CY8C21334_13 Datasheet, PDF (22/38 Pages) Cypress Semiconductor – Automotive – Extended Temperature PSoC® Programmable System-on-Chip™

CY8C21334, CY8C21534
AC I²C Specifications
Table 21 lists guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75 V to 5.25 V and
–40 °C  T_A  125 °C. Typical parameters apply to 5 V at 25 °C and are for design guidance only.
Table 21. AC Characteristics of the I²C SDA and SCL Pins
Symbol
F_SCLI2C
t_HDSTAI2C
t_LOWI2C
t_HIGHI2C
t_SUSTAI2C
t_HDDATI2C
t_SUDATI2C
t_SUSTOI2C
t_BUFI2C
t_SPI2C
Description
SCL clock frequency
Standard Mode
Min Max
0
100^[18]
Fast Mode
Min Max
0
400^[18]
Hold time (repeated) START condition. After 4.0
–
0.6
–
this period, the first clock pulse is generated.
LOW period of the SCL clock
4.7
–
1.3
–
HIGH period of the SCL clock
4.0
–
0.6
–
Setup time for a repeated START condition 4.7
–
0.6
–
Data hold time
Data setup time
0
–
0
–
250
–
100^[19]
–
Setup time for STOP condition
4.0
–
0.6
–
Bus free time between a STOP and START 4.7
–
1.3
–
condition
Pulse width of spikes are suppressed by the –
–
0
50
input filter.
Units
kHz
s
s
s
s
s
ns
s
s
ns
Notes
Figure 8. Definition for Timing for Fast/Standard Mode on the I²C Bus
I2C_SDA
I2C_SCL
t_SUDATI2C
t_HDSTAI2C
t_HDDATI2C ^tSUSTAI2C
t_SPI2C
t_BUFI2C
t_HIGHI2C t_LOWI2C
S
START Condition
Sr
Repeated START Condition
t_SUSTOI2C
P
S
STOP Condition
Notes
18. F_SCLI2C is derived from SysClk of the PSoC. This specification assumes that SysClk is operating at 24 MHz, nominal. If SysClk is at a lower frequency, then the
19.
FA_{SFCaLsI2tC-MsopdeeciIf2}icCa-tbiouns
adjusts
device
accordingly
can be used
in
a
Standard-Mode
I²C-bus
system,
but
the
requirement
t_SUDATI2C

250
ns
must
then
be
met.
This
is
automatically
the
case if the device does not stretch the LOW period of the SCL signal. If such device does stretch the LOW period of the SCL signal, it must output the next data bit
to the SDA line t_rmax + t_SUDATI2C = 1000 + 250 = 1250 ns (according to the Standard-Mode I²C-bus specification) before the SCL line is released.
Document Number:38-12038 Rev. *J
Page 22 of 38