User's Manual

u-blox
Copyright © 2014 u-blox AG Page 7 of 24
3.5.2 Bluetooth UART
The module incorporates one UART dedicated to the Bluetooth Host Controller Interface (HCI) transport layer. The HCI interface is used to
transport commands, events, ACL and synchronous data between the device and its host using HCI data packets.
The following HCI transport layers are supported (detected automatically when communication starts):
HCI four-wire (H4)
HCI three-wire (H5)
The HCI interface has a 256 byte receive buffer and supports most baud rates, including all normal PC rates, up to a maximum of 4 Mbps.
After power-up, the baud rate is set for 115.2kbps. The maximum baud rate deviation supported is -2.5%, +1.5%.
The baud rate can be changed with a vendor specific command. The module responds with a Command Complete Event (still at
115.2kbps), after which the baud rate change takes place. The only parameter needed is the desired baud rate.
HCI hardware includes the following features:
Receiver detection of break, idle, framing, FIFO overflow, and parity error conditions
Transmitter underflow detection
CTR/RTS hardware flow control (H4)
XON/XOFF soft flow control (H5)
Parameter Values
Baud rates Min: 37.5 kbps
Max: 4000 kbps
Default baud rate 115.2 kbps
Data bits 8
Stop bits 1
Parity none
Flow control None, XON/XOFF, CTS/RTS
3.6 Environmental Characteristics
Parameter Min Typ Max Unit
Storage temperature -40 +95 degC
Operating temperature -40 +85 degC
3.7 Mechanical Characteristics
Parameter Value type Value Unit
Weight Typ 1.5 g
Outline dimension Typ 22.3 x 14.8 x 2.9 (+/- 0.1 mm) mm