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ADT7460 Datasheet(PDF) 9 Page - ON Semiconductor |
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ADT7460 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 46 page ADT7460 http://onsemi.com 9 ADT7460 Address Selection Pin 8 is the dual−function PWM3/ADDRESS ENABLE pin. If Pin 8 is pulled low on powerup, the ADT7460 reads the state of Pin 9 (TACH4/ADDRESS SELECT/THERM) to determine the ADT7460’s slave address. If Pin 8 is high on powerup, the ADT7460 defaults to SMBus Slave Address 0x2E. This function is described in more detail later. Internal Registers of the ADT7460 Table 1 summarizes the ADT7460’s principal internal registers. Table 38 to Table 78 describe the registers in more detail. Table 1. Summary Internal Registers Register Description Configuration These registers provide control and configuration of the ADT7460, including alternate pinout functionality. Address Pointer This register contains the address that selects one of the other internal registers. When writing to the ADT7460, the first byte of data is always a register address, which is written to the address pointer register. Status Registers These registers provide the status of each limit comparison and are used to signal out−of−limit conditions on the temperature, voltage, or fan speed channels. If Pin 14 or Pin 5 is configured as SMBALERT, this pin asserts low whenever an unmasked status bit is set. Interrupt Mask These registers allow each interrupt status event to be masked when Pin 14 or Pin 5 is configured as an SMBALERT output. Value and Limit The results of analog voltage input, temperature, and fan speed measurements are stored in these registers, along with their limit values. Offset These registers allow each temperature channel reading to be offset by a twos complement value written to these registers. TMIN These registers program the starting temperature for each fan under automatic fan speed control. TRANGE These registers program the temperature−to−fan speed control slope in automatic fan speed control mode for each PWM output. Operating Point These registers define the target operating temperatures for each thermal zone when running under dynamic TMIN control. This function allows the cooling solution to adjust dynamically in response to measured temperature and system performance. Enhance Acoustics These registers allow each PWM output controlling fan to be tweaked to enhance the system’s acoustics. Theory of Operation Serial Bus Interface Control of the ADT7460 is carried out using the serial System Management Bus (SMBus). The ADT7460 is connected to this bus as a slave device, under the control of a master controller. The ADT7460 has a 7−bit serial bus address. When the device is powered up with Pin 8 (PWM3/ ADDRESS ENABLE) high, the ADT7460 has a default SMBus address of 0101110 or 0x2E. If more than one ADT7460 is to be used in a system, each ADT7460 should be placed in address select mode by strapping Pin 8 low on powerup. The logic state of Pin 9 then determines the device’s SMBus address. The logic state of these pins is sampled on powerup. The device address is sampled and latched on the first valid SMBus transaction, more precisely, on the low−to−high transition at the beginning of the eighth SCL pulse, when the serial address byte matches the selected slave address. The selected slave address is chosen using the ADDRESS ENABLE/ADDRESS SELECT pins. Any attempted changes in the address has no effect after this. Table 2. Address Select Mode Pin 8 State Pin 9 State Address 0 Low (10 k W to GND) 0101100 (0x2C) 0 High (10 k W pullup) 0101101 (0x2D) 1 Don’t Care 0101110 (0x2E) (default) Figure 13. Default SMBus Address 0x2E ADT7460 9 8 ADDR_SEL PWM3/ADDR_EN VCC 10kΩ ADDRESS = 0x2E Figure 14. SMBus Address 0x2C (Pin 9 = 0) ADT7460 9 8 ADDR_SEL PWM3/ADDR_EN 10k Ω ADDRESS = 0x2C |
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