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ADM1029ARQ Datenblatt(PDF) 4 Page - Analog Devices

Teilenummer ADM1029ARQ
Bauteilbeschribung  Dual PWM Fan Controller and Temperature Monitor for High Availability Systems
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ADM1029ARQ Datenblatt(HTML) 4 Page - Analog Devices

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REV. 0
ADM1029
–4–
PIN FUNCTION DESCRIPTIONS
Pin No.
Mnemonic
Description
1
DRIVE1
Open Drain Digital Output. Pulsewidth Modulated (PWM) output to control the speed of
Fan 1. Requires 10 k
Ω 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 k
Ω pull-up typical.
6
SDA
Digital I/O. Serial Bus bidirectional data. Open-drain output requires 2.2 k
Ω pull-up.
7
GND
System Ground
8VCC
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.
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 con-
trol 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 k
Ω typical pull-up resistor.


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