MCP9808
SENSOR SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, TA = -40°C to +125°C, GND = Ground
and CL = 80 pF. (Note 1)
Parameters
Sym
Min
Max
Units
Conditions
2-Wire SMBus/Standard Mode I2C™ Compatible Interface (Note 1)
Serial Port Clock Frequency
Low Clock
fSC
tLOW
0
1300
600
20
400
—
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
pf
(Note 2, 4)
(Note 2)
(Note 2)
High Clock
tHIGH
—
Rise Time
tR
300
300
—
Fall Time
tF
20
Data in Setup Time
Data In Hold Time
Data Out Hold Time
Start Condition Setup Time
Start Condition Hold Time
Stop Condition Setup Time
Bus Free
tSU-DI
tHD-DI
tHD-DO
tSU-START
tHD-START
tSU-STOP
tB-FREE
tOUT
100
0
(Note 3)
(Note 5)
(Note 4)
—
200
600
600
600
1300
25
900
—
—
—
—
Time-out
35
Bus Capacitive Load
Cb
—
400
Note 1: All values referred to VIL MAX and VIH MIN levels.
2: If tLOW > tOUT or tHIGH > tOUT, the temperature sensor I2C interface will time-out. A Repeat Start command
is required for communication.
3: This device can be used in a Standard mode I2C bus system, but the requirement, tSU-DI ≥ 100 ns, must
be met. This device does not stretch the SCL Low time.
4: As a transmitter, the device provides internal minimum delay time, tHD-DO MIN, to bridge the undefined
region (min. 200 ns) of the falling edge of SCL, tF MAX, to avoid unintended generation of Start or Stop
conditions.
5: As a receiver, SDA should not be sampled at the falling edge of SCL. SDA can transition tHD-DI 0 ns after
SCL toggles Low.
TIMING DIAGRAM
tHD-START
tSU-START
tB-FREE
tSU-STOP
tHIGH
tLOW
SCL
SDA
tOUT
tR, tF
tHD-DI/ HD-DO
t
tSU-DI
START Condition
Data Transmission
STOP Condition
© 2011 Microchip Technology Inc.
DS25095A-page 5
MICROCHIP [ MICROCHIP ]
