4.0 Ordering Information ...................................................................................................................................................................18
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DS50002328A-page 2
2015 Microchip Technology Inc.
RN42/RN42N
1.0
DEVICE OVERVIEW
FIGURE 1-1:
The RN42/RN42N module is a small form factor, low-
power, class 2 Bluetooth radio that is ideal for
designers who want to add wireless capability to their
products without spending significant time and money
developing Bluetooth-specific hardware and software.
The RN42/RN42N supports multiple interface
protocols, is simple to design in, and is fully certified,
making it a complete embedded Bluetooth solution.
With its high-performance, PCB trace antenna (RN42)
or external antenna (RN42N), and support for
Bluetooth EDR, the RN42/RN42N delivers up to a 3-
Mbps data rate for distances up to 10 meters.
RN42/RN42N TO MCU
INTERFACE
1.1
MCU Interface
The RN42/RN42N module is managed through ASCII
commands via the UART and/or PIO signals. A micro-
controller unit (MCU) or host processor sends com-
mands to configure module features, read status, and
manage Bluetooth data connections.
As shown in
Figure 1-1,
the UART TX and RX are
required to communicate with module, and transfer
data across Bluetooth SPP connection.
Connecting the hardware flow control lines CTS and
RTS is highly recommended for applications that
transmits a continuous stream of data.
The module can be configured locally via the UART or
over-the-air. To support instant cable replacement,
auto-discovery/pairing does not require software con-
figuration. Additionally, the module supports auto-con-
nect master, I/O pin (DTR), and character-based trigger
modes.
Table 1-1, Table 1-2, Table 1-3, Table 1-4,
and
Table 1-
5
provide the module’s environmental conditions, elec-
trical characteristics, dimensions, radio characteristics,
and digital I/O characteristics.
1.2
ASCII Command and Data
Interface
The “Bluetooth
Data Module Advanced User’s Guide”
provides a complete description of the ASCII command
and data interface for the RN42/RN42N module.
TABLE 1-1:
ENVIRONMENTAL CONDITIONS
Parameter
Value
-40
o
C ~ 85
o
C
-40
o
C ~ 85
o
C
90%
90%
1
Temperature Range (Operating)
Temperature Range (Storage)
Relative Humidity (Operating)
Relative Humidity (Storage)
Moisture Sensitivity Level
TABLE 1-2:
ELECTRICAL CHARACTERISTICS
Parameter
Min.
3.0
—
—
—
40
—
Typ.
3.3
40
25
12
45
26
Max.
3.6
—
—
—
50
—
Units
V
mA
mA
mA
mA
A
Supply Voltage (DC)
Average Power Consumption
Radio On (Discovery or Inquiry Window Time)
(1)
Connected Idle (No Sniff)
Connected Idle (Sniff 100 ms)
Connected with Data Transfer
Deep Sleep Idle Mode
Note 1:
This characteristic applies if, in Slave mode, there are bursts of radio on time that vary with the windows. The window setting
determines the average current.
2015 Microchip Technology Inc.
DS50002328A-page 3
RN42/RN42N
TABLE 1-3:
Size
Weight
MODULE DIMENSIONS
RN42
13.4 x 25.8 x 2.4
0.045
0.040
Parameter
RN42N
13.4 x 20.5 x 2.4
Units
mm
oz.
TABLE 1-4:
RADIO CHARACTERISTICS
Parameter
Frequency
(GHz)
2.402
2.441
2.480
Min.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
140
140
140
140
140
140
Typ.
-80
-80
-80
4
4
4
4
4
4
5
5
5
900
15
13
165
165
165
190
190
190
Max.
-86
-86
-86
—
—
—
—
—
—
75
75
75
1000
—
—
175
175
175
—
—
—
115
≤
1000
40
20
> 140
75
Bluetooth
Specification
≤
-70
Units
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
Sensitivity at 0.1% BER
RF Transmit Power
RN42
(1)
2.402
2.441
2.480
2.402
2.441
2.480
2.402
2.441
2.480
RF Transmit Power
(1)
RN42N
Initial Carrier Frequency Tolerance
20-dB Bandwidth for Modulated Carrier
Drift (Five Slots Packet)
Drift Rate
∆f1
avg
Maximum Modulation
—
—
—
2.402
2.441
2.480
∆f2
avg
Minimum Modulation
2.402
2.441
2.480
Note 1:
Normal mode
TABLE 1-5:
DIGITAL I/O CHARACTERISTICS
3.0 V
≤
VDD
≤
3.3 V
Min.
-0.4
0.7 VDD
—
VDD - 0.2
+0.2
Typ.
—
—
—
—
+1.0
Max.
+0.8
VDD + 0.4
0.2
—
+5.0
Units
V
V
V
V
A
Input Logic Level Low
Input Logic Level High
Output Logic Level Low
Output Logic Level High
All I/O pins (Except reset) Default to Weak Pull Down
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