MAX6652 19-1959 Rev 1 8/01 Temperature Sensor and System Monitor in a 10-Pin MAX General Description Features The MAX6652 system supervisor monitors multiple Monitors Four Voltages (2.5V, 3.3V, 12V, V ) CC power-supply voltages, including its own, and also fea- Monitors Local Temperature tures an on-board temperature sensor. Voltages and temperature are converted to an 8-bit code using an Temperature Measurement Accuracy, analog-to-digital converter (ADC). A multiplexer automat- 2C (T = +25C) A ically sequences through the voltage and temperature User-Programmable Voltage and Temperature measurements. The digitized signals are then stored in registers and compared to the over/under threshold lim- Thresholds its programmed over the 2-wire serial interface. Alert Function with Ability to Respond to SMB When a temperature measurement exceeds the pro- Alert Response Address grammed threshold, or when an input voltage falls out- +2.7V to +5.5V Supply Range side the programmed voltage limits, the MAX6652 generates a latched interrupt output ALERT. Three inter- -40C to +125C Temperature Range rupt modes are available for temperature excursions: 60Hz or 50Hz Line-Frequency Rejection default mode, one-time interrupt mode, and comparator mode. The ALERT output is cleared, except for tempera- Tiny 10-Pin MAX Package ture interrupts generated in comparator mode, by read- ing the interrupt status register (Table 5). The ALERT Applications output can also be masked by writing to the appropriate Workstations Networking bits in the interrupt mask register (Table 6) or by setting bit 1 of the configuration register (Table 4) to 0. The Servers Telecommunications 2 MAX6652 I C -compatible/SMBus interface also responds to the SMB alert response address. 2 The 2-wire serial interface accepts both I C and standard system management bus (SMBus) write byte, read byte, Ordering Information send byte, and receive byte commands to program the PART TEMP. RANGE PIN-PACKAGE alarm thresholds and to read voltage and temperature data. Voltage data is scaled so that when the nominal MAX6652AUB -40C to +125C 10 MAX voltage is present at a pin (e.g., 3.3V for the 3.3V pin), IN the conversion result is equal to 3/4 of the ADC full-scale range or a decimal count of 192 (Table 3). The tempera- ture data format is 7 bits plus sign, with each data bit Pin Configuration representing 1C, in two s complement format (Table 2). The MAX6652 has only one address pin, ADD. One of four different address codes can be selected by con- TOP VIEW necting the ADD pin to GND, V , SDA, or SCL. CC 2 Whenever an I C-compatible/SMBus transaction is initiat- 12V 1 10 V IN CC ed, the two LSBs of the slave address register are deter- 2.5V 2 9 SCL mined by connection, setting the chip address to one of IN MAX6652 four possible values. In addition, an address code can 3.3V 3 8 SDA IN also be directly written to the serial address register. This N.C. 4 7 ADD code will overwrite the code set by connection of the GND 5 6 ALERT ADD pin, until the MAX6652 is taken through a power-on reset cycle. MAX The MAX6652 features 60Hz or 50Hz line-frequency rejection for optimal performance. The device operates from +2.7V to +5.5V and is specified for operation from -40C to +125C. It is available in a tiny 10-pin MAX package. Typical Application Circuit and Functional Diagram appear at end of data sheet. 2 I C is a trademark of Philips Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Temperature Sensor and System Monitor in a 10-Pin MAX ABSOLUTE MAXIMUM RATINGS All Voltages Are Referenced to GND V ........................................................................-0.3V to +6.0V Operating Temperature Range ........................-40C to +125C CC Voltage on 12V ...................................................-0.3V to +16V Storage Temperature Range ............................-65C to +150C IN All Other Pins ........................................................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) A Output Current (SDA, ALERT) ............................-1mA to +50mA 10-Pin MAX (derate 5.6mW/C above +70C) ..........444mW Junction Temperature .....................................................+150C Lead Temperature (soldering, 10s) ................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (T = -40C to +125C, unless otherwise noted. Typical values are at V = +5V, T = +25C.) A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLY Supply Voltage V 2.7 5.5 V CC I Active 200 500 A CC Supply Current Shutdown mode, all digital inputs are I <1 10 A SD grounded Power-On Reset Voltage V rising or falling edge 2 V CC TEMPERATURE T = +25C2 A Accuracy (Note 5) V = +5V -20C T +80C3 C CC A -40C T +125C5 A PSRR V = +2.7V to +5.5V 0.7 1.3 C/V CC Resolution 1 C ADC CHARACTERISTICS Total Unadjusted Error TUE V > 10LSB 1 1.5 % IN Differential Nonlinearity DNL V > 10LSB 1 LSB IN Supply Sensitivity PSS V = +2.7V to +5.5V 1 V CC Input Resistance R 12V , 2.5V , 3.3V 100 150 200 k IN IN IN IN Total Monitoring Cycle Time tc (Note 1) 200 300 ms SCL, SDA, ADD Logic Input Low Voltage V 0.8 V IL V 3.6V 2.0 V CC Logic Input High Voltage V IH V > 3.6V 2.6 V CC SDA Output Low Voltage V I = 3mA 400 mV OL SINK Input Leakage Current I V = 0 or 5V 1 A LEAK IN ALERT I = 1.2mA, V > 2.7V 0.3 V SINK CC Output Low Voltage V OLA I = 3.2mA, V > 4.5V 0.4 V SINK CC TIMING Serial Clock Frequency f 0 400 kHz SCL Bus Free Time Between STOP and t 1.3 s BUF START 2 MAX6652