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MAX6692MSA Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6692MSA Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 16 page  Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms _ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ _ 11 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 suffi- cient headroom (VCC = 2.8V 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 set to +85°C. • Local (internal) TLOW limit set to 0°C. • Remote (external) THIGH limit set to +85°C. • Remote (external) TLOW limit set to 0°C. • OVERT internal limit is set to +85°C; every external limit is set to +110°C (MAX6648). • OVERT limits are set to +85°C (MAX6692). Applications Information Remote-Diode Selection The MAX6648/MAX6692 can directly measure the die temperature of CPUs and other ICs that have on-board temperature-sensing diodes (see Typical Operating Circuit), or they can measure the temperature of a dis- crete diode-connected transistor. Effect of Ideality Factor The accuracy of the remote temperature measurements depends on the ideality factor (n) of the remote “diode” 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) 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) |
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