Datasheet

PIC24F16KL402 FAMILY
DS30001037C-page 222  2011-2013 Microchip Technology Inc.
FIGURE 26-14: MSSPx I
2
C™ BUS DATA TIMING
TABLE 26-34: I
2
C™ BUS DATA REQUIREMENTS (MASTER MODE)
Param.
No.
Symbol Characteristic Min Max Units Conditions
100 T
HIGH Clock High Time 100 kHz mode 2(TOSC)(BRG + 1) — —
400 kHz mode 2(T
OSC)(BRG + 1) — —
101 TLOW Clock Low Time 100 kHz mode 2(TOSC)(BRG + 1) — —
400 kHz mode 2(TOSC)(BRG + 1) — —
102 T
R SDAx and SCLx
Rise Time
100 kHz mode — 1000 ns CB is specified to be from
10 to 400 pF
400 kHz mode 20 + 0.1 CB 300 ns
103 TF SDAx and SCLx
Fall Time
100 kHz mode — 300 ns CB is specified to be from
10 to 400 pF
400 kHz mode 20 + 0.1 C
B 300 ns
90 TSU:STA Start Condition
Setup Time
100 kHz mode 2(TOSC)(BRG + 1) — — Only relevant for Repeated
Start condition
400 kHz mode 2(TOSC)(BRG + 1) — —
91 T
HD:STA Start Condition
Hold Time
100 kHz mode 2(TOSC)(BRG + 1) — — After this period, the first
clock pulse is generated
400 kHz mode 2(TOSC)(BRG + 1) — —
106 THD:DAT Data Input
Hold Time
100 kHz mode 0 — ns
400 kHz mode 0 0.9 s
107 T
SU:DAT Data Input
Setup Time
100 kHz mode 250 — ns (Note 1)
400 kHz mode 100 — ns
92 T
SU:STO Stop Condition
Setup Time
100 kHz mode 2(TOSC)(BRG + 1) — —
400 kHz mode 2(T
OSC)(BRG + 1) — —
109 T
AA Output Valid
from Clock
100 kHz mode — 3500 ns
400 kHz mode — 1000 ns
110 T
BUF Bus Free Time 100 kHz mode
400 kHz mode
4.7 — s Time the bus must be free
before a new transmission
can start
1.3 — s
D102 CB Bus Capacitive Loading — 400 pF
Note 1: A Fast mode I
2
C bus device can be used in a Standard mode I
2
C bus system, but Parameter 107  250 ns
must then be met. This will automatically be the case if the device does not stretch the LOW period of the
SCLx signal. If such a device does stretch the LOW period of the SCLx signal, it must output the next data
bit to the SDAx line, Parameter 102 + Parameter 107 = 1000 + 250 = 1250 ns (for 100 kHz mode), before
the SCLx line is released.
Note: Refer to Figure 26-3 for load conditions.
90
91
92
100
101
103
106
107
109 109
110
102
SCLx
SDAx
In
SDAx
Out