ADM1034ARQZ datasheet(5/39 Pages) ONSEMI

5 / 39 page

ADM1034

http://onsemi.com

ELECTRICAL CHARACTERISTICS (TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. (Note 1)

Parameter

Unit

Max

Typ

Min

Test Conditions / Comments

AGTL + INPUT (THERM)

Input High Level

0.75 x

REF

Input Low Level

0.4

Tachometer Accuracy

Fan Speed Measurement Accuracy

±4.0

SERIAL BUS TIMING (Note 4)

Clock Frequency, fSCLK

See Figure 2

400

kHz

Glitch Immunity, tSW

See Figure 2

Bus Free Time, tBUF

See Figure 2

1.3

Start Setup Time, tSU:STA

See Figure 2

0.6

Start Hold Time, tHD:STA

See Figure 2

0.6

Stop Condition Setup Time tSU:STO

See Figure 2

0.6

SCL Low Time, tLOW

See Figure 2

1.3

SCL High Time, tHIGH

See Figure 2

0.6

SCL, SDA Rise Time, tr

See Figure 2

1000

SCL, SDA Fall Time, tf

See Figure 2

300

Data Setup Time, tSU:DAT

See Figure 2

100

Detect Clock Low Timeout, tTIMEOUT

See Note 5

1. Typicals are at TA = 25°C and represent most likely parametric norm. Standby current typ. is measured with VCC = 3.3 V. Timing specifications

are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.1 V for a rising edge.

2. Operation at 5.5 V is guaranteed by design, not production tested.

3. Recommend use of 100 kW pullup resistors for all open−drain outputs from the ADM1034.

4. Guaranteed by design, not production tested.

5. SMBus timeout disabled by default. See the SMBus section for more information.

Figure 2. Serial Bus Timing Diagram

tLOW

tHD:STA

tHD:DAT

tSU:DAT

tSU:STA

tHD:STA

tSU:STO

tHIGH

SCL

SDA

tBUF

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