Texas Instruments CC3235MODSF SimpleLink, Руководство пользователя

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T2 T6
T5
T9
T3 T8 T7 T4 T1
I2CSCL
I2CSDA
57
CC3235MODS, CC3235MODSF
www.ti.com SWRS224A – FEBRUARY 2019 – REVISED AUGUST 2019
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Specifications
Copyright © 2019, Texas Instruments Incorporated
5.18.5.3.1 GPIO Input Transition Time Parameters
Table 5-19 lists the input transition time parameters.
Table 5-19. GPIO Input Transition Time Parameters
MIN MAX UNIT
t
r
Input transition time (t
r
, t
f
), 10% to 90%
1 3 ns
t
f
1 3 ns
(1) All timing is with 6-mA drive and 20-pF load.
(2) This value depends on the value programmed in the clock period register of I
2
C. Maximum output frequency is the result of the minimal
value programmed in this register.
(3) Because I
2
C is an open-drain interface, the controller can drive logic 0 only. Logic is the result of external pullup. Rise time depends on
the value of the external signal capacitance and external pullup register.
5.18.5.4 I
2
C
The CC3235MODx MCU includes one I2C module operating with standard (100 kbps) or fast (400 kbps)
transmission speeds.
Figure 5-13 shows the I
2
C timing diagram.
Figure 5-13. I
2
C Timing Diagram
Table 5-20 lists the I
2
C timing parameters.
Table 5-20. I
2
C Timing Parameters
(1)
ITEM NAME DESCRIPTION MIN MAX UNIT
T2 t
LP
Clock low period See
(2)
System clock
T3 t
SRT
SCL/SDA rise time See
(3)
ns
T4 t
DH
Data hold time NA
T5 t
SFT
SCL/SDA fall time 3 ns
T6 t
HT
Clock high time See
(2)
System clock
T7 t
DS
Data setup time tLP/2 System clock
T8 t
SCSR
Start condition setup time 36 System clock
T9 t
SCS
Stop condition setup time 24 System clock