NRF905 NORDIC SEMICONDUCTOR, NRF905 Datasheet - Page 21

• 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 IMPORTANT TIMING DATA
The following timing must be obeyed during nRF905 operation.
7.1
Notes to table:
7.2
After a data packet has finished transmitting the device will automatically enter
Standby mode and wait for the next pulse of TRX_CE. If the Auto Re-Transmit
function is enabled the data packet will continue re-sending the same data packet until
TRX_CE is set low.
Main office: Nordic Semiconductor ASA
Revision: 1.4
P W R _ U P
T R X _ C E
T X D A T A
T X _ E N
M O S I
T IM E
C S N
Device Switching Times
ShockBurst
1)
C o n fig u r a tio n R e g is te r
a n d T X D a ta R e g is t e r
RX to TX or TX to RX switching is available without re-programming of the RF
configuration register. The same frequency channel is maintained.
PWR_DWN
STBY
STBY
RX ShockBurst™
TX ShockBurst™
P r o g r a m m in g o f
TM
Figure 9 Timing diagram for standby to transmit.
TX timing
Table 11 Switching times for nRF905.
TX ShockBurst™
RX ShockBurst™
T 0 = R a d io E n a b le d
T 1 = T 0 + 1 0 u S M in im u m T R X _ C E p u ls e
T 2 = T 0 + 6 5 0 u S . S t a r t o f T X D a ta t r a n s m is s io n
T 3 = E n d o f D a ta P a c k e t , e n te r S t a n d b y m o d e
ST_BY mode
- Vestre Rosten 81, N-7075 Tiller, Norway
nRF905 timing
RX ShockBurst™
TX ShockBurst™
T 0
Page 21 of 42
T 1
T 2
T r a n s m itte d D a ta 1 0 0 k b p s
M a n c h e s te r E n c o d e d
- Phone [phone] -Fax [phone]
550
550
650 s
650 s
Max.
3 ms
1
1
s
s
T 3
June 2006