LTM2892 datasheet(22/38 Pages) LINER

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LTM2892

2892fa

For more information www.linear.com/LTM2892

Thelogicsidebidirectionalserialdatapin,SDA1,requiresa

pull-upresistororcurrentsourceconnectedtoVL1.Follow

the requirements in Figures 12 and 13 for the appropriate

pull-up resistor on SDA1 that satisfies the desired rise

time specifications and VOL maximum limits for fast and

standard modes. The resistance curves represent the

maximum resistance boundary; any value may be used

to the left of the appropriate curve.

The isolated side clock pin, SCLOUT, has a weak push-

pull output driver; do not connect an external pull-up

device. SCLOUT is compatible with I2C devices without

clock stretching. On lightly loaded connections, a 100pF

applicaTions inForMaTion

capacitor from SCLOUT to GND2 or RC lowpass filter (R

= 500Ω, C = 100pF) can be used to decrease the rise and

fall times and minimize noise.

Some consideration must be given to signal coupling

between SCLOUT and SDA2. Separate these signals on a

printedcircuitboardorroutewithgroundbetween.Ifthese

signals are wired off board, twist SCLOUT with VL2 and/

or GND2 and SDA2 with GND2 and/or VL2; do not twist

SCLOUT and SDA2 together. If coupling between SCLOUT

andSDA2isunavoidable,placetheaforementionedRCfilter

at the SCLOUT pin to reduce noise injection onto SDA2.

Figure 12. Maximum Standard Speed Pull-Up

Resistance on SDA1

Figure 13. Maximum Fast Speed Pull-Up Resistance on SDA1

CBUS (pF)

100

2892 F12

1000

VL1 = 3.0V

VL1 = 3.3V

VL1 = 3.6V

VL1 = 4.5V TO 5.5V

CBUS (pF)

100

2892 F13

1000

VL1 = 3.0V

VL1 = 3.3V

VL1 = 3.6V

VL1 = 4.5V TO 5.5V

LTM2892 Datasheet(PDF) 22 Page - Linear Technology

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