nRF24E2 Nordic VLSI, nRF24E2 Datasheet - Page 17

• Manufacturer Part Number: nRF24E2
• Description: Single Chip RF Transmitter + MCU + ADC NRF2402 2.4GHz RF Transmitter
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
Figure 3-1 : SPI interface timing
Minimum time between two consecutive SPI transactions will be :
where t
write to SPI_DATA register.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
SPI_DATA
SW
t
t
t
t
t
t
Note that the above delay, setup and hold time numbers only apply for SPI
connected to Port 1; as when SPI is connected to the Radio, SCK,SDO,SDI are
all internal signals, not visible to the user.
8.5 t
SPI_READY
cSCK
dSCK
dSDO
sSDI
hSDI
dready
register
write to
End of
interrupt
SDO
SCK
SDI
is the time taken by the software to process SPI_READY interrupt, and
cSCK
: SDI setup time to posedge SCK, t
: SDI hold time to posedge SCK, t
: SCK cycle time, as defined by SPICLK register.
: time from writing to SPI_DATA register to first SCK pulse,
: delay from negedge SCK to new SDO output data, may vary from
: time from last SCK pulse to SPI_READY interrupt goes active
t
-40ns to 40ns
t
dSCK
dready
+ t
t
dSCK
dready
= t
MSB
MSB
= 7 CPU clock cycles
cSCK
+ t
t
dSDO
SW
/ 2
t
sSDI
Qhtrà &ÂsÃ(
t
hSDI
sSDI
hSDI
t
cSCK
> 45ns.
> 0ns.
August 2003
LSB
LSB
t
dready