ADM1034ARQZ-R7 ON Semiconductor, ADM1034ARQZ-R7 Datasheet - Page 8

• Manufacturer Part Number: ADM1034ARQZ-R7
• Description: IC THERM/FAN SPEED CTLR 16-QSOP
• Manufacturer: ON Semiconductor

Specifications of ADM1034ARQZ-R7

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
monitor and fan controller for use in a variety of
applications, including microprocessor−based systems. The
device accurately monitors remote and ambient temperature
and uses that information to quietly control the speed of a
cooling fan. Whenever one of the fans stalls, the device
asserts a FAN_FAULT output.
measures assertions on the THERM pin. As an output, it
asserts a low signal to indicate when the measured
temperature
temperature. The ADM1034 communicates over an SMBus
2.0 interface. Its LOCATION input determines which
version of SMBus to use, as well as the SMBus address (in
fixed and discoverable mode) and the LOCATION bits in
the UDID (in ARP−capable mode).
Internal Registers
principal internal registers. For more detailed information
on the function of each register, refer to Table 31.
Serial Bus Interface
2−wire SMBus 2.0 interface. It supports two versions of
SMBus 2.0, determined by the value of the LOCATION
input’s resistors.
supports address resolution protocol (ARP), allowing the
master to dynamically address the device on powerup. It
responds to ARP commands such as “Prepare to ARP.”
backwards compatible with SMBus 1.0 and 1.1. In this mode,
The ADM1034 is a local− and remote−temperature
The ADM1034 features a THERM I/O. As an input, this
Table 1 gives a brief description of the ADM1034’s
The ADM1034 communicates with the master via the
The first version is fully ARP−capable. This means that it
The second SMBus version, fixed and discoverable, is
Figure 13. Supply Current vs. Conversion Rate
1200
1000
800
600
400
200
0
0.01
DEV 33
exceeds
0.1
CONVERSION RATE (Hz)
DEV 31
DEV 32
the
1
programmed
10
TYPICAL CHARACTERISTICS
THERM
http://onsemi.com
100
8
the ADM1034 powers up with a fixed address, which is
determined by the state of the LOCATION pin on powerup.
NOTE: When using the ADM1034, Addresses 0xC2 and
0xCA should not be used by any other device on the bus.
Location Input
multiple functions and can specify the SMBus version (in
fixed and discoverable or ARP−capable modes); the SMBus
address (in fixed and discoverable mode); and the LLL bits
(in UDID in ARP−capable mode).
divider. The voltage on LOCATION is sampled on powerup
and digitized by the on−chip ADC to determine the
LOCATION input value. Because the LOCATION input is
sampled only at powerup, changes made while power is
applied have no effect.
SMBus 2.0 ARP−Capable Mode
such as address resolution protocol (ARP) and unique
device identifier (UDID). The UDID is a 128−bit message
that describes the ADM1034’s capabilities to the master.
The UDID also includes a vendor specific ID for
functionally equivalent devices.
The LOCATION input is a resistor divider input. It has
The voltage of this 8−level input is set by a potential
In ARP−capable mode, the ADM1034 supports features
Figure 15. Bootstrapping the LOCATION Input
1.55
1.50
1.45
1.40
1.35
1.30
1.25
–60
Figure 14. Supply Current vs.
–40
R1
R2
ADM1034 Temperature
V
GND
CC
–20
PIN 13
TEMPERATURE (°C)
0
ADM1034
LOCATION
20
40
60
80
100