Rainbow-electronics DS1857 Manual de usuario descargar pdf (Pagina 4)

DS1857

Dual Temperature-Controlled Resistors with

External Temperature Input and Monitors

4 _____________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

Fast mode (Note 10) 0 400

SCL Clock Frequency f

SCL

Standard mode (Note 10) 0 100

kHz

Fast mode (Note 10) 1.3

Bus Free Time Between STOP and

START Condition

BUF

Standard mode (Note 10) 4.7

µs

Fast mode (Notes 10, 11) 0.6

Hold Time (Repeated)

START Condition

HD:STA

Standard mode (Notes 10, 11) 4.0

µs

Fast mode (Note 10) 1.3

Low Period of SCL Clock t

LOW

Standard mode (Note 10) 4.7

µs

Fast mode (Note 10) 0.6

High Period of SCL Clock t

HIGH

Standard mode (Note 10) 4.0

µs

Fast mode (Notes 10, 12, 13) 0 0.9

Data Hold Time

HD:DAT

Standard mode (Notes 10, 12, 13) 0

µs

Fast mode (Note 10)

100

Data Setup Time

SU:DAT

Standard mode (Note 10)

250

Fast mode (Note 10) 0.6

Start Setup Time

SU:STA

Standard mode (Note 10) 4.7

µs

Fast mode (Note 13)

20 + 0.1C

300

Rise Time of Both SDA and SCL

Signals

Standard mode (Note 13)

20 + 0.1C

1000

Fast mode (Note 13)

20 + 0.1C

300

Fall Time of Both SDA and SCL

Signals

Standard mode (Note 13)

20 + 0.1C

300

Fast mode 0.6

Setup Time for STOP Condition

SU:STO

Standard mode 4.0

µs

Capacitive Load for Each Bus Line

(Note 13) 400 pF

EEPROM Write Time t

(Note 14) 10 ms

AC ELECTRICAL CHARACTERISTICS

= 3.0V to 5.5V, T

= -40°C to +95°C, unless otherwise noted.)

Note 1: All voltages are referenced to ground.

Note 2: I/O pins of fast-mode devices must not obstruct the SDA and SCL lines if V

is switched off. The address inputs should be

connected to either V

or GND depending on the desired address setting.

Note 3: SDA and SCL are connected to V

and all other input signals are connected to well-defined logic levels.

Note 4: The maximum voltage the MON inputs will read is approximately 2.5V, even if the voltage on the inputs is greater than 2.5V.

Note 5: This voltage is defining the maximum range of the analog-to-digital converter and not the maximum V

voltage.

Note 6: Absolute linearity is the difference of measured value from expected value at DAC position. The expected value is a

straight line from measured minimum position to measured maximum position.

Note 7: Relative linearity is the deviation of an LSB DAC setting change vs. the expected LSB change. The expected LSB change

is the slope of the straight line from measured minimum position to measured maximum position.

Note 8: See the Typical Operating Characteristics.

Note 9: The conversion accuracy does not include any error from the LM50.

Note 10: A fast-mode device can be used in a standard-mode system, but the requirement t

SU:DAT

> 250ns must then be met. This

is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the

LOW period of the SCL signal, it must output the next data bit to the SDA line t

RMAX

+ t

SU:DAT

= 1000ns + 250ns = 1250ns

before the SCL line is released.

1 2 3 4 5 6 7 8 9 ... 21 22

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Rainbow-electronics DS1857 Manual de usuario Pagina 4

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