CMA3000-D0X Datasheet, PDF (21/35 Pages) VTI technologies – 3-axis accelerometer

CMA3000-D0X Series
5.3.3 SPI AC characteristics
The AC characteristics of the CMA3000 SPI interface are defined in Figure 11 and in Table 10.
T_LS1
T_CH
T_CL
T_LS2
T_LH
CSB
SCK
THOL
T_SET
MOSI
MSB in
DATA in
LSB in
T_VAL1
T_VAL2
T_LZ
MISO
MSB out
DATA out
LSB out
Figure 11. Timing diagram for SPI communication.
Table 10. AC characteristics of SPI communication.
No. Parameter
Terminal CSB, SCK
1
Time from CSB (10%) to
SCK (90%) ⁽¹
2
Time from SCK (10%) to
CSB (90%) ⁽¹
Terminal SCK
3 SCK low time
4 SCK high time
5 SCK Frequency
Conditions
Load capacitance
at MISO < 50 pF
Load capacitance
at MISO < 50 pF
Terminal MOSI, SCK
6 Time from changing MOSI
(10%, 90%) to SCK (90%)
Data setup time
7 Time from SCK (90%) to
changing MOSI (10%, 90%)
Data hold time
Terminal MISO, CSB
8 Time from CSB (10%) to
stable MISO (10%, 90%)
9 Time from CSB (90%) to
high impedance state of
MISO ⁽¹.
Terminal MISO, SCK
10 Time from SCK (10%) to
stable MISO (10%, 90%) ⁽¹.
Terminal MOSI, CSB
11 Time between SPI cycles,
CSB at high level (90%)
1) _{Tper is SCK period}
Load capacitance
at MISO < 50 pF
Load capacitance
at MISO < 50 pF
Load capacitance
at MISO < 50 pF
Symbol
T_LS1
T_LS2
T_CL
T_CH
fsck =
1/T_per
T_SET
Min
Typ
0.80*
T_per/2
0.80*
T_per/2
0.80*
T_per/2
0.80*
T_per/2
T_per/2
T_per/2
T_per/4
T_HOL
T_per/4
T_VAL1
T_LZ
T_VAL2
T_LH
11 * T_per
Max
Unit
ns
ns
ns
ns
0.5
MHz
ns
ns
T_per/4
ns
T_per/4
ns
1.5*T_per/4
ns
ns
5.3.4
I²C AC characteristics
Please, see Phillips Semiconductors, The I²C bus specification, Version 2.1, January 2000, pp. 31-
33.
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