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MAX6649MUA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6649MUA Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page +145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms ______________________________________________________________________________________ 11 Slave Addresses The MAX6646/MAX6647/MAX6649 have fixed slave addresses (see Table 9). All devices also respond to the SMBus alert response slave address (see the Alert Response Address section). POR and UVLO To prevent ambiguous power-supply conditions from corrupting the data in memory and causing erratic behavior, a POR voltage detector monitors VCC and clears the memory if VCC falls below 2.0V (typ). When power is first applied and VCC rises above 2.0V (typ), the logic blocks begin operating, although reads and writes at VCC levels below 3V are not recommended. A second VCC comparator, the ADC UVLO comparator, prevents the ADC from converting until there is sufficient headroom (VCC = 2.7V typ). Power-Up Defaults Power-up defaults include: • Interrupt latch is cleared. • ADC begins autoconverting at a 4Hz rate. • Command byte is set to 00h to facilitate quick local temperature receive byte queries. • Local (internal) THIGH limit is set to +85°C. • Local (internal) TLOW limit is set to 0°C. • Remote (external) THIGH limit is set to +85°C (MAX6649)/+95°C (MAX6646/MAX6647) • OVERT (internal) limit is set to +85°C • OVERT (external) limit is set to +85°C (MAX6649)/ +125°C (MAX6646/MAX6647) DATA CONVERSION RATE (Hz) 00h 0.0625 01h 0.125 02h 0.25 03h 0.5 04h 1 05h 2 06h 4 07h 4 08h-FFh Reserved Table 8. Conversion-Rate Control Byte (04h) BIT NAME POR STATE FUNCTION 7 (MSB) BUSY 0 A/D is busy converting when 1. 6 LHIGH 0 Local (internal) high-temperature alarm has tripped when 1; cleared by POR or readout of the status byte if the fault condition no longer exists. 5 LLOW 0 Local (internal) low-temperature alarm has tripped when 1; cleared by POR or readout of the status byte if the fault condition no longer exists. 4 RHIGH 0 Remote (external) high-temperature alarm has tripped when 1; cleared by POR or readout of the status byte if the fault condition no longer exists. 3 RLOW 0 Remote (external) low-temperature alarm has tripped when 1; cleared by POR or readout of the status byte if the fault condition no longer exists. 2 FAULT 0 A 1 indicates DXN and DXP are either shorted or open; cleared by POR or readout of the status byte if the fault condition no longer exists. 1 EOT 0 A 1 indicates the remote (external) junction temperature exceeds the external OVERT threshold. 0 IOT 0 A 1 indicates the local (internal) junction temperature exceeds the internal OVERT threshold. Table 7. Status Register Bit Assignments (02h) PART SLAVE ADDRESS MAX6646 1001 101 MAX6647 1001 110 MAX6649 1001 100 Table 9. Slave Addresses |
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