Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Product Specification
Bluetooth Radio
Fully embedded Bluetooth v2.0 Serial Profile
Class 2 radio
Complete RF ready module
Wireless data communications
Integrated chip antenna
128-bit encryption security
Range up to 30m LOS
FCC & Bluetooth qualified
Features
Description
256K bytes flash memory
64K bytes RAM memory
ST Micro ARM microprocessor up to 50MHz
Memory
The BT-120/121 is a serial adapter that provides fully
embedded, ready to use Bluetooth wireless technology. The
reprogrammable flash memory contains embedded firmware
for serial cable replacement using the Bluetooth SPP profile.
Other popular Bluetooth profiles, such as OBEX, are also
available.
Data Rate
2M bps maximum data rate
Multipoint capability
Serial Interface
UART, up to 921K baud
Customized firmware for peripheral device interaction, power
optimization, security, and other proprietary features may be
supported and can be ordered pre-loaded and configured.
User Interface
AT command set
Additional Documentation
BT-21 Datasheet
abSerial User Guide
abSerial Reference Guide
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-120/121 Datasheet
Page 1 of 6
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Software Architecture
Upper Layer Stack
SPP, OBEX, SDAP, GAP, and DUN protocols
RFComm, SDP, and L2CAP supported
Lower Layer Stack
HCI Interface
Bluetooth v2.0 specification compliant
HCI UART transport layer (H4)
Firmware upgrade over UART
APPLICATIONS
UPPER LAYER STACK
COMMANDS
EVENTS
ARM7
CPU
HCI
LM
FLASH
MEMORY
BASEBAND
RF
HCI STACK
Full Bluetooth v2.0 data rate (3M bps maximum)
Device power modes—active, sleep and deep sleep
Wake on Bluetooth feature—optimized power consumption of host
CPU
Authentication and encryption
Encryption key length from 8-bits to 128-bits maximum
Persistent FLASH memory—for BD Address and radio parameter
storage
All ACL (Asynchronous Connection Less) packet types (DM1, DH1,
DM3, DH3, DM5, DH5, 2-DH1, 2-DH3, 2-DH5, 3-DH1 3-DH3, 3-
DH5, AUX1)
SCO (Synchronous Connection Oriented) packet types (HV1, HV2,
HV3)
Point to multipoint and scatternet support—3 master and 7 slave
links allowed (10 active links simultaneously)
Park, sniff, and hold modes—fully supported to maximum allowed
intervals
Master slave switch—supported during connection and post
connection
Dedicated Inquiry Access Code—for improved inquiry scan
performance
Dynamic packet selection—channel quality driven data rate to
optimize link performance
Dynamic power control—interference reduction and link
performance
Bluetooth test modes—per Bluetooth v2.0 specification
802.11b co-existence—AWMA and AFH
Vendor specific HCI commands—to support device configuration
and certification test modes
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-120/121 Datasheet
Page 2 of 6
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Serial Interface AT Commands
The abSerial Interface supports AT style commands, which can be issued from a host PC or controller to control the
BT-121 adaptor. For more information on our AT command set, please refer to the abSerial Reference Guide.
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-120/121 Datasheet
Page 3 of 6
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Hardware
Switches
The following are pin assignments for the switches on the back of the BT-120/121 adapters:
1. Flow Control Pin: ON for no flow control, OFF for CTS/RTS flow control.
2. Not Assigned
3. Programming Pin: ON for normal mode, OFF to run Boot Loader.
4. Not Assigned
Power Jack
Our adapters use a power supply, 5-9 VDC, with a 1.3mm jack.
Connector Types
The BT-120 adapter has a female DB9 serial connector. To connect to a PC, it may use a straight DB9
serial cable M/M.
The BT-121 adapter has a male DB9 serial connector. To connect to a PC, it may use a null modem DB9
serial cable F/F.
LEDs
The following are functional assignments for the LEDs on the BT-120/121 adapters:
LED 1, Not Assigned
LED 2, CPU Active
LED 3, RF Link Active
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-120/121 Datasheet
Page 4 of 6
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-120/121 Datasheet
Page 5 of 6
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