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PDF RFD21737 Data sheet ( Hoja de datos )
| Número de pieza | RFD21737 | |
| Descripción | 2.4GHz RF Modules | |
| Fabricantes | RF Digital | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RFD21737 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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13715 Alton Pkwy • Irvine • CA • 92618
Tel: 949.610.0008 • Fax: 949.610.0009
www.rfdigital.com • [email protected]
RF.Digital.nRF24LE1.Module.Manual.doc
2.4GHz RF Modules (based on nRF24LE1)
RFD21731, RFD21732, RFD21733, RFD21734, RFD21735,
RFD21736, RFD21737, RFD21738
Preliminary Datasheet
12/29/2008 1:17 PM
This document is being updated on a daily basis, always check for updates.
Features
• Complete radio transceiver in a single package
o Nordic Semiconductor nRF24LE1-F16Q24 microcontroller and 2.4GHz radio
o Chip antenna (RFD21731, RFD21732, RFD21733)
o External antenna (RFD21734, RFD21735)
o Matching network
o Voltage regulation
o RF shielding (suitable for FCC, IC and CE compliance)
o Includes 32KHz crystal for real-time clock (RFD21732, RFD21734)
• No RF knowledge required
• No RF layout required
• No external RF components required
• Single 1.9V to 3.3V supply
• Small size: 15 x 15 x 3mm
• Tape and Reeled packaging
• Easy to lay out 19-land SMT package with 0.050 inch (1.27mm) pitch.
• Typical range: 300 ft outdoors, 75 ft indoors
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1 page  
13715 Alton Pkwy • Irvine • CA • 92618
Tel: 949.610.0008 • Fax: 949.610.0009
www.rfdigital.com • [email protected]
Pin Configuration
Pin Descriptions
Signal
VDD
GND
P0.6
P0.5
P0.4
P0.3
P0.2
P0.1
P0.0
PROG
/RESET
Pin
13
9, 10, 12, 18, 19
7
6
5
4
3
17
16
15
14
EXT_ANT 11
N/C 1, 2, 8
Description
Digital supply voltage
Ground – connect all ground signals together
General purpose I/O pin
General purpose I/O pin
General purpose I/O pin
General purpose I/O pin
General purpose I/O pin
General purpose I/O pin
General purpose I/O pin
Connect an external 10KΩ pull-down resistor.
Reset signal, active low. Connect an external 10KΩ pull-up
resistor.
Connection for an external antenna on certain hardware
models, N/C otherwise
Do Not Connect
5
5 Page 
13715 Alton Pkwy • Irvine • CA • 92618
Tel: 949.610.0008 • Fax: 949.610.0009
www.rfdigital.com • [email protected]
Bi-Directional IO Signal Operation
UART mode includes an additional bi-directional general-purpose IO line. The IO signal is
generally an input, and should be pulled to GND with an appropriately sized resistor. If the IO
signal is driven high, the module will transmit this information, and any UART which receives
the data will turn its IO signal into an output and drive it high. This will continue until 20ms
pass without receiving any new data, or until the module receives a packet which indicates that
the IO signal should be driven low and turned back to an input. The state of the IO signal does
not require any extra data in the radio stream, and so is “free” in the packet overhead.
When the module is driving its IO signal high, it will periodically change the pin to an input and
check to see if it remains high, before changing it back to an output. This may cause a
momentary dip in the signal (less than 1ms every 12ms), and so any circuitry which relies on a
steady-state output from the IO signal should include conditioning (for example a retriggerable
one-shot with a hold time of 2ms) to avoid adverse effects.
ESN Read-back
In certain applications, it is helpful to know the ESN of a module. There is a provision in both
UART modes to read back the ESN when the module comes out of reset. ESN read-back is
not available in any of the other modes.
To activate ESN read-back:
1. Place the module in a reset state by holding the /RESET signal low.
2. Hold the LEARN signal high.
3. Release the /RESET signal.
4. Wait 250ms. If the LEARN signal goes low at any time during this 250ms interval, the
module immediately exits ESN read-back mode.
5. Release the LEARN signal.
6. Send the string “READ ESN” (all capitals, one space between the two words) at 9600-
8N1 into the module on the TX_in signal (P0.6). If this string is not received within 1
second, the module exits ESN read-back mode.
The module will respond with the ESN and a firmware identifier on the RX_out signal (P0.5) at
9600-8N1, and then exit ESN read-back mode. An example of the output is:
314CE686:RFDP8 v1.2 11/18/08 08:45:16$
The ESN is 8 characters, representing a 32-bit number in hexadecimal format. A colon
separates the ESN from the Firmware ID. The Firmware ID is 32 bytes long. The output is
terminated with a carriage return/line feed pair.
When the module exits ESN read-back mode, or if the LEARN signal is not high when the
module exists reset, the module will enter regular operation in Mode 2 or 3, according to the
mode select signals.
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RFD21737.PDF ] | |
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