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 on−chip
100 kW pullup resistor.
18
19
20
PWM
Digital Output
Digital Output
Digital I/O
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.
RESETSTBY
RESETMAIN
Power−On 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.
Power−On 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
22
23
24
25
AGND
3.3 V STBY
DAC
Ground
Ground pin for analog circuits.
Power Supply
Analog Output
Analog Output
Analog Input
Supplies 3.3 V power. Also monitors the 3.3 V standby power rail.
0 V to 2.5 V output for analog control of the fan speed.
Reference Voltage Output. Can be selected as 1.8 V (default) or 2.5 V.
V
REF
D1–/NTESTIN
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
27
D1+
Analog Input
Connected to the anode of the first remote temperature sensing diode.
D2–/A
D2+/A
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.
IN9
28
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.
IN8
29
30
31
32
33
34
35
36
37
38
39
40
41
42
V
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Monitors battery voltage, nominally +3.0 V.
Monitors the +5.0 V supply.
BAT
+5.0 V
IN
IN
IN
−12 V
Monitors the −12 V supply.
+12 V
Monitors the +12 V supply.
+V
Monitors the processor core voltage (0 V to 3.0 V).
General−purpose 0 V to 2.5 V analog inputs.
General−purpose 0 V to 2.5 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
General−purpose 0 V to 3.0 V analog inputs.
CCP
A
A
A
A
A
A
A
A
IN7
IN6
IN5
IN4
IN3
IN2
IN1
IN0
†
GPIO16/THERM
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 kW pullup).
Digital I/O
†
43
44
45
46
47
48
GPIO15
GPIO14
GPIO13
GPIO12
GPIO11
GPIO10
General−purpose I/O pin that can be configured as a digital input or output.
General−purpose I/O pin that can be configured as a digital input or output.
General−purpose I/O pin that can be configured as a digital input or output.
General−purpose I/O pin that can be configured as a digital input or output.
General−purpose I/O pin that can be configured as a digital input or output.
General−purpose I/O pin that can be configured as a digital input or output.
Digital I/O
†
Digital I/O
†
Digital I/O
†
Digital I/O
†
Digital I/O
†
Digital I/O
†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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