PRODUCT SPECIFICATION
433MHz Single Chip RF Transceiver
FEATURES
•
•
•
•
•
•
•
•
•
True single chip FSK transceiver
Few external components required
No set up or configuration
No coding of data required
20kbit/s data rate
2 channels
Wide supply range
Very low power consumption
Standby mode
nRF401
APPLICATIONS
•
•
•
•
•
•
•
•
•
Alarm and Security Systems
Automatic Meter Reading (AMR)
Home Automation
Remote Control
Surveillance
Automotive
Telemetry
Toys
Wireless Communication
GENERAL DESCRIPTION
nRF401 is a true single chip UHF transceiver designed to operate in the 433MHz ISM
(Industrial, Scientific and Medical) frequency band. It features Frequency Shift
Keying (FSK) modulation and demodulation capability. nRF401 operates at bit rates
up to 20kbit/s. Transmit power can be adjusted to a maximum of 10dBm. Antenna
interface is differential and suited for low cost PCB antennas. nRF401 features a
standby mode which makes power saving easy and efficient. nRF401 operates from a
single +3-5V DC supply.
As a primary application, nRF401 is intended for UHF radio equipment in compliance
with the European Telecommunication Standard Institute (ETSI) specification
EN 300 220-1 V1.2.1.
QUICK REFERENCE DATA
Parameter
Frequency, Channel#1/Channel#2
Modulation
Frequency deviation
Max. RF output power @ 400Ω, 3V
Sensitivity @ 400Ω, BR=20 kbit/s, BER<10
-3
Maximum bit rate
Supply voltage
Receive supply current
Transmit supply current @ -10 dBm output power
Standby supply current
Value
433.92 / 434.33
FSK
±15
10
-105
20
2.7 – 5.25
250
*
8
8
Unit
MHz
kHz
dBm
dBm
kbit/s
V
µA
mA
µA
Table 1. nRF401 quick reference data.
ORDERING INFORMATION
Type number
nRF401-IC
nRF401-EVKIT
Description
20 pin SSOIC
Evaluation kit with nRF401 IC
Version
A
1.0
Table 2. nRF401 ordering information.
*
The PWR_UP pin is used for power duty cycling. The duty-cycle is 2 % with a period of 200msec.
-
Vestre Rosten 81, N-7075 Tiller, Norway
Page 1 of 18
-
Phone +4772898900
-
Fax +4772898989
May 2000
Nordic VLSI ASA
Revision: 1.5
PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
BLOCK DIAGRAM
DOUT
TXEN
CS
DIN
DEM
LNA
10
19
12
9
16
ANT1
ANT2
15
PWR_UP
18
OSC
PLL
VCO
PA
1
20
4
5
6
11
RF_PWR
VCO
INDUCTOR
REFERENCE
LOOP
FILTER
Figure 1. nRF401 block diagram with external components.
PIN FUNCTIONS
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Name
XC1
VDD
VSS
FILT1
VCO1
VCO2
VSS
VDD
DIN
DOUT
RF_PWR
CS
Pin function
Input
Power
Ground
Input
Input
Input
Ground
Power
Input
Output
Input
Input
Description
Crystal oscillator input
Power supply (+3-5V DC)
Ground (0V)
Loop filter
External inductor for VCO
External inductor for VCO
Ground (0V)
Power supply (+3-5V DC)
Data input
Data output
Transmit power setting
Channel selection
CS=“0”
⇒
433.92MHz (Channel#1)
CS=“1”
⇒
434.33MHz (Channel#2)
Power supply (+3-5V DC)
Ground (0V)
Antenna terminal
Antenna terminal
Ground (0V)
Power on/off
PWR_UP = “1”
⇒
Power up (Operating mode)
PWR_UP = “0”
⇒
Power down (Standby mode)
Transmit enable
TXEN = “1”
⇒
Transmit mode
TXEN = “0”
⇒
Receive mode
Crystal oscillator output
13
14
15
16
17
18
VDD
VSS
ANT2
ANT1
VSS
PWR_UP
Power
Ground
Input/Output
Input/Output
Ground
Input
19
TXEN
Input
20
XC2
Output
Table 3. nRF401 pin functions
.
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 2 of 18
Phone +4772898900
-
Fax +4772898989
May 2000
PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
ELECTRICAL SPECIFICATIONS
Conditions: VDD = +3V DC, VSS = 0V, T
A
= -25°C to +85°C
Symbol
VDD
VSS
I
DD
Parameter (condition)
Min.
Typ.
Max.
Units
P
RF
V
IH
V
IL
V
OH
V
OL
I
H
I
L
f
1
f
2
∆f
f
IF
BW
IF
f
XTAL
Z
I
Supply voltage
2.7
3
5.25
V
Ground
0
V
Total current consumption
Receive mode
11
mA
Transmit mode @ -10 dBm RF power
8
mA
Stand by mode
8
µA
10
dBm
Max. RF output power @ 400Ω load
Logic “1” input voltage
V
DD
V
0.7⋅V
DD
Logic “0” input voltage
0
V
0.3⋅V
DD
Logic “1” output voltage (I
OH
= - 1.0mA)
V
DD
V
0.7⋅V
DD
Logic “0” output voltage (I
OL
= 1.0mA)
0
V
0.3⋅V
DD
Logic “1” input current (V
I
= VDD)
+20
µA
Logic “0” input current (V
I
= VSS)
-20
µA
Channel#1 frequency
433.92
MHz
Channel#2 frequency
434.33
MHz
Dynamic range
90
dB
Modulation type
FSK
Frequency deviation
kHz
±15
IF frequency
400
kHz
IF bandwidth
65
85
kHz
Crystal frequency
4.0
MHz
1)
Crystal frequency stability requirement
ppm
±45
-3
-105
dBm
Sensitivity @ 400Ω,BR=20 kbit/s, BER < 10
Bit rate
0
20
kbit/s
Recommended antenna port differential impedance
400
Ω
Spurious emission
Compliant with EN 300-220-1 V1.2.1
2)
Table 4. nRF401 electrical specifications.
1)
2)
Maximum 5dB sensitivity degradation at temperature extremes. See also page 11.
With a PCB loop antenna or a differential to single ended matching network to a 50Ω antenna.
ABSOLUTE MAXIMUM RATINGS
Supply voltages
VDD .............................. - 0.3V to +6V
VSS ................................................ 0V
Input voltage
V
I
...................... - 0.3V to VDD + 0.3V
Output voltage
V
O
..................... - 0.3V to VDD + 0.3V
Note: Stress exceeding one or more of the limiting values may cause permanent
damage to the device.
ATTENTION!
Electrostatic Sensitive Device
Observe Precaution for handling
Power dissipation
P
D
(T
A
=25°C)........................... 250mW
Temperatures
Operating Temperature…. -25°C to +85°C
Storage Temperature…... -40°C to +125°C
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 3 of 18
Phone +4772898900
-
Fax +4772898989
May 2000
PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
PIN ASSIGNMENT
XC1
VDD
VSS
FILT1
VCO1
VCO2
VSS
VDD
DIN
DOUT
1
2
3
4
5
6
7
8
9
10
20
XC2
19
TXEN
nRF401
20 pin SSOIC
18
PWR_UP
17
VSS
16
ANT1
15
ANT2
14
VSS
13
VDD
12
CS
11
RF_PWR
Figure 2. nRF401 pin assignment.
PACKAGE OUTLINE
nRF401, 20 pin SSOIC. (Dimensions in mm.)
20 19 18
E
H
1 2 3
D
A
1
A
e
b
L
α
Package Type
20 pin SSOIC
(Wide)
Min
Max
D
6.90
7.50
E
5.00
5.60
H
7.40
8.20
A
2.00
A
1
0.05
e
0.65
b
0.22
0.38
L
0.55
0.95
Copl.
0.10
α
0°
8°
Figure 3. SSOIC-20 Package outline.
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 4 of 18
Phone +4772898900
-
Fax +4772898989
May 2000
PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
IMPORTANT TIMING DATA
Timing information
The timing information for the different operations is summarised in Table 5.
(TX is transmit mode, RX is receive mode and Std.by is Standby mode.)
Change of Mode
TX
è
RX
RX
è
TX
Std.byè TX
Std.byè RX
V
DD
=0
è
TX
V
DD
=0
è
RX
Name
t
TR
t
RT
t
ST
t
SR
t
VT
t
VR
Max Delay
3ms
1ms
2ms
3ms
4ms
5ms
Condition
Operational
mode
Start-up
Table 5 Switching times for nRF401.
Switching TX
↔
RX (operational mode).
When switching from RX-mode to TX-mode data (DIN) may not be sent before the
TXEN-input has been high for at least 1ms, see Figure 4(a).
When switching from TX-mode to RX-mode the receiver may not receive data
(DOUT) before the TXEN-input has been low for at least 3ms, see Figure 4(b).
RX to TX
VDD
VDD
TX to RX
PWR_UP
PWR_UP
TXEN
TXEN
DIN
DOUT
1ms
ms
0
2
4
0
3ms
ms
2
4
(a)
(b)
Figure 4. Timing diagram for nRF401for switching from RX to TX (a)
and TX to RX (b).
Switching between standby and RX-mode (operational mode).
The time from the PWR_UP input is set to “1”, until the data (DOUT) is valid is t
SR,
,
see Table 5. Worst case t
SR
is 3ms for nRF401 as can be seen in Figure 5 (a).
Switching between standby and TX-mode (operational mode).
The time from the PWR_UP input is set to “1”, until the synthesised frequency is
stable is t
ST
, see Table 5.
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 5 of 18
Phone +4772898900
-
Fax +4772898989
May 2000
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