TMP435

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SBOS495A – MARCH 2010 – REVISED APRIL 2010

ELECTRICAL CHARACTERISTICS

TMP435

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

TEMPERATURE ERROR

Local Temperature Sensor

±1.25

±2.5

°C

±0.25

±1

°C

±0.25

±1

°C

±0.5

±1.5

°C

±3

±5

°C

vs Supply (Local/Remote)

±0.2

±0.5

°C/V

TEMPERATURE MEASUREMENT

Conversion Time (per channel)

Local Channel

12

15

17

ms

Remote Channel

RC = 1

97

126

137

ms

RC = 0

36

47

52

ms

RC = 1

72

93

100

ms

RC = 0

33

44

47

ms

Resolution

Local Channel

12

Bits

Remote Channel

12

Bits

Remote Sensor Source Currents

High

120

mA

Medium High

60

mA

Medium Low

12

mA

Low

6

mA

Remote Transistor Ideality Factor

n

TMP435 optimized ideality factor

Beta Correction Range

b

0.1

27

SMBus INTERFACE

Logic Input High Voltage (SCL, SDA)

2.1

V

Logic Input Low Voltage (SCL, SDA)

0.8

V

Hysteresis

500

mV

SMBus Output Low Sink Current

6

mA

SDA Output Low Voltage

0.15

0.4

V

Logic Input Current

0

–1

+1

mA

SMBus Input Capacitance (SCL, SDA)

3

pF

SMBus Clock Frequency

3.4

MHz

SMBus Timeout

25

32

35

ms

SCL Falling Edge to SDA Valid Time

1

ms

DIGITAL OUTPUTS

Output Low Voltage

0.15

0.4

V

High-Level Output Leakage Current

0.1

1

mA

ALERT/THERM2 Output Low Sink Current

ALERT/THERM2 Forced to 0.4V

6

mA

THERM Output Low Sink Current

THERM2 Forced to 0.4V

6

mA

(1)

Tested with less than 5

(2)

Beta correction configuration set to '1000' and sensor is GND collector-connected (PNP collector to ground).

(3)

Beta correction configuration set to '0111' or sensor is diode-connected (base shorted to collector).

(4)

If beta correction is disabled ('0111'), then up to 1k

Ω of series line resistance is cancelled; if beta correction is enabled ('1xxx'), up to

300

Ω is cancelled.

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