Laird DVK-SU60-2230C User Manual - page 14
DVK-SU60-2230C Development Kit
User Guide
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▪ PDn must be high for normal operation
An internal pull-up resister on this pin.
3.3.3 PMU_EN (SW7)
Enable input for internal PMU (Input) (Active Low).
0 – Disable the input for internal PMU.
1 – Normal mode
▪ PMU_EN can accept an input of 3.3 volts
▪ PMU_EN may be driven by the host
▪ PMU_EN must be high for normal operation
An internal pull-up resister on this pin.
Note: PCIE_W_DISABLE_N, PDn and PMU_EN were also wired to J23 for optional.
To view its location, refer to
Figure 1
.
3.4 4-wire UART Serial Interface
The development board provides access to the M.2 module 4-wire UART interface (TX, RX, CTS, RTS) either
through USB (via U7 FTDI USB-UART convertor chip) or through a breakout header connector J15, J16, J17 and
J18. Refer to
Figure 6
.
Note:
M.2 module provides 4-wire UART interface on the HW.
V
IH
is from 1.26V to 2.2V; V
IL
is from -0.4V to 0.54V.
3.4.1 UART Mapping
UART connection on the 50 and 60 series modules and FTDI IC are shown in table below. Refer to
Figure 6
to see
how the 50 and 60 series module UART is mapped to the breakout header connector (J15, J16, J17 and J18).
Table 4: UART mapping
M.2 Default Function
FTDI IC UART
BT_UART_RXD (output)
RXD
BT_UART_TXD (input)
TXD
BT_UART_CTS (output)
CTS
BT_UART_RTS (input)
RTS
3.4.2 UART Interface Driven by USB
▪ USB Connector – The development kit provides a USB Type micro-B connector (USB2) which allows
connection to any USB host device. The connector optionally supplies power to the development kit and
the USB signals are connected to a USB to serial convertor device (FT232R).
▪ USB–UART – The development kit is fitted with a (U7) FTDI FT232R USB to UART converter which provides
USB-to-Virtual COM port on any Windows PC (XP or later). Upon connection, Windows auto-installs the