MAX6581

The MAX6581 is specified for an operating temperature range of -40°C to +125°C and is available in a 24-pin, 4mm x 4mm thin QFN package with an exposed pad. All temperature channels have programmable alert and overtemperature thresholds. The MAX6581 precision multichannel temperature sensor monitors its own temperature and the temperatures of up to seven external diode-connected transistors. When the measured temperature of a channel crosses the respective threshold, a status bit is set in one of the status registers. Two open-drain alarm outputs (ALERT and OVERT)assert corresponding to these bits in the status register(s). Resistance cancellation is available for all channels and compensates for high series resistance in circuit-board traces and thermal diodes. The 2-wire serial interface of MAX6581 accepts SMBus protocols (write byte, read byte, send byte, and receive byte)for reading the temperature data and programming the alarm thresholds.

The features of MAX6581 can be summarized as (1)eight channels to measure seven remote and one local temperature; (2)11-Bit, 0.125°C resolution; (3)high accuracy of ±1°C (max)from +60°C to +100°C (remote channels); (4)-64°C to +150°C remote temperature range; (5)programmable undertemperature/ overtemperature alerts; (6)SMBus/I2C-compatible interface; (7)two open-drain alarm outputs (ALERT and OVERT); (8)resistance cancellation on all remote channels.

The absolute maximum ratings of MAX6581 are (1)VCC, SMBCLK, SMBDATA, ALERT, OVERT, STBY to GND: -0.3V to +4V; (2)DXP_ to GND: -0.3V to (VCC + 0.3V); (3)DXN_ to GND: -0.3V to (VCC + 0.3V); (4)SMBDATA, ALERT, OVERT current: -1mA to +50mA; (5)DXN_ current: Q1mA; (6)continuous power dissipation (TA = +70°C)24-Pin Thin QFN (derate 27.8mW/°C above +70°C): 2222mW; (7)package junction-to-ambient thermal resistance (JA): 36.0°C/W; (8)package junction-to-case thermal resistance (JC): 3.0°C/W; (9)ESD protection (all pins, human body model): Q2kV; (10)operating temperature range: -40°C to +125°C; (11)junction temperature: +150°C; (12)storage temperature range: -65°C to +150°C; (13)lead temperature (soldering, 10s): +300°C; (14)soldering temperature (reflow): +260°C.