Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Product Specification
Features
15mm x 27mm
Description
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One of the most capable Bluetooth modules available, the BT-21 Bluetooth
OEM Module is designed for maximum flexibility. The BT-21 module
includes 14 general purpose input/output lines, several serial interface
options, analog-to-digital inputs, and up to 2M bps data throughput.
The BT-21 is a surface mount PCB module 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.
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Customized firmware for peripheral device interaction, power optimization,
security, and other proprietary features may be supported and can be
ordered pre-loaded and configured.
Additional Documentation
BT Hardware Design Guide
abSerial User Guide
abSerial Reference Guide
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
ST Micro ARM7 microprocessor up to 50MHz
Memory
256K bytes flash memory
64K bytes RAM memory
Data Rate
2M bps maximum data rate
Multipoint capability
Serial Interface
UART, up to 480K baud (up to 3.25M baud on BT21.2)
Buffered SPI interface
I2C interface
USB v2.0
General I/O
14 general purpose I/O
4x12-bit A/D inputs
User Interface
AT command set
©2008 Amp’ed RF Inc
1
9/29/08
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-21 Datasheet
Page 1 of 12
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
EVENTS
COMMANDS
ARM7
CPU
HCI
LM
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
FLASH
MEMORY
©2008 Amp’ed RF Inc
2
9/29/08
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-21 Datasheet
Page 2 of 12
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Hardware Specifications
General Conditions (V
IN
= 3.0V and 25°C)
Recommended Operating Conditions
Typical
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3.0
3.0
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2483.5
MHz
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Volts
3.4
Volts
Max
80
Unit
°C
Rating
Operating Temperature Range
Min
-20
Supply Voltage V
IN
2.8
Signal Pin Voltage
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RF Frequency
2400
Absolute Maximum Ratings
Typical
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-5
dBm
+ 4.0
Volts
+ 3.6
Volts
Max
+150
Unit
°C
Rating
Storage temperature range
Min
-55
Supply voltage, V
IN
-0.3
I/O pin voltage, V
IO
-0.3
RF input power
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Current Consumption
Avg
35.0
35.0
16.0
24.0
8.0
8.4
2.0
2.5
14.0
0.11
1.4
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
Unit
Modes
Typical Power Consumption
ACL data 115K Baud UART at max throughput (Master)
ACL data 115K Baud UART at max throughput (Slave)
Connection, no data traffic, master
Connection, no data traffic, slave
Connection in sniff (Tsniff=100ms), no data traffic, master
Connection in sniff (Tsniff=100ms), no data traffic, slave
Connection in sniff (Tsniff=375ms), no data traffic, master
Connection in sniff (Tsniff=375ms), no data traffic, slave
Standby, without deep sleep
Standby, with deep sleep
Page/Inquiry scan, deep sleep
©2008 Amp’ed RF Inc
3
9/29/08
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-21 Datasheet
Page 3 of 12
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
I/O Operating Characteristics
Symbol
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2.1
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2.2
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80
80
120
KΩ
Resistor Turned On
120
KΩ
Resistor Turned On
4.0
mA
V
OH
= 2.2 V
4.0
mA
V
OL
= 0.4 V
-
Volts
V
IN
, 3.0V
0.4
Volts
V
IN
, 3.0V
-
Volts
V
IN
, 3.0V
0.9
Volts
V
IN
, 3.0V
Parameter
Min
Max
Unit
Conditions
V
IL
Low-Level Input Voltage
V
IH
High-Level Input Voltage
V
OL
Low-Level Output Voltage
V
OH
High-Level Output Voltage
I
OL
Low -Level Output Current
I
OH
High-Level Output Current
R
PU
Pull-up Resistor
R
PD
Pull-down Resistor
Selected RF Characteristics
Parameters
50
≤
-70
≥
-20
2.5:1
-6 to +4
± 75
≤
1000
932
0
+5
dBm
kHz
kHz
-9
dBm
-84
dBm
ohm
Conditions
BT Spec
Typical
Unit
Antenna load
Radio Receiver
Sensitivity level
BER < .001 with DH5
Maximum usable level
BER < .001 with DH1
Input VSWR
Radio Transmitter
Maximum output power
50
Ω
load
Initial Carrier Frequency Tolerance
20 dB Bandwidth for modulated carrier
©2008 Amp’ed RF Inc
4
9/29/08
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-21 Datasheet
Page 4 of 12
Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Pin Assignment
Description
Receive data
Transmit data
ALT Function
Name
Type
UART Interface
Pin #
RXD
I
8
TXD
O
6
CTS
I
9
Clear to send (active low)
RTS
O
10
Request to send (active low)
Reserved – Available on BT21.2
Boot 0
I
2
Boot Loader (active high)
GPIO [11]
I/O
11
General Purpose Input/Output
GPIO [12]
V
DD
GND
I/O
12
General Purpose Input/Output
Power and Ground
V
DD
24
GND
23
Reset
RESETN
SPI MISO
SPI MOSI
SPI SS
SPI CLK
UART 2 RXD
UART 2 TXD
ADC 0
ADC 1
ADC 2
ADC 3
I
3
Reset input (active low for 5 ms);
GPIO – General Purpose Input/Output
GPIO [0]
I/O
16
General Purpose Input/Output
GPIO [1]
I/O
17
General Purpose Input/Output
GPIO [2]
I/O
19
General Purpose Input/Output
GPIO [3]
I/O
1
General Purpose Input/Output
GPIO [4]
I/O
18
General Purpose Input/Output
GPIO [5]
I/O
20
General Purpose Input/Output
GPIO [6]
I/O
22
General Purpose Input/Output
GPIO [7]
I/O
13
General Purpose Input/Output
GPIO [8]
I/O
4
General Purpose Input/Output
GPIO [9]
I/O
7
General Purpose Input/Output
GPIO [10]
I/O
5
General Purpose Input/Output
GPIO [13]
I/O
15
General Purpose Input/Output
GPIO [14]
I/O
14
General Purpose Input/Output
GPIO [15]
I/O
21
General Purpose Input/Output
©2008 Amp’ed RF Inc
5
9/29/08
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
www.ampedrf.com
BT-21 Datasheet
Page 5 of 12
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