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PRELIMINARY
CY22701
Document #: 38-07698 Rev. *B
Page 10 of 15
Serial Programming Interface Timing
Figure 6. Start and Stop Frame
Figure 7. Frame Format (Device Address, R/W, Register Address, Register Data)
SDAT
SCLK
START
Transition
to next Bit
STOP
SDAT
SCLK
DA6
DA5 DA0
R/W
ACK
RA7
RA6 RA1
RA0
ACK
STOP
START
ACK
D7
D6
D1
D0
++
+
+
+
+
Table 14.Recommended Pullable Crystal Specifications
Parameter
Description
Comments
Min.
Typ.
Max.
Units
CLNOM
Nominal load capacitance
–
14
–
pF
R1
Equivalent series resistance (ESR)
Fundamental mode
–
–
25
Ω
R3/R1
Ratio of third overtone mode ESR to
fundamental mode ESR
Ratio used because typical R1 values
are much less than the maximum spec
3–
–
DL
Crystal drive level
No external series resistor assumed
–
0.5
2
mW
F3SEPHI
Third overtone separation from 3*FNOM High side
400
–
–
ppm
F3SEPLO
Third overtone separation from 3*FNOM Low side
–
–
–200
ppm
C0
Crystal shunt capacitance
–
–
7
pF
C0/C1
Ratio of shunt to motional capacitance
180
–
250
C1
Crystal motional capacitance
14.4
18
21.6
fF