Datasheet

Page 89 of 161
nRF8001 Product Specification
Revision 1.2
22.6 RF PHY testing
RF PHY testing can be performed using the UART interface command format as specified in Bluetooth
Core specification
v4.0, Volume 6, Part F, ‘Direct Test Mode’. Alternatively, DTM commands can be sent
over the ACI using the command DtmCommand.
When in Test mode, the RF PHY Direct test mode UART interface is active and can be connected to a
validated
Bluetooth low energy RF PHY tester or to a proprietary RF test system. A proprietary RF tester
must implement the Direct Test Mode commands and responses in the defined format
13
.
The UART test interface pins and electrical characteristics are described in Part A, section 5.2 on page 15
and section 7.3 on page 27
.
22.6.1 Transmitter constant carrier operation
The DTM can also be used to initiate a constant unmodulated carrier mode on the specified RF channel.
When initiated, this mode enables easy antenna and matching network tuning.
To initiate the constant carrier mode, the PKT
13.
field in the LSByte of the DTM command must be set to
binary value 11.
22.6.2 ACI loopback test
The ACI command Echo is used to test the physical connection of the ACI. Upon receiving the Echo
command, nRF8001 returns an
EchoEvent containing the identical content of the Echo command to the
application controller.
13. Bluetooth Core specification v4.0, Vol. 6, Part F, Section 3.3, ’Commands and Events’.