Datasheet

Page 28 of 161
nRF8001 Product Specification
Revision 1.2
7.3.1 Direct Test Mode interface characteristics
The DTM UART interface features:
• Two-wire UART interface (TXD/RXD)
• Baud rate: 19200
• 8 data bits
•No parity
• 1 stop bit
• No flow control (meaning no RTS/CTS)
7.3.2 Functional description
The DTM is activated using the Application Controller Interface (ACI), see Section 24.1 on page 96 for
more information. When active, the nRF8001
Bluetooth low energy radio is controlled by 2 byte commands
on the Two-wire UART interface (pins
TXD and RXD) or alternatively, over the ACI. See the Bluetooth Core
specification
v4.0, Vol 6, part F, for command word format and options.
When the DTM is active, the nRF8001 stack features are disabled. To exit test mode and return to normal
operation, the ACI command Test (ExitTestMode) or a device reset can be used.