Rainbow-electronics MAX6642 Manual do Utilizador descarregar pdf (Página 3)

MAX6642

±1°C, SMBus-Compatible Remote/Local

Temperature Sensor with Overtemperature Alarm

_______________________________________________________________________________________ 3

Note 1: All parameters tested at T

= +25°C. Specifications over temperature are guaranteed by design.

Note 2: Timing specifications guaranteed by design.

Note 3: The serial interface resets when SCLK is low for more than t

TIMEOUT

Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCLK’s falling edge.

ELECTRICAL CHARACTERISTICS (continued)

= +3.0V to +5.5V, T

= -40°C to +125°C, unless otherwise specified. Typical values are at V

= +3.3V and T

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SMBus-COMPATIBLE INTERFACE (SCLK and SDA)

Logic Input Low Voltage V

0.8 V

Logic Input High Voltage V

= 3.0V 2.2 V

Input Leakage Current I

LEAK

= GND or 5.5V -1 +1 µA

Output Low Sink Current I

= 0.6V 6 mA

Input Capacitance C

5pF

SMBus TIMING (Note 2)

Serial Clock Frequency f

SCLK

(Note 3) 100 kHz

Bus Free Time Between STOP

and START Condition

BUF

4.7 µs

START Condition Setup Time 4.7 µs

Repeat START Condition Setup

Time

SU:STA

90% to 90% 50 ns

START Condition Hold Time t

HD:STA

10% of SDA to 90% of SCLK 4 µs

STOP Condition Setup Time t

SU:STO

90% of SCLK to 90% of SDA 4 µs

Clock Low Period t

LOW

10% to 10% 4.7 µs

Clock High Period t

HIGH

90% to 90% 4 µs

Data Setup Time t

HD:DAT

(Note 4) 250 µs

Receive SCLK/SDA Rise Time t

1µs

Receive SCLK/SDA Fall Time t

300 ns

Pulse Width of Spike Suppressed t

050ns

SMBus Timeout t

TIMEOUT

SDA low period for interface reset 20 28 40 ms

1 2 3 4 5 6 7 8 ... 12 13

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