3

TCM1617

TCM1617-1 2/5/99

 2001 Microchip Technology Inc.

DS21485A

SMBus Thermal Sensor with External Diode Input

NOTES: 1. Operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles.

Transient current may exceed this specification.

2. For true reccurring conversion time see Conversion Rate register description.

3. Output current should be minimized for best temperature accuracy. Power dissipation within the TCM1617 will cause self-heating and

temperature drift error.

4. Refer to Application Note 64.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

SMBus Clock Frequency

10

—

100

KHz

Low Clock Period

10% to 10%

4.7

—

—

µsec

High Clock Period

90% to 90%

4

—

—

µsec

SMBus Rise Time

10% to 90%

—

—

1,000

nsec

SMBus Fall Time

90% to 10%

—

—

300

nsec

Start Condition Setup Time

90% SCL to 10% SDA

4

—

—

µsec

(for Repeated Start Condition)

Start Condition Hold Time

4

—

—

µsec

Data in Set Up Time

1000

—

—

nsec

Data in Hold Time

1250

—

—

nsec

Stop Condition Setup Time

4

—

—

µsec

Bus Free Time Prior to

4.7

—

—

µsec

New Transition

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Conversion Time

from CHIP STOP to Conv.

54

83

112

msec

Complete (Note 2)

∆CR

Conversion Rate Accuracy

See Conversion Rate Register Desc.

–35

—

+35

%

2-Wire SMBus Interface

Logic Input High

2.2

——

V

Logic Input Low

—

—

0.8

V

SDA Output Low

—

—

0.4

V

—

—

0.6

V

Input Capacitance SDA, SCL

—

5

—

pF

I/O Leakage

–1

0.1

1

µA