ADM1029(2012) Просмотр технического описания (PDF) - ON Semiconductor

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ADM1029
(Rev.:2012)

Dual PWM Fan Controller and Temperature Monitor for High Availability Systems

ON Semiconductor 

ADM1029

Table 3. PIN FUNCTION DESCRIPTIONS

Pin No.

1

Mnemonic

DRIVE1

Description

Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of Fan 1.

Requires 10 kW typical pull-up resistor.

2

FAULT1

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.

3

TACH1

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.

4

PRESENT1

Open Drain Digital Input. A shorting link in the fan connector holds this pin low when Fan 1 is

connected.

5

SCL

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

6

SDA

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

7

GND

System Ground

8

VCC

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

10 mF (electrolytic or tantalum) and 0.1 mF (ceramic) bypass capacitors.

9

CFAULT

Open Drain Digital I/O. Cascade fault input/output used for fault signaling between multiple ADM1029s.

10

INT

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.

11

GPIO2

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

12

RESET

Open Drain Digital Input. Active low reset input.

13

D1−/GPIO3

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.

14

D1+/GPIO4

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.

15

ADD

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

16

D2−/GPIO5

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.

17

D2+/GPIO6

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.

18

TMIN/INSTALL 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 control mode,

and the number of fans that should be installed.

19

AIN0/GPIO0

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.

20

AIN1/GPIO1

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.

21

PRESENT2

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

connected.

22

TACH2

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.

23

FAULT2

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.

24

DRIVE2

Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of Fan 2.

Requires 10 kW typical pull-up resistor.

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