5 Pin Configuration and Functions

Figure 5-1 RTE Package, 20-Pin WQFN With Exposed Thermal Pad, Top View

Table 5-1 Pin Functions

PIN		TYPE	DESCRIPTION
NO.	NAME	TYPE	DESCRIPTION
1	NC	No connect	No connection
2	NC	No connect	No connection
3	PDMDIN1_GPI1	Digital input	Digital input 1 (multipurpose functions such as digital microphones data, PLL input clock source, and so forth).
4	PDMCLK_GPO1	Digital output	General-purpose digital output 1 (multipurpose functions such as digital microphone clock, interrupt, and so forth).
5	VSS	Ground supply	Device ground internally shorted to thermal pad. Short this package corner pin directly to the board ground plane. See the package drawing at the end of this document for corner pin dimensions.
6	SDOUT	Digital output	Audio serial data interface bus output.
7	BCLK	Digital I/O	Audio serial data interface bus bit clock.
8	FSYNC	Digital I/O	Audio serial data interface bus frame synchronization signal.
9	IOVDD	Digital supply	Digital I/O power supply (1.8 V or 3.3 V, nominal).
10	VSS	Ground supply	Device ground internally shorted to thermal pad. Short this package corner pin directly to the board ground plane. See the package drawing at the end of this document for corner pin dimensions.
11	GPIO1	Digital I/O	General-purpose digital input/output 1 (multipurpose functions such as digital microphones clock or data, PLL input clock source, interrupt, and so forth).
12	SDA	Digital I/O	Data pin for I²C control bus.
13	SCL	Digital input	Clock pin for I²C control bus.
14	DREG	Digital supply	Digital regulator output voltage for digital core supply (1.5 V, nominal). Connect a 10-μF and a 0.1-μF low ESR capacitor in parallel to the device ground (VSS).
15	VSS	Ground supply	Device ground internally shorted to thermal pad. Short this package corner pin directly to the board ground plane. See the package drawing at the end of this document for corner pin dimensions.
16	AVDD	Analog supply	Analog power (1.8 V or 3.3 V, nominal).
17	AREG	Analog supply	Analog on-chip regulator output voltage for analog supply (1.8 V, nominal) or external analog power (1.8 V, nominal). Connect a 10-μF and a 0.1-μF low ESR capacitor in parallel to the analog ground (AVSS).
18	VREF	Analog	Analog reference voltage filter output. Connect a 1-μF to the analog ground (AVSS).
19	PDMDIN2_GPI2	Analog output/digital input	Digital Input 2. MICBIAS output or general-purpose digital input 2 (multipurpose functions such as digital microphones data, MICBIAS, PLL input clock source, and so forth). If used as MICBIAS output, then connect a 1 μF to analog ground (AVSS)
20	VSS	Ground supply	Device ground internally shorted to thermal pad. Short this package corner pin directly to the board ground plane. See the package drawing at the end of this document for corner pin dimensions.
Thermal Pad	Thermal Pad (VSS)	Ground supply	Thermal pad is shorted to the internal device ground. Short the thermal pad directly to the board ground plane.