iC-MD
RS-422 QUADRATURE
preliminar y
Rev A1, Page 6/23
ENCODER RECEIVER/COUNTER WITH SPI AND BiSS
OPERATING REQUIREMENTS: SPI Interface
Operating Conditions: VDD = 3 . . . 5.5 V, Tj = -40 . . . 125 °C, unless otherwise noted.
Item
No.
Symbol
Parameter
Conditions
Min.
Setup Time:
NCS hi
→
lo before SCK lo
→
hi
Setup Time:
MOSI stable before SCK lo
→
hi
Hold Time:
MOSI stable after SCK lo
→
hi
Signal Duration SCK hi
Signal Duration SCK lo
Hold Time: NCS lo after SCK lo
→
hi
Signal Duration NCS hi
Propagation Delay:
MISO stable after SCK hi
→
lo
Propagation Delay:
MISO high impedance after
NCS lo
→
hi
Clock Frequency
15
20
0
25
25
25
0
40
25
Max.
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
SPI Interface
I001 tsCCL
I002 tsDCL
I003 thDCL
I004 tCLh
I005 tCLI
I006 thCLC
I007 tCSh
I008 tpCLD
I009 tpCSD
I010 f(SCK)
10
MHz
t
CSh
NCS
t
sCCL
SCK
t
CLh
t
sDCL
t
hDCL
t
pCLl
t
hCLC
MOSI
MSB in
tristate
LSB in
MISO
t
CSh
NCS
t
pCLh
t
pCLl
SCK
t
hCLC
MOSI
don’t care
t
pCLD
MISO
MSB out
t
pCLD
LSB out
t
pCSD
Figure 1: SPI write cycle (top) and read cycle (bottom)
ICHAUS [ IC-HAUS GMBH ]
