ADM1026JST ON Semiconductor, ADM1026JST Datasheet - Page 4

• Manufacturer Part Number: ADM1026JST
• Description: IC CNTRL SYS REF/EEPROM 48LQFP
• Manufacturer: ON Semiconductor

Specifications of ADM1026JST

• Rohs Status: RoHS non-compliant
• Function: Hardware Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 100°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 48-LFQFP

†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.
Pin No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
GPIO16/THERM
D1–/NTESTIN
RESETSTBY
RESETMAIN
3.3 V STBY
Mnemonic
D2+/A
D2–/A
+5.0 V
GPIO15
GPIO14
GPIO13
GPIO12
GPIO10
GPIO11
−12 V
+12 V
AGND
+V
PWM
V
V
DAC
D1+
A
A
A
A
A
A
A
A
INT
REF
BAT
IN7
IN6
IN5
IN4
IN3
IN2
IN1
IN0
CCP
IN9
IN8
IN
IN
IN
Programmable
Programmable
Analog Output
Analog Output
Power Supply
Digital Output
Digital Output
Digital Output
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
Analog Input
Analog Input
Digital I/O
Digital I/O
Digital I/O
Digital I/O
Digital I/O
Digital I/O
Digital I/O
Digital I/O
Ground
Type
†
†
†
†
†
†
†
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.
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.
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.
Ground pin for analog circuits.
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.
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.
Connected to the anode of the first remote temperature sensing diode.
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.
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.
Monitors battery voltage, nominally +3.0 V.
Monitors the +5.0 V supply.
Monitors the −12 V supply.
Monitors the +12 V supply.
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.
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).
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.
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Description