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MAX6638ATE+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6638ATE+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page lack the complex logic needed to be a bus master. Upon receiving an ALERT_ interrupt signal, the host master can broadcast a receive-byte transmission to the alert-response slave address (0001 100). Following such a broadcast, any slave device generating an interrupt attempts to identify itself by putting its own address on the bus. The alert response can activate several different slave devices simultaneously. If more than one slave attempts to respond, bus arbitration rules apply, and the device with the lower address code wins. The los- ing device does not generate an acknowledge response and continues to hold the ALERT_ line low until cleared. Successful completion of the read alert- response protocol clears the interrupt latch, provided the condition that caused the alert no longer exists. Overtemperature Limit Output OVERT1 asserts when the temperature rises to a value stored in one of the OVERT1 limit registers (19h and 20h). It deasserts when the temperature drops below the stored limit, minus hysteresis. OVERT1 can be used to activate a cooling fan, send a warning, invoke clock throttling, or trigger a system shutdown to prevent com- ponent damage. Command-Byte Functions The 8-bit command-byte register (Table 3) is the mas- ter index that points to the various other registers within the MAX6638. The register’s POR state is 0000 0000, so a receive-byte transmission (a protocol that lacks the command byte) that occurs immediately after POR returns the current local-temperature data. One-Shot Conversion Cycle The one-shot command immediately forces a new con- version cycle to begin. If the MAX6638 receives a one- shot command while the MAX6638 is in standby mode (RUN = 1), a new conversion begins, after which the device returns to standby mode. If during a conversion the MAX6638 receives a one-shot command, the MAX6638 ignores the command; however, the results of the conversion in progress update the data registers accordingly. Configuration-Byte Functions The configuration-byte register (Tables 3 and 5) is a read-write register with several functions. Bit 7 masks interrupts. Bit 6 puts the MAX6638 into a standby (STOP) mode or autonomous (RUN) mode. The MAX6638 enters standby mode when both SMBus controllers set the cor- responding configuration bits. Status-Byte Functions The status-byte register (Tables 3 and 4) indicates when any temperature threshold is exceeded. This byte also indicates whether the ADC is converting and if there is a fault detected in the external sense diode. After POR, the state of the flag bits are zero, assuming no alarm conditions are present. The status byte clears with any successful read of the status byte, after com- pletion of a conversion and if the fault condition no longer exists. Note that the ALERT_ interrupt latch does not automatically clear when the status-flag bit indicat- ing the ALERT_ clears. Registers The internal registers of the MAX6638 are all 8-bit data word width and are all accessible through SMBus by read and write operations. Temperature Monitor with Dual Serial Interface ______________________________________________________________________________________ 11 |
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