User's Manual

BL652
Datasheet
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
36
© Copyright 2016 Laird. All Rights Reserved
Americas: [phone]
Europe: [phone]
Hong Kong: [phone]
– Date rate 106 kbps
– NFC-A tag (can only be a target/tag; cannot be an initiator)
 Modes of Operation:
– Disable
– Sense
– Activated
5.5.1 Use Cases
 Touch-to Pair with NFC
 Launch a smartphone app (on Android)
 NFC enabled Out-of-Band Pairing
 System Wake-On-Field function
– Proximity Detection
UART Interface
The Universal Asynchronous Receiver/Transmitter offers fast, full-duplex, asynchronous serial communication
with built-in flow control support (UART_CTS, UART_RTS) in HW up to one Mbps baud. Parity checking and
generation for the ninth data bit are supported.
UART_TX, UART_RX, UART_RTS, and UART_CTS form a conventional asynchronous serial data port with
handshaking. The interface is designed to operate correctly when connected to other UART devices such as the
16550A. The signaling levels are nominal 0 V and 3.3 V (tracks VCC) and are inverted with respect to the signaling
on an RS232 cable.
Two-way hardware flow control is implemented by UART_RTS and UART_CTS. UART_RTS is an output and
UART_CTS is an input. Both are active low.
These signals operate according to normal industry convention. UART_RX, UART_TX, UART_CTS, UART_RTS are
all 3.3 V level logic (tracks VCC). For example, when RX and TX are idle they sit at 3.3 V. Conversely for
handshaking pins CTS, RTS at 0 V is treated as an assertion.
The module communicates with the customer application using the following signals:
 Port/TxD of the application sends data to the module’s UART_RX signal line
 Port/RxD of the application receives data from the module’s UART_TX signal line
Figure 6: UART signals
Note: The BL652 serial module output is at 3.3V CMOS logic levels (tracks VCC). Level conversion must be
added to interface with an RS-232 level compliant interface.
BL652