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ADM1026JST-REEL7 View Datasheet(PDF) - ON Semiconductor

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ADM1026JST-REEL7
ON-Semiconductor
ON Semiconductor ON-Semiconductor
ADM1026JST-REEL7 Datasheet PDF : 55 Pages
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ADM1026
Pin No.
Mnemonic
Type
Description
17
INT
Digital Output Interrupt Request (Open Drain). The output is enabled when Bit 1 of the
configuration register is set to 1. The default state is disabled. It has an onchip
100 kW pullup resistor.
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 PowerOn Reset. 5 mA driver (weak 100 kW pullup), active low output (100 kW
pullup) 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
PowerOn Reset. 5 mA driver (weak 100 kW pullup), active low output (100 kW
pullup) 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 poweron, 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 V2.5 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 +3.0 V.
30
+5.0 VIN
Analog Input
Monitors the +5.0 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
Generalpurpose 0 V to 2.5 V analog inputs.
35
AIN6
Analog Input
Generalpurpose 0 V to 2.5 V analog inputs.
36
AIN5
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
37
AIN4
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
38
AIN3
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
39
AIN2
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
40
AIN1
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
41
AIN0
Analog Input
Generalpurpose 0 V to 3.0 V analog inputs.
42
GPIO16/THERM
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output. Can
also be configured as a bidirectional THERM pin (100 kW pullup).
43
GPIO15
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
44
GPIO14
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
45
GPIO13
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
46
GPIO12
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
47
GPIO11
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
48
GPIO10
Digital I/O
Generalpurpose I/O pin that can be configured as a digital input or output.
†GPIO pins are open drain and require external pullup resistors. Fan inputs have integrated 10 kW pullups, but these pins become open drain
when reconfigured as GPIOs.
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