NRF905 NORDIC SEMICONDUCTOR, NRF905 Datasheet - Page 22

• Manufacturer Part Number: NRF905
• Description: IC, TRANSCEIVER, 430 928MHZ, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF905

• Transmitting Current: 9mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Sensitivity Dbm: -100dBm
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To 3.6V
• Output Power: 10dBm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF905 Single Chip 433/868/915 MHz Radio Transceiver
7.3
After the Data Ready (DR) has been set high a valid data packet is available in the RX
data register. This may be clocked out in RX mode or standby mode. After the data
has been clocked out via the SPI interface the Data Ready (DR) and Address Match
(AM) pins are reset to low.
The RX register is reset if the PWR_UP pin is taken low or if the device is switched
into TX mode i.e. TXEN is taken high. This will also results in the Data Ready(DR)
and Address Match (AM) pins being reset to low.
7.4
In each data-packet transmitted by the nRF905 a preamble is added automatically.
The preamble is a predefined bit-sequence used to adjust the receiver for optimal
performance. A ten-bit sequence is used as preamble in nRF905. The length of the
preamble, t
Main office: Nordic Semiconductor ASA
Revision: 1.4
P W R _ U P
T R X _ C E
R X D A T A
T X _ E N
T I M E
C D
A M
D R
ShockBurstTM RX timing
Preamble
preamble
6 5 0 u S t o e n t e r R X
m o d e f r o m
T R X _ C E b e i n g s e t
h ig h .
Figure 10 Timing diagram for standby to receiving.
, is then 200 s.
6 5 0 u S
T 0
- Vestre Rosten 81, N-7075 Tiller, Norway
T 0 = R e c e i v e r E n a b le d - L is t e n in g f o r D a t a
T 1 = C a r r ie r D e t e c t f i n d s a c a r r i e r
T 2 = A M - C o r r e c t A d d r e s s F o u n d
T 3 = D R - D a t a p a c k e t w i t h c o r r e c t A d d r e s s / C R C
Page 22 of 42
T 1
T 2
- Phone [phone] -Fax [phone]
T 3
June 2006