ADT7470 データシートの表示（PDF） - Analog Devices
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ADT7470 Datasheet PDF : 40 Pages
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Data Sheet
ADT7470
SPECIFICATIONS
TA = −40oC to +125oC, VCC = 3.0 V to 5.5 V, unless otherwise noted.
Table 1.
Parameter1, 2, 3, 4, 5
POWER SUPPLY1
Supply Voltage
Supply Current, ICC
Standby Current, ICC
FAN RPM-TO-DIGITAL CONVERTER
Accuracy
Full-Scale Count
Nominal Input RPM
OPEN-DRAIN DIGITAL OUTPUTS, PWM1 to PWM4, SMBALERT
Output Low Voltage, VOL
High Level Output Current, IOH
OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)
Output Low Voltage, VOL
High Level Output Current, IOH
SMBus DIGITAL INPUTS (SCL, SDA)
Input High Voltage, VIH
Input Low Voltage, VIL
Hysteresis
DIGITAL INPUT LOGIC LEVELS (TACH INPUTS, FULL_SPEED, GPIO)
Input High Voltage, VIH
Input Low Voltage, VIL
Hysteresis
DIGITAL INPUT LOGIC LEVELS (TMP_IN)
Input High Voltage, VIH
Input Low Voltage, VIL
DIGITAL INPUT CURRENT
Input High Current, IIH
Input Low Current, IIL
Input Capacitance, CIN
Min
Typ Max Unit Test Conditions/Comments
3.0
3.3
5.5
V
0.5
0.8
mA
4
µA
±12 %
65,535
109
RPM
329
RPM
5,000
RPM
10,000
RPM
Fan count = 0xBFFF
Fan count = 0x3FFF
Fan count = 0x0438
Fan count = 0x021C
0.4
V
0.1
1
µA
IOUT = –8.0 mA, VCC = +3.3 V
VOUT = VCC
0.4
V
0.1
1
µA
IOUT = –4.0 mA, VCC = +3.3 V
VOUT = VCC
2.4
V
1.0
V
VCC = 3.3 V
500
mV
2.4
V
0.8
V
50
mV p-p
VDD – 0.3
V
0.4
V
–5
µA
VIN = VCC
5
µA
VIN = 0
5
pF
1 VDD should never be floated in the presence of SCL/SDA activity. Charge injection can be sufficient to induce approximately 0.6 V on VDD.
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 Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge and VIH = 2.0 V for a rising edge.
Rev. E | Page 3 of 40
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