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MCP9844 Datasheet(PDF) 4 Page - Microchip Technology

Part # MCP9844
Description  짹1째C Accurate, 1.8V Digital Temperature Sensor
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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MCP9844
DS20005192A-page 4
 2013 Microchip Technology Inc.
TIMING DIAGRAM
SERIAL INTERFACE TIMING SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, GND = Ground, TA = -40°C to +125°C, and CL = 80 pF
Note 1
.
VDD= 1.7V to 3.6V
VDD= 2.2V to 3.6V
100 kHz
400 kHz
1000 kHz
Parameters
Sym
Min
Max
Min
Max
Min
Max
Units
2-Wire I2C™ Interface
Serial port frequency (Note 2, 4)fSCL
10
100
10
400
10
1000
kHz
Low Clock (Note 2)tLOW
4700
1300
500
ns
High Clock
tHIGH
4000
600
260
ns
Rise time (Note 5)tR
1000
20
300
120
ns
Fall time (Note 5)tF
20
300
20
300
120
ns
Data in Setup time (Note 3)tSU:DAT
250
100
—50
ns
Data in Hold time (Note 6)tHD:DI
0—
0
—0
ns
Data out Hold time (Note 4)tHD:DO
200
900
200
900
0
350
ns
Start Condition Setup time
tSU:STA
4700
600
260
ns
Start Condition Hold time
tHD:STA
4000
600
260
ns
Stop Condition Setup time
tSU:STO
4000
600
260
ns
Bus Idle/Free
tB-FREE
4700
1300
500
ns
Time out
tOUT
25
35
25
35
25
35
ms
Bus Capacitive load
Cb
——
400
100
pf
Note 1:
All values referred to VIL MAX and VIH MIN levels.
2:
If tLOW > 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:DAT  250 ns must
be met. This device does not stretch SCL Low period. It outputs the next data bit to the SDA line within tR
MAX + tSU:DAT MIN = 1000 ns + 250 ns = 1250 ns (according to the Standard-mode I
2C-bus specification)
before the SCL line is released.
4:
As a transmitter, the device provides internal minimum delay time tHD:DAT 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:
Characterized but not production tested.
6:
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.
Start Condition
Data Transmission
Stop Condition


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