Rainbow-electronics DS3903 Bedienungsanleitung PDF herunterladen (Seite 4)

DS3903

Triple 128-Position Nonvolatile

Digital Potentiometer

4 ______________________________________________________________________

Note 1: All voltages are referenced to ground.

Note 2: I

STBY

specified for V

equal to 3.0V and 5.0V while control port logic pins are driven to the appropriate

logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of ground or V

for the

corresponding inactive state. WP must be disconnected or connected high.

Note 3: I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V

is switched off.

Note 4: 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.

Note 5: After this period, the first clock pulse is generated.

Note 6: The maximum t

HD:DAT

has only to be met if the device does not stretch the low period (t

LOW

) of the

SCL signal.

Note 7: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V

IN MIN

the SCL signal) in order to bridge the undefined region of the falling edge of SCL.

Note 8: C

—total capacitance of one bus line in picofarads, timing referenced to 0.9 x V

and 0.1 x V

Note 9: EEPROM write begins after a stop condition occurs.

Note 10: Absolute linearity is used to measure expected wiper voltage as determined by wiper position in a

voltage-divider configuration.

Note 11: Relative linearity is used to determine the change of wiper voltage between two adjacent wiper positions

in a voltage-divider configuration.

Typical Operating Characteristics

= 5.0V, 10kΩ plots apply to both pot0 and pot2, T

= +25°C unless otherwise noted.)

100

W-L RESISTANCE

vs. WIPER SETTING (90k

Ω)

DS3903 toc03

WIPER SETTING

W-L RESISTANCE (kΩ)

1251007550250

W-L RESISTANCE

vs. WIPER SETTING (10k

Ω)

DS3903 toc02

WIPER SETTING

W-L RESISTANCE (kΩ)

125100755025

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

DS3903 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

5040-30 -20 -10 10 20030

100

120

140

160

-40 60 70 80

= 5V

= 3V

1 2 3 4 5 6 7 8 9 10 11

Digital Potentiometer 1

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