ADM1033

http://onsemi.com

3

ABSOLUTE MAXIMUM RATINGS

Parameter

Rating

Unit

−0.3, +6.5

V

Voltage on Any Input or Output Pin except FAN_FAULT and LOCATION

V

Voltage on FAN_FAULT (Note 1)

Voltage on LOCATION

V

Input Current at Any Pin

±20

mA

150

°C

Storage Temperature Range

−65 to +150

°C

Lead Temperature, Soldering (10 s)

300

°C

IR Reflow Peak Temperature

220

°C

ESD Rating − All Pins

1500

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

NOTE: This device is ESD sensitive. Use standard ESD precautions when handling.

THERMAL CHARACTERISTICS

Parameter

Rating

16−Lead QSOP Package

PIN ASSIGNMENT

Pin No.

Mnemonic

Description

1

DRIVE1

DRIVE1 Pin Drives Fan 1. Open−drain output. Requires a pullup resistor.

2

TACH1

Fan 1 Fan Speed Measurement Input. Connects to the fan’s TACH output to measure the fan speed.

3

ALERT Comp

Open−Drain Active Low Output. Assets low whenever a measurement goes outside its programmed

limits if not masked. Automatically goes high again when the measured parameter falls back within

its limits.

4

NC

No Connect.

5

GND

Ground for Analog and Digital Circuitry.

6

VCC

Power. Can be powered by 3.3 V standby power if monitoring in low power states is required.

7

THERM

Can be configured as an overtemperature interrupt output, or as an input (to monitor PROCHOT

output of an INTEL CPU). A timer measures assertion times on the THERM pin (either input or output).

8

FAN_FAULT/REF

FAN_FAULT: Open−Drain Output. Asserted low when one or both fans stall. Requires a pullup

9

D1−

Cathode Connection for the First Thermal Diode or Diode−Connected Transistor.

10

D1+

Anode Connection for the First Thermal Diode or Diode−Connected Transistor.

11

NC

No Connect.

12

NC

No Connect.

13

LOCATION

8−Level Analog Input. Used to determine the correct SMBus version and the SMBus address (in

fixed and discoverable mode) and to set the LLL bits in the UDID (in ARP−capable mode).

14

ALERT

Open−Drain Output. SMBusALERT pin. Alerts the system in the case of out−of−limit events, such as

over temperature. Can be configured as sticky SMBus mode or comparator mode.

15

SDA

Serial Bus Bidirectional Data. Connects to the SMBus master’s data line. Requires pullup resistor if

not provided elsewhere in the system.

16

SCL

Serial SMBus Clock Input. Connects to the SMBus master’s clock line. Requires pullup resistor if not

already provided in the system.