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ADT7473 Datasheet(PDF) 8 Page - ON Semiconductor |
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ADT7473 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 73 page ADT7473 www.onsemi.com 8 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 Feature ADT7473 ADT7473−1 Pin 5 Default: PWM2 Default: THERM_LATCH SMBus Address Fixed Address Address selectable Remote Ch. 2 Therm Limit = 100 °C = 136 °C Register 0x30, 0x31, 0x32 Default: 0x00 Default: 0xFF Register 0x3F Revision Reg Default: 0x68 Default: 0x69 Register 0x40, Bit 7 Reserved (R/W) 1 = Reset Latch (Lockable) Register 0x42, Bit 0 Reserved (Read-only) 1 = THERM Limit Latched Registers 0x5C, 0x5D, 0x5E Default: 0x82 Default: 0x62 Register 0x7C, Bit 4 Reserved THERM Output Hysteresis Register 0x7D, Bit 4 Reserved THERM_LATCH Configuration 0=Remote Channel 2 1=Remote Channel 1 and Remote Channel 2 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. • 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. • Bit 0 of Configuration Register 1 (0x40) remains writable after the lock bit is set. This bit enables monitoring. • 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 Bit 0 Bit 1 Function 0 0 TACH4 0 1 THERM 1 0 GPIO 1 1 SMBALERT 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. • VCC 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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