Datasheet

Page 26 of 161
nRF8001 Product Specification
Revision 1.2
Figure 13. nRF8001 initiated packet SPI timing
Table 4. SPI timing parameters
Note:
C
LOAD
= 25 pF, input transition to REQN, SCK and MOSI is in the range 5-15 ns. Rise and fall
times are defined as the time when the signal is between 10-90 % of VDD.
Symbol Description Notes Min Max Unit
T
dc
Data to SCK setup 15 ns
T
dh
SCK to Data Hold 5 ns
T
csd
REQN/RDYN to Data Valid 100 ns
T
cd
SCK to Data Valid 12 100 ns
T
cl
SCK Low time 40 ns
T
ch
SCK High time 40 20000 ns
T
rr
nRF8001 response time from REQN to RDYN
1
1. The maximum response timing will be controlled by the radio event. If the REQN is acti-
vated at the start of a radio event, the RDYN response will be delayed until after the
radio event is finished (plus typical response time).
40 ns
T
rr_high
Time taken for the RDYN line to follow the REQN
line, when the
REQN line is pulled high
100 ns
F
sck
SCK frequency 0 3 MHz
T
r
, T
f
REQN, SCK and MOSI rise time/fall time 15 ns
T
cc
REQN/RDYN to SCK setup 20 ns
T
cch
SCK to REQN hold 10 ns
T
cwh
REQN inactive time 250 ns
T
cdz
REQN to output high- Z 100 ns
T
cc
T
ch
T
cl
T
cch
T
cwh
T
csd
T
dc
T
cd
T
cdz
˜˜˜˜˜˜
RDYN
T
dh
MOSI
MISO
SCK
REQN
˜
T
rr_high