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32.768 KHz
DM388 Processor
Bo
a
rd
-to
-Bo
a
rd
C
o
n
n
e
ct
o
r
WiLink
TM
8
WL1837MOD
PMIC
TPS6591133
20 MHz
27 MHz
DNI
CLK32OUT_PMIC
EXT_32CLK
DEVOSC
MXI
DEVOSC
MXO
AUX
MXI
AUX
MXO
CLKOUT1
McASP1_AHCLKx
EMAC[0]_GMTCLK
MDIO_CLK
JTAG_TCK
MMC1_CLK
CAM_PCLK
CLKIN32
Copyright © 2016, Texas Instruments Incorporated
Clock Distribution
18
SPRUIC7 – December 2016
Copyright © 2016, Texas Instruments Incorporated
TMDSCSK388 Module Interface Details
3.1
Clock Distribution
The DM388 module contains the following reference clocks:
•
Y1 – 32.768-kHz real-time clock (RTC) to the power management IC (TPS6591133)
•
Y2 – 20-MHz crystal for the device oscillator inputs
•
Y3 – 27-MHz crystal for the auxiliary oscillator inputs
•
U5 – 32.768-KHz oscillator for the reference clock
The slow clock to the WLAN WiLink WL1837 module is provided by CLKOUT1 from the processor or by
CLK32OUT from the PMIC. The default clock is from PMIC.
shows the board-clock distribution circuit.
Figure 3-1. Clock Distribution