Datasheet
PIC16F818/819
DS39598F-page 138 2001-2013 Microchip Technology Inc.
TABLE 15-8: I
2
C™ BUS DATA REQUIREMENTS
Param.
No.
Symbol Characteristic Min Max Units Conditions
100* T
HIGH Clock High Time 100 kHz mode 4.0 — s
400 kHz mode 0.6 — s
SSP Module 1.5 T
CY —
101* TLOW Clock Low Time 100 kHz mode 4.7 — s
400 kHz mode 1.3 — s
SSP Module 1.5 T
CY —
102* TR SDA and SCL Rise
Time
100 kHz mode — 1000 ns
400 kHz mode 20 + 0.1 CB 300 ns CB is specified to be from
10-400 pF
103* T
F SDA and SCL Fall
Time
100 kHz mode — 300 ns
400 kHz mode 20 + 0.1 CB 300 ns CB is specified to be from
10-400 pF
90* T
SU:STA Start Condition
Setup Time
100 kHz mode 4.7 — s Only relevant for Repeated
Start condition
400 kHz mode 0.6 — s
91* T
HD:STA Start Condition Hold
Time
100 kHz mode 4.0 — s After this period, the first
clock pulse is generated
400 kHz mode 0.6 — s
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 2)
400 kHz mode 100 — ns
92* T
SU:STO Stop Condition
Setup Time
100 kHz mode 4.7 — s
400 kHz mode 0.6 — s
109* TAA Output Valid from
Clock
100 kHz mode — 3500 ns (Note 1)
400 kHz mode — — ns
110* T
BUF Bus Free Time 100 kHz mode 4.7 — s Time the bus must be free
before a new transmission
can start
400 kHz mode 1.3 — s
CB Bus Capacitive Loading — 400 pF
* These parameters are characterized but not tested.
Note 1: As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region
(min. 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
2: A Fast mode (400 kHz) I
2
C™ bus device can be used in a Standard mode (100 kHz) I
2
C bus system but
the requirement, T
SU:DAT 250 ns, must then be met. This will automatically be the case if the device does
not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL
signal, it must output the next data bit to the SDA line, T
R max. + TSU:DAT = 1000 + 250 = 1250 ns
(according to the Standard mode I
2
C bus specification), before the SCL line is released.