Data Sheet

ADT7470

Rev. E | Page 3 of 40

SPECIFICATIONS

Table 1.

Parameter1, 2, 3, 4, 5

Min

Typ

Max

Unit

Test Conditions/Comments

POWER SUPPLY1

Supply Voltage

3.0

3.3

5.5

V

0.5

0.8

mA

4

µA

FAN RPM-TO-DIGITAL CONVERTER

Accuracy

±12

%

Full-Scale Count

65,535

Nominal Input RPM

109

RPM

Fan count = 0xBFFF

329

RPM

Fan count = 0x3FFF

5,000

RPM

Fan count = 0x0438

10,000

RPM

Fan count = 0x021C

OPEN-DRAIN DIGITAL OUTPUTS, PWM1 to PWM4, SMBALERT

0.4

V

0.1

1

µA

OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)

0.4

V

0.1

1

µA

SMBus DIGITAL INPUTS (SCL, SDA)

2.4

V

1.0

V

Hysteresis

500

mV

DIGITAL INPUT LOGIC LEVELS (TACH INPUTS, FULL_SPEED, GPIO)

2.4

V

0.8

V

Hysteresis

50

mV p-p

DIGITAL INPUT LOGIC LEVELS (TMP_IN)

V

0.4

V

DIGITAL INPUT CURRENT

–5

µA

5

µA

5

pF

1

2

All voltages are measured with respect to GND, unless otherwise specified.

3

Typical values are at %A = 25

°C and represent the most likely parametric norm.

4

Logic inputs accept input high voltages up to 5 V even when the device is operating at supply voltages below 5 V.

5