DM388
Processor
Voltage Level
Translator
TXS0108ERGYR
Voltage Level
Translator (x3)
SN74AVC4T245
WiLink
TM
8 Wi-Fi
Module
WL1837MOD
MMC0_DAT[0:3]
MMC0_CLK
MMC0_CMD
1.8 V
3.3 V
3.3 V
1.8 V
3.3 V
1.8 V
UART2_TXD
UART2_RXD
BT_EN
WLAN_EN
WLAN_IRQ
WLAN_CLOCKOUT1
McASP0_AXR1
McASP0_AXR0
McASP0_AFSX
McASP0_ACLKX
WL_SDIO
BT_HCI
EN, CLK, IRQ
EXT_32K
BT_AUD
VBAT
VIO
RF_ANT1
RF_ANT2
UART3
EN, CLK, IRQ
McASP0
Muxer
SN74CBTLV3257RGYR
UART2_TXD
UART2_RXD
CAM_FLD
CAM_PCLK
(To Board-to-Board
Connector)
U
AR
T
2
_
R
T
Sn
U
AR
T
2
_
C
T
Sn
Copyright © 2016, Texas Instruments Incorporated
Wi-Fi and BT Interface
23
SPRUIC7 – December 2016
Copyright © 2016, Texas Instruments Incorporated
TMDSCSK388 Module Interface Details
3.6
Wi-Fi and BT Interface
The WiLink 8 module is a WLAN baseband processor and RF transceiver support of IEEE standard
802.11a, 802.11b, 802.11g, and 802.11n. The device can be configured for 20-MHz or 40-MHz SISO, and
20-MHz 2 × 2 MIMO at 2.4 GHz for high throughput (80 Mbps [TCP] and 100 Mbps [UDP]). The device
supports a 4-bit SDIO host interface.
Flow controls signals of UART2 (RTSn and CTSn) are muxed with the camera field and pixel-clock
signals; a multiplexer, U4 (SN74CVTLV3257RGYR), is used to separate those signals. UART signals are
fed to the voltage translators, and CAM signals are connected to board-to-board connectors. Four voltage
level translators (TXS0108ERHYR [U3] for MMC, SN74AVC4T245[U2, U5, U12] for McASP, UART, EN,
CLK, and IRQ) convert I/O voltages of the DM388 (3.3 V) to I/O voltages of the Wi-Fi module (1.8 V).
shows the Wi-Fi and BT interface.
Figure 3-5. Wi-Fi and BT Interface