Specifications

Smart Machine Smart Decision
SIM5800_Hardware Design_V1.01 47 2018-10-08
 Total routing length < 50 mm recommended
 Spacing to all other signals = 2x line width
 Bus capacitance < 15 pF
Table 23: Line length of SD inside the module
Pin
Signal
Length(mm)
39
SD_CLK
14.24
40
SD_CMD
15.19
41
SD_DATA0
14.87
42
SD_DATA1
13.63
43
SD_DATA2
12.90
44
SD_DATA3
13.05
5.2.7 Audio
 Isolate from noise sources such as antenna, RF signals, SMPS, clocks, and other digital signals with
fast transients.
 All audio signal should away from the VBAT backflow path.
 Differential route for MIC1P with MIC1N, EAR_MICP with GND_EARMIC, REC_P with REC_N
and SPK_P with SPK_N.
 HPH output signals – not a differential pair; GND isolation between L and R
 SPKR output signals – route as differential pair with 20 mil trace widths with 8 Ω load.