MCP9808 datasheet(5/52 Pages) MICROCHIP

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DS25095A-page 5

MCP9808

TIMING DIAGRAM

SENSOR SERIAL INTERFACE TIMING SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, V

DD = 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

fSC

0400

kHz

(Note 2, 4)

Low Clock

tLOW

1300

—

(Note 2)

High Clock

tHIGH

600

—

(Note 2)

Rise Time

300

Fall Time

300

Data in Setup Time

tSU-DI

100

—

(Note 3)

Data In Hold Time

tHD-DI

0—

(Note 5)

Data Out Hold Time

tHD-DO

200

900

(Note 4)

Start Condition Setup Time

tSU-START

600

—

Start Condition Hold Time

tHD-START

600

—

Stop Condition Setup Time

tSU-STOP

600

—

Bus Free

tB-FREE

1300

—

Time-out

tOUT

Bus Capacitive Load

—400

Note 1:

All values referred to VIL MAX and VIH MIN levels.

If tLOW > tOUT or tHIGH > tOUT, the temperature sensor I

2C interface will time-out. A Repeat Start command

is required for communication.

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.

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.

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.

tSU-START

tHD-START

tSU-DI

tSU-STOP

tB-FREE

SCL

SDA

tHD-DI/tHD-DO

tHIGH

tLOW

tOUT

tR, tF

START Condition

Data Transmission

STOP Condition

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