Pcm Application Guide; I2C Interface - SimCom SIM7000 Hardware Design

3.6.2

PCM Application Guide

The following figure shows the external codec reference design.
MODULE
3.7

I2C Interface

SIM7000 provides an I2C interface compatible with I2C specification, version 5.0, with clock rate
up to 400 kbps. Its operation voltage is 1.8V.
The following figure shows the I2C bus reference design.
The I2C signal has no pull-up resistors in module. So the pulling up resistors 2.2KΩ to
VDD_EXT are necessary in application circuit.
SIM7000 _Hardware Design _V1.04
VDD _ EXT
2.2K
2.2K
PCM _ IN
PCM _ OUT
PCM _ SYNC
PCM _ CLK
I2C_ SCL
I2C_ SDA
33pF
Figure 22: Audio codec reference circuit
2.2K
I2C_SCL
I2C_SDA
GND
MODULE
Figure 23: I2C reference circuit
Smart Machine Smart Decision
3.3V 3.8V VDD _ EXT
VDDA
VDDSPK
VDDD
ADCOUT
MICBIAS
DACIN
FS
MIC+
MIC-
BCLK
MCLK
MOUT
SCLK
SDIO
NAU88C10
VDD_EXT
2.2K
SCL
SDA
GND
DEVICE
2.2K
1uF
1uF
MIC
2.2K
47uF
47uF
SPK
2018-1-31