control of the GPIO pins is as listed below.
BCLK2
DACLRC2
DACDAT2
Button/Accessory Detect Input
Clock Output
Temperature OK
PLL Lock
Logic 1 and Logic 0
Interrupt
SDOUT (Readback Data)
Pull-up and Pull-down Available
•
•
•
•
•
•
•
•
•
•
•
1. Pin pull-up or pull-down (GPIOn_PU, GPIOn_PD)
2. Audio Interface and GPIO Tristate (AIF_TRIS)
3. Pin configuration (AIFSEL and GPIO1_ENA)
4. GPIO functionality (GPIOn_SEL)
GPIO PIN FUNCTION
GPIO1, GPIO3, GPIO4 and GPIO5: Dedicated GPIO pins.
LIN3/GPI7 and RIN3/GPI8: Analogue inputs or button/accessory detect inputs.
Alternative DAC interface (DACDAT, DACLRC, BCLK)
Button detect (latched with programmable de-bounce)
MICBIAS / Accessory current or short circuit detect
Clock output
Temperature sensor output
PLL lock output
Logic '1' and logic '0' output
Interrupt event output
Serial data output (register readback)
GPIO1
Y
Y
Y
Y
Y
Y
Y
Y
GPIO3
Y
Y
Y
Y
Y
Y
Y
Y
Y
GPIO4
Y
Y
Y
Y
Y
Y
Y
Y
Y
GPIO PINS
GPIO5
Y
Y
Y
Y
Y
Y
Y
Y
Y
PP, May 2008, Rev 3.1
Pre-Production
GPI7
Y
GPI8
72
Y