Datasheet
LM49370
SNAS356D –FEBRUARY 2007–REVISED MARCH 2012
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Pin Descriptions
Pin Pin Name Type Direction Description
A1 EP_NEG Analog Output Earpiece negative output
A2 A_V
DD
Supply Input Headphone and mixer
V
DD
A3 INT_MIC_POS Analog Input Internal microphone
positive input
A4 PCM_SDO Digital Output PCM Serial Data Output
A5 PCM_CLK Digital Inout PCM clock signal
A6 PCM_SYNC Digital Inout PCM sync signal
A7 PCM_SDI Digital Input PCM Serial Data Input
B1 A_V
SS
Supply Input Headphone and mixer
ground
B2 EP_POS Analog Output Earpiece positive output
B3 INT_MIC_NEG Analog Input Internal microphone
negative input
B4 BYPASS Analog Input A_V
DD
/2 filter point
If SPI_MODE = 1, then
B5 TEST_MODE/CS Digital Input
this pin becomes CS.
B6 PLL_FILT Analog Input Filter point for PLL VCO
input
B7 PLL_V
DD
Supply Input PLL V
DD
C1 HP_R Analog Output Headphone Right Output
C2 EXT_BIAS Analog Output External microphone
supply (2.0/2.5/2.8/3.3V)
C3 INT_BIAS Analog Output Internal microphone
supply (2.0/2.5/2.8/3.3V)
C4 AUX_R Analog Input Right Analog Input
C5 GPIO_2 Digital Inout General Purpose I/O 2
C6 SDA Digital Inout Control Data, I2C_SDA or
SPI_SDA
C7 SCL Digital Input Control Clock, I2C_SCL or
SPI_SCL
D1 HP_L Analog Output Headphone Left Output
D2 VREF_FLT Analog Inout Filter point for the
microphone power supply
D3 EXT_MIC Analog Input External microphone input
D4 SPI_MODE Digital Input Control mode select 1 =
SPI, 0 = I2C
D5 GPIO_1 Digital Inout General Purpose I/O 1
D6 BB_V
DD
Supply Input Baseband V
DD
for the
digital I/Os
D7 D_V
DD
Supply Input Digital V
DD
E1 HP_VMID Analog Inout Virtual Ground for
Headphones in OCL
mode, otherwise 1st
headset detection input
E2 MIC_DET Analog Input Headset insertion/removal
and microphone presence
detection input.
E3 AUX_L Analog Input Left Analog Input
E4 CPI_NEG Analog Input Cell Phone analog input
negative
E5 IRQ Digital Output Interrupt request signal
(NOT open drain)
E6 I2S_SDO Digital Output I2S Serial Data Out
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