PIC18F2220_07 Datasheet, PDF (337/386 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2220/2320/4220/4320
TABLE 26-19: 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 PIC18FXX20 must operate at a
minimum of 1.5 MHz
400 kHz mode
0.6
—
μs PIC18FXX20 must operate at a
minimum of 10 MHz
SSP module
1.5 TCY
—
101 TLOW Clock Low Time
100 kHz mode
4.7
—
μs PIC18FXX20 must operate at a
minimum of 1.5 MHz
400 kHz mode
1.3
—
μs PIC18FXX20 must operate at a
minimum of 10 MHz
SSP module
1.5 TCY
—
102 TR
SDA and SCL Rise 100 kHz mode
Time
400 kHz mode
—
1000
20 + 0.1 CB 300
ns
ns CB is specified to be from 10 to 400 pF
103 TF
SDA and SCL Fall
Time
100 kHz mode
—
300
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 Setup 100 kHz mode
4.7
Time
400 kHz mode
0.6
—
μs Only relevant for Repeated
—
μs ^{Start condition}
91
THD:STA Start Condition Hold 100 kHz mode
4.0
Time
400 kHz mode
0.6
—
μs After this period, the first clock pulse is
—
μs ^generated
106 THD:DAT Data Input Hold Time 100 kHz mode
0
—
ns
400 kHz mode
0
0.9
μs
107 TSU:DAT Data Input Setup
100 kHz mode
250
Time
400 kHz mode
100
—
ns (Note 2)
—
ns
92
TSU:STO Stop Condition Setup 100 kHz mode
4.7
Time
400 kHz mode
0.6
—
μs
—
μs
109 TAA
Output Valid from
Clock
100 kHz mode
400 kHz mode
—
3500 ns (Note 1)
—
—
ns
110 TBUF Bus Free Time
100 kHz mode
4.7
400 kHz mode
1.3
—
μs Time the bus must be free before a
—
μs ^{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.
© 2007 Microchip Technology Inc.
DS39599F-page 335