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MAX6646 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6646 Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 16 page +145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms Detailed Description The MAX6646/MAX6647/MAX6649 are temperature sen- sors designed to work in conjunction with a microproces- sor or other intelligence in thermostatic, process-control, or monitoring applications. Communication with the MAX6646/MAX6647/MAX6649 occurs through the SMBus-compatible serial interface and dedicated alert and overtemperature outputs. ALERT asserts if the mea- sured local or remote temperature is greater than the software-programmed ALERT high limit or less than the ALERT low limit in the MAX6649. ALERT also asserts, in the MAX6649, if the remote-sensing diode pins are short- ed or unconnected. The overtemperature alarm, OVERT, asserts if the software-programmed OVERT limit is exceeded. OVERT can be connected to fans, a system shutdown, a clock throttle control, or other thermal-man- agement circuitry. The MAX6646/MAX6647/MAX6649 convert temperatures to digital data either at a programmed rate or in single conversions. Temperature data is represented as 11 bits, with the LSB equal to 0.125°C. The “main” temperature data registers (at addresses 00h and 01h) are 8-bit regis- ters that represent the data as 8 bits with the full-scale reading indicating the diode fault status (Table 1). The remaining 3 bits of temperature data are available in the “extended” registers at addresses 11h and 10h (Table 2). ADC and Multiplexer The averaging ADC integrates over a 60ms period (each channel, typically), with excellent noise rejection. The multiplexer automatically steers bias currents through the remote and local diodes. The ADC and associated circuitry measure each diode’s forward volt- age and compute the temperature based on this volt- age. Both channels are automatically converted once the conversion process has started, either in free-run- ning or single-shot mode. If one of the two channels is not used, the device still performs both measurements, and the results of the unused channel can be ignored. If the remote-diode channel is unused, connect DXP to DXN rather than leaving the inputs open. Pin Description PIN NAME FUNCTION 1 VCC Supply Voltage Input, 3V to 5.5V. Bypass VCC to GND with a 0.1μF capacitor. A 200 series resistor is recommended but not required for additional noise filtering. 2 DXP Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode Channel. DO NOT LEAVE DXP UNCONNECTED; connect DXP to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for noise filtering. 3 DXN Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally connected to ground. 4 OVERT Overtemperature Alert/Interrupt Output, Open Drain. OVERT is logic low when the temperature is above the software-programmed threshold. 5 GND Ground 6 ALERT SMBus Alert (Interrupt) Output, Open Drain. ALERT asserts when temperature exceeds limits (high or low temperature). ALERT stays asserted until acknowledged by either reading the status register or by successfully responding to an alert response address, provided that the fault condition no longer exists. See the ALERT Interrupts section. 7 SDA SMBus Serial-Data Input/Output, Open Drain 8 SCLK SMBus Serial-Clock Input 5 TEMP ( °C) DIGITAL OUTPUT +145 1001 0001 +130 1000 0010 +128 1000 0000 +25 0001 1001 0 0000 0000 <0 0000 0000 Diode fault (short or open) 1111 1111 Table 1. Main Temperature Data Register Format (00h, 01h) |
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