ADM1034
FUNCTIONAL DESCRIPTION
V
CC
The ADM1034 is a local- and remote-temperature 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
ADM1034
R1
PIN 13
LOCATION
R2
GND
fans stalls, the device asserts a
output.
FAN_FAULT
Figure 16. Bootstrapping the LOCATION Input
SMBus 2.0 ARP-°APABLE MODE
The ADM1034 features a
I/O. As an input, this
THERM
In ARP-capable mode, the ADM1034 supports features 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.
measures assertions on the
pin. As an output, it asserts
THERM
a low signal to indicate when the measured temperature exceeds
the programmed temperature. The ADM1034
THERM
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).
V
CC
ARP
LOCATION = 111
ADM1034 NO. 1
ADM1034 NO. 2
ADM1034 NO. 3
ADM1034 NO. 4
ADM1034 NO. 5
ADM1034 NO. 6
ADM1034 NO. 7
ADM1034 NO. 8
1.5kΩ
INTERNAL REGISTERS
ARP
LOCATION = 110
1kΩ
1kΩ
1kΩ
1kΩ
1kΩ
1.5kΩ
Table 4 gives a brief description of the ADM1034’s principal
internal registers. For more detailed information on the
function of each register, refer to Table 34.
ARP
LOCATION = 101
ARP
LOCATION = 100
SERIAL BUS INTERFA°E
FD
ADDRESS = 53h
The ADM1034 communicates with the master via the 2-wire
SMBus 2.0 interface. It supports two versions of SMBus 2.0,
determined by the value of the LOCATION input’s resistors.
FD
ADDRESS = 52h
FD
ADDRESS = 51h
The first version is fully ARP-capable. This means that it
supports address resolution protocol (ARP), allowing the
master to dynamically address the device on power-up. It
responds to ARP commands such as “Prepare to ARP.”
FD
ADDRESS = 50h
GND
Figure 17. Setting Up Multiple ADM1034 Addresses in
SMBus 2.0 ARP-Capable Mode
The second SMBus version, fixed-and-discoverable, is
backwards-compatible with SMBus 1.0 and 1.1. In this mode,
the ADM1034 powers up with a fixed address, which is
determined by the state of the LOCATION pin on power-up.
Note: When using the ADM1034, Addresses 0xC2 and 0xCA
should not be used by any other device on the bus.
In SMBus 2.0 mode, this vendor-specific ID is generated by an
on-chip random number generator. This should enable two
adjacent ADM1034s in the same system to power up with a
different vendor-specific ID, allowing the master to identify the
two separate ADM1034s and assign a different address to each.
The state of the LOCATION input on power-up is also reflected
in the UDID. This is useful when there is more than one
ADM1034 in the system, so the master knows which one it is
communicating with. The complete UDID is listed in Table 6.
LO°ATION INPUT
The LOCATION input is a resistor divider input. It has 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).
The SMBus 2.0 master issues both general and directed ARP
commands. A general command is directed at all ARP devices.
A directed command is targeted at a single device once an
address has been established. The PEC byte must be used for
ARP commands. (Refer to the Packet Error Checking (PEC)
section.) The ADM1034 responds to the following commands:
The voltage of this 8-level input is set by a potential divider. The
voltage on LOCATION is sampled on power-up and digitized
by the on-chip ADC to determine the LOCATION input value.
Because the LOCATION input is sampled only at power-up,
changes made while power is applied have no effect.
•
•
•
•
Prepare to ARP (general)
Reset device (general and directed)
Get UDID (general and directed)
Assign address (general)
Rev. 0 | Page 10 of 40
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