Rainbow-electronics LM40 Manual do Utilizador descarregar pdf (Página 6)

AC Electrical Characteristics (Continued)

The following specification apply for V+ = +3.0 V

to +3.6 V

, unless otherwise specified. Boldface limits apply for

MIN

=0˚C to T

MAX

=85˚C; all other limits T

= 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)

SWD rise time (Note 16) R

pull-up

=1.25 kΩ

30%,

=400 pF

1000 ns (max)

INACT

Minimum inactive time (bus at high level)

guaranteed by the slave before an attention

request

11 µs (min)

Mtr0

Master drive for Data Bit 0 write and for Data

Bit 0-1read

11.8 µs (min)

17.0 µs (max)

Mtr1

Master drive for Data Bit 1 write 35.4 µs (min)

48.9 µs (max)

SFEdet

Time allowed for LM40 activity detection 9.6 µs (max)

SLout1

LM40 drive for Data Bit 1 read by master 28.3 µs (min)

38.3 µs (max)

MtrS

Master drive for Start Bit 80 µs (min)

109 µs (max)

SLoutA

LM40 drive for Attention Request 165 µs (min)

228 µs (max)

RST

Master or LM40 drive for Reset 354 µs (min)

RST_MAX

Maximum drive of SWD by an LM40, after the

power supply is raised above 3V

500 ms (max)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed

specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test

conditions.

Note 2: All voltages are measured with respect to GND, unless otherwise noted.

Note 3: When the input voltage (V

) at any pin exceeds the power supplies (V

GND or V

V+), the current at that pin should be limited to 5 mA. Parasitic

components and/or ESD protection circuitry are shown below for the LM40’s pins. The nominal breakdown voltage of the zener is 6.5 V. SNP stands for snap-back

device.

LM40

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