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PDF NRF401 Data sheet ( Hoja de datos )
| Número de pieza | NRF401 | |
| Descripción | 433MHz Single Chip RF Transceiver | |
| Fabricantes | ETC | |
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PRODUCT SPECIFICATION
433MHz Single Chip RF Transceiver nRF401
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
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
Value
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
433.92 / 434.33
FSK
±15
10
-105
20
2.7 – 5.25
250*
Transmit supply current @ -10 dBm output power
Standby supply current
8
8
Table 1. nRF401 quick reference data.
Unit
MHz
kHz
dBm
dBm
kbit/s
V
µA
mA
µA
ORDERING INFORMATION
Type number
Description
nRF401-IC
20 pin SSOIC
nRF401-EVKIT
Evaluation kit with nRF401 IC
Table 2. nRF401 ordering information.
Version
A
1.0
* The PWR_UP pin is used for power duty cycling. The duty-cycle is 2 % with a period of 200msec.
Nordic VLSI ASA
Revision: 1.5
- Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Page 1 of 18
May 2000
1 page  
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
VDD=0 è TX
VDD =0 è RX
Name
tTR
tRT
tST
tSR
tVT
tVR
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
PWR_UP
TXEN
DIN
TX to RX
VDD
PWR_UP
TXEN
DOUT
1ms
02
(a)
4
ms
3ms
02
(b)
4
ms
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 tSR,,
see Table 5. Worst case tSR 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 tST, 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
5 Page 
PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
TXEN
0
0
1
1
X
Input
CS
0
1
0
1
X
PWR_UP
1
1
1
1
0
Response
Channel #
Mode
1 RX
2 RX
1 TX
2 TX
-- Standby
Table 8. Required setting for standby and channel selection in RX and TX.
DIN (data input) and DOUT (data output)
The DIN pin is the input to the digital modulator of the transmitter. The input signal
to this pin should be standard CMOS logic level at data rates up to 20 kbit/s. No
coding of data is required.
DIN = “1” → f = f0 + ∆f
DIN = “0” → f = f0 - ∆f
The demodulated digital output data appear at the DOUT pin at standard CMOS logic
levels.
f0 + ∆f → DOUT=“1”,
f0 - ∆f → DOUT=“0”.
Power up
PWR_UP is a digital input for selection of normal operating mode or standby mode.
PWR_UP = “1” selects normal operating mode.
PWR_UP = “0” selects standby mode.
Frequency difference between transmitter and receiver
For optimum performance, the total frequency difference between transmitter and
receiver should not exceed 70 ppm (30 kHz). This yields a crystal stability
requirement of ±35 ppm for the transmitter and receiver. Frequency difference
exceeding this will result in a -12dB/octave drop in receiver sensitivity. The
functional frequency window of the transmission link is typically 450 ppm (200 kHz).
Example: A crystal with ±20 ppm frequency tolerance and ±25 ppm frequency
stability over the operating temperature has a worst case frequency difference of ±45
ppm. If the transmitter and receiver operate in different temperature environments, the
resulting worst-case frequency difference may be as high as 90 ppm. Resulting drop
in sensitivity due to the extra 20 ppm, is then approx. 5dB.
PCB layout and decoupling guidelines
A well-designed PCB is necessary to achieve good RF performance. A PCB with a
minimum of two layers including a ground plane is recommended for optimum
performance.
The nRF401 DC supply voltage should be decoupled as close as possible to the VDD
pins with high performance RF capacitors, see Table 9. It is preferable to mount a
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 11 of 18
Phone +4772898900 - Fax +4772898989
May 2000
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet NRF401.PDF ] | |
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