ADM1028ARQ ON Semiconductor, ADM1028ARQ Datasheet - Page 4

• Manufacturer Part Number: ADM1028ARQ
• Description: IC SENSOR TEMP/FAN CTRL 16QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1028ARQ

• Rohs Status: RoHS non-compliant
• Function: Fan Control, Temp Monitor
• Topology: ADC, 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: 16-QSOP

ADM1028
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
FAN_OFF
GPI
AUXRST
GND
V
RST
R_RST
FAN_SPD/NTEST_IN
D–
D+
THERMA/NTEST_OUT
THERMB
R_OFF
INT
SCL
SDA
CC3AUX
FAN_SPD/NTEST_IN
Description
Digital Output (Open Drain) Fan Off Request. When asserted low, this indicates a
request to shut off the fan independent of the FAN_SPD output. When negated (output
FET off) it indicates that the fan may be turned on.
Digital Input (12 V tolerant). This pin is a general-purpose logic input with 12 V toler-
ance. It can be programmed as an active high or active low input that sets Bit 4 of the
Interrupt Status Register. A voltage >2.2 V on this pin, represents a Logic “1,” while a
floating condition is interpreted as Logic “0.”
Digital Input. This pin can be driven low as an input to reset the ADM1028.
Ground. Power and signal ground.
Power 3.3 V Aux. Power source and voltage monitor input for power-on reset.
Digital Input. This pin can be pulled low externally to indicate to the ADM1028 that the
main system power has been removed. The ADM1028 will shut off the FAN_SPD out-
put and reset its R_OFF output.
Digital Output (Open Drain). This pin is a remote reset output that pulses low on
receipt of a specific SMBus message.
Analog Output/Test Input. An active-high input that enables NAND board-level
connectivity testing. Refer to section on NAND testing.
Used as an analog output for fan speed control when NAND test is not selected.
Remote Thermal Diode Negative Input. This is the negative input (current sink) from
the remote thermal diode. This also serves as the negative input into the A/D.
Remote Thermal Diode Positive Input. This is the positive input (current source) from
the remote thermal diode. This serves as the positive input into the A/D.
Digital Output (Open Drain with Integrated V
overload output that indicates a violation of a temperature setpoint (over temperature).
The fan is on full-speed whenever this pin is asserted low. Acts as the output of the NAND
Tree when the ADM1028 is in NAND Tree Test Mode.
Digital Output (Open Drain). This pin is a second THERM signal. It can be used to
drive external circuitry with a different external pull-up supply rail.
Digital Output or Open Drain with Integrated V
down) output. This pin is driven high on receipt of a specific SMBus message. The pin
(and its associated register bit) remain high until the RST input is asserted low.
Digital Output (Open Drain), System Interrupt Output. This signal indicates a violation
of a set trip point. The output is enabled when Bit 1 of the Configuration Register is set
to 1. The default state is disabled.
Digital Input. SMBus Clock.
Digital I/O (Open Drain). SMBus Bidirectional Data.
PIN FUNCTION DESCRIPTIONS
FAN_OFF
AUXRST
V
CC3AUX
R_RST
PIN CONFIGURATION
GND
RST
GPI
1
2
3
4
5
6
7
8
(Not to Scale)
ADM1028
TOP VIEW
–4–
16
15
14
13
12
11
10
9
SDA
SCL
INT
R_OFF
THERMB
D+
D–
THERMA/NTEST_OUT
CC3AUX
CC3AUX
Pull-Up). An active low thermal
Pull-Up. Remote off (power-
REV. B