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MAX6689EP38 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6689EP38 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 19 page ALERT Response Address The SMBus alert response interrupt pointer provides quick fault identification for simple slave devices that lack the complex logic needed to be a bus master. Upon receiving an interrupt signal, the host master can broadcast a receive byte transmission to the alert response slave address (see the Slave Addresses sec- tion). Then, any slave device that generated an inter- rupt attempts to identify itself by putting its own address on the bus. The alert response can activate several different slave devices simultaneously, similar to the I2C* General Call. If more than one slave attempts to respond, bus arbitra- tion rules apply, and the device with the lower address code wins. The losing device does not generate an acknowledgment and continues to hold the ALERT line low until cleared. (The conditions for clearing an alert vary depending on the type of slave device.) Successful completion of the alert response protocol clears the output latch. If the condition that caused the alert still exists, the MAX6689 reasserts the ALERT interrupt at the end of the next conversion. OVERT Overtemperature Alarms The MAX6689 has four overtemperature registers that store remote alarm threshold data for the OVERT output. OVERT is asserted when a channel’s measured temper- ature is greater than the value stored in the correspond- ing threshold register. OVERT remains asserted until the temperature drops below the programmed threshold minus 4°C hysteresis. An overtemperature output can be used to activate a cooling fan, send a warning, initi- ate clock throttling, or trigger a system shutdown to pre- vent component damage. See Table 3 for the POR state of the overtemperature threshold registers. Command Byte Functions The 8-bit command byte register (Table 3) is the master index that points to the various other registers within the MAX6689. This register’s POR state is 0000 0000. Configuration Byte Functions There are three read-write configuration registers (Tables 4, 5, and 6) that can be used to control the MAX6689’s operation. Configuration 1 Register The configuration 1 register (Table 4) has several func- tions. Bit 7 (MSB) is used to put the MAX6689 either in software standby mode (STOP) or continuous conver- sion mode. Bit 6 resets all registers to their power-on reset conditions and then clears itself. Bit 5 disables the SMBus timeout. Bit 4 enables more frequent con- versions on channel 1, as described in the ADC Conversion Sequence section. Bit 3 enables resistance cancellation on channel 1. See the Series Resistance Cancellation section for more details. The remaining bits of the configuration 1 register are not used. The POR state of this register is 0000 0000 (00h). Configuration 2 Register The configuration 2 register functions are described in Table 5. Bits [6:0] are used to mask the ALERT interrupt output. Bit 6 masks the local alert interrupt and bits 5 through bit 0 mask the remote alert interrupts. The power-up state of this register is 0000 0000 (00h). Configuration 3 Register Table 6 describes the configuration 3 register. Bits 5, 4, 3, and 0 mask the OVERT interrupt output for channels 6, 5, 4, and 1. The remaining bits, 7, 6, 2, and 1, are reserved. The power-up state of this register is 0000 0000 (00h). Status Register Functions Status registers 1, 2, and 3 (Tables 7, 8, and 9) indicate which (if any) temperature thresholds have been exceeded and if there is an open-circuit or short-circuit fault detected with the external sense junctions. Status register 1 indicates if the measured temperature has exceeded the threshold limit set in the ALERT registers for the local or remote-sensing diodes. Status register 2 indicates if the measured temperature has exceeded the threshold limit set in the OVERT registers. Status register 3 indicates if there is a diode fault (open or short) in any of the remote-sensing channels. Bits in the alert status register clear by a successful read, but set again after the next conversion unless the fault is corrected, either by a drop in the measured tem- perature or an increase in the threshold temperature. The ALERT interrupt output follows the status flag bit. Once the ALERT output is asserted, it can be deasserted by either reading status register 1 or by successfully responding to an alert response address. 7-Channel Precision Temperature Monitor 10 ______________________________________________________________________________________ *Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these com- ponents in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. |
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