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ADT7473
Product Description
The ADT7473/ADT7473 ? 1 is a complete thermal
monitor and multiple fan controller for any system requiring
thermal monitoring and cooling. The device communicates
with the system via a serial system management bus. The
serial bus controller has a serial data line for reading and
writing addresses and data (Pin 16), and an input line for the
serial clock (Pin 1). All control and programming functions
for the ADT7473/ADT7473 ? 1 are performed over the serial
bus. Additionally, a pin can be reconfigured as an
SMBALERT output to signal out-of-limit conditions.
Table 5 illustrates the differences between the ADT7473
and the ADT7473 ? 1.
Table 5. ADT7473/ADT7473 ? 1 DEVICE COMPARISON
? A high frequency PWM drive can be independently
selected for each PWM channel on the
ADT7473/ADT7473 ? 1. This is not available on the
ADT7467.
? The range and resolution of the temperature offset
register can be changed from a ? 64 ? C range at 0.5 ? C
resolution to a ? 128 ? C range at 1 ? C resolution. This is
not available on the ADT7467.
? THERM overtemperature events can be
disabled/enabled individually on each temperature
channel. This is not available on the ADT7467.
? Bit 7 of Configuration Register 1 is no longer supported
because the ADT7473/ADT7473 ? 1 cannot be powered
via a 5.0 V supply.
Feature
Pin 5
ADT7473
Default: PWM2
ADT7473 ? 1
Default:
THERM_LATCH
?
Bit 0 of Configuration Register 1 (0x40) remains
writable after the lock bit is set. This bit enables
monitoring.
SMBus Address
Remote Ch. 2
Therm Limit
Register 0x30,
0x31, 0x32
Register 0x3F
Revision Reg
Register 0x40,
Bit 7
Fixed Address
= 100 ? C
Default: 0x00
Default: 0x68
Reserved
Address
selectable
= 136 ? C
Default: 0xFF
Default: 0x69
(R/W) 1 = Reset
Latch (Lockable)
? 2-wire fan speed measurement is not supported on the
ADT7473/ADT7473 ? 1.
How to Set the Functionality of Pin 9
Pin 9 on the ADT7473/ADT7473 ? 1 has four possible
functions: SMBALERT, THERM, GPIO, and TACH4. The
user chooses the required functionality by setting Bit 0 and
Bit 1 of Configuration Register 4 (0x7D).
Table 6. PIN 9 SETTINGS
Register 0x42,
Bit 0
Registers 0x5C,
0x5D, 0x5E
Register 0x7C,
Bit 4
Reserved
Default: 0x82
Reserved
(Read-only)
1 = THERM
Limit Latched
Default: 0x62
THERM Output
Hysteresis
Bit 0
0
0
1
1
Bit 1
0
1
0
1
Function
TACH4
THERM
SMBALERT
GPIO
Register 0x7D,
Bit 4
Reserved
THERM_LATCH
Configuration
0 = Remote
Channel 2
1 = Remote
Channel 1
and Remote
Channel 2
Recommended Implementation
Configuring the ADT7473 as shown in Figure 12 allows
the system designer to use the following features:
? Two PWM outputs for fan control of up to three fans.
(The front and rear chassis fans are connected in
parallel.)
? Three TACH fan speed measurement inputs.
Comparison Between ADT7467 and
ADT7473/ADT7473 ? 1
The following list shows some comparisons between the
ADT7467 and the ADT7473/ADT7473 ? 1:
? The ADT7473/ADT7473 ? 1 can be powered via a
3.3 V supply only, and does not support 5.0 V
operation, while the ADT7467 does. Violating this
specification results in irreversible damage to the
ADT7473/ADT7473 ? 1. See the Specifications section
for more information.
? V CC measured internally through Pin 3.
? CPU temperature measured using Remote 1
temperature channel.
? Ambient temperature measured through Remote 2
temperature channel.
? Bidirectional THERM pin. This feature allows
Intel ? Pentium ? 4 PROCHOT monitoring and can
function as an overtemperature THERM output. It can
alternatively be programmed as an SMBALERT system
interrupt output.
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