5.3 DC Electrical Characteristics

TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS

The following specifications apply for VDD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS = 50 Ω unless

otherwise specified in the conditions. Boldface limits apply for TA = TMIN to TMAX; all other limits TA = +25°C.

Parameter

Conditions

Typical

(1)

Limits

(2)

Units

(Limits)

Temperature Error using a diode-connected

MMBT3904 transistor. TD is the Remote Diode

Junction Temperature.

TD = TLM64 + 16°C

TA = +30°C to

+50°C

TD = +120°C to

+140°C

±1

°C (max)

TA = +0°C to +85°C TD = +25°C to

+140°C

±3

°C (max)

Temperature Error Using the Local Diode

TA = +25°C to +125°C (3)

±1

±3

°C (max)

Remote Diode Resolution

11

Bits

0.125

°C

Local Diode Resolution

8

Bits

1

°C

Conversion Time of All Temperatures

Fastest Setting

31.25

34.4

ms (max)

D− Source Voltage

0.7

V

Diode Source Current

(VD+ − VD−) = +0.65 V; High Current

160

315

µA (max)

110

µA (min)

Low Current

13

20

µA (max)

7

µA (min)

(1)

“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical

design calculations.

(2)

Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).

(3)

Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of

the internal power dissipation of the LM64 and the thermal resistance. See AN-1187 (SNOA401) for the thermal resistance to be used

in the self-heating calculation.

5.4 Operating Electrical Characteristics

Parameter

Conditions

Typ

(1)

Limits

(2)

Units

ALERT, T_Crit and PWM Output Saturation Voltage

ALERT, T_Crit

PWM

IOUT

4 mA

6 mA

0.4

V (max)

IOUT

6 mA

0.55

Power-On-Reset Threshold Voltage

2.4

V (max)

1.8

V (min)

Supply Current (3)

SMBus Inactive, 16 Hz

Conversion Rate

1.1

2.0

mA (max)

STANDBY Mode

320

µA

(1)

“Typicals” are at TA = 25°C and represent most likely parametric norm. They are to be used as general reference values not for critical

design calculations.

(2)

Limits are guaranteed to TI's AOQL (Average Outgoing Quality Level).

(3)

The supply current will not increase substantially with an SMBus transaction.

LM64

SNAS207B – MAY 2004 – REVISED JANUARY 2024

www.ti.com

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