PIC18F2455_09 Datasheet, PDF (400/438 Pages) Microchip Technology – 28/40/44-Pin,High-Performance,Enhanced Flash,USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
TABLE 28-20: I²C™ BUS DATA REQUIREMENTS (SLAVE MODE)
Param.
No.
Symbol
Characteristic
Min
Max Units
Conditions
100 THIGH Clock High Time 100 kHz mode
4.0
—
μs PIC18FXXXX must operate
at a minimum of 1.5 MHz
400 kHz mode
0.6
—
μs PIC18FXXXX must operate
at a minimum of 10 MHz
MSSP Module
1.5 TCY
—
101 TLOW Clock Low Time 100 kHz mode
4.7
—
μs PIC18FXXXX must operate
at a minimum of 1.5 MHz
400 kHz mode
1.3
—
μs PIC18FXXXX must operate
at a minimum of 10 MHz
MSSP Module
1.5 TCY
—
102 TR
SDA and SCL Rise 100 kHz mode
—
1000
Time
400 kHz mode 20 + 0.1 CB 300
ns
ns CB is specified to be from
10 to 400 pF
103 TF
SDA and SCL Fall 100 kHz mode
—
300
Time
400 kHz mode 20 + 0.1 CB 300
ns
ns CB is specified to be from
10 to 400 pF
90
TSU:STA Start Condition
100 kHz mode
4.7
—
μs Only relevant for Repeated
Setup Time
400 kHz mode
0.6
—
μs ^{Start condition}
91
THD:STA Start Condition
100 kHz mode
4.0
—
μs After this period, the first
Hold Time
400 kHz mode
0.6
—
μs ^{clock pulse is generated}
106 THD:DAT Data Input Hold 100 kHz mode
Time
400 kHz mode
0
—
ns
0
0.9 μs
107 TSU:DAT Data Input Setup 100 kHz mode
250
—
ns (Note 2)
Time
400 kHz mode
100
—
ns
92
TSU:STO Stop Condition
100 kHz mode
4.7
—
μs
Setup Time
400 kHz mode
0.6
—
μs
109 TAA
Output Valid from 100 kHz mode
Clock
400 kHz mode
—
3500 ns (Note 1)
—
—
ns
110 TBUF Bus Free Time
100 kHz mode
4.7
—
μs Time the bus must be free
400 kHz mode
1.3
—
μs ^{before a new transmission}
can start
D102 CB
Bus Capacitive Loading
—
400 pF
Note 1:
2:
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.
A Fast mode I²C™ bus device can be used in a Standard mode I²C bus system but the requirement,
TSU: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, TR max. + TSU:DAT = 1000 + 250 = 1250 ns (according to the
Standard mode I²C bus specification), before the SCL line is released.
DS39632E-page 398
© 2009 Microchip Technology Inc.