LM40 datasheet(5/27 Pages) NSC

5 / 27 page

TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

Diode Source Current

D+ −VD−) = +0.65 V; High Current

188

280

µA (max)

Low Current

11.75

µA

Diode Source Current High Current to Low Current

Ratio

ANALOG TO DIGITAL CONVERTER CHARACTERISTICS

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

TUE

Total Unadjusted Error(Note 11)

±2

%FS

(max)

Resolution

Bits

DNL

Differential Non-linearity

LSB

Power Supply Sensitivity

±1

%/V

Input Resistance, all analog inputs (total resistance

of divider chain)

210

140

Ω (min)

400

Ω (max)

SWD and ADD DIGITAL INPUT CHARACTERISTICS

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

SWD Logical High Input Voltage

2.1

V (min)

V+ + 0.5

V (max)

SWD Logical Low Input Voltage

0.8

V (max)

-0.5

V (min)

ADD Logical High Input Voltage

90%xV+

V (min)

ADD Logical Low Input Voltage

10%xV+

V (max)

HYST

Input Hysteresis

300

SWD and ADD Input Current

GND

≤ V

≤ V+

±0.005

±10

µA (max)

SWD Input Current with V+ Open or

Grounded

GND

≤ V

≤ 3.6V,

and V+ Open or

GND

±0.005

µA

Digital Input Capacitance

SWD DIGITAL OUTPUT CHARACTERISTICS

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

Open-drain Output Logic “Low”

Voltage

OL = 4mA

0.4

V (max)

OL = 50µA

0.2

V (max)

Open-drain Output Off Current

±0.005

±10

µA (max)

OUT

Digital Output Capacitance

AC Electrical Characteristics

The following specification apply for V+ = +3.0 V

DC to +3.6 VDC, unless otherwise specified. Boldface limits apply for

A =TJ =TMIN=0˚C to TMAX=85˚C; all other limits TA =TJ = 25˚C. The SensorPath Characteristics conform to the SensorPath

specification revision 0.98. Please refer to that speciation for further details.

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limits)

HARDWARE MONITOR CHARACTERISTICS

CONV

Total Monitoring Cycle Time (Note 13)

All Voltage and

Temperature readings

(Default)

182

163.8

ms (min)

200.2

ms (max)

SensorPath Bus CHARACTERISTICS

SWD fall time (Note 16)

pull-up=1.25 k

Ω ±30%,

L=400 pF

300

ns (max)

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