ADM1026 datasheet(7/56 Pages) AD

No. de pieza	ADM1026

Descripción Electrónicos	Complete Thermal and System Management Controller

Download	56 Pages

Scroll/Zoom	100%

Fabricante Electrónico	AD [Analog Devices]

Página de inicio	http://www.analog.com

Logo

7 / 56 page

ADM1026

Rev. A | Page 7 of 56

Pin No.

Mnemonic

Type

Description

18

PWM

Digital Output

Open drain pulse width modulated output for control of the fan speed. This pin defaults

to high for the 100% duty cycle for use with NMOS drive circuitry. If a PMOS device is used

to drive the fan, the PWM output may be inverted by setting Bit 1 of Test Register 1 = 1.

19

RESETSTBY

Digital Output

Power-On Reset. 5 mA driver (weak 100 kΩ pull-up), active low output (100 kΩ pull-up)

with a 180 ms typical pulse width. RESETSTBY is asserted whenever 3.3 V STBY is below

the reset threshold. It remains asserted for approximately 180 ms after 3.3 V STBY rises

above the reset threshold.

20

RESETMAIN

Digital I/O

Power-On Reset. 5 mA driver (weak 100 kΩ pull-up), active low output (100 kΩ pull-up)

with a 180 ms typical pulse width. RESETMAIN is asserted whenever 3.3 V MAIN is below

the reset threshold. It remains asserted for approximately 180 ms after 3.3 V MAIN rises

above the reset threshold. If, however, 3.3 V STBY rises with or before 3.3 V MAIN, then

RESETMAIN remains asserted for 180 ms after RESETSTBY is deasserted. Pin 20 also

functions as an active low RESET input.

21

AGND

Ground

Ground pin for analog circuits.

22

3.3 V STBY

Power Supply

Supplies 3.3 V power. Also monitors the 3.3 V standby power rail.

23

DAC

Analog Output

0 V to 2.5 V output for analog control of the fan speed.

24

VREF

Analog Output

Reference Voltage Output. Can be selected as 1.8 V (default) or 2.5 V.

25

D1–/NTESTIN

Analog Input

Connected to a cathode of the first remote temperature sensing diode. If it is held high at

power-on, it activates the NAND tree test mode.

26

D1+

Analog Input

Connected to the anode of the first remote temperature sensing diode.

27

D2–/AIN9

Programmable

Connected to the cathode of the second remote temperature sensing diode, or the

analog input may be reconfigured as a 0 V− 2.5 V analog input.

28

D2+/AIN8

Programmable

Connected to the anode of the second remote temperature sensing diode, or the analog

input may be reconfigured as a 0 V − 2.5 V analog input.

29

VBAT

Analog Input

Monitors battery voltage, nominally +3 V.

30

+5 VIN

Analog Input

Monitors the +5 V supply.

31

−12 VIN

Analog Input

Monitors the

−12 V supply.

32

+12 VIN

Analog Input

Monitors the +12 V supply.

33

+VCCP

Analog Input

Monitors the processor core voltage (0 V to 3.0 V).

34

AIN7

Analog Input

General-purpose 0 V to 2.5 V analog inputs.

35

AIN6

Analog Input

General-purpose 0 V to 2.5 V analog inputs.

36

AIN5

Analog Input

General-purpose 0 V to 3 V analog inputs.

37

AIN4

Analog Input

General-purpose 0 V to 3 V analog inputs.

38

AIN3

Analog Input

General-purpose 0 V to 3 V analog inputs.

39

AIN2

Analog Input

General-purpose 0 V to 3 V analog inputs.

40

AIN1

Analog Input

General-purpose 0 V to 3 V analog inputs.

41

AIN0

Analog Input

General-purpose 0 V to 3 V analog inputs.

42

GPIO16/THERM

Digital I/O1

General-purpose I/O pin that can be configured as a digital input or output. Can also be

configured as a bidirectional THERM pin (100 kΩ pull-up).

43

GPIO15

Digital I/O1