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MAX6642ATT9A Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6642ATT9A Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page the ALERT is cleared by responding to the alert response address and the temperature fault condition still exists, ALERT is reasserted after the next tempera- ture-monitoring cycle. To clear ALERT while the tempera- ture is above the trip threshold, write a new high limit that is higher than the current temperature. The ALERT out- put is open drain, allowing multiple devices to share a common interrupt line. Alert Response Address The SMBus alert response interrupt pointer provides quick fault identification for simple slave devices like temperature sensors. Upon receiving an ALERT inter- rupt 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 that generated an interrupt 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- ±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm 8 _______________________________________________________________________________________ ADDRESS POR STATEFUNCTION 00h 00h (0000 0000) Read local temperature 01h 00h (0000 0000) Read remote temperature 02h N/A Read status byte 03h 10h (0001 0000) Read configuration byte 05h 46h (0100 0110) +70 °C Read local high limit 07h 78h (0111 1000) +120 °C Read remote high limit 09h N/A Write configuration byte 0Bh N/A Write local high limit 0DhN/A Write remote high limit 0Fh N/A Single shot 10h 0000 0000 Read remote extended temperature 11h 0000 0000 Read internal extended temperature FEh4Dh (0100 1101) Read manufacturer ID Table 3. Command-Byte Assignments BIT NAME POR STATE FUNCTION 7 (MSB) MASK1 0 A 1 masks off (disables) the ALERT interrupts. 6 STOP/RUN 0 A 1 puts the MAX6642 into standby mode. 5 External only 0 A 1 disables local temperature measurements so that only remote temperature is measured. The measurement rate becomes 8Hz. 4 Fault queue 1 0: ALERT is set by a single fault. 1: Two consecutive faults are required to set ALERT. 3 to 0 — 0000 Reserved. Table 4. Configuration-Byte Bit Assignments BIT NAME POR STATE FUNCTION 7 (MSB) BUSY 0 A 1 indicates the MAX6642 is busy converting. 6 LHIGH 0 A 1 indicates an internal high-temperature fault. Clear LHIGH with a POR or by reading the status byte. 5 — 0 Reserved. 4 RHIGH 0 A 1 indicates an external high-temperature fault. Clear RHIGH with a POR or by reading the status byte. 3 — 0 Reserved. 2 OPEN 0 A 1 indicates a diode open condition. Clear OPEN with a POR or by reading the status byte when the condition no longer exists. 1 to 0 — 0 Reserved. Table 5. Status-Byte Bit Assignments |
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