BT121 BLUETOOTH SMART READY MODULE
DATA SHEET
Monday, 14 September 2015
Document Version: 1.44
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SIG, Inc. USA.
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Bluegiga – A Silicon Labs Company
VERSION HISTORY
Date Edited
1.0
1.1
1.2
1.3
1.4
1.41
Comment
First release of document
Minor updates
Minor updates
Power consumption measurements
Revised power consumption measurements
FCC, IC, Japan and Korea certification info updated
Various corrections and edits, corrected front page +10dBm LE power
number and RF specification +9dBm both to the +7dBm setting used in the
module for regulatory compliance
Wake-up pin section added
Mass production part numbers added to ordering code list.
1.42
1.43
1.44
Bluegiga – A Silicon Labs Company
TABLE OF CONTENTS
BT121 overview
1.1
1.2
1.3
Key Features
Typical applications
Block diagram
6
6
7
7
Design guidelines
2.1
2.2
2.3
2.4
PCB layout recommendations
Power supply recommendations
Software application related options
Firmware updating related recommendations
8
8
8
8
8
Pin-out description
3.1
3.2
Power, ground, reset, RF and boot loader pins
GPIO pins
10
10
11
Power control
4.1
4.2
4.3
4.4
4.5
Power supply requirements
Power saving functionality
Reset
Recovery mode
Clock signals
12
12
12
13
14
14
Interfaces
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
GPIO
UART
I
2
C
SPI
ADC
DAC
Real-time clock
Microcontroller programming interface
15
15
16
16
16
16
16
16
16
Antenna
6.1
6.2
6.3
6.4
6.5
6.6
Effect on antenna matching of a plastic sheet placed near the antenna
Effect on antenna matching of a metal sheet placed under the antenna
Effect on antenna matching of a metal sheet placed against the end of the module
Measured antenna efficiency
Measured 2D radiation patterns
Measured 3D radiation patterns
17
18
19
20
21
22
24
Bluetooth Stack Software
Host interface
Bluegiga – A Silicon Labs Company
25
26
4
8.1
UART
26
Connection examples
9.1
9.2
9.3
Connecting an external host using the UART interface
Connecting an external device using SPI interface
Connecting an external device using I
2
C interface
27
27
28
29
Electrical characteristics
10.1
10.2
10.3
10.4
Absolute maximum ratings
Recommended operating conditions
Logic signal characteristics
Power consumption
30
30
30
31
33
RF Characteristics
11.1
11.2
11.3
11.4
Supported frequencies and channels
Typical receiver sensitivity
Transmitter output power
Carrier frequency accuracy
35
35
35
35
35
Physical dimensions
Soldering recommendations
13.1
Soldering profile example
36
38
39
Tape and reel packaging
14.1
14.2
14.3
14.4
Reel material and dimensions
Tape material and dimensions
Tape and reel box dimensions
Module orientation in tape
40
40
40
41
41
Certifications
15.1
15.2
15.3
15.4
15.5
CE
FCC
IC
MIC Japan
KC (South-Korea)
42
42
42
43
45
45
Ordering information
Contact Information
46
47
Bluegiga – A Silicon Labs Company
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