ADM1029 데이터 시트보기 (PDF) - ON Semiconductor

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ADM1029

Dual PWM Fan Controller and Temperature Monitor for High Availability Systems

ON Semiconductor 

Pin No.

1

Mnemonic

DRIVE1

2

FAULT1

3

TACH1

4

PRESENT1

5

SCL

6

SDA

7

GND

8

VCC

9

CFAULT

10

INT

11

GPIO2

12

RESET

13

D1–/GPIO3

14

D1+/GPIO4

15

ADD

16

D2–/GPIO5

17

D2+/GPIO6

18

TMIN/INSTALL

19

AIN0/GPIO0

20

AIN1/GPIO1

21

PRESENT2

22

TACH2

23

FAULT2

24

DRIVE2

ADM1029

PIN FUNCTION DESCRIPTIONS

Description

Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of

Fan 1. Requires 10 kΩ typical pull-up resistor.

Open Drain Digital I/O. When used with a fan having a fault output, a Logic 0 input to this pin

signals a fault on Fan 1. Also used as a fault output.

Open Drain Digital Input. Digital fan tachometer input for Fan 1. Will accept logic signals up

to 5 V even when VCC is lower than 5 V.

Open Drain Digital Input. A shorting link in the fan connector holds this pin low when

Fan 1 is connected.

Open Drain Digital Input. Serial Bus Clock. Requires 2.2 kΩ pull-up typical.

Digital I/O. Serial Bus bidirectional data. Open-drain output requires 2.2 kΩ pull-up.

System Ground

Power (3.0 V to 5.5 V). Typically powered from 3.3 V power rail. Bypass with the parallel

combination of 10 µF (electrolytic or tantalum) and 0.1 µF (ceramic) bypass capacitors.

Open Drain Digital I/O. Cascade fault input/output used for fault signaling between

multiple ADM1029s.

Digital Output. Interrupt Request (Open Drain). The output is enabled when Bit 1 of the

Configuration Register is set to 0. The default state is enabled.

Open Drain Digital I/O. General-purpose logic I/O pin.

Open Drain Digital Input. Active low reset input.

Analog Input/Open Drain Digital I/O. Connected to cathode of external temperature-sensing

diode, or may be reconfigured as a general-purpose logic input/output.

Analog Input/Open Drain Digital I/O. Connected to anode of external temperature-sensing

diode, or may be reconfigured as a general-purpose logic input/output.

Eight-Level Analog Input. Used to set the three LSBs of the serial bus address.

Analog Input/Open Drain Digital I/O. Connected to cathode of external temperature-sensing

diode, or may be reconfigured as a general-purpose logic input/output.

Analog Input/Open Drain Digital I/O. Connected to anode of external temperature-sensing

diode, or may be reconfigured as a general-purpose logic input/output.

Eight-Level Analog Input. The voltage on this pin defines whether automatic fan speed control

is enabled, the minimum temperature at which the fan(s) will turn on in automatic speed con-

trol mode, and the number of fans that should be installed.

Analog Input/Open Drain Digital I/O. May be configured as a 0 V to 2.5 V analog input or as a

general-purpose digital I/O pin.

Analog Input/Open Drain Digital I/O. May be configured as a 0 V to 2.5 V analog input or as a

general-purpose digital I/O pin.

Open Drain Digital Input. A shorting link in the fan connector holds this pin low when Fan 2

is connected.

Open Drain Digital Input. Digital fan tachometer input for Fan 2. Will accept logic signals up

to 5 V even when VCC is lower than 5 V.

Open Drain Digital I/O. When used with a fan having a fault output, a Logic 0 input to this pin

signals a fault on Fan 2. Also used as a fault output.

Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of

Fan 2. Requires 10 kΩ typical pull-up resistor.

Rev. 1 | Page 4 of 50 | www.onsemi.com

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