User's Manual

Smart Machine Smart Decision
SIM7600SA-H_User Manual_V1.00 2017-10-11
3.6.2 PCM Application Guide
The following figure shows the external codec reference design.
MODULE
PCM_IN
PCM_SYNC
PCM_CLK
PCM_OUT
33pF
ADCOUT
FS
BCLK
DACIN
MCLK
VDD_1V8
2.2K
2.2K
SCLK
SDIO
SCL
SDA
VDDA
VDDSPK
VDDD
3.3V
3.8V VDD_1V8
MIC+
MIC-
MICBIAS
MOUT
MIC
SPK
NAU8810
1.3K
1.3K
1uF
1uF
47uF
47uF
Figure 24: Audio codec reference circuit
3.7 SD Interface
SIM7600SA-H provides a 4-bit SD/MMC interface with clock rate up to 200 MHz, The voltage of
MMC/SD interface is 2.95V, which is compatible with SDIO Card Specification (version 3.0) and
Secure Digital (Physical Layer Specification, version 3.0).It supports up to 32GB SD cards.
Table 16: MMC/SD electronic characteristic (SD_DATA0-SD_DATA3 ， SD_CLK and
SD_CMD) *
Symbol
Parameter
Min.
Typ.
Max.
Unit
VDD_SD
LDO power output
voltage**
2.75
2.85
3.05
V
V
IH
High-level input voltage
0.65·VDD_EXT
-
VDD_EXT+0.3
V
V
IL
Low-level input voltage
-0.3
0
0.25·VDD_EXT
V
V
OH
High-level output voltage
VDD_EXT-0.4
2.85
VDD_EXT
V
V
OL
Low-level output voltage
0
0
0.45
V
Note:
*Be different from SD_DATA0-SD_DATA3 ， SD_CLK and SD_CMD ， SD_DET is 1.8V
operation voltage.
Customer should provide VDD_SD for SD card and the current should more than 350mA.
ESD/EMI components should be arranged beside SD card socket. Refer to the following
application circuit.